U.S. patent application number 15/901267 was filed with the patent office on 2018-06-28 for method and device for reporting channel quality information.
This patent application is currently assigned to DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD.. The applicant listed for this patent is DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD.. Invention is credited to Qiubin GAO, Zukang SHEN, Xin SU, Shaohui SUN, Rakesh TAMRAKAR.
Application Number | 20180184318 15/901267 |
Document ID | / |
Family ID | 46024006 |
Filed Date | 2018-06-28 |
United States Patent
Application |
20180184318 |
Kind Code |
A1 |
SU; Xin ; et al. |
June 28, 2018 |
METHOD AND DEVICE FOR REPORTING CHANNEL QUALITY INFORMATION
Abstract
Measuring a Channel State Information-Reference Signal (CSI-RS)
according to configuration information of the CSI-RS, to acquire a
downlink channel transport matrix. Determining a Channel Quality
Indicator (CQI) of a frequency domain reporting unit, according to
a number of CSI-RS ports and the corresponding transmission scheme
of a Physical Downlink Shared Channel (PDSCH) used when determining
the CQI, and the downlink channel transport matrix being acquired
by a measurement, Reporting the determined CQI to a network
side.
Inventors: |
SU; Xin; (Beijing, CN)
; GAO; Qiubin; (Beijing, CN) ; TAMRAKAR;
Rakesh; (Beijing, CN) ; SHEN; Zukang;
(Beijing, CN) ; SUN; Shaohui; (Beijing,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD. |
Beijing |
|
CN |
|
|
Assignee: |
DATANG MOBILE COMMUNICATIONS
EQUIPMENT CO., LTD.
Beijing
CN
|
Family ID: |
46024006 |
Appl. No.: |
15/901267 |
Filed: |
February 21, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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14002106 |
Aug 28, 2013 |
9936410 |
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15901267 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 1/0026 20130101;
H04L 1/20 20130101; H04B 7/0626 20130101; H04B 7/0632 20130101;
H04W 24/10 20130101 |
International
Class: |
H04W 24/10 20090101
H04W024/10; H04L 1/00 20060101 H04L001/00; H04B 7/06 20060101
H04B007/06 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 5, 2010 |
CN |
201010537846.0 |
Claims
1. A method for reporting channel quality information, the method
using non-Precoding Matrix Indicator (non-PMI) feedback for a
transmission mode, the method comprising: measuring, by a User
Equipment (UE), a Channel State Information-Reference Signal
(CSI-RS) according to configuration information of the CSI-RS, to
acquire a downlink channel transport matrix; determining, by the
UE, a Channel Quality Indicator (CQI) of a frequency domain
reporting unit, according to a number of CSI-RS ports and the
corresponding transmission scheme of a Physical Downlink Shared.
Channel (PDSCH) used when determining the CQI, and the downlink
channel transport matrix being acquired by a measurement; and
reporting, by the UE, the determined CQI to a network side, wherein
the transmission scheme of the PDSCH comprises: the PDSCH is
assumed to be transmitted through single-port when the number of
CSI-RS ports is 1, and the PDSCH is assumed to be transmitted
through Cell-specific Reference Signal CRS port .sup.by, a transmit
diversity scheme when the number of CSI-RS ports is larger than
1.
2. The method of claim 1, wherein the PDSCH is assumed to be
transmitted through CRS port by the transmit diversity scheme when
the number of CSI-RS ports is larger than 1, comprises: the PDSCH
is assumed to be transmitted through 2 CRS ports by two-port
transmit diversity scheme, when the number of CSI-RS ports is 2,
the PDSCH is assumed to be transmitted through 4 CRS ports, by a
4-port transmit diversity scheme, if the number of CSI-RS ports is
4, and the PDSCH is assumed to be transmitted through 2 CRS ports,
by a two-port transmit diversity scheme, or the PDSCH is assumed to
be transmitted through 4 CRS ports, by a four-port transmit
diversity scheme, if the number of CSI-RS ports is 8.
3. The method of claim 2, wherein the transmission scheme of the
PDSCH also comprises: further assuming, by the UE, the channel
matrix acquired by measurement of 2 CRS ports is HW, if the UE
assumes that the PDSCH uses 2 CRS ports, where H represents the
downlink channel transport matrix acquired by measurement of
CSI-RS, and W represents an 8.times.2 dimension matrix.
4. The method of claim 3, the transmission scheme of the PDSCH also
comprises: further assuming, by the UE, the channel matrix acquired
by measurement of 4 CRS ports is HW, if the UE assumes that the
PDSCH uses 4 CRS ports, where H represents the downlink channel
transport matrix acquired by measurement of CSI-RS, and W
represents an 8.times.4 dimension matrix.
5. The method of claim 4, wherein, the assumed number of CRS ports
and matrix W used when determining the CQI are predetermined before
reporting by the UE, and are known to the UE and the network
side.
6. The method of claim 1, wherein the mode for reporting the CQI by
the UE is one of the following: Physical Uplink Control Channel
PUCCH reporting mode 1-0; PUCCH reporting mode 2-0; Physical Shared
Control Channel PUSCH reporting mode 2-0; and PUSCH reporting mode
3-0.
7. The method of claim 1, wherein the UE acquires the configuration
information of the CSI-RS by broadcast mode.
8. A. User Equipment (UE) using non-Precoding Matrix Indicator
(non-PMI) for a transmission mode, comprising: a processor
configured as: a measurement module, the measurement module being
configured to measure CSI-RS according to the configuration
information of the CSI-RS and acquire a downlink channel transport
matrix; a determination module, the determination module being
configured to determine the CQI of a frequency domain reporting
unit according to the number of CSI-RS ports and the corresponding
transmission scheme of the PDSCH used when determining the CQI, and
the downlink channel transport matrix acquired by measurement
module; and a reporting module, the reporting module being
configured to report the CQI determined by the determination module
to the network side; and a memory device, the memory device being
configured to save the transmission scheme of the PDSCH, wherein
the transmission scheme of the PDSCH includes: the PDSCH is assumed
to be transmitted through single-port when the number of CSI-RS
ports is 1. and the PDSCH is assumed to be transmitted through CRS
port by a transmit diversity scheme when the number of CSI-RS ports
is larger than 1.
9. The UE of claim 8, wherein, for the information of the
transmission scheme of the PDSCH saved by the memory device, the
PDSCH is assumed to be transmitted through CRS port by transmit
diversity scheme when the number of CSI-RS ports is larger than 1,
and specifically includes: the PDSCH is assumed to be transmitted
through 2 CRS ports by two-port transmit diversity scheme, if the
number of CSI-RS ports is 2; the PDSCH is assumed to he transmitted
through 4 CRS ports by 4-port transmit diversity scheme, if the
number of CSI-RS ports is 4; and the PDSCH is assumed to be
transmitted through 2 CRS ports by two-port transmit diversity
scheme, or the PDSCH is assumed to be transmitted through 4 CRS
ports by four-port transmit diversity scheme, if the number of
CSI-RS ports is 8.
10. The UE of claim 9, wherein, for the transmission scheme
information of the PDSCH saved by the memory device, the
transmission scheme of the PDSCH also includes: further assuming,
the UE, the channel matrix acquired by measurement of 2 CRS ports
is HW, if the UE assumes that the PDSCH uses 2 CRS ports, where H
represents a downlink channel transport matrix acquired by
measurement of CSI-RS, and W represents an 8.times.2 dimension
matrix.
11. The UE of claim 9, wherein, for the transmission scheme
information of the PDSCH saved by the memory module, the
transmission scheme of the PDSCH also includes: further assuming,
the UE, the channel matrix acquired by measurement of 4 CRS ports
is HW, if the UE assumes that PDSCH uses 4 CRS ports, where H
represents a downlink channel transport matrix acquired by
measurement of CSI-RS, and W represents an 8.times.4 dimension
matrix,
12. The UE of claim 11, wherein, the assumed number of CRS ports
and matrix used when the determination module is determining the
CQI are predetermined before reporting by the UE, and are known to
the UE and the network side.
13. The UE of claim 8, wherein the mode of reporting the CQI by the
reporting module is one of the following: PUCCH reporting mode 1-0;
PUCCH reporting mode 2-0; PUSCH reporting mode 2-0; and PUSCH
reporting mode 3-0.
14. The UE of claim 9, wherein the processor is further configured
as: an acquiring module, the acquiring module being configured to
acquire the configuration information of the CSI-RS by broadcast
mode.
15. The method of claim 1, wherein the assumed number of CRS ports
and matrix W used when determining the CQI are predetermined before
reporting by the UE, and are known to the UE and the network
side.
16. The UE of claim 8, wherein the assumed number of CRS ports and
matrix W used when the determination module is determining the CQI
are predetermined before reporting by the UE, and are known to the
UE and the network side.
Description
[0001] The application requires the priority to Chinese patent
application, which should be submitted to the Chinese Patent Office
on Nov. 5, 2010, the application No. 201010537846.0, invention name
as "Method and Device for Reporting Channel Quality
Information".
FIELD OF THE PRESENT INVENTION The present invention relates to
wireless communication field, in particular to a method and device
for reporting channel quality information.
BACKGROUND OF THE PRESENT INVENTION
[0002] The LTE (Long Term Evolution) system adopts the physical
layer frame on the basis of OFDM (Orthogonal Frequency Division
Multiplexing) and MIMO (Multiple-Input Multiple-Out-put)
technologies. In order to adapt to transmission environment better,
the LTE system adopts various kinds of adaptive technologies. Based
on different application scenes, 8 kinds of downlink transmission
modes are defined in the LTE Rel-8/9 system, while another new kind
of transmission mode needs to be defined in the Rel-10 system to
support top 8 layers' downlink MIMO transmission. Based on the
adapting foundation of transmission mode, the eNB (evolved Node B)
in TM (Transmission Mode) 4, 7, 8 and 9 is able to select downlink
transmission rank adaptively according to spatial characteristics
of channels. Theoretically speaking, the network side is able to
adjust data rate of each data layer s through controlling
modulation order and code rate, so as to match transmission
capability of each spatial data channel precisely. However,
considering control complexity and feedback overhead, the MIMO
transmission of LTE system can support dynamic adjustment of at
most 2-codeword MCS (Modulation & Coding Scheme). Within the
transmission bandwidth of the LTE system, channel response often
shows obvious frequency selectivity, thus the eNB can select UE
(User Equipment) and schedule flexibly according to the channel
state and interference condition at each frequency band of each UE,
so as to acquire frequency selective scheduling and multi-user
diversity gain. In the mean time, the network side can allocate
resources reasonably according to channel state at each frequency
band to avoid interference among cells.
[0003] Channel quality information is the important foundation of
all kinds of adaptive adjustments and scheduling performed by the
network side. The LTE system quantizes channel quality into 4-bit
CQI (Channel Quality Indicator), label of each CQI corresponds to
an assembly of modulation mode and code rate, under which the UE
should guarantee the error probability of receiving transmission
block to be within 0.1.
[0004] When calculating CQI, the UE needs to assume the
transmission scheme of the PDSCH (Physical Downlink Shared Channel)
according to its transmission mode. For example, when calculating
the CQI defined in the LTE Rel-9 system, assumption mode of the
PDSCH transmission scheme is shown in Table 1.
TABLE-US-00001 TABLE 1 Assumption of PDSCH Transmission Scheme When
Calculating the CQI Trans- mission Transmission scheme of mode
PDSCH Description 1 Single-antenna port, port 0 Single-antenna
port, port 0 2 Transmit diversity Transmit diversity 3 Transmit
diversity if the Transmit diversity if the associated rank
indicator is 1, associated rank indicator is otherwise large delay
CDD 1, otherwise large delay CDD (Cyclic Delay Diversity) 4
Closed-loop spatial Closed-loop spatial multiplexing multiplexing 5
Multi-user MIMO Multi-user MIMO 6 Closed-loop spatial Closed-loop
spatial multiplexing with a single multiplexing with a single
transmission layer transmission layer 7 If the number of PBCH If
the number of PBCH antenna ports is one, antenna ports is 1,
Single-antenna port, port 0; single-antenna port, port 0; otherwise
Transmit diversity otherwise transmit diversity 8 If the UE is
configured without If the UE is configured PMI/RI reporting: if the
without PMI/RI reporting: if number of PBCH antenna the number of
PBCH ports is one, single-antenna antenna ports is 1, port, port 0;
otherwise single-antenna port, port 0; transmit diversity otherwise
transmit diversity If the UE is configured with If the UE is
configured with PMI/RI reporting: closed-loop PMI/RI reporting:
spatial multiplexing closed-loop spatial multiplexing
[0005] The CRS (Cell-specific Reference Signal)-based measurement
and demodulation mode are adopted in the transmission modes
1.about.6 of the LTE Rel-8/9 system, while the CRS-based
measurement and the DMRS (Demodulation Reference Signal)-based
demodulation mechanism are adopted in TM 7 and TM 8; wherein, in TM
2.about.6, the UE needs to calculate and report the recommended PMI
(Precoding Matrix Indicator) according to measurement of the CRS;
when reporting CQI, the UE assumes that the eNB uses the reported
PMI. Non-codebook precoding mode is adopted in TM 7, the UE only
needs to report the CQI to the eNB, then the eNB will calculate
precoding or figurative vector. Both the PMI and non-PMI feedback
modes are supported in the TM 9 system. Based on feedback mode of
high-layer configuration and specific reporting mode, the UE can
generate reporting content (including PMI/RI (Rank Indication)/CQI)
according to the measurement of CRS. In the LTE-A (LTE Advanced)
system, in order to support higher-order MIMO transmission (maximum
supporting 8 data layers) and multi-cell combined treatment
function in subsequent versions, a newly defined CSI-RS (Channel
State Information-Reference Signal) is introduced. The UE working
in TM 9 cannot generate CQI/PMI/RI reporting information without
the measurement of CSI-RS.
[0006] In the procedure of realizing the present invention, at
least the following problems exist in the current technologies:
[0007] In TM 9, for the transmission mode based PMI feedback, the
UE can assume that the eNB uses the reported PMI/RI. On this basis,
the UE can calculate the CQI of each codeword as per mode similar
to closed-loop spatial multiplexing (such as TM 4 system). However,
with regard to non-PMI feedback-based transmission mode, no CSI-RS
based measurement or reporting method for channel quality
information exists currently.
SUMMARY OF THE PRESENT INVENTION
[0008] The embodiments of the present invention aim to provide a
method and device for reporting channel quality information, so as
to realize CSI-RS-based measuring and reporting for channel quality
information on the basis of non-PMI feedback transmissions, for
this purpose, the embodiments of the present invention adopt the
following technical scheme:
[0009] A method for reporting channel quality information, which
comprises: measuring, by a User Equipment (UE), Channel State
Information-Reference Signal (CSI-RS) according to configuration
information of the CSI-RS, to acquire a downlink channel transport
matrix;
[0010] determining, by the UE, Channel Quality Indicator (CQI) of a
frequency domain reporting unit, according to number of CSI-RS
ports and the corresponding transmission scheme of Physical
Downlink Shared Channel (PDSCH) used when determining the CQI, and
the downlink channel transport matrix acquired by measurement;
[0011] reporting, by the UE, the determined CQI to network side. A
UE, which comprises:
[0012] measurement module, used to measure CSI-RS according to the
configuration information of the CSI-RS and acquire a downlink
channel transport matrix;
[0013] determination module, used to determine the CQI of a
frequency domain reporting unit according to the number of CSI-RS
ports and the corresponding transmission scheme of the PDSCH used
when determining the CQI, and the downlink channel transport matrix
acquired by measurement module;
[0014] reporting module, used to report the CQI determined by the
determination module to the network side.
[0015] In the embodiments of the present invention mentioned above,
the UE measures the CSI-RS, acquires a downlink channel transport
matrix, determines and reports the CQI of a frequency domain unit
according to the downlink channel transport matrix as well as the
transmission scheme of the PDSCH used when determining the CQI,
realizes measurement and reporting of CSI-RS based channel quality
information on the basis of non-PMI feedback transmissions.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 is a flow diagram of reporting channel quality
information of embodiments of the present invention;
[0017] FIG. 2 is a structural diagram of UE of embodiments of the
present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE PRESENT
INVENTION
[0018] For the above existing problems of the current technology,
the embodiments of the present invention put forward a non-PMI
feedback mode-based method for reporting channel quality
information.
[0019] In the following parts, detailed descriptions of embodiments
of the present invention are made combined with drawings of the
embodiments.
[0020] FIG. 1 is referred to as the flow diagram of reporting
channel quality information of embodiments of the present
invention; which comprises:
[0021] Step 101, the UE acquires the configuration information of
CSI-RS. To be specific, the UE can acquire the configuration
information of the CSI-RS according to system broadcast mode, viz.
the UE can monitor the broadcast information of the network side
and acquire the carried configuration information of the CSI-RS.
The CSI-RS configuration information includes time-frequency
position of the CSI-RS, transmission cycle, the number of ports for
transmission of CSI-RS, etc.
[0022] Step 102, the UE measures the CSI-RS according to the
configuration information of the CSI-RS, so as to acquire a
downlink channel transport matrix.
[0023] Wherein, according to the transmission cycle of the CSI-RS,
the UE can measure the CSI-RS transmitted from the time-frequency
position indicated by the configuration information of the CSI-RS.
The UE can acquire a downlink channel transport matrix by
measurement of the CSI-RS, and the channel transport matrix could
be shown as follows:
H = [ h 11 h 1 T h R 1 h RT ] [ 1 ] ##EQU00001##
[0024] The UE can further measure the received interference and
noise.
[0025] Step 103, the UE determines and reports CQI to the network
side according to the downlink channel transport matrix acquired by
measurement of the CSI-RS and to the assumed transmission scheme of
the PDSCH used when determining the CQI.
[0026] Wherein, before reporting CQI, the UE has acquired the
transmission scheme of the PDSCH used when calculating the CQI. To
be specific, the transmission scheme of the PDSCH used when
calculating the CQI could be preconfigured to the UE and base
station, so that the UE and the eNB will know the transmission
scheme of the PDSCH used when calculating the CQI before UE
reporting CQI. Based on the reporting mode configured by the
high-layer, the UE can calculate and report the CQI for each
frequency domain reporting unit (such as broadband or sub-band)
according to the transmission scheme of the PDSCH used when
calculating the CQI.
[0027] Wherein, reporting mode configured by the high-layer
includes one of the following:
[0028] PUCCH (Physical Uplink Control Channel) reporting mode
1-0;
[0029] PUCCH reporting mode 2-0;
[0030] PUSCH (Physical Uplink Shared Channel) reporting mode
2-0;
[0031] PUSCH reporting mode 3-0.
[0032] In the embodiments of the present invention, the
transmission scheme of the PDSCH used when calculating the CQI
comprising:
[0033] the UE assumes the PDSCH is transmitted through single-port
(such as port 0), when the number of CSI-RS ports is 1;
[0034] the UE assumes the PDSCH is transmitted through CRS port by
transmit diversity scheme when the number of CSI-RS ports is larger
than 1.
[0035] Wherein, when the number of CSI-RS ports is larger than 1,
specific condition comprising:
[0036] If the number of CSI-RS ports is 2, the UE assumes the PDSCH
is transmitted through two CRS ports (such as port 0 and 1) and is
transmitted by two-port transmit diversity scheme, such as SFBC
(Space-Frequency Block Coding);
[0037] If the number of CSI-RS ports is 4, the UE assumes the PDSCH
is transmitted through four CRS ports (such as port 0 to 3) and is
transmitted by 4-port transmit diversity scheme, such as
SFBC.sub.+FSTD (Frequency Switched Transmit Diversity);
[0038] If the number of CSI-RS ports is 8, the UE assumes the PDSCH
is transmitted through two CRS ports (such as port 0 to 1) and is
transmitted by 2-port transmit diversity scheme; or the UE assumes
the PDSCH is transmitted through four CRS ports (such as port 0 to
3) by four-port transmit diversity scheme.
[0039] Furthermore, it comprising:
[0040] If the PDSCH is assumed to be transmitted through two CRS
ports (such as port 0 and 1), the UE further assumes the channel
matrix acquired by the measurement of CRS port 0 and 1 is HW.
[0041] Where W represents an 8.times.2 dimension matrix, H
represents a downlink channel transport matrix acquired by UE's
measurement of the CSI-RS. If the PDSCH is assumed to be
transmitted through four CRS ports (such as port 0 to 3), the UE
further assumes the channel matrix acquired by measurement of CRS
port 0 to 3 is HW, where W represents an 8.times.4 dimension
matrix, H represents a downlink channel transport matrix acquired
by UE's measurement of the CSI-RS.
[0042] The assumed number of CRS ports and the matrix W used when
the UE is calculating the CQI are predetermined before reporting,
and are known to the UE and the network side.
[0043] The matrix W could be an 8xR dimension matrix, where R is
equal to 2 or 4, representing the number of CRS ports used when the
UE is calculating the CQI via transmitting diversity by the PDSCH.
W could be a certain predefined matrix or calculated by a fixed
order or selected from a matrix set as per a certain sequence;
wherein, specific definition or calculation or selection rule could
be determined according to realization requirements or actual
application. For example, matrix W could be generated from the
following methods:
EXAMPLE 1
[0044] the only one element of each column of martix W is 1, while
other elements are all 0. When R is equal to 2, W could be set
as
W = [ 1 0 0 1 0 0 ] ##EQU00002##
EXAMPLE 2
[0045] where D and U are both R.times.R matrixes, their values are
shown in Table 2. P represents an 8.times.R precoding matrix
selected from LTE-A8 antenna codebook by some certain order.
Wherein, i=0,1, . . . , M.sub.symb.sup.layer-1,
M.sub.symb.sup.layer represents the number of symbols in each data
layer.
TABLE-US-00002 TABLE 2 D and U Matrixes R U D(i) 2 1 2 [ 1 1 1 e -
j 2.pi. / 2 ] ##EQU00003## [ 1 0 0 e - j 2 .pi. i / 2 ]
##EQU00004## 4 1 2 [ 1 1 1 1 1 e - j 2 .pi. / 4 e - j 4 .pi. / 4 e
- j 6 .pi. / 4 1 e - j 4 .pi. / 4 e - j 8 .pi. / 4 e - j 12 .pi. /
4 1 e - j 6 .pi. / 4 e - j 12 .pi. / 4 e - j 18 .pi. / 4 ]
##EQU00005## [ 1 0 0 0 0 e - j 2 .pi. i / 4 0 0 0 0 e - j 4 .pi. i
/ 4 0 0 0 0 e - j 6 .pi. i / 4 ] ##EQU00006##
EXAMPLE 3
[0046] when R is equal to 2,
W = [ W 1 0 0 W 2 ] , ##EQU00007##
wherein, w.sub.1 and w.sub.2 are both 4.times.1 dimension column
vectors and their elements are not all 0;
[0047] When R is equal to 4,
W = [ W 1 W 2 W 3 W 4 ] , ##EQU00008##
where w.sub.1 to w.sub.4 are all 2.times.1 dimension column vectors
and their elements are not all 0.
[0048] It should be noted that, the UE can measure the CSI-RS and
report the CQI according to the transmission cycle of the CSI-RS
after acquiring the configuration information of the CSI-RS. As
long as the configuration information of the CSI-RS remains
unchanged, the UE can always measure the CSI-RS according to the
configuration information. When the configuration information of
the CSI-RS changes, the network side could inform the updated
configuration information of the CSI-RS by broadcast mode, and the
UE could then measure the CSI-RS and report the CQI after receiving
the updated configuration information of the CSI-RS.
[0049] The UE could also acquire the configuration information of
the CSI-RS in other ways besides the broadcast mode mentioned
above.
[0050] Based on the same technical design, the embodiments of the
present invention provide a UE which could be applied to the flow
mentioned above.
[0051] As is shown in FIG. 2, the UE provided by embodiments of the
present invention includes:
[0052] Measurement module 201, which is used to measure the CSI-RS
according to the configuration information of the CSI-RS, and
acquire a downlink channel transport matrix;
[0053] Determination module 202, which is used to determine the CQI
of a frequency domain reporting unit according to the number of
CSI-RS ports and the corresponding transmission scheme of the PDSCH
used when determining the CQI, and to the downlink channel
transport matrix acquired by measurement;
[0054] Reporting module 203, which is used to report the CQI
determined by the determination module to the network side.
[0055] The UE could also include memory module 204, which is used
to save the transmission scheme information of the PDSCH, the
transmission scheme of the PDSCH includes:
[0056] When the number of CSI-RS ports is 1, the PDSCH is assumed
to be transmitted through single-port;
[0057] When the number of CSI-RS is larger than 1, the PDSCH is
assumed to be transmitted through CRS port by transmit diversity
scheme.
[0058] In the UE mentioned above, for the transmission scheme
information of the PDSCH in the memory module 204, when the number
of CSI-RS ports is larger than 1, the PDSCH is assumed to be
transmitted through CRS port by transmit diversity scheme, to be
specific, includes:
[0059] If the number of CSI-RS ports is 2, the PDSCH is assumed to
be transmitted through 2 CRS ports by two-port transmit diversity
scheme;
[0060] If the number of CSI-RS ports is 4, the PDSCH is assumed to
be transmitted through 4 CRS ports by 4-port transmit diversity
scheme;
[0061] If the number of CSI-RS ports is 8, the PDSCH is assumed to
be transmitted through 2 CRS ports by two-port transmit diversity
scheme, or the PDSCH is assumed to be transmitted through 4 CRS
ports by four-port transmit diversity scheme.
[0062] In the UE mentioned above, for the transmission scheme
information of the PDSCH in memory module 204, the transmission
scheme of the PDSCH also includes:
[0063] If the UE assumes that the PDSCH uses 2 CRS ports, the UE
will further assume the channel matrix acquired by measurement of 2
CRS ports is HW, where H represents a downlink channel transport
matrix acquired by measurement of CSI-RS, and W represents an
8.times.2 dimension matrix. In the UE mentioned above, for the
transmission scheme information of the PDSCH in the memory module,
the transmission scheme of PDSCH also includes:
[0064] If the UE assumes that the PDSCH uses 4 CRS ports, the UE
will further assume the channel matrix acquired by measurement of 4
CRS ports is HW, where H represents a downlink channel transport
matrix acquired by measurement of CSI-RS, and W represents an
8.times.4 dimension matrix.
[0065] In the UE mentioned above, the assumed number of CRS ports
and the Matrix W used when determination module 202 is determining
the CQI are predetermined before reporting by the UE, and are known
to the UE and the network side.
[0066] In the UE mentioned above, mode of reporting the CQI by
reporting module is 203 is one of the following:
[0067] PUCCH reporting mode 1-0;
[0068] PUCCH reporting mode 2-0;
[0069] PUSCH reporting mode 2-0;
[0070] PUSCH reporting mode 3-0.
[0071] The UE mentioned above could also include acquiring module
205, which is used to acquire the configuration information of the
CSI-RS by broadcast mode, and to save the configuration information
of the CSI-RS into memory module 204.
[0072] Through the description of the embodiments of the present
invention, the UE acquires a downlink channel transport matrix by
measuring the CSI-RS, determines and reports the CQI according to
the downlink channel transport matrix as well as the preconfigured
transmission scheme of the PDSCH used when determining the CQI,
realizes measurement and reporting of CSI-RS-based channel quality
information on the basis of non-PMI feedback transmissions.
Wherein, the embodiments of the present invention configures
different transmission schemes of the PDSCH with regard to the
number of CSI-RS ports so as to improve the system adaptability and
flexibility.
[0073] The technical personnel in this field can be understood that
the modules can be distributed in device of the embodiments
according to the description of the embodiments above, and also can
be varied in one or multiply device of the embodiments. The modules
of the embodiments can be combined into a module, and also can be
further split into several sub-modules.
[0074] Through the description of the embodiments above, the
technical personnel in this field can understand clearly that the
present invention can be implemented by software and necessary
general hardware platform or hardware (the former is better in most
cases). Based on this understanding, the technical scheme or the
part making contributions to the prior art of the present invention
can be embodied by a form of software products essentially which
can be saved in a storage medium, including a number of
instructions for making a computer device (such as personal
computers, servers, or network equipments, etc.) implement the
methods described in the embodiments of the present invention.
[0075] The descriptions above are only preferred embodiments, it
should be pointed out, that for general technical personnel in this
field, on the premise of not breaking away from principles of the
present invention, some improvements and decorating can be done,
which should be as the protection scope of the present
invention.
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