U.S. patent application number 17/445187 was filed with the patent office on 2021-12-30 for method for determining rank information.
The applicant listed for this patent is XI'AN ZHONGXING NEW SOFTWARE CO., LTD.. Invention is credited to Yuhong GONG, Chuangxin JIANG, YuNgok LI, Zhaohua LU, Meng MEI, Shujuan ZHANG.
Application Number | 20210409080 17/445187 |
Document ID | / |
Family ID | 1000005827924 |
Filed Date | 2021-12-30 |
United States Patent
Application |
20210409080 |
Kind Code |
A1 |
ZHANG; Shujuan ; et
al. |
December 30, 2021 |
METHOD FOR DETERMINING RANK INFORMATION
Abstract
Provided are a method and device for feeding back and receiving
channel information. The method comprises: determining a candidate
resource set, selecting M resources from the candidate resource
set, and transmitting at least one of indication information or
channel state information of the selected M resources to a first
communication node, where M is a positive integer; a selection
criterion for selecting the M resources from the candidate resource
set is determined in at least one of following manners: a selection
criterion or a selection criterion set is agreed with the first
communication node, and a selection criterion or a selection
criterion set is obtained according to received indication
information transmitted by the first communication node, and the
selection criterion set comprises at least one selection
criterion.
Inventors: |
ZHANG; Shujuan; (Shenzhen,,
CN) ; LU; Zhaohua; (Shenzhen, CN) ; LI;
YuNgok; (Shenzhen, CN) ; MEI; Meng; (Shenzhen,
CN) ; GONG; Yuhong; (Shenzhen, CN) ; JIANG;
Chuangxin; (Shenzhen, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
XI'AN ZHONGXING NEW SOFTWARE CO., LTD. |
XI'AN |
|
CN |
|
|
Family ID: |
1000005827924 |
Appl. No.: |
17/445187 |
Filed: |
August 16, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16484094 |
Aug 6, 2019 |
11095343 |
|
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PCT/CN2018/071654 |
Jan 5, 2018 |
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17445187 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04B 7/0626 20130101;
H04B 7/0486 20130101; H04B 7/0617 20130101; H04L 5/0051 20130101;
H04B 7/0417 20130101; H04B 7/0632 20130101 |
International
Class: |
H04B 7/0417 20060101
H04B007/0417; H04B 7/0456 20060101 H04B007/0456; H04B 7/06 20060101
H04B007/06; H04L 5/00 20060101 H04L005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 6, 2017 |
CN |
201710067275.0 |
Claims
1. A method for feeding back channel information, comprising:
transmitting first feedback information; and determining, according
to a relationship between elements in the first feedback
information and a predetermined threshold, a number of elements in
second feedback information.
2. The method according to claim 1, further comprising: in response
to determining that the number of elements in the second feedback
information is larger than 0, transmitting the second feedback
information.
3. The method according to claim 1, wherein determining the number
of elements in the second feedback information according to the
relationship between the elements in the first feedback information
and the predetermined threshold comprises: determining the number
of elements in the second feedback information corresponding to
each layer according to a number of elements with a value greater
than the predetermined threshold in the first feedback information
corresponding to the layer, wherein the number of elements with the
value greater than the predetermined threshold in the first
feedback information corresponding to the layer is determined
according to a number of elements corresponding to the layer in the
first feedback information with a value greater than the
predetermined threshold.
4. The method according to claim 1, wherein determining, according
to the relationship between the elements in the first feedback
information and the predetermined threshold, the number of elements
in the second feedback information comprises: determining,
according to the number of the elements with the value greater than
the predetermined threshold in the first feedback information, the
number of elements in the second feedback information.
5. The method according to claim 1, wherein L information elements
in the second feedback information correspond to L elements with a
value greater than a predetermined threshold in the first feedback
information.
6. The method according to claim 1, wherein each element having a
value equal to or less than the predetermined threshold in the
first feedback information corresponds to second information with a
fixed value, each element having a value greater than the
predetermined threshold in the first feedback information
corresponds to second information included in the second feedback
information.
7. The method according to claim 1, comprising: determining a
number of receiving resources, and transmitting the number of the
receiving resources to a first communication node.
8. The method according to claim 7, wherein the number of the
receiving resources satisfies at least one of following
characteristics: a number of time domain units required for a
signal is determined according to the number of the receiving
resources, wherein the signal is transmitted by the first
communication node after the first communication node receives the
number of receiving resources; a number of time division resources
in a beam measurement phase is determined according to the number
of the receiving resources; a number of time division resources in
a next beam measurement phase is determined according to the number
of the receiving resources and a number of receiving antennas of a
second communication node; the number of the receiving resources is
a number of receiving resources corresponding to one transmitting
resource; the number of the receiving resources is a number of
receiving resources corresponding to more than one transmitting
resource; the number of the receiving resources is a number of
receiving resources corresponding to the second communication node;
the number of the receiving resources comprises a number of
receiving beams; or the number of the receiving resources is
comprised in capability information reported by the second
communication node, wherein one transmitting resource corresponds
to one transmitting beam, the second communication node is
responsible for reporting the number of the receiving
resources.
9. A method for feeding back channel information, comprising:
receiving first feedback information; and determining, according to
a relationship between elements in the first feedback information
and a predetermined threshold, a number of elements in second
feedback information.
10. The method according to claim 9, wherein determining the number
of elements in the second feedback information according to the
relationship between the elements in the first feedback information
and the predetermined threshold comprises one of followings:
determining the number of elements in the second feedback
information corresponding to each layer according to a number of
elements with a value greater than the predetermined threshold in
the first feedback information corresponding to the layer, wherein
the number of elements with the value greater than the
predetermined threshold in the first feedback information
corresponding to the layer is determined according to a number of
elements corresponding to the layer in the first feedback
information with a value greater than the predetermined threshold;
or determining, according to the number of the elements with the
value greater than the predetermined threshold in the first
feedback information, the number of elements in the second feedback
information.
11. The method according to claim 9, wherein L information elements
in the second feedback information correspond to L elements with a
value greater than a predetermined threshold in the first feedback
information.
12. The method according to claim 9, wherein each element having a
value equal to or less than the predetermined threshold in the
first feedback information corresponds to second information with a
fixed value, each element having a value greater than the
predetermined threshold in the first feedback information
corresponds to second information included in the second feedback
information.
13. The method according to claim 9, comprising: receiving a number
of receiving resources transmitted by a second communication
node.
14. The method according to claim 13, wherein the number of the
receiving resources satisfies at least one of following
characteristics: a number of time domain units required for a
signal is determined according to the number of the receiving
resources, wherein the signal is transmitted by a first
communication node after the first communication node receives the
number of receiving resources; a number of time division resources
in a beam measurement phase is determined according to the number
of the receiving resources; a number of time division resources in
a next beam measurement phase is determined according to the number
of the receiving resources and a number of receiving antennas of
the second communication node; the number of the receiving
resources is a number of receiving resources corresponding to one
transmitting resource; the number of the receiving resources is a
number of receiving resources corresponding to more than one
transmitting resource; the number of the receiving resources is a
number of receiving resources corresponding to the second
communication node; the number of the receiving resources comprises
a number of receiving beams; or the number of the receiving
resources is comprised in capability information reported by the
second communication node, wherein one transmitting resource
corresponds to one transmitting beam, the first communication node
is responsible for receiving the number of the receiving resources
transmitted by the second communication node.
15. A device for feeding back channel information, comprising: a
processor; and a memory for storing instructions executable by the
processor, wherein the processor is configured to: transmit first
feedback information; and determine, according to a relationship
between elements in the first feedback information and a
predetermined threshold, a number of elements in second feedback
information.
16. The device according to claim 15, wherein the processor is
specifically configured to: determine the number of elements in the
second feedback information corresponding to each layer according
to a number of elements with a value greater than the predetermined
threshold in the first feedback information corresponding to the
layer, wherein the number of elements with the value greater than
the predetermined threshold in the first feedback information
corresponding to the layer is determined according to a number of
elements corresponding to the layer in the first feedback
information with a value greater than the predetermined
threshold.
17. The device according to claim 15, wherein L information
elements in the second feedback information correspond to L
elements with a value greater than a predetermined threshold in the
first feedback information.
18. A device for feeding back channel information, comprising: a
processor; and a memory for storing instructions executable by the
processor, wherein the processor is configured to implement the
method of claim 6.
19. The device according to claim 18, wherein the processor is
specifically configured to: determine the number of elements in the
second feedback information corresponding to each layer according
to a number of elements with a value greater than the predetermined
threshold in the first feedback information corresponding to the
layer, wherein the number of elements with the value greater than
the predetermined threshold in the first feedback information
corresponding to the layer is determined according to a number of
elements corresponding to the layer in the first feedback
information with a value greater than the predetermined
threshold.
20. The device according to claim 18, wherein L information
elements in the second feedback information correspond to L
elements with a value greater than a predetermined threshold in the
first feedback information.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This is a continuation of U.S. Non-Provisional application
Ser. No. 16/484,094, filed on Aug. 6, 2019, which is a National
Stage Application, filed under 35 U.S.C. 371, of International
Patent Application No. PCT/CN2018/071654, filed on Jan. 5, 2018,
which claims priority to Chinese patent application No.
201710067275.0 filed on Feb. 6, 2017, contents of each of which are
incorporated herein by reference in their entireties.
TECHNICAL FIELD
[0002] The present disclosure relates to communication technology
and, in particular, to a method and device for feeding back, a
method and device for receiving channel information, and computer
storage medium.
BACKGROUND
[0003] High frequency communication is one of the core technologies
of wireless communication technology in the future. The high
frequency communication can effectively support communication with
a large bandwidth and a large capacity. However, the high frequency
communication has large channel fading, which requires use of beams
in long distance communication.
[0004] Further research is required on following questions: how
does a terminal select a beam from multiple beams transmitted by a
base station; after the selected beam is fed back to the base
station, how does the base station make assumption about these
multiple beams fed back by the terminal, especially about receiving
conditions of the terminals corresponding to the multiple
beams.
[0005] On the other hand, in order to assist the base station in
performing subsequent beam training and data transmission, further
research is also required on what information to be fed back by the
terminal in beam training. In addition, further research is also
required on how to support multi-layer transmission based on beam
mechanism.
SUMMARY
[0006] Embodiments of the present disclosure provide a method and
device for feeding back, a method and device for receiving channel
information, and computer storage medium.
[0007] A method for feeding back channel information according to
an embodiment of the present disclosure includes steps described
below.
[0008] A candidate resource set is determined, M resources are
selected from the candidate resource set, and at least one of
indication information or channel state information of the selected
M resources is transmitted to a first communication node, M is a
positive integer.
[0009] A selection criterion for selecting the M resources from the
candidate resource set is determined in at least one of following
manners: agreeing a selection criterion or a selection criterion
set with the first communication node, or obtaining a selection
criterion or a selection criterion set according to received
indication information transmitted by the first communication node.
The selection criterion set includes at least one selection
criterion.
[0010] A method for receiving channel information according to an
embodiment of the present disclosure includes steps described
below.
[0011] At least one of indication information or channel state
information of M resources transmitted by a second communication
node is received, where the M resources are selected by the second
communication node.
[0012] The M resources are obtained from a candidate resource set
by the second communication node based on a selection criterion,
the selection criterion includes at least one of following
characteristics: agreeing a selection criterion or a selection
criterion set with the second communication node, or transmitting
the indication information including the selection criterion or the
selection criterion set to the second communication node, where the
selection criterion set includes at least one selection
criterion.
[0013] A device for feeding back channel information according to
an embodiment of the present disclosure includes a determination
unit, a selection unit and a transmitting unit.
[0014] The determination unit is configured to determine a
candidate resource set.
[0015] The selection unit is configured to select M resources from
the candidate resource set.
[0016] The transmitting unit is configured to transmit at least one
of indication information or channel state information of the
selected M resources to a first communication node, where M is a
positive integer.
[0017] A selection criterion for selecting the M resources from the
candidate resource set is determined in at least one of following
manners: agreeing a selection criterion or a selection criterion
set with the first communication node, or obtaining a selection
criterion or a selection criterion set according to received
indication information transmitted by the first communication node.
The selection criterion set includes at least one selection
criterion.
[0018] A device for receiving channel information according to an
embodiment of the present disclosure includes a receiving unit.
[0019] The receiving unit is configured to receive at least one of
indication information or channel state information of M resources
transmitted by a second communication node, where the M resources
are selected by the second communication node.
[0020] The M resources are obtained from a candidate resource set
by the second communication node based on a selection criterion,
the selection criterion includes at least one of following
characteristics: agreeing a selection criterion or a selection
criterion set with the second communication node, or transmitting
the indication information including the selection criterion or the
selection criterion set to the second communication node. The
selection criterion set includes at least one selection
criterion.
[0021] A method for feeding back channel information according to
an embodiment of the present disclosure includes steps described
below.
[0022] The number of receiving resources is determined, and the
number of receiving resources is transmitted to a first
communication node.
[0023] A method for receiving channel information according to an
embodiment of the present disclosure includes a step described
below.
[0024] A first communication node receives feedback information
transmitted by a second communication node, where the feedback
information includes the number of receiving resources.
[0025] A device for feeding back channel information according to
an embodiment of the present disclosure includes a determination
unit and a transmitting unit.
[0026] The determination unit is configured to determine the number
of receiving resources; and
[0027] the transmitting unit is configured to transmit the number
of receiving resources to a first communication node.
[0028] A device for receiving channel information according to an
embodiment of the present disclosure includes a receiving unit.
[0029] The receiving unit is configured to receive feedback
information transmitted by a second communication node, where the
feedback information includes the number of receiving
resources.
[0030] A method for feeding back channel information according to
an embodiment of the present disclosure includes steps described
below.
[0031] First feedback information is transmitted.
[0032] At least one of a dimension of second feedback information
or a codebook restriction set of the second feedback information is
determined according to non-zero elements in the first feedback
information or a relationship between elements in the first
feedback information and a predetermined threshold.
[0033] In an embodiment of the present disclosure, the method
further includes a step in which the second feedback information is
transmitted.
[0034] In an embodiment of the present disclosure, different layers
in the first feedback information correspond to different non-zero
elements.
[0035] The step in which the dimension of the second feedback
information is determined according to the number of non-zero
elements in the first feedback information includes a step
described below.
[0036] The dimension of the second feedback information
corresponding to a layer is determined according to the number of
non-zero elements in the first feedback information corresponding
to the layer.
[0037] A device for feeding back channel information according to
an embodiment of the present disclosure includes a transmitting
unit and a determination unit.
[0038] The transmitting unit is configured to transmit first
feedback information.
[0039] The determination unit is configured to determine at least
one of a dimension of second feedback information or a codebook
restriction set of the second feedback information according to
non-zero elements in the first feedback information or a
relationship between elements in the first feedback information and
a predetermined threshold.
[0040] A method for feeding back channel information according to
an embodiment of the present disclosure includes steps described
below.
[0041] Signaling information is received, where the signaling
information includes rank information.
[0042] At least one of channel measurement or channel information
feedback is performed according to the rank information.
[0043] In an embodiment of the present disclosure, the rank
information includes one of following characteristics:
[0044] the rank information corresponding to a measurement
reference signal resource represents the maximum number of layers
supported by the measurement reference signal resource; or
[0045] the rank information corresponding to a measurement
reference signal resource represents a set of layers supported by
the measurement reference signal resource.
[0046] In an embodiment of the present disclosure, the rank
information is determined in one of following manners:
[0047] the rank information is determined based on a measurement
reference signal resource;
[0048] the rank information is determined based on a plurality of
measurement reference signal resources;
[0049] the rank information is determined based on configuration of
a channel state information reference signal (CSI-RS) report
setting;
[0050] the rank information is determined based on a configuration
of a link, where the link is configured to associate a resource set
with a report setting;
[0051] the rank information is determined based on a fed back
CSI-RS resource indication (CRI); or
[0052] the rank information is determined based on fed back set
index information of the N first sets, where N is a positive
integer.
[0053] A device for feeding back channel information according to
an embodiment of the present disclosure includes a receiving unit
and a feedback unit.
[0054] The receiving unit is configured to receive signaling
information, where the signaling information includes rank
information.
[0055] The feedback unit is configured to perform at least one of
channel measurement or channel information feedback according to
the rank information.
[0056] A method for feeding back channel information according to
an embodiment of the present disclosure includes a step described
below.
[0057] Signaling information is transmitted, where the signaling
information includes rank information.
[0058] The rank information is used for indicating a second
communication node to perform at least one of channel measurement
or channel information feedback, where the second communication
node is a receiving end of the signaling information.
[0059] A device for feeding back channel information according to
an embodiment of the present disclosure includes a transmitting
unit.
[0060] The transmitting unit is configured to transmit signaling
information, where the signaling information includes rank
information.
[0061] The rank information is used for indicating a second
communication node to perform at least one of channel measurement
or channel information feedback, where the second communication
node is a receiving end of the signaling information.
[0062] In the present disclosure, a candidate resource set is
determined, M resources are selected from the candidate resource
set, and at least one of indication information or channel state
information of the selected M resources is transmitted to a first
communication node, where M is a positive integer. A selection
criterion for selecting the M resources from the candidate resource
set is determined in at least one of following manners: a selection
criterion or a selection criterion set is agreed with the first
communication node, or a selection criterion or a selection
criterion set is obtained according to received indication
information transmitted by the first communication node. The
selection criterion set includes at least one selection criterion.
Through the embodiments of the present disclosure, a terminal can
select a beam from multiple beams transmitted by the base station,
so as to implement long distance communication through beams.
BRIEF DESCRIPTION OF DRAWINGS
[0063] The embodiments of the present disclosure are illustrated by
the drawings in general by way of example and not limitation.
[0064] FIG. 1 is a flowchart of a method for feeding back channel
information according to an embodiment of the present
disclosure.
[0065] FIG. 2 is a flowchart of a method for receiving channel
information according to an embodiment of the present
disclosure.
[0066] FIG. 3 is a schematic diagram of using receiving time to
represent a receiving resource according to an embodiment of the
present disclosure.
[0067] FIGS. 4a-4e are schematic diagrams of different receiving
conditions of a terminal according to an embodiment of the present
disclosure.
[0068] FIG. 5 is a schematic diagram of panels and TXRUs according
to an embodiment of the present disclosure.
[0069] FIG. 6 is a schematic diagram of structural composition of a
device for feeding back channel information according to an
embodiment of the present disclosure.
[0070] FIG. 7 is a schematic diagram of structural composition of a
device for receiving channel information according to an embodiment
of the present disclosure.
[0071] FIG. 8a is a schematic diagram one illustrating
determination of the number of time division signal transmitting
units according to the number of receiving resources according to
an embodiment of the present disclosure.
[0072] FIG. 8b is a schematic diagram two illustrating
determination of the number of time division signal transmitting
units according to the number of receiving resources according to
an embodiment of the present disclosure.
[0073] FIG. 8c is a schematic diagram illustrating determination of
different precoding groups in precoding cycling according to the
number of receiving resources according to an embodiment of the
present disclosure.
[0074] FIG. 8d is a schematic diagram illustrating determination of
polling periods of different precoding groups in precoding cycling
according to the number of receiving resources in an embodiment of
the present disclosure.
[0075] FIG. 9a is a schematic diagram illustrating obtaining of a
value of RI through a terminal according to multiple CSI-RS
resources carrying rank information.
[0076] FIG. 9b is a schematic diagram one of rank information
corresponding to a signaling configuration resource.
[0077] FIG. 9c is a schematic diagram two of rank information
corresponding to a signaling configuration resource.
DETAILED DESCRIPTION
[0078] In order to understand characteristics and technical
contents of the embodiments of the present disclosure in details,
the embodiments of the present disclosure will be described in
detail below with reference to the drawings, which are for
reference only and not intended to limit the embodiments of the
present disclosure.
[0079] FIG. 1 is a flowchart of a method for feeding back channel
information according to an embodiment of the present disclosure.
As shown in FIG. 1, the method includes steps described below.
[0080] In step 101, a candidate resource set is determined.
[0081] In step 102, M resources are selected from the candidate
resource set, and at least one of indication information or channel
state information of the selected M resources is transmitted to a
first communication node, M is a positive integer. Where a
selection criterion for selecting the M resources from the
candidate resource set is determined in at least one of following
manners: a selection criterion or a selection criterion set is
agreed with the first communication node, or a selection criterion
or a selection criterion set is obtained according to received
indication information transmitted by the first communication node,
where the selection criterion set includes at least one selection
criterion.
[0082] In an embodiment of the present disclosure, the M resources
are selected according to at least one of following
information:
[0083] channel quality of resources;
[0084] a correlation degree of resources;
[0085] a receiving resource corresponding to resources;
[0086] a transmitting resource corresponding to resources;
[0087] an arrival time interval of resources; or
[0088] multipath characteristics corresponding to resources.
[0089] In an embodiment of the present disclosure the selection
criterion includes at least one of:
[0090] M resources with optimal channel quality from the candidate
resource set are selected as the M resources;
[0091] X1 resources with optimal channel quality are selected from
the candidate resource set, R1 receiving resources corresponding to
the X1 resources with the optimal quality are determined, and M
transmitting resources with optimal channel quality are selected
from all transmitting resources corresponding to the receiving
resources;
[0092] X1 resources with optimal channel quality are selected from
the candidate resource set, R1 receiving resources corresponding to
the X1 resources with the optimal quality are determined, channel
quality sum of each transmitting resource in the R1 receiving
resources is determined, and M transmitting resources with an
optimal channel quality sum are selected;
[0093] X2 resources with optimal channel quality are selected from
the candidate resource set, R2 receiving resources corresponding to
the X2 resources with the optimal channel quality are determined,
and at least one transmitting resource with optimal channel quality
for each of the R2 receiving resources is determined to form the M
resources;
[0094] an optimal receiving resource for each transmitting resource
is selected from the candidate resource set to obtain T resources,
and M resources with optimal channel quality are selected from the
T resources;
[0095] an optimal transmitting resource for each receiving resource
is selected from the candidate resource set to obtain R resources,
and M resources with optimal channel quality are selected from the
R resources;
[0096] M resources are selected from the candidate resource set,
where the M resources form an equivalent channel with a maximum
rank;
[0097] M resources are selected from the candidate resource set,
where the M resources form an equivalent channel with a maximum
channel capacity;
[0098] R1 receiving resources and M transmitting resources are
selected from the candidate resource set, where an equivalent
channel formed by the M transmitting resources and the R1 receiving
resources has a channel matrix with a maximum rank;
[0099] R1 receiving resources and M transmitting resources are
selected from the candidate resource set, where an equivalent
channel formed by the M transmitting resources and the R1 receiving
resources has a channel matrix with a maximum channel capacity;
[0100] R1 receiving resources are selected from the candidate
resource set, and M1 resources with a minimum correlation degree of
channel response are selected for each of the R1 receiving
resources, where all resources selected for the R1 receiving
resources form the M resources;
[0101] the M resources are selected according to a correlation
degree of resources and channel quality of resources;
[0102] the M resources are selected according to the correlation
degree of resources;
[0103] the M resources with a difference interval of channel
quality greater than a predetermined threshold are selected;
[0104] the M resources with an arrival time interval greater than
the predetermined threshold are selected;
[0105] M resources with a maximum time energy sum are selected from
the candidate resource set, where a time energy sum corresponding
to a resource is a sum of products of arrival time and signal
energy of multiple paths corresponding to the resource;
[0106] M resources with a worst channel quality are selected from
the candidate resource set as the M resources; or
[0107] resources in the candidate resource set are sorted according
to channel quality of resources, and one resource in every
predetermined number of resources is selected to obtain the M
resources.
[0108] X1 and X2 are natural numbers less than or equal to N1, and
N1 is the number of resources included in the candidate resource
set; R1, R2 and R are natural number less than or equal to R_Total,
and R_Total is the number of receiving resources included in the
candidate resource set; where T and M1 are natural numbers less
than or equal to T_Total, and T_Total is the number of transmitting
resources included in the candidate resource set.
[0109] In an embodiment of the present disclosure, the selection of
the M resources according to the correlation degree of resources
and the channel quality of resources satisfies one of following
characteristics:
[0110] the channel quality of the M resources satisfies a first
predetermined condition, or a correlation degree of the M resources
satisfies a second predetermined condition.
[0111] resources with channel quality satisfying the first
predetermined condition are selected from the candidate resource
set first, and then resources with a resource correlation degree
satisfying the second predetermined condition are selected from the
selected resources to obtain the M resources; and
[0112] resources with a resource correlation degree satisfying the
second predetermined condition are selected from the candidate
resource set first, and then resources with channel quality
satisfying the first predetermined condition are selected from the
selected resources to obtain the M resources.
[0113] Here, the first predetermined condition indicates Mx
resources with optimal channel quality (Mx may be greater than or
equal to M), or with channel quality greater than a predetermined
threshold. The second predetermined condition indicates Mx
resources with a minimum correlation degree (Mx may be greater than
or equal to M), or with a correlation degree less than a
predetermined threshold, or with a correlation degree of any two of
the Mx resources being 0, that is, any two of the Mx resources are
orthogonal.
[0114] In an embodiment of the present disclosure, the M resources
selected according to the correlation degree of resources satisfy
at least one of following characteristics:
[0115] the M resources are M resources with a minimum correlation
degree in the candidate resource set;
[0116] the correlation degree of the M resources is less than or
equal to the predetermined threshold;
[0117] the M resources are composed of resources with a correlation
degree less than or equal to the predetermined threshold in the
candidate resource set; the correlation degree of any two of the M
resources is 0; or
[0118] the correlation degree of every two of the M resources has a
sum less than or equal to a sum of correlation degrees of every two
of resources in a first resource subset, where the first resource
subset is composed of any M resources in the candidate resource
set.
[0119] Here, a correlation degree of 0 means that two resources are
orthogonal.
[0120] In an embodiment of the present disclosure, each resource in
the candidate resource set includes a transmitting resource and a
receiving resource.
[0121] In an embodiment of the present disclosure, the indication
information of the M resources includes at least one of following
characteristics:
[0122] the number of receiving resources included in the M
resources is less than or equal to M;
[0123] the number of transmitting resources included in the M
resources is less than or equal to M;
[0124] the M resources comprise a receiving resource and M
transmitting resources;
[0125] the M resources comprise M receiving resources and a
transmitting resource;
[0126] the M resources comprise M receiving resources and M
transmitting resources;
[0127] one or more transmitting resources of the M resources
sharing a receiving resource have a minimum correlation degree
among all correlation degrees of all transmitting resources sharing
the receiving resource;
[0128] a channel response matrix of an equivalent channel formed by
receiving resources and transmitting resources of the M resources
has a maximum rank; or
[0129] a channel response matrix of an equivalent channel formed by
the receiving resources and the transmitting resources of the M
resources has a maximum channel capacity.
[0130] In an embodiment of the present disclosure, a value of M is
determined in at least one of following manners:
[0131] the indication information carrying the value of M
transmitted by the first communication node is received;
[0132] the value of M is determined according to channel quality
threshold agreed with the first communication node;
[0133] the value of M is determined according to a threshold for
correlation between resources agreed with the first communication
node;
[0134] the value of M is determined according to M_Max, where M_Max
is a value agreed with the first communication node, and the value
of M agreed with the first communication node is less than or equal
to the M_Max;
[0135] the value of M is determined according to the number of
receiving resources;
[0136] it is agreed with the first communication node that the
value of M value is equal to the number of resources included in
the candidate resource set;
[0137] the value of M is determined according to the number of
receiving antennas; or
[0138] the value of M is determined according to the number of
receiving panels.
[0139] In an embodiment of the present disclosure, the indication
information transmitted by the first communication node carries a
feedback type, and the selection criterion is obtained according to
the feedback type; or,
[0140] the indication information transmitted by the first
communication node carries feature types satisfied by the M
resources, and the selection criterion is obtained according to the
feature types.
[0141] In an embodiment of the present disclosure, the indication
information of the M resources includes index information of
transmitting resources and quantity information of receiving
resources; or,
[0142] the indication information of the M resources includes the
index information of transmitting resources and quantity
information of receiving resources corresponding to each
transmitting resource.
[0143] In an embodiment of the present disclosure the candidate
resource set includes one of following characteristics:
[0144] the candidate resource set includes N first sets, each first
set corresponds to a piece of rank information, and N is a natural
number;
[0145] the candidate resource set corresponds to a piece of rank
information; or
[0146] the rank information is included in configuration
information of a second set related to the candidate resource
set.
[0147] In an embodiment of the present disclosure, the rank
information includes one of following characteristics:
[0148] the rank information is obtained through the indication
information transmitted by the first communication node, where the
indication information transmitted by the first communication node
may be different from the above indication information of the M
resources;
[0149] the rank information corresponding to a set represents the
maximum number of layers supported by the set;
[0150] the rank information corresponding to a set represents the
number of layers supported by the set;
[0151] selected rank information is obtained according to the N
first sets, and is fed back to the first communication node; or
[0152] the selected rank information is fed back implicitly through
feeding back set index information of the N first sets.
[0153] In an embodiment of the present disclosure the second set
includes at least one of: a channel state information (CSI) report
setting, a CSI measurement set, or a connection set, where the CSI
measurement set includes at least one connection, and each
connection includes a resource set and a report setting.
[0154] In an embodiment of the present disclosure, X1 is equal to 1
and/or X2 is equal to 1.
[0155] Each of R1, R2 and R is equal to an integral multiple of the
number of receiving antennas.
[0156] In an embodiment of the present disclosure, the channel
state information of the M resources includes at least one of
following characteristics:
[0157] channel quality information of each of the M resources is
fed back;
[0158] channel quality of a resource with optimal channel quality
in the M resources is fed back;
[0159] channel quality of a resource with worst channel quality in
the M resources is fed back; or
[0160] average channel quality of the M resources is fed back.
[0161] The channel state information includes at least one of
following information: a reference signal receiving power (RSRP), a
channel quality indication (CQI), a precoding matrix indication
(PMI), or a rank indication (RI).
[0162] In an embodiment of the present disclosure, the indication
information of the M resources includes at least one of following
characteristics:
[0163] resources are sorted according to channel quality of the
resources in the indication information of the M resources;
[0164] the M resources comprise all resources of the candidate
resource set;
[0165] the indication information of the M resources includes the
value of M;
[0166] the indication information of the M resources further
includes indication information of the selection criterion, where
the M resources are obtained based on the selection criterion;
[0167] the indication information of the M resources includes
indication information for grouping; or
[0168] the indication information of the M resources includes
indication information for multi-level grouping.
[0169] In an embodiment of the present disclosure, the grouping
includes at least one of following characteristics:
[0170] resources in a first level group are quasi-co-located
concerning a first type channel characteristic parameter;
[0171] resources in a second level group are quasi-co-located
concerning a second type channel characteristic parameter;
[0172] resources in a same group have a correlation degree less
than or equal to a predetermined threshold; or
[0173] resources in different groups have a correlation degree
greater than the predetermined threshold.
[0174] An example of resources in a same group with a correlation
degree greater than the predetermined threshold is not excluded
here.
[0175] In an embodiment of the present disclosure the first type
and second type channel characteristic parameters comprise at least
one of following characteristics:
[0176] the first type channel characteristic parameter is different
from the second type channel characteristic parameter;
[0177] the first type channel characteristic parameter is a subset
of the second type channel characteristic parameter; or
[0178] one of the first type channel characteristic parameter or
the second type channel characteristic parameter includes a channel
characteristic parameter of an average delay.
[0179] The first type channel characteristic parameter includes at
least one of following parameters: a receiving panel, a
transmitting panel, an average arrival angle, a center arrival
angle, an average angle extension, a vertical average arrival
angle, a horizontal average arrival angle, an average departure
angle, a center departure angle, a vertical average departure
angle, a horizontal average departure angle, a multipath extension,
or an average gain; and
[0180] the second type channel characteristic parameter includes at
least one of following parameters: a receiving antenna, the average
arrival angle, the center arrival angle, the average angle
extension, the vertical average arrival angle, the horizontal
average arrival angle, the average departure angle, the center
departure angle, the vertical average departure angle, the
horizontal average departure angle, the average delay, the
multipath extension, or the average gain.
[0181] In an embodiment of the present disclosure, the indication
information transmitted by the first communication node includes at
least one of following indication information:
[0182] indication information of a radio resource control (RRC)
signaling;
[0183] indication information of a medium access control (MAC)
control element (CE) signaling; or
[0184] indication information of a downlink control information
(DCI) signaling.
[0185] A method for feeding back channel information is further
provided according to an embodiment of the present disclosure, the
method includes steps described below.
[0186] The number of receiving resources is determined, and the
number of the receiving resources is transmitted to a first
communication node.
[0187] In an embodiment, the number of the receiving resources has
a relationship with at least one of following information:
[0188] the number of time domain units required by signals, where
the signals are transmitted by the first communication node after
receiving feedback information;
[0189] the number of reference signal ports;
[0190] the number of precoding polling periods; or
[0191] the number of precoding units.
[0192] In an embodiment, the number of the receiving resources
includes one of following characteristics:
[0193] the number of the receiving resources is the number of
receiving resources corresponding to a transmitting resource;
[0194] the number of the receiving resources is the number of
receiving resources corresponding to more than one transmitting
resources; or
[0195] the number of the receiving resources is the number of
receiving resources corresponding to a second receiving
resource.
[0196] FIG. 2 is a flowchart of a method for receiving channel
information according to an embodiment of the present disclosure.
As shown in FIG. 2, the method includes a step described below.
[0197] In step 201, at least one of indication information or
channel state information of M resources transmitted by a second
communication node is received, where the M resources are selected
by the second communication node. The M resources are obtained from
a candidate resource set by the second communication node based on
a selection criterion, the selection criterion includes at least
one of following characteristics: a selection criterion or a
selection criterion set is agreed with the second communication
node, or the indication information including the selection
criterion or the selection criterion set is transmitted to the
second communication node, where the selection criterion set
includes at least one selection criterion.
[0198] In an embodiment of the present disclosure, the M resources
are selected according to at least one of following
information:
[0199] channel quality of resources;
[0200] a correlation degree of resources;
[0201] a receiving resource corresponding to resources;
[0202] a transmitting resource corresponding to resources;
[0203] an arrival time interval of resources; or
[0204] multipath characteristics corresponding to resources.
[0205] In an embodiment of the present disclosure, the selection
criterion includes at least one of: M resources with optimal
channel quality are selected from the candidate resource set as the
M resources;
[0206] X1 resources with optimal channel quality are selected from
the candidate resource set, R1 receiving resources corresponding to
the X1 resources with the optimal quality are determined, and M
transmitting resources with optimal channel quality are selected
from all transmitting resources corresponding to the receiving
resources;
[0207] X1 resources with optimal channel quality are selected from
the candidate resource set, R1 receiving resources corresponding to
the X1 resources with the optimal quality are determined, channel
quality sum of each transmitting resource in the R1 receiving
resources is determined, and M transmitting resources with an
optimal channel quality sum are selected;
[0208] X2 resources with optimal channel quality are selected from
the candidate resource set, R2 receiving resources corresponding to
the X2 resources with the optimal channel quality are determined,
and at least one transmitting resource with optimal channel quality
for each of the R2 receiving resources is selected to form the M
resources;
[0209] an optimal receiving resource for each transmitting resource
is selected from the candidate resource set to obtain T resources,
and M resources with optimal channel quality are selected from the
T resources;
[0210] an optimal transmitting resource for each receiving resource
is selected from the candidate resource set to obtain R resources,
and M resources with optimal channel quality are selected from the
R resources;
[0211] M resources are selected from the candidate resource set,
where the M resources form an equivalent channel with a maximum
rank;
[0212] M resources are selected from the candidate resource set,
where the M resources form an equivalent channel with a maximum
channel capacity;
[0213] R1 receiving resources and M transmitting resources are
selected from the candidate resource set, where an equivalent
channel formed by the M transmitting resources and the R1 receiving
resources has a channel matrix with a maximum rank;
[0214] R1 receiving resources and M transmitting resources are
selected from the candidate resource set, where an equivalent
channel formed by the M transmitting resources and the R1 receiving
resources has a channel matrix with a maximum channel capacity;
[0215] R1 receiving resources are selected from the candidate
resource set, and M1 resources with a minimum correlation degree of
channel response are selected for each of the R1 receiving
resources, where all resources selected for the R1 receiving
resources form the M resources;
[0216] the M resources are selected according to a correlation
degree of resources and channel quality of resources;
[0217] the M resources are selected according to the correlation
degree of resources;
[0218] the M resources with a difference interval of channel
quality greater than a predetermined threshold are selected;
[0219] the M resources with an arrival time interval greater than
the predetermined threshold are selected;
[0220] M resources with a maximum time energy sum are selected from
the candidate resource set, where a time energy sum corresponding
to a resource is a sum of products of arrival time and signal
energy of multiple paths corresponding to the resource;
[0221] M resources with a worst channel quality are selected from
the candidate resource set as the M resources; or
[0222] resources in the candidate resource set are sorted according
to channel quality of resources, and one resource in every
predetermined number of resources is selected to obtain the M
resources.
[0223] X1 and X2 are natural numbers less than or equal to N1, and
N1 is the number of resources included in the candidate resource
set; R1, R2 and R are natural numbers less than or equal to
R_Total, and R_Total is the number of receiving resources included
in the candidate resource set; T and M1 are natural numbers less
than or equal to T_Total, and T_Total is the number of transmitting
resources included in the candidate resource set.
[0224] The candidate resource set is agreed in advance with the
second communication node, and each resource in the candidate
resource set includes a transmitting resource and a receiving
resource.
[0225] In an embodiment of the present disclosure, the selection of
the M resources according to the correlation degree of resources
and the channel quality of resources satisfies one of following
characteristics:
[0226] channel quality of the M resources satisfies a first
predetermined condition and a correlation degree of the M resources
satisfies a second predetermined condition.
[0227] resources with channel quality satisfying the first
predetermined condition are selected from the candidate resource
set first, and then resources with a resource correlation degree
satisfying the second predetermined condition are selected from the
selected resources to obtain the M resources; or
[0228] resources with a correlation degree of resources satisfying
the second predetermined condition are selected from the candidate
resource set first, and then resources with channel quality
satisfying the first predetermined condition are selected from the
selected resources to obtain the M resources.
[0229] In an embodiment of the present disclosure, the M resources
selected according to the correlation degree of resources satisfy
at least one of following characteristics:
[0230] the M resources are M resources with a minimum correlation
degree in the candidate resource set;
[0231] the correlation degree of the M resources is less than or
equal to the predetermined threshold;
[0232] the M resources are composed of resources with a correlation
degree less than or equal to the predetermined threshold in the
candidate resource set; the correlation degree of any two of the M
resources is 0; or
[0233] a correlation degree of every two of the M resources has a
sum less than or equal to a sum of a correlation degree of every
two of resources in a first resource subset, where the first
resource subset is composed of any M resources in the candidate
resource set.
[0234] In an embodiment of the present disclosure, the M resources
comprise at least one of following characteristics:
[0235] the number of receiving resources included in the M
resources is less than or equal to M;
[0236] the number of transmitting resources included in the M
resources is less than or equal to M;
[0237] the M resources comprise a receiving resource and M
transmitting resources;
[0238] the M resources comprise M receiving resources and a
transmitting resource;
[0239] the M resources comprise M receiving resources and M
transmitting resources;
[0240] one or more transmitting resources of the M resources
sharing a receiving resource have a minimum correlation degree
among all correlation degrees of all transmitting resources sharing
the receiving resource;
[0241] a channel response matrix of an equivalent channel formed by
receiving resources and transmitting resources of the M resources
has a maximum rank; or
[0242] a channel response matrix of an equivalent channel formed by
the receiving resources and the transmitting resources of the M
resources has a maximum channel capacity.
[0243] In an embodiment of the present disclosure, M-related
information is determined and/or notified in at least one of
following manners:
[0244] indication information carrying a value of M is transmitted
to the second communication node;
[0245] indication information carrying threshold information of
channel quality is transmitted to the second communication
node;
[0246] indication information carrying threshold information of a
resource correlation degree is transmitted to the second
communication node;
[0247] indication information carrying M_Max is transmitted to the
second communication node, where the value of M agreed with the
second communication node is less than or equal to M_Max;
[0248] the value of M is transmitted according to the number of
receiving resources;
[0249] it is agreed with the second communication node that the
value of M is equal to the number of resources included in the
candidate resource set;
[0250] the value of M is determined according to the number of
receiving antennas of the second communication node; or
[0251] the value of M is determined according to the number of
receiving panels of the second communication node.
[0252] In an embodiment of the present disclosure, the indication
information transmitted to the second communication node carries a
feedback type, and the selection criterion is notified through the
feedback type; or,
[0253] the indication information transmitted to the second
communication node carries feature types satisfied by the M
resources, and the selection criterion is notified through the
feature types.
[0254] In an embodiment of the present disclosure, the indication
information of the M resources includes index information of
transmitting resources and quantity information of receiving
resources; or,
[0255] the indication information of the M resources includes the
index information of transmitting resources and quantity
information of receiving resources corresponding to each
transmitting resource.
[0256] In an embodiment of the present disclosure, the candidate
resource set includes one of following characteristics:
[0257] the candidate resource set includes N first sets, each first
set corresponds to a piece of rank information, and N is a natural
number;
[0258] the candidate resource set corresponds to a piece of rank
information; or
[0259] the rank information is included in configuration
information of a second set related to the candidate resource
set.
[0260] In an embodiment of the present disclosure, the rank
information includes one of following characteristics:
[0261] the rank information is configured through the indication
information transmitted to the second communication node;
[0262] the rank information corresponding to a set represents the
maximum number of layers supported by the set;
[0263] the rank information corresponding to a set represents the
number of layers supported by the set;
[0264] the second communication node is configured to obtain
feedback information of a rank indication (RI) according to the N
first sets; or
[0265] index information of the N first sets fed back by the second
communication node is received to obtain a value of the RI selected
by the second communication node.
[0266] In an embodiment of the present disclosure, the second set
includes at least one of: a channel state information (CSI) report
setting, a CSI measurement set, or a connection set, where the CSI
measurement set includes at least one connection, and each
connection includes a resource set and a report setting.
[0267] In an embodiment of the present disclosure, X1 is equal to 1
and/or X2 is equal to 1.
[0268] Each of R1, R2 and R is equal to an integral multiple of the
number of receiving antennas.
[0269] In an embodiment of the present disclosure, the channel
state information of the M resources includes at least one of
following characteristics:
[0270] channel quality information of each of the M resources is
fed back;
[0271] channel quality of a resource with optimal channel quality
in the M resources is fed back;
[0272] channel quality of a resource with worst channel quality in
the M resources is fed back; or
[0273] average channel quality of the M resources is fed back.
[0274] In an embodiment of the present disclosure, the indication
information of the M resources includes at least one of following
characteristics:
[0275] resources are sorted according to channel quality of the
resources in the indication information of the M resources;
[0276] the M resources comprise all resources of the candidate
resource set;
[0277] the indication information of the M resources includes the
value of M;
[0278] the indication information of the M resources further
includes indication information of the selection criterion, where
the M resources are obtained based on the selection criterion;
[0279] the indication information of the M resources includes
indication information for grouping; or
[0280] the indication information of the M resources includes
indication information for multi-level grouping.
[0281] In an embodiment of the present disclosure, the grouping
includes at least one of following characteristics:
[0282] resources in a first level group are quasi-co-located
concerning a first type channel characteristic parameter;
[0283] resources in a second level group are quasi-co-located
concerning a second type channel characteristic parameter;
[0284] resources in a same group have a correlation degree less
than or equal to a predetermined threshold; or
[0285] resources in different groups have a correlation degree
greater than the predetermined threshold.
[0286] In an embodiment of the present disclosure, the first type
and second type channel characteristic parameters comprise at least
one of following characteristics:
[0287] the first type channel characteristic parameter is different
from the second type channel characteristic parameter;
[0288] the first type channel characteristic parameter is a subset
of the second type channel characteristic parameter; or
[0289] one of the first type channel characteristic parameter or
the second type channel characteristic parameter includes a channel
characteristic parameter of an average delay.
[0290] The first type channel characteristic parameter includes at
least one of following parameters: a receiving panel, a
transmitting panel, an average arrival angle, a center arrival
angle, an average angle extension, a vertical average arrival
angle, a horizontal average arrival angle, an average departure
angle, a center departure angle, a vertical average departure
angle, a horizontal average departure angle, a multipath extension,
or an average gain.
[0291] The second type channel characteristic parameter includes at
least one of following parameters: a receiving antenna, the average
arrival angle, the center arrival angle, the average angle
extension, the vertical average arrival angle, the horizontal
average arrival angle, the average departure angle, the center
departure angle, the vertical average departure angle, the
horizontal average departure angle, the average delay, the
multipath extension, or the average gain.
[0292] In an embodiment of the present disclosure, the indication
information transmitted to the second communication node includes
at least one of following indication information:
[0293] indication information of a RRC signaling;
[0294] indication information of a MAC CE signaling; or
[0295] indication information of a DCI signaling.
[0296] In an embodiment of the present disclosure, indication
information for notifying of the selection criterion includes
receiving state type information of the second communication node
corresponding to the channel state information of the second
communication node; and/or,
[0297] the channel state information fed back by the second
communication node is received, and receiving state information of
the second communication node corresponding to the channel state
information of the second communication node is determined.
[0298] In an embodiment of the present disclosure, the channel
state information reported by the second communication node is
received, and a correspondence between the channel state and a
receiving state of the second communication node includes at least
one of:
[0299] the channel state is obtained by the second communication
node using one receiving beam of one TXRU;
[0300] the channel state is obtained by the second communication
node using all TXRUs of one panel;
[0301] the channel state is obtained by the second communication
node using part of panels, where all TXRUs in each of the part of
panels are used;
[0302] the channel state is obtained by the second communication
node using part of panels, all or part of TXRUs in each of the part
of panels are used; or
[0303] the channel state is obtained by the second communication
node using all TXRUs of all panels.
[0304] In an embodiment of the present disclosure, a method for
receiving channel information is provided. The method includes a
step described below.
[0305] A first communication node receives feedback information
transmitted by a second communication node, where the feedback
information includes the number of receiving resources.
[0306] In an embodiment, the method further includes a step in
which transmission information of a signal is determined by the
first communication node according to the feedback information
transmitted by the second communication node, where the signal is
transmitted by the first communication node to the second
communication node.
[0307] In an embodiment, the transmission information includes at
least one of following information:
[0308] the number of time domain units required for transmitting
signals;
[0309] the number of reference signal ports;
[0310] a precoding polling period; or
[0311] the number of precoding units.
[0312] In an embodiment, the number of receiving resources has a
relationship with at least one of following information:
[0313] the number of time domain units required for transmitting
the signal, where the signal is transmitted by the first
communication node after receiving feedback information;
[0314] the number of reference signal ports;
[0315] a precoding polling period; or
[0316] the number of precoding units.
[0317] In an embodiment, the receiving resources comprise one of
following characteristics: the number of receiving resources is the
number of receiving resources corresponding to a transmitting
resource;
[0318] the number of receiving resources is the number of receiving
resources corresponding to more than one transmitting resources;
or
[0319] the number of the receiving resources is the number of
receiving resources corresponding to a second receiving
resource.
[0320] In an embodiment of the present disclosure, a method for
feeding back channel information is provided. The method includes
steps described below.
[0321] First feedback information is transmitted.
[0322] At least one of a dimension of second feedback information
or a codebook restriction set of the second feedback information is
determined according to non-zero elements in the first feedback
information or a relationship between elements in the first
feedback information and a predetermined threshold.
[0323] In an embodiment, the method further includes a step
below.
[0324] When the second feedback information has a dimension larger
than 0, the second feedback information is transmitted.
[0325] In an embodiment, different layers in the first feedback
information correspond to different non-zero elements, or different
layers in the first feedback information correspond to different
numbers of elements with a value greater than the predetermined
threshold.
[0326] The step in which the dimension of the second feedback
information is determined according to the non-zero elements in the
first feedback information or the relationship between the elements
in the first feedback information and the predetermined threshold
includes one of following steps:
[0327] the dimension of the second feedback information
corresponding to a layer is determined according to the number of
non-zero elements in the first feedback information corresponding
to the layer; or,
[0328] the dimension of the second feedback information
corresponding to a layer is determined according to the number of
elements with a value greater than the predetermined threshold in
the first feedback information corresponding to the layer.
[0329] In an embodiment, the step in which at least one of the
dimension of the second feedback information or the codebook
restriction set of the second feedback information is determined
according to the relationship between the elements in the first
feedback information and the predetermined threshold includes a
step described below.
[0330] At least one of the dimension of the second feedback
information or the codebook restriction set of the second feedback
information is determined according to the number of the elements
with a value greater than the predetermined threshold in the first
feedback information.
[0331] In an embodiment, L information elements in the second
feedback information correspond to L non-zero elements in the first
feedback information; or,
[0332] the L information elements in the second feedback
information correspond to L elements with a value greater than the
predetermined threshold in the first feedback information.
[0333] In an embodiment of the present disclosure, a device for
feeding back channel information is provided. The device includes a
transmitting unit and a determination unit.
[0334] The transmitting unit is configured to transmit first
feedback information.
[0335] The determination unit is configured to determine at least
one of a dimension of second feedback information or a codebook
restriction set of the second feedback information, according to
non-zero elements in the first feedback information or a
relationship between elements in the first feedback information and
a predetermined threshold.
[0336] In an embodiment, the transmitting unit is further
configured to transmit the second feedback information when the
second feedback information has a dimension larger than 0.
[0337] In an embodiment, different layers in the first feedback
information correspond to different non-zero elements, or different
layers in the first feedback information correspond to different
numbers of elements with a value greater than the predetermined
threshold.
[0338] The determination unit is specifically configured to
determine the dimension of the second feedback information
corresponding to a layer according to the number of non-zero
elements in the first feedback information corresponding to the
layer; or,
[0339] determine the dimension of the second feedback information
corresponding to a layer according to the number of elements with a
value greater than the predetermined threshold in the first
feedback information corresponding to the layer.
[0340] In an embodiment, the determination unit is specifically
configured to determine at least one of the dimension of the second
feedback information or the codebook restriction set of the second
feedback information, according to the number of the elements with
the value greater than the predetermined threshold in the first
feedback information.
[0341] In an embodiment, L information elements in the second
feedback information correspond to L non-zero elements in the first
feedback information; or,
[0342] the L information elements in the second feedback
information correspond to L elements with a value greater than the
predetermined threshold in the first feedback information.
[0343] In the embodiments of the present disclosure, a method for
feeding back channel information is provided. The method includes
steps described below.
[0344] Signaling information is received, where the signaling
information includes rank information.
[0345] At least one of channel measurement or channel information
feedback is performed according to the rank information.
[0346] In an embodiment, the rank information includes one of
following characteristics:
[0347] the rank information corresponding to a measurement
reference signal resource represents the maximum number of layers
supported by the measurement reference signal resource; or
[0348] the rank information corresponding to a measurement
reference signal resource represents a set of layers supported by
the measurement reference signal resource.
[0349] In an embodiment, the rank information is determined based
on one of following manners:
[0350] the rank information is determined based on a measurement
reference signal resource;
[0351] the rank information is determined based on a plurality of
measurement reference signal resources;
[0352] the rank information is determined based on configuration of
a channel state information reference signal (CSI-RS) report
setting;
[0353] the rank information is determined based on a configuration
of a link, where the link is configured to associate a resource set
with a report setting;
[0354] the rank information is determined based on a fed back
CSI-RS resource indication (CRI); or
[0355] the rank information is determined based on fed back set
index information of the N first sets, where N is a positive
integer.
[0356] In the embodiments of the present disclosure a method for
feeding back channel information is provided, the device includes a
receiving unit and a feedback unit.
[0357] The receiving unit is configured to receive signaling
information rank information, the signaling information includes
rank information; and
[0358] the feedback unit is configured to perform at least one of
channel measurement or channel information feedback according to
the rank information.
[0359] In an embodiment, the rank information includes one of
following characteristics:
[0360] the rank information corresponding to a measurement
reference signal resource represents the maximum number of layers
supported by the measurement reference signal resource; or
[0361] the rank information corresponding to a measurement
reference signal resource represents a set of layers supported by
the measurement reference signal resource.
[0362] In an embodiment, the rank information is determined based
on one of following manners:
[0363] the rank information is determined based on a measurement
reference signal resource;
[0364] the rank information is determined based on a plurality of
measurement reference signal resources;
[0365] the rank information is determined based on configuration of
a channel state information reference signal (CSI-RS) report
setting;
[0366] the rank information is determined based on a configuration
of a link, where the link is configured to associate a resource set
with a report setting;
[0367] the rank information is determined based on a fed back
CSI-RS resource indication (CRI); or
[0368] the rank information is determined based on fed back set
index information of N first sets, where N is a positive
integer.
[0369] In an embodiment of the present disclosure, a device for
feeding back channel information is provided. The device includes a
transmitting unit.
[0370] The transmitting unit is configured to transmit signaling
information, where the signaling information includes rank
information. The rank information is used for indicating a second
communication node to perform at least one of channel measurement
or channel information feedback, where the second communication
node is a receiving end of the signaling information.
[0371] In an embodiment, the rank information includes one of
following characteristics:
[0372] the rank information corresponding to a measurement
reference signal resource represents the maximum number of layers
supported by the measurement reference signal resource; or
[0373] the rank information corresponding to a measurement
reference signal resource represents a set of layers supported by
the measurement reference signal resource.
[0374] In an embodiment, the rank information is determined based
on one of following manners:
[0375] the rank information is determined based on a measurement
reference signal resource;
[0376] the rank information is determined based on a plurality of
measurement reference signal resources;
[0377] the rank information is determined based on a configuration
of a report setting of CSI-RSs;
[0378] the rank information is determined based on a configuration
of a link, where the link is configured to associate a resource set
with a report setting;
[0379] the rank information is determined based on a fed back
CSI-RS resource indication (CRI); or
[0380] the rank information is determined based on fed back set
index information of the N first sets, where N is a positive
integer.
[0381] The embodiments of the present disclosure will be described
in further detail below with reference to specific application
scenarios.
[0382] In following embodiments, a terminal (or base station) may
have multiple panels. As shown in FIG. 5, each panel corresponds to
an antenna oscillator matrix. The oscillator in a matrix are
arranged at a horizontal distance and a vertical distance denoted
as (d_v, d_h), panels are arranged at a horizontal distance and a
vertical distance denoted as (d_v_g, d_h_g). In general, (d_v_g,
d_h_g) are different from (d_v, d_h). Each panel may have one or
more TXRUs, and each TXRU may only correspond to one radio
frequency beam at a time. For example, in FIG. 5, each column in
panel_0 corresponds to one TXRU, the panel_0 corresponds to three
TXRUs in a single polarization mode and six TXRUs in a dual
polarization mode.
Embodiment 1
[0383] In this embodiment, a terminal selects M resources from a
candidate resource set, and feeds back at least one of the
indication information or the channel quality information of the
selected M resources to a base station (i.e. the first
communication node). A selection criterion for selecting the M
resources from the candidate resource set is determined in at least
one of following manners: a selection criterion or a selection
criterion set is agreed with the first communication node, or a
selection criterion or a selection criterion set is obtained
according to received indication information transmitted by the
first communication node, where the selection criterion set
includes at least one selection criterion.
[0384] Before selecting the M resources, the terminal determines
the candidate resource set. After that, the terminal selects M
resources from the candidate resource set.
[0385] Resources in the candidate resource set include at least one
of following resources: a transmitting beam resource, a
transmitting antenna resource, a transmitting port resource, a
transmitting frequency domain resource, a transmitting sequence
resource, a transmitting time domain resource, a transmitting mode
resource, a receiving beam resource, a receiving antenna resource,
a receiving port resource, a receiving frequency domain resource, a
receiving sequence resource, a receiving time domain resource, or a
receiving mode resource. The port resource is a reference signal
port resource.
[0386] In an embodiment of the present disclosure, X resources with
optimal channel quality are the X resources having best channel
quality.
[0387] Specifically, for example, a resource is composed of a
transmitting beam and a receiving beam. In a case of eight
transmitting beams and four receiving beams, there are 8*4
transmitting-receiving beam pairs. That is, the candidate resource
set is composed of eight transmitting-receiving beam pairs. The
channel quality of those transmitting-receiving beam pairs forms an
8*4 matrix (or similar to a 4*8 matrix), where an element in i-th
row and j-th column represents the channel quality of an i-th
transmitting beam to a j-th receiving beam. Specifically, it is
assumed that the matrix is as shown in Table 1, where the channel
quality may be a RSRP of a transmitting beam to a receiving
beam.
TABLE-US-00001 TABLE 1 Transmitting Beam Receiving Beam 0 1 2 3 0
9.57 4.21 6.79 2.76 1 9.64 9.16 7.58 0.46 2 1.57 7.92 7.43 0.97 3
9.70 9.59 3.92 8.23 4 9.57 6.56 6.56 6.94 5 4.85 0.35 1.71 3.17 6
8.00 8.49 7.06 9.50 7 1.42 9.34 0.31 0.34
[0388] Now, M transmitting-receiving beam pairs are selected from
the 8*4 transmitting-receiving beam pairs, and information
corresponding to the selected transmitting beam pairs is fed back
to the base station.
[0389] The selection criterion for selecting the M
transmitting-receiving beam pairs may include one of following
criteria.
[0390] Selection criterion 1: the selected M resources
(hereinafter, a transmitting-receiving beam pair is referred to as
a resource), and the M resources are resources with optimal channel
quality of those 8*4 resources, so the selected M resources may
have different resources corresponding to a same transmitting
resource, or may have different resources corresponding to a same
receiving resource. In conclusion, the number of transmitting
resources included in the M resources now is less than or equal to
M, and/or the number of receiving resources included in the M
resources is less than or equal to M. Specifically, as shown in
Table 1, it is assumed that M=4, now four resources of {(3, 0), (1,
0), (3, 1), (0, 0)} or {(3, 0), (1, 0), (3, 1), (4, 0)} are
selected, since (0, 0) and (4, 0) correspond to the same channel
quality, where (x, y) represents a resource composed of
(transmitting beam x, receiving beam y).
[0391] Selection criterion 2: X1 resources are selected from the M
resources first. For example, X1 resources with optimal channel
quality are selected to obtain R1 receiving resources corresponding
to these X1 resources, and M resources with optimal channel quality
are selected for these R1 receiving resources. The selection of M
resources with the optimal quality from the R1 receiving resources
is specifically as shown in Table 1. It is assumed that X1=3,
resources of {(3, 0), (1, 0), (3, 1)} are obtained, and then M
resources are selected for R1 receiving resources {0,1}
corresponding to the X1 resources, for example, M=5. M resources
with the optimal channel quality may be selected from the R1
receiving resources, so that resources of {(3, 0), (1, 0), (3, 1),
(0, 0), (4, 0)} are obtained at this point. The number of
transmitting beams and the number of receiving beams corresponding
to the M resources are less than M at this moment.
[0392] It may be agreed that X1 is equal to 1, that is, a resource
with optimal channel quality is selected, and then M resources with
optimal channel quality under a receiving resource of this resource
are selected. As shown in Table 1, a resource of (3, 0) is selected
first, and then M transmitting beams with optimal channel quality
corresponding to receiving beam 0 are selected to obtain a
transmitting beam set of {3, 1, 0, 4}.
[0393] Selection criterion 3: R1 receiving beams are selected
first, a quality sum of each transmitting beam in the R1 receiving
beams is obtained, and M resources with an optimal quality sum are
selected.
[0394] Specifically, for example, a combination of receiving beams
{0, 1} is selected first. At this time, a sum of receiving quality
of the R1 receiving resources is obtained for each transmitting
resource, and then M transmitting resources with an optimal sum of
receiving quality are selected. R1 may be less than or equal to the
number of panels or TXRUs of the terminal, so that Table 2 is
obtained. Now, a selected transmitting beam set is {3, 1, 6, 4, 0},
and further a receiving beam set corresponding to these
transmitting resources is {0, 1}. The selected M resources include
M different transmitting beams, and the number of receiving beams
is less than M at this time.
TABLE-US-00002 TABLE 2 Combination of Receiving Transmitting Beam
Beams (0, 1) 0 13.78 1 18.80 2 9.49 3 19.29 4 16.13 5 5.20 6 16.49
7 10.76
[0395] Selection criterion 4: X resources with optimal channel
quality are selected from the candidate resource set to obtain R2
receiving resources corresponding to the X resources with the
optimal channel quality; one or more transmitting resources with
optimal channel quality are selected for each of the R2 receiving
resource, so as to form the M resources. The selection criterion 4
is similar to selection criterion 2, and the difference is that M1
transmitting resources with the optimal channel quality are
selected for each of the obtained R2 receiving resource, and the
R2*M1 transmitting resources form M transmitting resources. In this
embodiment, an equal number of M1 of transmitting resources are
selected for each of the R2 receiving resources, and this
embodiment does not exclude an unequal number of transmitting beams
selected for each of the R2 receiving beams. Specifically, as shown
in Table 1, it is assumed that X1=3, resources of {(3, 0), (1, 0),
(3, 1)} are obtained, and then M resources are selected for R1
receiving resources of {0, 1} corresponding to the X1 resources,
such as M=4, M1=2, and selected resources are {transmitting beam 3,
transmitting beam 1} corresponding to receiving beam 0, and
{transmitting beam 3, transmitting beam 7} corresponding to
receiving beam 1.
[0396] Selection criterion 5: an optimal receiving resource is
selected for each transmitting resource in the candidate resource
set, so as to obtain T resources; and M resources with optimal
channel quality are selected from the T resources. T is the number
of transmitting resources. Specifically, as shown in Table 1, the T
resources shown in Table 3 are obtained. Then M transmitting beams
are selected to obtain selected combinations of transmitting beams
and receiving beams of {(3, 0), (1, 0), (0, 0), (4, 0)}. At this
time, the selected receiving beams are the same. However, it is not
excluded that the selected transmitting beams may correspond to
different receiving beams in other embodiments of Table 1.
TABLE-US-00003 TABLE 3 Transmitting (Channel Quality, Beam
Receiving Beam) 0 (9.57, 0) 1 (9.64, 0) 2 (7.92, 1) 3 (9.70, 0) 4
(9.57, 0) 5 (4.85, 0) 6 (9.50, 3) 7 (9.34, 1)
[0397] Selection criterion 6: an optimal transmitting resource is
selected for each receiving resource in the candidate resource set,
so as to obtain R resources; M resources with optimal channel
quality are selected from the R resources. For example, a result
shown in Table 4 is obtained based on Table 1, and a selected set
of (transmitting beam, receiving beam) is {(3, 0), (3, 1), (1, 2),
(6, 3)}.
TABLE-US-00004 TABLE 4 Receiving (Channel Quality, Beam
Transmitting Beam) 0 (9.70, 3) 1 (9.70, 3) 2 (7.58, 1) 3 (9.50,
6)
[0398] The above-mentioned selected resources are reported in two
manners. In a manner, the terminal reports transmitting beam index
and receiving beam index of each selected resource to the base
station. In another manner, the terminal only reports the
transmitting beam index, and the base station obtains a receiving
beam condition based on a selection criterion used by the terminal.
Specifically, when the terminal uses selection criterion 1, the
base station assumes that a transmitting beam reported by the
terminal may be received on multiple receiving beams. For selection
criterion 1, the terminal at this time may further report the
number of receiving beams corresponding to each transmitting beam
in the selected M resources. Specifically, as described above,
transmitting-receiving beam pairs of {(3, 0), (1, 0), (3, 1), (0,
0)} are selected based on the selection criterion 1, and the
reported information includes {(transmitting beam 3, two receiving
beams), (transmitting beam 1, one receiving beam), (transmitting
beam 0, one receiving beam)}.
[0399] Selection criterion 7: a resource with optimal channel
quality is selected first, then the channel quality of resources in
a row corresponding to the transmitting resource of the selected
resource and the channel quality of resources in a column
corresponding to the receiving resource of the selected resource
are all set to 0; a next resource with optimal channel quality is
selected to be a selected second resource, then the channel quality
of resources in a row corresponding to the transmitting resource of
the second selected resource and the channel quality of resources
in a column corresponding to the receiving resource of the second
selected resource are all set to 0; and then a third resource with
optimal channel quality is selected, and so on. Specifically
referring to Table 1, after an optimal resource of (3, 0) is
selected, a row corresponding to transmitting beam 3 is set to 0,
and a column corresponding to receiving beam 0 is set to 0, so a
Table 4-1 is obtained. Then a second resource of (6, 3) with
optimal channel quality is selected from this Table 4-1. After the
second resource is selected, a row corresponding to transmitting
beam 6 and a column corresponding to receiving beam 3 are set to 0
to obtain a table shown in Table 4-2. Then a resource of (7, 1) is
selected, and a row corresponding to transmitting beam 7 and a
column corresponding to receiving beam 1 are set to 0 to obtain
Table 4-3. Then a resource of (1, 2) is selected. In conclusion, at
this time selected resources are {(3, 0), (6, 3), (7, 1), (1, 2)}.
It can be seen that M is less than or equal to min(the number of
transmitting beams, the number of receiving beams). At this time, M
resources include M different transmitting beams and M different
receiving beams.
TABLE-US-00005 TABLE 4-1 Transmitting Beam Receiving Beam 0 1 2 3 0
0 4.21 6.79 2.76 1 0 9.16 7.58 0.46 2 0 7.92 7.43 0.97 3 0 0 0 0 4
0 6.56 6.56 6.94 5 0 0.35 1.71 3.17 6 0 8.49 7.06 9.50 7 0 9.34
0.31 0.34
TABLE-US-00006 TABLE 4-2 Transmitting Beam Receiving Beam 0 1 2 3 0
0 4.21 6.79 0 1 0 9.16 7.58 0 2 0 7.92 7.43 0 3 0 0 0 0 4 0 6.56
6.56 0 5 0 0.35 1.71 0 6 0 0 0 0 7 0 9.34 0.31 0
TABLE-US-00007 TABLE 4-3 Transmitting Beam Receiving Beam 0 1 2 3 0
0 0 6.79 0 1 0 0 7.58 0 2 0 0 7.43 0 3 0 0 0 0 4 0 0 6.56 0 5 0 0
1.71 0 6 0 0 0 0 7 0 0 0 0
[0400] Selection criterion 8: the M resources are resources with
worst channel quality in the candidate resource set.
[0401] In the examples described above, a transmitting beam may be
equivalent to a transmitting resource, and a receiving beam may be
equivalent to a receiving resource. When a transmitting resource
represents a measurement reference signal port, the transmitting
resource may be one of: a measurement reference signal port, a
group of measurement reference signal ports, a measurement
reference signal resource, or a group of measurement reference
signal resources. A receiving resource may be a receiving period or
receiving time, as shown in FIG. 3. Different receiving resources
are represented through different receiving time. In a first
receiving period, the transmitting beam is switched and the
receiving beam is unchanged, the terminal receives. In a first
receiving mode, signals transmitted by the base station on the
transmitting resource; and in a second receiving period, the
terminal receives, in a second receiving mode, signals transmitted
by the base station on the transmitting resource. Receiving manners
corresponding to different receiving modes are time divisional,
i.e., the terminal may only receive signals in a receiving manner
corresponding to one receiving mode at a time. At this time, a
receiving resource includes a receiving beam set, and the receiving
beam set includes one or more receiving beams.
[0402] When a transmitting resource consists of multiple
transmitting ports (or transmitting antennas) and a receiving
resource consists of multiple receiving ports (or receiving
antennas), a resource may be equivalent to an MIMO channel in the
form of Rx*Tx matrix, where Rx represents the number of receiving
ports and Tx represents the number of transmitting ports. Some
characteristics of the MIMO channel may be used for indicating the
channel quality, such as a square of maximum eigenvalue of the
equivalent MIMO channel, a square sum of eigenvalues of the
equivalent MIMO channel, a channel capacity of the equivalent MIMO
channel. Alternatively, the channel quality is characterized by a
rank of the equivalent MIMO channel at this time, and the channel
quality is better when the rank is larger; or the channel quality
is jointly characterized by an eigenvalue and the rank of the
equivalent MIMO channel. Alternatively, a reciprocal of condition
number of the equivalent MIMO channel is used for characterizing
the channel quality.
[0403] The channel quality in this embodiment may also be a
CQI.
[0404] The fed back channel state information may include at least
one of: a reference signal receiving power (RSRP), channel quality
indication information (such as a CQI or other channel quality
measurement information), a precoding matrix indication (PMI), or a
rank indication (RI).
[0405] Of course, the selection criterion may also include other
criteria other than criteria described in this embodiment. In
short, the selection criterion of the terminal is determined in
several manners at this time.
[0406] Manner 1: The selection criterion is agreed with the base
station.
[0407] Manner 2: A selection criterion set is agreed with the base
station, and the selection criterion is determined by the terminal
itself. In an embodiment, the indication information of the M
resources reported by the terminal further includes indication
information of the selection criterion The M resources are selected
by the terminal based on the indicated selection criterion.
[0408] Manner 3: The base station configures a selection criterion
for the terminal through the indication information.
[0409] Manner 4: The base station configures a selection criterion
set for the terminal through the indication information, and the
terminal itself determines the selection criterion. In an
embodiment, the indication information of the M resources reported
by the terminal further includes the indication information of the
selection criterion. The M resources are selected by the terminal
based on the indicated selection criterion.
Embodiment 2
[0410] When channel quality corresponding to a resource is fed back
by the terminal, the base station needs to assume which receiving
condition is used by the terminal for obtaining the channel state
information, or the base station notifies the terminal through the
indication information that under which receiving condition the
terminal may obtain the channel state information.
[0411] For example, the terminal has three panels, and each panel
has two TXRUs corresponding to a polarization direction. In other
words, one polarization direction corresponds to 2*3=6 TXRUs and
two polarization direction correspond to 2*6=12 TXRUs. A panel
represents an antenna oscillator matrix. In general, the
oscillators in each panel are uniformly distributed. The
oscillators in each panel may correspond to one or more TXRUs using
different virtualization methods, one of the TXRUs has its own
independent ADC/DAC unit (however, two dual-polarized TXRUs may
share an ADC/DAC, i.e., a radio frequency beam forming unit).
[0412] For signals transmitted by the base station on a
transmitting resource, the terminal will report receiving quality,
which corresponds to several receiving conditions of the terminal
as follows:
[0413] receiving condition 1: the channel quality is obtained by
the terminal using only one receiving beam of a TXRU, or two TXRUs
in two polarization directions at this point, as shown in FIG.
4a;
[0414] receiving condition 2: the channel quality is obtained by
the terminal using all TXRUs in one panel, those TXRUs may be
single-polarized or dual-polarized at this point, as shown in FIG.
4b;
[0415] receiving condition 3: the channel quality is obtained using
only part of the panels, and all TXRUs in each of the part of
panels are used, those TXRUs may be single-polarized or
dual-polarized, as shown in FIG. 4c;
[0416] receiving condition 4: the channel quality is obtained using
only part of the panels, and all or part of TXRUs in each of the
part of panels are used, those TXRUs may be single-polarized or
dual-polarized, as shown in FIG. 4d;
[0417] receiving condition 5: the channel quality is obtained by
the terminal based on using all TXRUs of all panels, as shown in
FIG. 4e.
[0418] In FIGS. 4a to 4e, beams used by different TXRUs may be in a
same direction or in different directions. At this time, different
TXRUs correspond to radio frequency beams at different horizontal
angles and/or vertical angles. This embodiment does not exclude a
same radio frequency beam corresponding to different TXRUs. Or, the
base station indicates that different TXRUs of the terminal should
use a same radio frequency beam to obtain channel quality
corresponding to a transmitting resource, or that different TXRUs
are allowed to use different radio frequency beams to obtain the
channel quality corresponding to the transmitting resource, i.e.,
the radio frequency beams used by the different TXRUs may be the
same or different at this time. Alternatively, the terminal is
configured by that base station to use different TXRUs with
different radio frequency beams to obtain the channel quality
corresponding to the transmitting beam.
[0419] If the base station assumes that the channel quality
reported by the terminal is based on the condition 3, the selection
criterion for the terminal to select M resources from the candidate
resource set may include traversing all beam combinations of TXRUs
to obtain the channel quality. At this time, according to the
number of TXRUs received by the receiving end, each TXRU may hit
one radio frequency beam in only one direction at each moment. It
is assumed that TXRU_num is the number of TXRUs at the receiving
end, Rx_Beam is the number of radio frequency beams corresponding
to one TXRU. If each TXRU corresponds to four radio frequency beams
(and radio frequency beams used in different polarization
directions are the same), the total number of receiving modes is
RxBeamMode_Num=(TXRU_num).sup.RX_Beam=12.sup.4. An equivalent
channel is formed by one receiving mode and one transmitting
resource. Similar to Table 1 in the embodiment 1, the number of
transmitting resources* RxBeamMode_Num matrix is formed. The
element in i-th row and j-th column is used for characterizing
channel quality of an equivalent channel formed by an i-th
transmitting resource and a j-th receiving mode. After this
equivalent matrix is obtained, M resources may be selected based on
one or more selection criteria in the embodiment 1.
[0420] Specifically, Table 1 is taken as an example. It is assumed
that channel quality in Table 1 is obtained based on a receiving
condition of the terminal in FIG. 4a, and that a same receiving
beam has same channel quality for different TXRUs. For the sake of
simplicity, it is assumed that the terminal has only one panel and
one polarization direction corresponds only two TXRUs on each
panel, situations of transmitting beam and receiving mode are shown
in Table 5 (where the receiving mode corresponds to a receiving
beam set and thus corresponds to receiving beams on two respective
receiving TXRUs).
TABLE-US-00008 TABLE 5 Transmitting Beam Receiving Beam Set (0, 1)
(0, 2) (0, 3) (1, 2) (1, 3) (1, 4) 0 13.78 16.36 12.33 11 6.97 9.55
1 18.80 17.22 10.10 16.74 9.62 8.04 2 9.49 9 2.54 15.35 8.89 8.40 3
19.29 13.62 17.93 13.51 17.82 12.15 4 16.13 16.13 16.51 13.12 13.50
13.50 5 5.20 6.56 8.02 2.06 3.52 4.88 6 16.49 15.06 17.50 15.55
17.99 16.56 7 10.76 1.73 1.76 9.65 9.68 0.65
[0421] In an embodiment, now a sum of receiving energy of all
transmitting beams in each receiving mode may be obtained, and then
an appropriate receiving mode is selected. Specifically, as shown
in Table 5, an energy sum of each column is obtained, and then an
appropriate column is selected to be the appropriate receiving
mode.
[0422] There are several manners for deciding which of receiving
condition 1 to receiving condition 5 (the receiving condition set
in here is only an example, this embodiment does not exclude other
receiving condition sets) should be used by the terminal according
to channel quality or channel state information of a transmitting
resource fed back by the terminal. In a first manner, the receiving
condition (i.e. a receiving state) of the terminal is agreed
through bidirectional transmission; in a second manner, the
terminal freely decides the receiving condition; in a third manner,
the base station notifies the terminal of the receiving condition;
and in a fourth manner, the base station and the terminal agree on
a receiving condition set that the terminal may use, and the
terminal decides a specific receiving condition itself for use. In
an embodiment, the terminal may feed back the selected receiving
condition to the base station.
[0423] Of course, this embodiment does not exclude other receiving
conditions. The channel state information may include one or more
of following information: a reference signal reception power
(RSRP), channel quality indication information (such as a CQI or
other channel quality measurement information), a precoding matrix
indication (PMI), and a rank indication (RI). After the base
station obtains the receiving state of the terminal corresponding
to these channel states, the base station may provide assistance
for candidate scheduling or beam training. For example, when a CQI
fed back by the terminal is based on a single receiving beam, if
the base station schedules the terminal to use multiple receiving
antennas for receiving signals, a schedulable MCS may be increased
to a certain extent in comparison with the case of CQI.
Embodiment 3
[0424] According to the determination of M in this embodiment, a
value of M may be obtained in at least one of following
manners.
[0425] Manner 1: The value of M is obtained through receiving
indication information of the base station. The indication
information includes the value of M.
[0426] Manner 2: The base station transmits indication information
or agrees on a channel quality threshold, so the number of
resources with channel quality greater than the channel quality
threshold forms the M. At this time, the value of M may be
different at different measurement moments, and a maximum value of
M may be further defined.
[0427] Manner 3: The base station notifies the maximum value M_Max
of M through a signaling or agrees on the maximum value M_Max of M,
and the terminal decides the value of M according the receiving
condition of the terminal.
[0428] Manner 4: The base station notifies the number of receiving
resources through a signaling or agrees on the number of receiving
resources, and the terminal selects a selection criterion according
to the embodiment 1 or embodiment 2 to form the value of M by the
number of selected resources.
[0429] Manner 5: The base station and the terminal agree that the
value of M is equal to the number of resources included in the
candidate resource set.
[0430] Manner 6: The base station and the terminal agree that the
value of M is obtained according the number of TXRUs corresponding
to the terminal.
[0431] Manner 7: The base station and the terminal agree that the
value of M is obtained according the number of panels corresponding
to the terminal.
Embodiment 4
[0432] The terminal selects M resources in the candidate resource
set according to a certain selection criterion. In this embodiment,
the terminal reports the value of M to the base station.
[0433] For example, resources are selected according to an agreed
threshold of channel quality, and the terminal obtains that channel
quality of all resources is less than the agreed threshold, that is
M=0, the terminal reports the value of M. M corresponding to
different report moments may be different, and it is agreed that M
is less than or equal to M_Max, where M_Max is a maximum value of
the number of the selected resources.
Embodiment 5
[0434] In this embodiment, the terminal reports a piece of resource
quantity information M3, where the resource quantity information M3
may not be equal to M, and M represents the number of the selected
resources.
[0435] For example, resources are selected based on whether channel
quality corresponding to the resources is greater than a
predetermined threshold. At this time, M3 represents the number of
resources with channel quality greater than the predetermined
threshold, and a reported number of resources is the number of M
resources with optimal channel quality. For example, the number of
resources with channel quality greater than the predetermined
threshold is large, while the maximum value M_Max of the reported
number of resources is relatively small, where M3 corresponds to
the number of resources with the channel quality greater than the
predetermined threshold and the reported number of resources is
M.
[0436] Alternatively, the number M3 of resources with channel
quality greater than the predetermined threshold in all candidate
resources is 0, and the reported resources are M resources with
optimal channel quality.
[0437] M is an integer less than or equal to M_Max, and M3 is less
than or equal to the number of resources included in the candidate
resource set.
Embodiment 6
[0438] In this embodiment, the terminal reports a channel quality
ordering of all resources in the candidate resource set and/or the
channel quality information of the selected M resources.
[0439] For example, the number of resources in the candidate
resource set is M_H, and an arrangement is obtained for the M_H
resources. Resources in the arrangement are sorted according to the
channel quality of the resources. For example, when M_H=6 and M=2,
feedback information of the terminal and the base station includes
at least one of following information: (5, 3, 1, 0, 4, 2); or
channel quality information corresponding to resource 5 and
resource 3.
[0440] (5, 3, 1, 0, 4, 2) indicates channel quality of resource
5.gtoreq.channel quality of resource 3.gtoreq.channel quality of
resource 1.gtoreq.channel quality of resource 0.gtoreq.channel
quality of resource 4.gtoreq.channel quality of resource 2.
Specific channel quality information corresponding to the resource
5 and resource 3 with the optimal channel quality is reported.
Embodiment 7
[0441] In this embodiment, R receiving resources corresponding to
the selected M resources are obtained, and a channel quality
ordering of all transmitting resources included in the M resources
for each of the R receiving resources is obtained and fed back to
the base station. Alternatively, an ordering of all transmitting
resources included in the M resources is fed back for a receiving
resource with optimal channel quality of all receiving resources,
where the ordering of the transmitting resources is sorted
according to channel quality.
[0442] As shown in Table 6, the candidate resource set includes 32
resources. For 8 transmitting resources and 4 receiving resources,
each element in Table 6 represents channel quality from a
corresponding transmitting resource to a corresponding receiving
resource. The transmitting resource may be a transmitting beam, and
the receiving resource may be a receiving beam. Resources with
optimal channel quality are selected by the terminal first to
obtain selected resources {(0, 3), (6, 0), (3, 0), (3, 1)}, where
(x, y) represents (transmitting beam x, receiving beam y), and the
terminal may report index information of the selected resources and
channel quality information of the selected resources to the base
station. It is also possible to report following information: the
receiving quality ordering of transmitting resources of {0, 6, 3}
in receiving beams of {3, 0, 1}. A transmitting resource with
better channel quality will rank higher in the ordering. For
example, {3, 0, 1} in receiving beam 3 has an ordering of {0, 6,
3}. The higher place in the ordering the corresponding transmitting
beam is, the better the channel quality of the corresponding
transmitting beam has for the corresponding receiving beam. Of
course, this embodiment does not exclude less channel quality with
a higher place of the corresponding receiving beam.
TABLE-US-00009 TABLE 6 Transmitting Beam Receiving Beam 0 1 2 3 0
1.38 2.19 3.54 4.79 1 0.23 1.90 3.77 1.70 2 0.49 3.82 1.38 2.92 3
4.12 3.97 3.39 1.11 4 3.47 0.93 3.27 3.75 5 1.58 2.44 0.81 1.27 6
4.75 2.22 0.59 2.52 7 0.17 3.23 2.49 3.49
[0443] That is, the feedback information from the terminal to the
base station at this time includes at least one of following
information: the channel state information of the selected M
resources, or the ordering of all transmitting resources
corresponding to the M resources for each receiving resource.
[0444] Specifically, this embodiment includes the channel quality
of 4 selected resources, i.e., the {(0, 3), (6, 0), (3, 0), (3,
1)}. Three orderings {0, 6, 3}, {6, 3, 0}, {3, 6, 0} represent
channel quality orderings for receiving beams of {3, 0, 1}
respectively. In this embodiment, only the ordering {0, 6, 3} is
reported, which indicates an ordering of these transmitting beams
for the receiving beam 3 (i.e., the receiving beam with optimal
channel quality).
Embodiment 8
[0445] In this embodiment, the terminal feeds back the number of
receiving resources corresponding to transmitting resources to the
base station.
[0446] In an embodiment, the number of receiving resources
corresponding to the transmitting resources indicates the number of
receiving resources capable of seeing the transmitting resources of
all receiving resources in the candidate resource set, or the
number of receiving resources capable of seeing the transmitting
resources among all receiving resources corresponding to the
selected resources. In an embodiment, if a transmitting resource
can be seen by a receiving resource, the channel quality of the
transmitting resource to the receiving resource needs to exceed a
predetermined threshold. This information may assist the base
station in determining transmission information in a subsequent
signal transmitting phase, transmission information includes at
least one of following information: the number of time division
resources required to transmit a transmitting resource, the number
of reference signal ports, a precoding polling period, or the
number of precoding resource units. The number of precoding units
represents the number of different precoding in precoding cycling.
The transmission information of the signals is determined in
following manners: one manner is to obtain the number of time
division resources in a beam measurement phase according to the
number of receiving resources fed back by the terminal; and the
other manner is to obtain the number of time division resources in
a next beam measurement phase according to the number of receiving
resources fed back by the terminal and the number of receiving
antennas of the terminal.
[0447] Specifically, for example, a transmitting resource is a
transmitting beam, and a receiving resource is a receiving beam.
There are 8 transmitting beams and 4 receiving beams, and thus 8*4
resources in total. Channel quality corresponding to these
resources is shown in Table 7. The terminal selects {(3, 0), (1,
0), (3, 1), (0, 0)} based on the selection criterion. Among the
selected resources, there are two receiving resources, there are
two receiving beams for the transmitting beam 3, and there is one
receiving beam for the transmitting beams of {0, 1}.
TABLE-US-00010 TABLE 7 Transmitting Beam Receiving Beam 0 1 2 3 0
9.57 4.21 6.79 2.76 1 9.64 9.16 7.58 0.46 2 1.57 7.92 7.43 0.97 3
9.70 9.59 3.92 8.23 4 9.57 6.56 6.56 6.94 5 4.85 0.35 1.71 3.17 6
8.00 8.49 7.06 9.50 7 1.42 9.34 0.31 0.34
[0448] In a manner of reporting the number of receiving resources,
the terminal feeds back the total number of receiving resources
included in the selected resources to the base station. At this
point, the base station may use this information to determine, for
signals transmitted to the terminal subsequently, at least one of
following information: the number of time division resources
occupied by the signals, the number of DMRS ports of the signals,
the number of polling codewords in precoding cycling of the
signals, or a polling period used in precoding cycling of the
signals.
[0449] Specifically, for example, if the number of receiving
resources reported by the terminal is two, then in a subsequent
communication phase, the base station may transmit time division
resources with an integral multiple of two to the terminal, thereby
allowing the receiving end to receive the signals using a
corresponding receiving mode and which will increase link
robustness. As shown in FIG. 8a, the base station may use two OFDM
symbols to transmit a PDCCH to the terminal, and the terminal uses
different receiving modes to receive the signals, which will
increase the robustness of the link. Alternatively, as shown in
FIG. 8b, the base station uses two time units to transmit the
signals to the terminal. Alternatively if a receiving resource
corresponds to a receiving beam and the terminal has more than one
receiving antennas, at this point the base station may determine
the number of DMRS ports transmitted to the terminal according to
the number of receiving resources, for example, the number of DMRS
ports is equal to an integral multiple of the number of receiving
resources, or the number of DMRS ports is equal to min(the number
of reported receiving resources, the number of receiving antennas
of the terminal), especially the number of DMRS ports used for
controlling channel demodulation is obtained according to above
information. Or, the number of polling codewords or the polling
period used in precoding cycling of the signals is determined
according to the reported number of receiving resources, as shown
in FIG. 8c or FIG. 8d. Each precoding represents a precoding group,
including one or more precoding vectors, or one or more beams.
[0450] In another manner of the number of receiving resources, the
terminal feeds back the number of receiving resources corresponding
to each transmitting resource in the selected resources to the base
station.
[0451] The signals in this embodiment include at least one of
following signals: a data channel signal, a control channel signal,
a measurement reference signal, or a demodulation reference
signal.
Embodiment 9
[0452] In this embodiment, the terminal reports the number of
receiving resources in a P-2 phase of the terminal corresponding to
one receiving resource in a P-1 phase of the terminal to the base
station. For example, the receiving beams are wide beams in the P-1
phase and narrow beams in the P-2 phase. At this time, a wide beam
corresponds to a plurality of narrow beams, the terminal needs to
transmit this information to the base station so as to facilitate
beam training in the P-2 phase, especially receiving beam
training.
[0453] A receiving beam may be equivalent to a receiving resource.
The receiving resource includes at least one of following
resources: a receiving beam resource, a receiving antenna resource,
a receiving port resource, a receiving frequency domain resource, a
receiving sequence resource, a receiving time domain resource, or a
receiving mode resource, where the port resource refers to a
reference signal port resource.
[0454] The number of receiving resources may be reported by the
terminal through capability information, or the terminal may report
according to its capability in different periods, i.e., the number
is variable.
Embodiment 10
[0455] In this embodiment, the rank information is configured by
the base station.
[0456] In an embodiment, the rank information is configured by the
base station in at least one of following manners.
[0457] In a first manner, the rank information is configured by the
base station when the candidate resource set is configured by the
base station (for example, the candidate resource set includes
CSI-RS resources).
[0458] In a second manner, the rank information is configured by
the base station when a second set related to the candidate
resource set is configured. The second set includes at least one of
following sets: a RS resource set, a CSI report setting, a
measurement set, or a link set, where a link includes a RS resource
set and a CSI report setting set.
[0459] In a third manner, the rank information is configured in CSI
process information.
[0460] In a fourth manner, the rank information may be configured
directly in a dynamic signaling.
[0461] In a fifth manner, the candidate resource set includes N
first sets, and a piece of rank information is configured in each
first set, the rank information may be different for different
first sets.
[0462] The rank information represents at least one of following
information.
[0463] A. The rank information represents the maximum number of
layers that the set or resource may support. Specifically, for
example, the set is a CSI-RS resource. When the rank information is
configured as 3, the rank information indicates that
channel-related measurement information, such as channel
throughput, may be obtained based on RI=1, 2, 3 according to this
CSI-RS, a selected RI with a maximum channel throughput is obtained
and the selected RI is reported to the base station. For example,
RI=2 is selected, and then RI=2 is reported to the base
station.
[0464] B. The rank information corresponding to the set is the
number of layers supported by the set. Specifically, for example,
the set is a CSI-RS resource. When the rank information
corresponding to the CSI-RS resource is configured as three, which
indicates that when a channel is measured based on this CSI-RS
resource, channel related measurement information, such as
throughput, may be obtained only based on RI=3.
[0465] In existing LTE, a maximum value of RI is obtained by the
terminal based on min(the number of CSI-RS ports, the number of
receiving antennas of the terminal). The value of RI fed back by
the terminal to the base station is less than or equal to the
maximum value of RI (hereinafter, the maximum value of RI is called
RI_max in short). At present, in a condition of a beam-based
transmission at high frequency, RI_max may not continue to be
obtained according to the min(the number of CSI-RS ports, the
number of receiving antennas of the terminal). Since different
ports of the base station for transmitting CSI-RS may use a same
beam, at this time the base station may instruct the terminal not
to obtain the RI_max according to the min(the number of CSI-RS
ports, the number of receiving antennas of the terminal). The rank
information configured by the signaling indicates a corresponding
RI_max supported by the set, and the RI (Rank Indication) reported
by the terminal is less than or equal to the RI_max. Alternatively,
the rank information indicates the number of layers supported by
the set, and the terminal obtains CSI information based on the
configured rank information and reports the CSI information to the
base station.
[0466] In first implementation for configuring the rank information
by the base station, the rank information is different for
different sets, the rank information indicates the number of layers
of each set, and then the terminal obtains the value of RI based on
a plurality of sets and reports it to the base station.
[0467] Specifically, as shown in FIG. 9a, three CSI-RS resources
are configured by the base station, and configuration information
of respective CSI-RS resource includes corresponding rank
information, which respectively corresponds to Rank=1, Rank=2,
Rank=3. The terminal obtains channel throughput of these three
CSI-RS resources based on the three CSI-RS resources and their
corresponding rank values, and then the value of RI is selected
according to a certain principle, such as maximizing channel
throughput, and the value of RI is reported to the base station.
Optionally the terminal implicitly reports the selected value of RI
by reporting index information of the CSI-RS resource at this
time.
[0468] In second implementation for configuring the rank
information by the base station, as shown in FIG. 9b, a rank
information set is configured in first configuration information of
a CSI-RS resource, the rank information set includes at least one
rank, and then a currently enabled rank of the CSI-RS resource is
configured in second configuration information of the CSI-RS
resource. In an embodiment, the configuration of the first
configuration information comes prior to the configuration of the
second configuration information. The second configuration
information only needs to be configured in a rank information set
of the first configuration information, and/or In an embodiment a
configuration period of the first configuration information is not
less than a configuration period of the second configuration
information.
[0469] In third implementation for configuring the rank
information, as shown in FIG. 9c, CSI-RS resources are configured
in the first configuration information, and the rank information
corresponding to the CSI-RS resources is directly configured in the
second configuration information.
[0470] In this embodiment, the configuration information is
notified in at least one of following manners: a RRC signaling, a
MAC CE signaling, or a DCI signaling.
[0471] In above implementation, the rank information corresponding
to a CSI-RS resource may be obtained based on all CSI-RS ports
included in the CSI-RS resource, for example, the CSI-RS resource
includes four CSI-RS ports, and a precoding matrix corresponding to
the rank information has a size of (the number of CSI-RS ports)*RI.
It is not excluded in this embodiment that, the rank information
may be obtained based on part of CSI-RS ports included in the
CSI-RS resource. For example, the CSI-RS resource includes four
CSI-RS ports, and a precoding matrix corresponding to the rank
information has a size of Tx1*RI, where Tx1 is less than or equal
to 4.
[0472] In implementation, the rank information is a maximum rank
value supported by the set, and correspondence exists between the
maximum rank value and the number of CSI-RS ports used in the
precoding matrix. For example, the CSI-RS resource includes eight
CSI-RS ports. If a signaling indicates that the rank information
corresponding to the CSI-RS resource is four, then the terminal is
based on top four CSI-RS ports (or based on four CSI-RS ports
obtained in other agreed manner, or through the signaling
notification to obtain which four of the eight CSI-RS ports in the
CSI-RS resource). Optionally, other CSI-RS ports in the CSI-RS
resource are used as interference measurement signals. For clarity,
that is, CSI-RS and CSI-IM are in a set this time, CSI-RS ports are
obtained through the rank information and other ports are all used
for CSI-IM ports. At this time, the CSI-RS resource may be referred
to as a RS resource, including eight RS ports, and ports for the
CSI-RS are determined according to the rank information configured
by the RS resource, and the rest ports in the RS resource are used
as CSI-IM ports.
Embodiment 11
[0473] In this embodiment, the terminal determines the dimension of
a second feedback information according to non-zero elements in a
first feedback information (or the number of elements in the first
feedback information with an absolute value greater than the
predetermined threshold), and/or determines the codebook
restriction set of the second feedback information.
[0474] For example, the precoding matrix fed back by the terminal
may be expressed as:
w r , l = B .times. P r , l .times. .times. C r , l = i = 0 L - 1
.times. b k 1 ( i ) .times. k 2 ( i ) .times. p r , l , i .times. c
r , l , i .times. .times. r = 0 , 1 , l = 0 , 1 , .times. , Lay - 1
( 1 ) ##EQU00001##
[0475] where r represents a polarization direction, l represents
layer index, Lay represents a total number of layers,
b.sub.k.sub.1.sub.(i).sub.k.sub.2.sub.(i) represents a vector,
which is a column vector with a dimension of (measurement reference
signal ports)*1 in a single polarization direction, or a column
vector with a dimension of (transmitting antennas)*1,
{b.sub.k.sub.1.sub.(i).sub.k.sub.2.sub.(i), i=0, 1, . . . , L-1}
may be a vector set (similar to WI in LTE) fed back by in a long
period of the terminal. Of course, the
{b.sub.k.sub.1.sub.(i).sub.k.sub.2.sub.(i), i=0, 1, . . . , L-1}
obtained by other ways is not excluded in this embodiment,
p.sub.r,l,i represents an amplitude weight of w.sub.r,l for an i-th
vector in the {b.sub.k.sub.1.sub.(i).sub.k.sub.2.sub.(i), i=0, 1, .
. . , L-1}, c.sub.r,l,i represents a phase compensation of
w.sub.r,l for an i-th vector in the
{b.sub.k.sub.1.sub.(i).sub.k.sub.2.sub.(i), i=0, 1, . . . , L-1}.
In an embodiment, B={b.sub.k.sub.1.sub.(i).sub.k.sub.2.sub.(i),
i=0, 1, . . . , L-1} is fed back through a wideband in a long
period of the terminal, P={p.sub.r,l,i, i=0, 1, . . . , L-1} and
C={c.sub.r,l,i, i=0, 1, . . . , L-1} are fed back through a
sub-band in a short period of the terminal. Equation (1) may be
equivalently converted into a following matrix:
w = [ W 1 0 0 W 1 ] .function. [ P 1 0 0 P 2 ] .function. [ C 1 C 2
] .times. .times. where ( 2 ) W 1 = [ b k 1 ( 0 ) .times. k 2 ( 0 )
b k 1 ( 1 ) .times. k 2 ( 1 ) b k 1 ( L - 1 ) .times. k 2 ( L - 1 )
] , ( 3 ) P r = diag .function. ( p r ) = diag .function. ( [ p r ,
l , 0 p r , l , 1 p r , l , L - 1 ] T ) , .times. r = 0 , 1 ( 4 ) C
r = [ c r , l , 0 c r , l , 1 c r , l , L - 1 ] T , .times. r = 0 ,
1 ( 5 ) ##EQU00002##
[0476] At this time, a dimension of C fed back by the terminal is
determined according to the number of non-zero elements in P, for
example, L=8, when the number of non-zero elements in P is four,
the dimension of C fed back by the terminal is 4*Lay, or PMI index
of C fed back by the terminal is codeword index in a 4*Lay
codebook. If numbers of non-zero elements in P corresponding to
different layers are different, the terminal may have different
dimensions of C corresponding to different layers at this time. For
each layer the dimension of C means the number of elements in the
C. Of course, the dimension of C in each layer may be determined to
be the same according to a certain rule (at this time, the
dimension of C represents the number of rows in C). On the other
hand, since the number of non-zero elements in P varies in a range
of [0, L], when C is fed back through a PMI (i.e., when the
codeword index of C in a codebook is fed back), the codebook may
not have all dimensions within a range of [1, L], but only some
limited numbers. Then at this time, the terminal searches for a
minimum dimension larger than the number of non-zero elements in P
of dimensions supported by the codebook (or the codebook dimension
of C is determined according to codebook dimensions supported by
other rules), such as L=8, and the codebook has a codebook with
transmitting antennas (or the number of measuring reference signal
ports) of {1, 4, 8}, and the number of non-zero elements in P is
three, then the PMI index of C fed back by the terminal is the
codeword index in the codebook with a transmitting antenna of {4}.
The base station obtains which i compensation phase corresponds to
the fed back C according to P fed back by the terminal, for
example:
[0477] p.sub.0=[0 1 0 0.5 0 1 0.8 0],C_feedback=[c.sub.f0 c.sub.f1
c.sub.f2 c.sub.f3].sup.T, the terminal obtains one of followings
from equation (5):
[0478] C.sub.0=[0 cf.sub.0 0 c.sub.f1 0 c.sub.f2 c.sub.f3 0].sup.T,
or
[0479] C.sub.0=[1 c.sub.f0 1 c.sub.f1 1 c.sub.f2 c.sub.f3 1].sup.T,
or
[0480] C.sub.0=[x c.sub.f0 x c.sub.f1 x c.sub.f3 x].sup.T;
[0481] where X has a fixed phase value, or the base station and the
terminal agree on the certain rule for a phase compensation without
feedback.
[0482] In the above embodiments, the dimension of C is determined
by the number of non-zero elements in P. This embodiment also does
not exclude that the dimension of C is determined by the
relationship between elements in P and the predetermined threshold,
for example, the dimension of C is determined by the number of
elements with a value greater than the predetermined threshold in
P.
[0483] Alternatively, another way of implementing this embodiment
is to determine a restriction set of C in codewords according to
the number of non-zero elements in P (or the number of elements
with the value greater than the predetermined threshold in P).
Specifically, for example, the dimension of C in the above equation
(1) to equation (5) is L. For example, if C is fed back through the
codewords, then different restriction sets of C in L-dimensional
codewords are obtained by different numbers of non-zero elements in
P (or different numbers of elements with the value greater than the
predetermined threshold in P). The terminal feeds back C according
to the restriction sets, for example, L=8, p.sub.0=[0 1 0 0.5 0 1
0.8 0], C_feedback corresponds to the number of rows of eight (i.e.
the C_feedback is located at a codebook with eight transmitting
measurement reference signal ports). However, selectable codewords
for the C_feedback are limited. Specifically, for example, a
codebook with the number of rows of eight (i.e., eight measurement
reference signal ports) includes a total of 256 codewords, while
selectable codewords for the C_feedback form a subset of the 256
codewords.
Embodiment 12
[0484] In this embodiment, M resources are selected by the terminal
according to the correlation degree of resources in the candidate
resource set, and/or difference intervals of channel quality of
resources in the candidate resource set, and/or an ordering of
channel quality of resources in the candidate resource set.
[0485] Specifically, the selection criterion may be at least one of
following criteria.
[0486] Selection criterion 1: The M resources are resources with a
minimum correlation degree in the candidate resource set. For
example, a channel corresponding to each resource is a Rx*Ty
channel response matrix (the Rx is the number of receiving
antennas, the Ty is the number of transmitting antennas, or the
number of transmitting reference signal ports), then a correlation
degree of two resources is a correlation degree of two matrices at
this point; in an embodiment Ty=1, the correlation degree of the
two resources is a correlation degree of vectors; in an embodiment
Rx=1, and Ty=1, the correlation degree of the two resources is a
correlation degree of two scalars, where the channel response
matrix (or channel response vector, or channel response scalar) may
be a frequency domain channel response, a time domain channel
response, an instantaneous channel response, or an average channel
response. In an embodiment, the correlation degree of vectors may
also be expressed by an angle between vectors. The smaller the
angle is, the greater the correlation degree is; while the greater
the angle is, the smaller the correlation degree is. Alternatively,
the correlation degree of vectors is represented by the cosine
value of the angle between vectors, i.e. the correlation degree of
A and B is represented by .rho.(A,B)=cos(.DELTA..theta.), where the
angle between vectors of A and B is represented as .DELTA..theta..
The greater a value of .rho.(A,B), the greater the correlation
degree; while the smaller the value of .rho.(A,B), the smaller the
correlation degree. Alternatively, the greater an absolute value of
.rho.(A,B), the greater the correlation degree; while the smaller
the absolute value of .rho.(A,B), the smaller the correlation
degree.
[0487] In an embodiment, the correlation degree of two complex
scalars may be represented by the angle between two-dimensional
vectors, each two-dimensional vector being derived from a scalar
using a form of (real part, imaginary part). The smaller the angle
is, the greater the correlation degree is; and the greater the
angle is, the smaller the correlation degree is. Specifically, for
example, two complex numbers are
a=r.sub.1e.sup.j.theta..sup.1,b=r.sub.2e.sup.j.theta..sup.2, the
correlation degree between those two is related to
.rho.(a,b)=cos(.theta..sub.1-.theta..sub.2). The greater .rho.(a,b)
is, the greater the correlation degree is; or, the greater an
absolute value of .rho.(a,b) is, the greater the correlation degree
is.
[0488] Selection criterion 2: The difference intervals of channel
quality of the M resources are greater than the predetermined
threshold. Each resource corresponds to channel quality (where the
channel quality may be a CQI, a RSRP, or other values), the channel
quality of the M resources at this time are agreed in sequence, and
differences of channel quality of the M resources are greater than
the predetermined threshold.
[0489] Selection criterion 3: The arrival time intervals of the M
resources are greater than the predetermined threshold.
Specifically, for example, a resource corresponds to a transmitting
beam and a receiving beam, and this channel response includes
arrival time, such as arrival time of a main path of multiple
paths, or arrival time of a first path, or average arrival time of
all paths.
[0490] Selection criterion 4: The M resources are resources with
the maximum time energy sum in the candidate set. A time energy sum
corresponding to a resource is a sum of products of arrival time
and signal energy of multiple paths corresponding to the resource.
Specifically, a resource corresponds to a transmitting beam and a
receiving beam. At this time, a channel response of a
transmitting-receiving beam pair has multiple paths in time domain,
each path corresponding to a channel response value. For example,
the number of multiple paths of the transmitting-receiving beam
pair is P. At this time, the time energy sum is a sum of products
of time and energy of all paths.
[0491] Selection criterion 5: The M resources are resources with
the maximum correlation degree in the candidate resource set. The
correlation degree of the resources is a correlation degree of
channel response corresponding to the resources, which is similar
as that described in selection criterion 1 and will not be repeated
here.
[0492] Selection criterion 6: The resources in the candidate
resource set are sorted according to channel quality, and one
resource is selected every predetermined number of resources to
obtain the M resources. Alternatively, the resources may be sorted
according to the channel quality from large to small, and then part
of the resources may be selected at intervals of a first
predetermined number of resources, and then the rest resources may
be selected at intervals of a second predetermined number of
resources, thereby M selected resources are obtained. For example,
the candidate resource set includes ten resources with an ordering
of {7, 1, 2, 3, 5, 6, 4, 8, 10, 9} according to channel quality.
First, {7, 2} are selected at an interval of one resource, and then
{6, 10} are selected at an interval of two resources (it should be
noted that at this point the resources are selected from the rest
of following resources in every two resources), and finally
resources of {7, 2, 6, 10} are obtained as selected resources. The
resources in the candidate resource set may also be further divided
into multiple parts, and resources are selected at intervals of a
different number of resources in each part.
[0493] Selection criterion 7: A first resource (such as a resource
with optimal channel quality) is selected in the candidate resource
set, then correlation degrees between other resources and the
selected resource are obtained, a second resource with a minimum
correlation degree of the selected resource in the candidate
resource set is selected, then a third resource with a minimum
correlation degree sum of correlation degrees with {the first
resource, the second resource} in resources after the selected
resources are removed from the candidate resource set, and then M
resources are selected by analogy.
[0494] Selection criterion 8: The selected M resources form a
matrix, which has a maximum rank of an equivalent matrix formed by
resources in the candidate resource set, or a minimum correlation
degree of vectors in the equivalent matrix. Specifically, for
example, each resource is represented by a vector, which represents
a receiving vector from a transmitting reference signal port to Rx
receiving antennas of a receiving end, i.e. the vector has a
dimension of 1*Rx, then the M resources form the equivalent M*Rx
matrix. It is assumed that the number of resources in the candidate
resource set is T_Total, the equivalent M*Rx matrix formed by the M
resources has a rank greater than or equal to a rank of any
equivalent matrix formed by M resources randomly selected from the
T_Total resources, or a correlation degree between row vectors of
the M*Rx equivalent matrix formed by the M resources is less than
or equal to a correlation degree between row vectors of any
equivalent matrix formed by M resources randomly selected from the
T_Total resources.
[0495] Selection criterion 9: The M resources are resources with
the correlation degree less than or equal to the predetermined
threshold in the candidate resource set, specifically, for example,
a first resource (such as the resource with the optimal channel
quality) from the candidate resource set is selected, and then
other resources are selected, correlation degrees between other
resources and the first resource are less than or equal to the
predetermined threshold.
[0496] Selection criterion 10: The M resources are resources with
the correlation degree less than or equal to the predetermined
threshold in the candidate resource set. For example, a first
resource (such as the resource with the optimal channel quality) in
the candidate resource set is selected, then a second resource is
selected, which has a correlation degree with the first resource
less than or equal to the predetermined threshold, then a third
resource is selected, the third resource has a correlation degree
of the first resource and the second resource less than or equal to
the predetermined threshold, and so on to obtain M resources.
[0497] Selection criterion 11: The M resources are resources with
the correlation degree less than or equal to the predetermined
threshold in the candidate resource set. Specifically, the
correlation degree between two resources of the M resources is less
than or equal to the predetermined threshold. In this embodiment,
the channel quality may be one of following information: a CQI, a
RSRP, or other channel quality characterization values.
Embodiment 13
[0498] In this embodiment, the equivalent matrix formed by the M
resources is implemented in a way that, if a resource corresponds
to a Rx*Tx matrix, the equivalent matrix formed by the M resources
is a matrix formed by stacking a number M of Rx*Tx matrices.
Specifically, for example, each resource is represented by a
vector, which represents a receiving vector from a transmitting
reference signal port to Rx receiving antennas of a receiving end,
i.e., the vector has a dimension of 1*Rx, then M resources form an
equivalent M*Rx matrix or an equivalent Rx*M matrix.
[0499] The equivalent matrix formed by the M resources is
implemented in another way that, the M resources include Rx
receiving resources and Tx transmitting resources in total (when
there may be overlap between transmitting resources or receiving
resources of different resources), then the equivalent matrix
corresponding to the M resources is a Rx*Tx matrix, each element of
the matrix representing a channel response from an i-th
transmitting resource to a j-th receiving resource.
Embodiment 14
[0500] In this embodiment, the indication information of the M
resources includes the indication information for grouping,
different groups satisfy following characteristics: correlation
degrees of resources in a same group are less than or equal to the
predetermined threshold; in an embodiment, correlation degrees of
resources in different groups are greater than the predetermined
threshold at this time.
[0501] Of course, in another embodiment, correlation degrees of
resources in a same group are greater than the predetermined
threshold; in an embodiment, correlation degrees of resources in
different groups are less than or equal to the predetermined
threshold at this time.
[0502] Where correlation degrees of resources in one group less
than or equal to the predetermined threshold may be selected
according to correlation degrees in embodiment 12, which are less
than or equal to the predetermined threshold, it will not be
repeated here.
Embodiment 15
[0503] In this embodiment the indication information of the M
resources includes the indication information for multi-level
grouping, resources in different level groups are quasi-co-located
concerning different types of channel characteristic parameter.
[0504] Specifically, for example, a first level group includes at
least one second level group, all resources in the first level
group are quasi-co-located concerning a first type channel
characteristic parameter, and all resources in one second level
group are quasi-co-located concerning a second type channel
characteristic parameter.
[0505] In an embodiment the first type and second type channel
characteristic parameters include at least one of following
characteristics: the first type channel characteristic parameter is
different from the second type channel characteristic parameter;
the first type channel characteristic parameter is a subset of the
second type channel characteristic parameter; one of the first type
channel characteristic parameter or the second type channel
characteristic parameter includes a channel characteristic
parameter of an average delay. For example, only the second type
channel characteristic parameter includes the parameter of the
average delay, while the first type channel characteristic
parameter does not include the parameter of the average delay.
[0506] In an embodiment, the first type channel characteristic
parameter includes at least one of following parameters: a
receiving panel, a transmitting panel, an average arrival angle, a
center arrival angle, an average angle extension, a vertical
average arrival angle, a horizontal average arrival angle, an
average departure angle, a center departure angle, a vertical
average departure angle, a horizontal average departure angle, a
multipath extension, or an average gain. In an embodiment,
resources in the first level group are not quasi-co-located at
least concerning following parameters: the average delay, a doppler
shift, and a doppler spread.
[0507] In an embodiment, the second type channel characteristic
parameter includes at least one of following parameters: a
receiving antenna, the average arrival angle, the center arrival
angle, the average angle extension, the vertical average arrival
angle, the horizontal average arrival angle, the average departure
angle, the center departure angle, the vertical average departure
angle, the horizontal average departure angle, the average delay,
the multipath extension, or the average gain. In an embodiment,
resources in the first level group are not quasi-co-located at
least concerning following parameters: the doppler shift and the
doppler spread.
[0508] In an embodiment, at this time, resources in the first level
group share a receiving panel, different second level groups in the
first level group correspond to different subarrays of a panel, or
different second level groups in the first level group correspond
to different sets of receiving beams of a panel.
[0509] In an embodiment, different second level groups in the first
level group correspond to different sets of receiving beams of a
panel, each panel may only generate a set of receiving beams at a
time, and different sets of receiving beams may only be generated
in time, for example, each TXRU of the panel corresponds to a
receiving beam. At this time, a receiving beam set may also be
referred to as a receiving mode of the panel.
[0510] In this embodiment, the two resources being quasi-co-located
concerning a type of channel characteristic parameters represents
that channel characteristic parameters of a resource may be
obtained or derived from channel characteristic parameters of the
other resource.
Embodiment 16
[0511] In this embodiment the M resources are selected according to
the correlation degree of resources and the channel quality of
resources.
[0512] Specifically, the channel quality of the M resources
satisfies the first predetermined condition and the correlation
degree of the M resources satisfies the second predetermined
condition. The first predetermined condition is one of following
conditions: the selected resources are Mx resources with optimal
channel quality in the candidate resource set, and Mx may be an
integer greater than or equal to M, or the selected resources are
resources with channel quality greater than the predetermined
threshold. The second predetermined condition includes one of
following conditions: the correlation degree is a minimum
correlation degree in a selectable resource set (the selectable
resource set is the candidate resource set or a subset of the
candidate resource set); the correlation degree of the selected
resources is less than the predetermined threshold; or the
correlation degree of the selected resources is 0, that is, the two
resources are orthogonal.
[0513] In a second selection manner, resources with channel quality
satisfying the first predetermined condition are first selected
from the candidate resource set, and then resources with a resource
correlation degree satisfying the second predetermined condition
are selected to obtain the M resources. The first predetermined
condition is one of following conditions: the selected resources
are Mx resources with optimal channel quality in the candidate
resource set, and Mx may be an integer greater than or equal to M,
or the selected resources are resources with channel quality
greater than the predetermined threshold. The second predetermined
condition includes one of following conditions: the correlation
degree is the minimum correlation degree in the selectable resource
set (the selectable resource set is the candidate resource set or a
subset of the candidate resource set); the correlation degree of
the selected resources is less than a predetermined threshold; or
the correlation degree of the selected resources is 0, that is, the
two resources are orthogonal.
[0514] In a third selection manner, resources with a resource
correlation degree satisfying the second predetermined condition
are first selected from the candidate resource set, and then
resources with channel quality satisfying the first predetermined
condition are selected from the selected resources to obtain the M
resources. The first predetermined condition is one of following
conditions: the selected resources are Mx resources with optimal
channel quality in the candidate resource set, and Mx may be an
integer greater than or equal to M, or the selected resources are
resources with channel quality greater than the predetermined
threshold. The second predetermined condition includes one of
following conditions: the correlation degree is the minimum
correlation degree in the selectable resource set; the correlation
degree of the selected resources is less than the predetermined
threshold; or the correlation degree of the selected resources is
0, that is, the two resources are orthogonal.
Embodiment 17
[0515] In this embodiment the M resources are selected according to
the correlation degree of resources, the channel quality of
resources and resources corresponding to receiving resources.
[0516] In the present disclosure resources in the candidate
resource set include at least one of following resources: a
transmitting beam resource, a transmitting antenna resource, a
transmitting port resource, a transmitting frequency domain
resource, a transmitting sequence resource, a transmitting time
domain resource, a transmitting mode resource, a receiving beam
resource, a receiving antenna resource, a receiving port resource,
a receiving frequency domain resource, a receiving sequence
resource, a receiving time domain resource, or a receiving mode
resource, where the port resources is a reference signal port
resource.
[0517] In the present disclosure transmitting resources include at
least one of following resources: a transmitting beam resource, a
transmitting antenna resource, a transmitting port resource, a
transmitting frequency domain resource, a transmitting sequence
resource, a transmitting time domain resource, a transmitting mode
resource, a transmitting panel resource, or a transmitting
process.
[0518] In the present disclosure receiving resources include at
least one of following resources: a receiving beam resource, a
receiving antenna resource, a receiving port resource, a receiving
frequency domain resource, a receiving sequence resource, a
receiving time domain resource, a receiving mode resource, a
receiving panel resource, or a receiving process.
[0519] In the disclosure the correlation degree of resources less
than the predetermined threshold may be implemented in a way that
the correlation degree of resources is less than the predetermined
threshold, and in another way that an absolute value of the
correlation degree of resources is less than the predetermined
threshold.
[0520] FIG. 6 is a schematic diagram of a device for feeding back
channel information according to an embodiment of the present
disclosure. As shown in FIG. 6 the device includes a determination
unit 601, a selection unit 602 and a transmitting unit 603.
[0521] The determination unit 601 is configured to determine a
candidate resource set.
[0522] The selection unit 602 is configured to select M resources
from the candidate resource set.
[0523] The transmitting unit 603 is configured to transmit at least
one of indication information or channel state information of the
selected M resources to a first communication node, where M is a
positive integer.
[0524] A selection criterion for selecting the M resources from the
candidate resource set is determined in at least one of following
manners: a selection criterion or a selection criterion set is
agreed with the first communication node, or a selection criterion
or a selection criterion set is obtained according to received
indication information transmitted by the first communication node,
and the selection criterion set includes at least one selection
criterion.
[0525] In an embodiment of the present disclosure the M resources
are selected according to at least one of following
information:
[0526] channel quality of resources;
[0527] a correlation degree of resources;
[0528] a receiving resource corresponding to resources;
[0529] a transmitting resource corresponding to resources;
[0530] an arrival time interval of resources; or
[0531] multipath characteristics corresponding to resources.
[0532] In an embodiment of the present disclosure the selection
criterion includes at least one of:
[0533] M resources with optimal channel quality are selected from
the candidate resource set as the M resources;
[0534] X1 resources with optimal channel quality are selected from
the candidate resource set, R1 receiving resources corresponding to
the X1 resources with the optimal quality are determined, and M
transmitting resources with optimal channel quality are selected
from all transmitting resources corresponding to the receiving
resources;
[0535] X1 resources with optimal channel quality are selected from
the candidate resource set, R1 receiving resources corresponding to
the X1 resources with the optimal quality are determined, channel
quality sum of each transmitting resource in the R1 receiving
resources is determined, and M transmitting resources with an
optimal channel quality sum are selected;
[0536] X2 resources with optimal channel quality are selected from
the candidate resource set, R2 receiving resources corresponding to
the X2 resources with the optimal channel quality are determined,
and at least one transmitting resource with optimal channel quality
for each of the R2 receiving resources is selected to form the M
resources;
[0537] an optimal receiving resource for each transmitting resource
is selected from the candidate resource set to obtain T resources,
and M resources with optimal channel quality are selected from the
T resources;
[0538] an optimal transmitting resource for each receiving resource
is selected from the candidate resource set to obtain R resources,
and M resources with optimal channel quality are selected from the
R resources;
[0539] M resources are selected from the candidate resource set,
the M resources form an equivalent channel with a maximum rank;
[0540] M resources are selected from the candidate resource set,
the M resources form an equivalent channel with a maximum channel
capacity;
[0541] R1 receiving resources and M transmitting resources are
selected from the candidate resource set, and an equivalent channel
formed by the M transmitting resources and the R1 receiving
resources has a channel matrix with a maximum rank;
[0542] R1 receiving resources and M transmitting resources are
selected from the candidate resource set, and an equivalent channel
formed by the M transmitting resources and the R1 receiving
resources has a channel matrix with a maximum channel capacity;
[0543] R1 receiving resources are selected from the candidate
resource set, and M1 resources with a minimum correlation degree of
channel response are selected for each of the R1 receiving
resources, and all resources selected for the R1 receiving
resources form the M resources;
[0544] the M resources are selected according to a correlation
degree of resources and channel quality of resources;
[0545] the M resources are selected according to the correlation
degree of resources;
[0546] the M resources with a difference interval of channel
quality greater than a predetermined threshold are selected;
[0547] the M resources with an arrival time interval greater than
the predetermined threshold are selected;
[0548] M resources with a maximum time energy sum are selected from
the candidate resource set, and a time energy sum corresponding to
a resource is a sum of products of arrival time and signal energy
of multiple paths corresponding to the resource;
[0549] M resources with a worst channel quality are selected from
the candidate resource set as the M resources; or
[0550] resources in the candidate resource set are sorted according
to channel quality of resources, and one resource in every
predetermined number of resources is selected to obtain the M
resources.
[0551] X1 and X2 are natural numbers less than or equal to N1, and
N1 is the number of resources included in the candidate resource
set; where R1, R2 and R are natural numbers less than or equal to
R_Total, and R_Total is the number of receiving resources included
in the candidate resource set; and T and M1 are natural numbers
less than or equal to T_Total, and T_Total is the number of
transmitting resources included in the candidate resource set.
[0552] In an embodiment of the present disclosure, the M resources
selected according to the correlation degree and the channel
quality of resources satisfy one of following characteristics:
[0553] channel quality of the M resources satisfies a first
predetermined condition and a correlation degree of the M resources
satisfies a second predetermined condition;
[0554] resources with channel quality satisfying the first
predetermined condition are selected from the candidate resource
set first, and then resources with a resource correlation degree
satisfying the second predetermined condition are selected to
obtain the M resources; or
[0555] resources with a resource correlation degree satisfying the
second predetermined condition are selected from the candidate
resource set first, and then resources with channel quality
satisfying the first predetermined condition are selected from the
selected resources to obtain the M resources.
[0556] In an embodiment of the present disclosure, the M resources
selected according to the correlation degree of resources satisfy
at least one of following characteristics:
[0557] the M resources are resources with a minimum correlation
degree in the candidate resource set;
[0558] the correlation degree of the M resources is less than or
equal to the predetermined threshold;
[0559] the M resources are composed of resources with a correlation
degree less than or equal to the predetermined threshold in the
candidate resource set; the correlation degree of any two of the M
resources is 0; or
[0560] the correlation degree of every two of the M resources has a
sum less than or equal to a sum of a correlation degree of every
two of resources in a first resource subset, where the first subset
is composed of any M resources in the candidate resource set.
[0561] In an embodiment of the present disclosure each resource of
the candidate resource set includes a transmitting resource and a
receiving resource.
[0562] In an embodiment of the present disclosure the M resources
comprise at least one of following characteristics:
[0563] the number of receiving resources included in the M
resources is less than or equal to M;
[0564] the number of transmitting resources included in the M
resources is less than or equal to M;
[0565] the M resources comprise a receiving resource and M
transmitting resources;
[0566] the M resources comprise M receiving resources and a
transmitting resource;
[0567] the M resources comprise M receiving resources and M
transmitting resources;
[0568] one or more transmitting resources of the M resources
sharing a receiving resource have a minimum correlation degree
among all correlation degrees of all transmitting resources sharing
the receiving resource;
[0569] a channel response matrix of an equivalent channel formed by
receiving resources and transmitting resources of the M resources
has a maximum rank; or
[0570] a channel response matrix of an equivalent channel formed by
the receiving resources and the transmitting resources of the M
resources has a maximum channel capacity.
[0571] In an embodiment of the present disclosure a value of M is
determined in at least one of following manners:
[0572] the indication information carrying the value of M
transmitted by the first communication node is received;
[0573] the value of M is determined according to channel quality
threshold agreed with the first communication node;
[0574] the value of M is determined according to a threshold for
correlation between resources agreed with the first communication
node;
[0575] the value of M is determined according to M_Max, where M_Max
is a value agreed with the first communication node, and the value
of M agreed with the first communication node is less than or equal
to the M_Max;
[0576] the value of M is determined according to the number of
receiving resources;
[0577] it is agreed with the first communication node that the
value of M value is equal to the number of resources included in
the candidate resource set;
[0578] the value of M is determined according to the number of
receiving antennas; or
[0579] the value of M is determined according to the number of
receiving panels.
[0580] In an embodiment of the present disclosure, the indication
information transmitted by the first communication node carries a
feedback type, and the selection criterion is obtained according to
the feedback type; or,
[0581] the indication information transmitted by the first
communication node carries feature types satisfied by the M
resources, and the selection criterion is obtained according to the
feature types.
[0582] In an embodiment of the present disclosure, the indication
information of the M resources includes index information of
transmitting resources and quantity information of receiving
resources; or,
[0583] the indication information of the M resources includes the
index information of transmitting resources and quantity
information of receiving resources corresponding to each
transmitting resource.
[0584] In an embodiment of the present disclosure, the candidate
resource set includes one of following characteristics:
[0585] the candidate resource set includes N first sets, where each
first set corresponds to a piece of rank information, and N is a
natural number;
[0586] the candidate resource set corresponds to a piece of rank
information; or
[0587] the rank information is included in configuration
information of a second set related to the candidate resource
set.
[0588] In an embodiment of the present disclosure the rank
information includes one of following characteristics:
[0589] the rank information is obtained through the indication
information transmitted by the first communication node;
[0590] the rank information corresponding to a set represents the
maximum number of layers supported by the set;
[0591] the rank information corresponding to a set represents the
number of layers supported by the set;
[0592] selected rank information is obtained according to the N
first sets, and is fed back to the first communication node; or
[0593] the selected rank information is fed back implicitly through
feeding back set index information of the N first sets.
[0594] In an embodiment of the present disclosure, the second set
includes at least one of: a CSI report setting, a CSI measurement
set, or a connection set, where the CSI measurement set includes at
least one connection, and each connection includes a resource set
and a report setting.
[0595] In an embodiment of the present disclosure, X1 is equal to 1
and/or X2 is equal to 1.
[0596] Each of R1, R2 and R is equal to an integral multiple of the
number of receiving antennas.
[0597] In an embodiment of the present disclosure, the channel
state information of the M resources includes at least one of
following characteristics:
[0598] channel quality information of each of the M resources is
fed back;
[0599] channel quality of a resource with optimal channel quality
in the M resources is fed back;
[0600] channel quality of a resource with worst channel quality in
the M resources is fed back; or
[0601] average channel quality of the M resources is fed back.
[0602] In an embodiment of the present disclosure the indication
information of the M resources includes at least one of following
characteristics:
[0603] resources are sorted according to channel quality of the
resources in the indication information of the M resources;
[0604] the M resources comprise all resources of the candidate
resource set;
[0605] the indication information of the M resources includes the
value of M;
[0606] the indication information of the M resources further
includes indication information of the selection criterion, where
the M resources are obtained based on the selection criterion;
[0607] the indication information of the M resources includes
indication information for grouping; or
[0608] the indication information of the M resources includes
indication information for multi-level grouping.
[0609] In an embodiment of the present disclosure, the grouping
includes at least one of following characteristics:
[0610] resources in a first level group are quasi-co-located
concerning a first type channel characteristic parameter;
[0611] resources in a second level group are quasi-co-located
concerning a second type channel characteristic parameter;
[0612] resources in a same group have a correlation degree less
than or equal to a predetermined threshold; or
[0613] resources in different groups have a correlation degree
greater than the predetermined threshold.
[0614] In an embodiment of the present disclosure the first type
and second type channel characteristic parameters comprise at least
one of following characteristics:
[0615] the first type channel characteristic parameter is different
from the second type channel characteristic parameter;
[0616] the first type channel characteristic parameter is a subset
of the second type channel characteristic parameter; and
[0617] one of the first type channel characteristic parameter or
the second type channel characteristic parameter includes a channel
characteristic parameter of an average delay.
[0618] The first type channel characteristic parameter includes at
least one of following parameters: a receiving panel, a
transmitting panel, an average arrival angle, a center arrival
angle, an average angle extension, a vertical average arrival
angle, a horizontal average arrival angle, an average departure
angle, a center departure angle, a vertical average departure
angle, a horizontal average departure angle, a multipath extension,
or an average gain; and
[0619] the second type channel characteristic parameter includes at
least one of following parameters: a receiving antenna, the average
arrival angle, the center arrival angle, the average angle
extension, the vertical average arrival angle, the horizontal
average arrival angle, the average departure angle, the center
departure angle, the vertical average departure angle, the
horizontal average departure angle, the average delay, the
multipath extension, or the average gain.
[0620] In an embodiment of the present disclosure the indication
information transmitted by the first communication node includes at
least one of following indication information:
[0621] indication information of a RRC signaling;
[0622] indication information of a MAC CE signaling; or
[0623] indication information of a DCI signaling.
[0624] Those skilled in the art should understand that
implementation of functions of each unit in the device for feeding
back channel information shown in FIG. 6 may be understood with
reference to the above-mentioned description of the method for
feeding back channel information.
[0625] The embodiments of the present disclosure also provide a
device for feeding back channel information, which includes one or
more processors (the processors may include, but are not limited
to, a processing device such as a microprocessor (MCU), a
programmable logic device (FPGA) and other processing devices), a
memory for storing data, and a transmitting device for
communication functions. One of ordinary skill in the art may
understand that the device for feeding back channel information may
also include more or fewer components. The memory in the device for
feeding back channel information stores each unit in the device for
feeding back channel information shown in FIG. 6.
[0626] In the embodiments of the present disclosure, a device for
feeding back channel information is further provided. The device
includes a determination unit and a transmitting unit.
[0627] The determination unit is configured to determine the number
of receiving resources.
[0628] The transmitting unit is configured to transmit the number
of the receiving resources to a first communication node.
[0629] In an embodiment, the number of the receiving resources has
a relationship with at least one of following information:
[0630] the number of time domain units required for transmitting
the signal, the signal is transmitted by the first communication
node after the first communication node receives feedback
information;
[0631] the number of reference signal ports;
[0632] the number of precoding polling periods; or
[0633] the number of precoding units.
[0634] In an embodiment, the receiving resources comprise one of
following characteristics:
[0635] the number of the receiving resources is the number of
receiving resources corresponding to a transmitting resource;
[0636] the number of the receiving resources is the number of
receiving resources corresponding to more than one transmitting
resources; or
[0637] the number of the receiving resources is the number of
receiving resources corresponding to a second receiving
resource.
[0638] FIG. 7 is a schematic structural diagram of a device for
receiving channel information according to an embodiment of the
present disclosure. As shown in FIG. 7 the device includes a
receiving unit 701.
[0639] The receiving unit is configured to receive at least one of
indication information or channel state information of M resources
transmitted by a second communication node. The M resources are
selected by the second communication node.
[0640] The M resources are obtained from a candidate resource set
by the second communication node based on a selection criterion,
the selection criterion includes at least one of following
characteristics: a selection criterion or a selection criterion set
is agreed with the second communication node, or the indication
information including the selection criterion or the selection
criterion set is transmitted to the second communication node. The
selection criterion set includes at least one selection
criterion.
[0641] In an embodiment of the present disclosure the M resources
are selected according to at least one of following
information:
[0642] channel quality of resources;
[0643] a correlation degree of resources;
[0644] a receiving resource corresponding to resources;
[0645] a transmitting resource corresponding to resources;
[0646] an arrival time interval of resources; or
[0647] multipath characteristics corresponding to resources.
[0648] In an embodiment of the present disclosure, the selection
criterion includes at least one of:
[0649] M resources with optimal channel quality are selected from
the candidate resource set as the M resources;
[0650] X1 resources with optimal channel quality are selected from
the candidate resource set, R1 receiving resources corresponding to
the X1 resources with the optimal quality are determined, and M
transmitting resources with optimal channel quality are selected
from all transmitting resources corresponding to the receiving
resources;
[0651] X1 resources with optimal channel quality are selected from
the candidate resource set, R1 receiving resources corresponding to
the X1 resources with the optimal quality are determined, channel
quality sum of each transmitting resource in the R1 receiving
resources is determined, and M transmitting resources with an
optimal channel quality sum are selected;
[0652] X2 resources with optimal channel quality are selected from
the candidate resource set, R2 receiving resources corresponding to
the X2 resources with the optimal channel quality are determined,
and at least one transmitting resource with optimal channel quality
for each of the R2 receiving resources is selected to form the M
resources;
[0653] an optimal receiving resource for each transmitting resource
is selected from the candidate resource set to obtain T resources,
and M resources with optimal channel quality are selected from the
T resources;
[0654] an optimal transmitting resource for each receiving resource
is selected from the candidate resource set to obtain R resources,
and M resources with optimal channel quality are selected from the
R resources;
[0655] M resources are selected from the candidate resource set,
where the M resources form an equivalent channel with a maximum
rank;
[0656] M resources are selected from the candidate resource set,
where the M resources form an equivalent channel with a maximum
channel capacity;
[0657] R1 receiving resources and M transmitting resources are
selected from the candidate resource set, where an equivalent
channel formed by the M transmitting resources and the R1 receiving
resources has a channel matrix with a maximum rank;
[0658] R1 receiving resources and M transmitting resources are
selected from the candidate resource set, where an equivalent
channel formed by the M transmitting resources and the R1 receiving
resources has a channel matrix with a maximum channel capacity;
[0659] R1 receiving resources are selected from the candidate
resource set, and M1 resources with a minimum correlation degree of
channel response are selected for each of the R1 receiving
resources, where all resources selected for the R1 receiving
resources form the M resources;
[0660] the M resources according to a correlation degree of
resources and channel quality of resources are selected;
[0661] the M resources according to the correlation degree of
resources are selected;
[0662] the M resources with a difference interval of channel
quality greater than a predetermined threshold are selected;
[0663] the M resources with an arrival time interval greater than
the predetermined threshold are selected;
[0664] M resources with a maximum time energy sum are selected from
the candidate resource set, where a time energy sum corresponding
to a resource is a sum of products of arrival time and signal
energy of multiple paths corresponding to the resource;
[0665] M resources with a worst channel quality from the candidate
resource set are selected as the M resources; or
[0666] resources in the candidate resource set are sorted according
to channel quality of resources, and one resource in every
predetermined number of resources is selected to obtain the M
resources.
[0667] X1 and X2 are natural numbers less than or equal to N1, and
N1 is the number of resources included in the candidate resource
set; and R1, R2 and R are natural numbers less than or equal to
R_Total, and R_Total is the number of receiving resources included
in the candidate resource set; where T and M1 are natural numbers
less than or equal to T_Total, and T_Total is the number of
transmitting resources included in the candidate resource set.
[0668] The candidate resource set is agreed in advance with the
second communication node, each resource in the candidate resource
set includes a transmitting resource and a receiving resource.
[0669] In an embodiment of the present disclosure, the selection of
the M resources according to the correlation degree and the channel
quality of resources satisfy one of following characteristics:
[0670] channel quality of the M resources satisfies a first
predetermined condition and a correlation degree of the M resources
satisfies a second predetermined condition.
[0671] resources with channel quality satisfying the first
predetermined condition are selected from the candidate resource
set first, and then resources with a resource correlation degree
satisfying the second predetermined condition are selected from the
selected resources to obtain the M resources; or
[0672] resources with a resource correlation degree satisfying the
second predetermined condition are selected from the candidate
resource set first, and then resources with channel quality
satisfying the first predetermined condition are selected from the
selected resources to obtain the M resources.
[0673] In an embodiment of the present disclosure, the M resources
selected according to the correlation degree of resources satisfy
at least one of following characteristics:
[0674] the M resources are M resources with a minimum correlation
degree in the candidate resource set;
[0675] the correlation degree of the M resources is less than or
equal to the predetermined threshold;
[0676] the M resources are composed of resources with a correlation
degree less than or equal to the predetermined threshold in the
candidate resource set; the correlation degree of any two resources
of the M resources is 0; or
[0677] the correlation degree of every two resources of the M
resources has a sum less than or equal to a sum of a correlation
degree of every two of resources in a first resource subset, where
the first subset is composed of any M resources in the candidate
resource set.
[0678] In an embodiment of the present disclosure, the M resources
comprise at least one of following characteristics:
[0679] the number of receiving resources included in the M
resources is less than or equal to M;
[0680] the number of transmitting resources included in the M
resources is less than or equal to M;
[0681] the M resources comprise a receiving resource and M
transmitting resources;
[0682] the M resources comprise M receiving resources and a
transmitting resource;
[0683] the M resources comprise M receiving resources and M
transmitting resources;
[0684] one or more transmitting resources of the M resources
sharing a receiving resource have a minimum correlation degree
among all correlation degrees of all transmitting resources sharing
the receiving resource;
[0685] a channel response matrix of an equivalent channel formed by
receiving resources and transmitting resources of the M resources
has a maximum rank; or
[0686] a channel response matrix of an equivalent channel formed by
the receiving resources and the transmitting resources of the M
resources has a maximum channel capacity.
[0687] In an embodiment of the present disclosure M-related
information is determined and/or notified in at least one of
following manners:
[0688] indication information carrying a value of M is transmitted
to the second communication node;
[0689] indication information carrying threshold information of
channel quality is transmitted to the second communication
node;
[0690] indication information carrying threshold information of a
resource correlation degree is transmitted to the second
communication node;
[0691] indication information carrying M_Max to the second
communication node is transmitted, where the value of M agreed with
the second communication node is less than or equal to M_Max;
[0692] the value of M is determined according to the number of
receiving resources;
[0693] it is agreed with the second communication node that the
value of M is equal to the number of resources included in the
candidate resource set;
[0694] the value of M is determined according to the number of
receiving antennas of the second communication node; or
[0695] the value of M is determined according to the number of
receiving panels of the second communication node.
[0696] In an embodiment of the present disclosure the indication
information transmitted to the second communication node carries a
feedback type, and the selection criterion is notified through the
feedback type; or,
[0697] the indication information transmitted to the second
communication node carries feature types satisfied by the M
resources, and the selection criterion is notified through the
feature types.
[0698] In an embodiment of the present disclosure, the indication
information of the M resources includes index information of
transmitting resources and quantity information of receiving
resources; or,
[0699] the indication information of the M resources includes the
index information of transmitting resources and quantity
information of receiving resources corresponding to each
transmitting resource.
[0700] In an embodiment of the present disclosure the candidate
resource set includes one of following characteristics:
[0701] the candidate resource set includes N first sets, where each
first set corresponds to a piece of rank information, and N is a
natural number;
[0702] the candidate resource set corresponds to a piece of rank
information; or
[0703] the rank information is included in configuration
information of a second set related to the candidate resource
set.
[0704] In an embodiment of the present disclosure the rank
information includes one of following characteristics:
[0705] the rank information is configured through the indication
information transmitted to the second communication node;
[0706] the rank information corresponding to a set represents the
maximum number of layers supported by the set;
[0707] the rank information corresponding to a set represents the
number of layers supported by the set;
[0708] the second communication node is configured to obtain
feedback information of a rank indication (RI) according to the N
first sets; or
[0709] index information of the N first sets fed back by the second
communication node is received to obtain a value of the RI selected
by the second communication node.
[0710] In an embodiment of the present disclosure, the second set
includes at least one of: a CSI report setting, a CSI measurement
set, or a connection set, where the CSI measurement set includes at
least one connection, and each connection includes a resource set
and a report setting.
[0711] In an embodiment of the present disclosure, the X1 is equal
to 1 and/or the X2 is equal to 1.
[0712] Each of R1, R2 and R is equal to an integral multiple of the
number of receiving antennas.
[0713] In an embodiment of the present disclosure, the channel
state information of the M resources includes at least one of
following characteristics:
[0714] channel quality information of each of the M resources is
fed back;
[0715] channel quality of a resource with optimal channel quality
in the M resources is fed back;
[0716] channel quality of a resource with worst channel quality in
the M resources is fed back; or
[0717] average channel quality of the M resources is fed back.
[0718] In an embodiment of the present disclosure, the indication
information of the M resources includes at least one of following
characteristics:
[0719] resources are sorted according to channel quality of the
resources in the indication information of the M resources;
[0720] the M resources comprise all resources of the candidate
resource set;
[0721] the indication information of the M resources includes the
value of M;
[0722] the indication information of the M resources further
includes indication information of the selection criterion, where
the M resources are obtained based on the selection criterion;
[0723] the indication information of the M resources includes
indication information for grouping; or
[0724] the indication information of the M resources includes
indication information for multi-level grouping.
[0725] In an embodiment of the present disclosure the grouping
includes at least one of following characteristics:
[0726] resources in a first level group are quasi-co-located
concerning a first type channel characteristic parameter;
[0727] resources in a second level group are quasi-co-located
concerning a second type channel characteristic parameter;
[0728] resources in a same group have a correlation degree less
than or equal to a predetermined threshold; or
[0729] resources in different groups have a correlation degree
greater than the predetermined threshold.
[0730] In an embodiment of the present disclosure the first type
and second type channel characteristic parameters comprise at least
one of following characteristics:
[0731] the first type channel characteristic parameter is different
from the second type channel characteristic parameter;
[0732] the first type channel characteristic parameter is a subset
of the second type channel characteristic parameter; or
[0733] one of the first type channel characteristic parameter or
the second type channel characteristic parameter includes a channel
characteristic parameter of an average delay.
[0734] The first type channel characteristic parameter includes at
least one of following parameters: a receiving panel, a
transmitting panel, an average arrival angle, a center arrival
angle, an average angle extension, a vertical average arrival
angle, a horizontal average arrival angle, an average departure
angle, a center departure angle, a vertical average departure
angle, a horizontal average departure angle, a multipath extension,
or an average gain; and
[0735] the second type channel characteristic parameter includes at
least one of following parameters: a receiving antenna, the average
arrival angle, the center arrival angle, the average angle
extension, the vertical average arrival angle, the horizontal
average arrival angle, the average departure angle, the center
departure angle, the vertical average departure angle, the
horizontal average departure angle, the average delay, the
multipath extension, or the average gain.
[0736] In an embodiment of the present disclosure, the indication
information transmitted to the second communication node includes
at least one of following indication information:
[0737] indication information of a RRC signaling;
[0738] indication information of a MAC CE signaling; or
[0739] indication information of a DCI signaling.
[0740] In an embodiment of the present disclosure, indication
information for notifying of the selection criterion includes
receiving state type information of the second communication node
corresponding to the channel state information of the second
communication node; and/or,
[0741] the channel state information fed back by the second
communication node is received, and receiving state information of
the second communication node corresponding to the channel state
information of the second communication node is determined.
[0742] In an embodiment of the present disclosure, the channel
state information reported by the second communication node is
received, and a correspondence between the channel state and a
receiving state of the second communication node includes at least
one of:
[0743] the channel state is obtained by the second communication
node using one receiving beam of one TXRU;
[0744] the channel state is obtained by the second communication
node using all TXRUs of one panel;
[0745] the channel state is obtained by the second communication
node using part of panels, where all TXRUs in each of the part of
panels are used;
[0746] the channel state is obtained by the second communication
node using part of panels, where all or part of TXRUs in each of
the part of panels are used; or
[0747] the channel state is obtained by the second communication
node using all TXRUs of all panels.
[0748] In an embodiment of the present disclosure, each resource of
the candidate resources may include a transmitting resource and a
receiving resource, or only include a transmitting resource, i.e.
the receiving resources corresponding to each candidate resource
are the same at this time.
[0749] Those skilled in the art should understand that
implementation functions of each unit in the device for receiving
channel information shown in FIG. 7 may be understood with
reference to the above-mentioned description of the method for
receiving channel information.
[0750] The embodiments of the present disclosure also provide a
device for receiving channel information, which includes one or
more processors (the processors may include, but are not limited
to, a processing device such as a microprocessor (MCU), a
programmable logic device (FPGA), a memory for storing data, and a
transmission device for communication functions. One of ordinary
skill in the art may understand that the device for receiving
channel information may also include more or fewer components. The
memory in the device for feeding back channel information stores
each unit in the device for receiving channel information shown in
FIG. 7.
[0751] In an embodiment of the present disclosure, a device for
feeding back channel information is provided, the device includes a
receiving unit.
[0752] The receiving unit is configured to receive feedback
information transmitted by a second communication node, where the
feedback information includes the number of receiving
resources.
[0753] The device further includes a determination unit.
[0754] The determination unit is configured to determine
transmission information of a signal, according to the feedback
information transmitted by the second communication node, the
signal is transmitted to the second communication node after the
first communication node receives the feedback information.
[0755] In an embodiment, the transmission information includes at
least one of following information:
[0756] the number of time domain units required for transmitting
signals;
[0757] the number of reference signal ports;
[0758] a precoding polling period; or
[0759] the number of precoding units.
[0760] In an embodiment, the number of the receiving resources has
a relationship with at least one of following information:
[0761] the number of time domain units required by signals, where
the signals are signals transmitted by the first communication node
after the first communication node receives feedback
information;
[0762] the number of reference signal ports;
[0763] a precoding polling period; or
[0764] the number of precoding units.
[0765] In an embodiment, the receiving resources comprise one of
following characteristics:
[0766] the number of the receiving resources is the number of
receiving resources corresponding to a transmitting resource;
[0767] the number of the receiving resources is the number of
receiving resources corresponding to more than one transmitting
resources; or
[0768] the number of the receiving resources is the number of
receiving resources corresponding to a second receiving
resource.
[0769] Those skilled in the art will appreciate that embodiments of
the present disclosure may be provided as methods, systems, or
computer program products. Therefore, the present disclosure may
take a form of hardware embodiments, software embodiments, or
embodiments combining software and hardware aspects. Furthermore,
the present disclosure may take a form of computer program products
implemented on one or more computer usable storage media
(including, but not limited to, a magnetic disk storage, an optical
storage, etc.) with computer usable program codes embodied
therein.
[0770] The present disclosure is described with reference to
flowcharts and/or block diagrams of methods, apparatus (systems),
and computer program products according to the embodiments of the
present disclosure. It should be understood that each flow and/or
block in the flowchart and/or block diagram, and combinations of
flows in the flowcharts and/or blocks in the block diagrams, may be
implemented by computer program instructions. These computer
program instructions may be provided to a processor of a general
purpose computer, special purpose computer, embedded processor, or
other programmable data processing apparatus to produce a machine,
such that the instructions executed by the processor of the
computer or other programmable data processing apparatus produce
means for implementing functions specified in a flow or flows of
flowcharts and/or a block or blocks of block diagrams.
[0771] These computer program instructions may also be stored in a
computer-readable memory that may direct a computer or other
programmable data processing apparatus to function in a particular
manner, such that the instructions stored in the computer-readable
memory produce an article of manufacture including instruction
means that implement the functions specified in a flow or flows of
flowcharts and/or a block or blocks of block diagrams.
[0772] These computer program instructions may also be loaded onto
a computer or other programmable data processing apparatus, so that
a series of operational steps are performed on the computer or
other programmable apparatus to produce a computer implemented
process, the instructions that execute on the computer or other
programmable apparatus provide steps for implementing the functions
specified in a flow or flows of flowcharts and/or a block or blocks
of block diagrams.
[0773] Correspondingly, the embodiments of the disclosure also
provides a computer storage medium in which computer programs are
stored, which is configured to execute the method for feeding back
channel information or the method for receiving channel information
of an embodiments of the disclosure.
* * * * *