U.S. patent application number 14/300767 was filed with the patent office on 2014-10-16 for method and apparatus for controlling serving grant of user terminal of neighboring cell.
The applicant listed for this patent is Huawei Technologies Co., Ltd.. Invention is credited to Chuanfeng HE.
Application Number | 20140307666 14/300767 |
Document ID | / |
Family ID | 48679699 |
Filed Date | 2014-10-16 |
United States Patent
Application |
20140307666 |
Kind Code |
A1 |
HE; Chuanfeng |
October 16, 2014 |
METHOD AND APPARATUS FOR CONTROLLING SERVING GRANT OF USER TERMINAL
OF NEIGHBORING CELL
Abstract
Embodiments of the present invention provide a method, an
apparatus, and a system for controlling a serving grant of a user
terminal (UE) of a neighboring cell. The method is used for
controlling a UE in a CELL-FACH state or in an idle state of a
neighboring cell through a common E-RGCH. The method includes:
obtaining a control command by monitoring the common E-RGCH of the
neighboring cell; determining whether the UE satisfies at least one
further configured controlled condition; and when the UE satisfies
the at least one controlled condition, adjusting the serving grant
of the UE based on the obtained control command. Through the method
and the apparatus according to the embodiments of the present
invention, throughput of the UE may be prevented from being reduced
excessively, thereby improving communication performance.
Inventors: |
HE; Chuanfeng; (Beijing,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Huawei Technologies Co., Ltd. |
Shenzhen |
|
CN |
|
|
Family ID: |
48679699 |
Appl. No.: |
14/300767 |
Filed: |
June 10, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/CN2012/086903 |
Dec 19, 2012 |
|
|
|
14300767 |
|
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Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04W 72/0466 20130101;
H04W 76/27 20180201; H04W 72/14 20130101 |
Class at
Publication: |
370/329 |
International
Class: |
H04W 72/14 20060101
H04W072/14; H04W 76/04 20060101 H04W076/04 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 30, 2011 |
CN |
201110456345.4 |
Mar 27, 2012 |
CN |
201210083592.9 |
Claims
1. A method for controlling a serving grant of a user equipment
(UE) of a neighboring cell through a common enhanced dedicated
channel relative grant channel (E-RGCH) of the neighboring cell,
wherein the UE is in a cell-forward access channel (CELL-FACH)
state or in an idle state, the method comprises: obtaining a
control command by monitoring the common E-RGCH of the neighboring
cell; determining whether the UE satisfies at least one controlled
condition; and when the UE satisfies the at least one controlled
condition, adjusting the serving grant of the UE based on the
obtained control command.
2. The method according to claim 1, further comprising: when the UE
does not satisfy one or more controlled conditions among the at
least one controlled condition, controlling the UE to neglect the
obtained control command.
3. The method according to claim 1, wherein the adjusting the
serving grant of the UE comprises: lowering the serving grant of
the UE.
4. The method according to claim 1, wherein the at least one
controlled condition is a serving grant threshold of the UE; the
determining whether the UE satisfies the at least one controlled
condition comprises: determining whether the serving grant of the
UE is higher than the serving grant threshold, wherein when the
serving grant of the UE is higher than the serving grant threshold,
it is determined that the UE satisfies the at least one controlled
condition.
5. The method according to claim 1, wherein the at least one
controlled condition is multiple monitoring thresholds for
monitoring the common E-RGCH; the determining whether the UE
satisfies the at least one controlled condition comprises:
determining a measurement result of the UE is in which range among
multiple ranges limited by the multiple monitoring thresholds,
wherein when the measurement result of the UE is in a range
corresponding to the at least one controlled condition, it is
determined that the UE satisfies the at least one controlled
condition.
6. The method according to claim 5, further comprising: arranging
each of the multiple ranges limited by the multiple monitoring
thresholds to correspond to each of multiple control commands on
the common E-RGCH, wherein the adjusting the serving grant of the
UE based on the obtained control command comprises: adjusting the
serving grant of the UE based on a control command corresponding to
the range which the measurement result of the UE is in.
7. The method according to claim 1, wherein the at least one
controlled condition is a serving grant threshold of the UE and
multiple monitoring thresholds for monitoring the common E-RGCH;
the determining whether the UE satisfies the at least one
controlled condition comprises: determining whether the serving
grant of the UE is higher than the serving grant threshold and a
measurement result of the UE is in which range among multiple
ranges limited by the multiple monitoring thresholds, wherein when
the serving grant of the UE is higher than the serving grant
threshold and the measurement result of the UE is in a range
corresponding to the at least one controlled condition, it is
determined that the UE satisfies the at least one controlled
condition.
8. The method according to claim 5, wherein the measurement result
of the UE comprises at least one of the following: (a) a path loss
difference between cell to which the UE belongs and the neighboring
cell, and (b) that the UE detects that a measurement result of a
common pilot channel (CPICH) of the neighboring cell reaches a
threshold for reporting a measurement event.
9. The method according to claim 5, further comprising: setting the
multiple monitoring thresholds according to a measurement event
triggering condition, wherein if a measurement item is a path loss
difference, the measurement event triggering condition is: 10 Log M
New + CIO New .ltoreq. W 10 Log ( 1 / i = 1 N A ( 1 / M i ) ) + ( 1
- W ) 10 Log M Best + ( R 1 a - H 1 a / 2 ) ##EQU00003## if the
measurement item is a measurement item other than the path loss
difference, the measurement event triggering condition is: 10 Log M
New + CIO New .gtoreq. W 10 Log ( i = 1 N A M i ) + ( 1 - W ) 10
Log M Best - ( R 1 a - H 1 a / 2 ) , ##EQU00004## wherein
CIO.sub.New is an offset of a cell entering a measurement reporting
range; W is a parameter that a network side sends to the user
equipment; R.sub.1a is a reporting range constant; and H.sub.1a is
a hysteresis parameter; and wherein the setting the multiple
monitoring thresholds according to the measurement event triggering
condition further comprises: setting the multiple monitoring
thresholds by configuring multiple corresponding parameters with
different values, for one or more parameters in CIO.sub.New, W,
R.sub.1a, and H.sub.1a in the measurement event triggering
condition.
10. The method according to claim 5, further comprising: setting
the multiple monitoring thresholds according to preset multiple
thresholds T, wherein the T is one of the following: (a) a path
loss difference, (b) common pilot channel received chip energy
divided by band power spectral density (CPICH Ec/N0), and (c)
common pilot channel received signal code power (CPICH RSCP).
11. An apparatus for controlling a serving grant of a user
equipment (UE) of a neighboring cell through a common enhanced
dedicated channel relative grant channel (E-RGCH) of the
neighboring cell, wherein the UE is in a cell-forward access
channel (CELL-FACH) state or in an idle, the apparatus comprises a
processor and a non-transitory processor-readable medium having
processor-executable instructions stored thereon, the
processor-executable instructions including a plurality of units,
the units including: an obtaining unit, configured to obtain a
control command by monitoring the common E-RGCH of the neighboring
cell; a determination unit, configured to determine whether the UE
satisfies at least one controlled condition; and a control unit,
configured to, when the UE satisfies the at least one controlled
condition, adjust the serving grant of the UE based on the obtained
control command.
12. The apparatus according to claim 11, wherein the control unit
is further configured to: when the UE does not satisfy one or more
controlled conditions among the at least one controlled condition,
control the UE to neglect the obtained control command.
13. The apparatus according to claim 11, wherein the control unit
adjusts the serving grant of the UE by lowering the serving grant
of the UE.
14. The apparatus according to claim 11, wherein the determination
unit determining whether the UE satisfies the at least one
controlled condition, further comprises: the determination unit is
configured to determine whether the serving grant of the UE is
higher than a serving grant threshold, wherein when the serving
grant of the UE is higher than the serving grant threshold, the
determination unit determines that the UE satisfies the at least
one controlled condition.
15. The apparatus according to claim 11, wherein the determination
unit determining whether the UE satisfies the at least one
controlled condition, comprises: the determination unit is
configured to determine a measurement result of the UE is in which
range among multiple ranges limited by the multiple monitoring
thresholds, wherein when the measurement result of the UE is in a
range corresponding to the at least one controlled condition, the
determination unit determines that the UE satisfies the at least
one controlled condition.
16. The apparatus according to claim 15, wherein the control unit
is further configured to arrange each of the multiple ranges
limited by the multiple monitoring thresholds to correspond to each
of multiple control commands on the common E-RGCH, wherein the
control unit adjusting the serving grant of the UE based on the
obtained control command comprises: the control unit is configured
to adjust a working state of the UE based on a control command
corresponding to the range which the measurement result of the UE
is in.
17. The apparatus according to claim 11, wherein the determination
unit determining whether the UE satisfies the at least one
controlled condition, comprises: the determination unit is
configured to determine whether the serving grant of the UE is
higher than the serving grant threshold and in which range among
multiple ranges limited by the multiple monitoring thresholds a
measurement result of the UE is, wherein when the serving grant of
the UE is higher than the serving grant threshold and the
measurement result of the UE is in a range corresponding to the at
least one controlled condition, the determination unit determines
that the UE satisfies the at least one controlled condition.
18. The apparatus according to claim 11, wherein the apparatus is
comprised in the user equipment.
19. A communication system for controlling a serving grant of a
user equipment (UE) of a neighboring cell through a common enhanced
dedicated channel relative grant channel (E-RGCH) of the
neighboring cell, comprising the UE and a network device wherein,
the UE is in a cell-forward access channel (CELL-FACH) state or in
an idle state, and the UE is configured to obtain a control command
from the network device by monitoring the common E-RGCH of the
neighboring cell, the UE is also configured to determine whether
the UE satisfies at least one controlled condition, when the UE
satisfies the at least one controlled condition, the UE is
configured to adjust the serving grant of the UE based on the
obtained control command.
20. The communication system according to claim 19, wherein the
network device comprises a base station, the UE obtaining a control
command from the network device comprises: the UE is configured to
obtain the control command from the base station.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation of International Patent
Application No. PCT/CN2012/086903, filed Dec. 19, 2012, which
claims priority to Chinese Patent Application No. 201110456345.4,
filed Dec. 30, 2011 and Chinese Patent Application No.
201210083592.9, filed Mar. 27, 2012, all of which are hereby
incorporated by reference in their entireties.
TECHNICAL FIELD
[0002] Embodiments of the present invention relate to the field of
communications, and in particular, to a method, an apparatus, and a
system for controlling a serving grant of a user terminal of a
neighboring cell.
BACKGROUND
[0003] A CELL-FACH (cell--forward access channel) enhanced uplink
feature is introduced to the WCDMA (wideband code division multiple
access) R8 version of 3GPP (3rd generation partnership project),
that is, a UE (user equipment) in a CELL-FACH state and in an idle
state is allowed to be able to obtain an E-DCH (enhanced dedicated
channel) resource through enhanced random access to replace an RACH
(random access channel) in the R99 version to implement uplink
transmission, so as to reduce a time delay of uplink transmission
of the UE and improve an uplink transmission rate of the UE.
[0004] A soft handover technology may make the UE establish radio
links with multiple cells at the same time, and a set of these
radio links is referred to as a radio link set. Uplink data sent by
the UE is received and combined by multiple cells in the radio link
set, thereby ensuring uplink throughput of the UE in a handover
region. At the same time, the multiple cells in the radio link set
may control uplink transmit power and a serving grant of the UE, so
as to achieve an objective of controlling neighboring cell
interference.
[0005] The soft handover technology is not supported in the
CELL-FACH state or in the idle state, so the control of the
neighboring cell interference caused by the uplink transmission of
the UE in the CELL-FACH state or in the idle state is a problem
required to be studied. In the CELL-FACH enhanced uplink feature of
the R8 version, no neighboring cell interference control mechanism
is introduced, while in the R11 version, the CELL-FACH state
continues to be enhanced, where the introduction of interference
control is included. Therefore, a method and an apparatus for
controlling the neighboring cell interference in the uplink
transmission of the UE in the CELL-FACH state or in the idle state
are required.
SUMMARY
[0006] The present invention is made based on the above objective,
and the objective of the present invention is to provide a method
and an apparatus for controlling a serving grant of a user terminal
of a neighboring cell, which can control neighboring cell
interference in uplink transmission of a UE in a CELL-FACH state or
in an idle state.
[0007] In one aspect, a method for controlling a serving grant of a
user terminal of a neighboring cell is provided, which is used for
controlling a UE in a CELL-FACH state or in an idle state of each
neighboring cell through a common E-RGCH channel of each cell,
where the UE in the CELL-FACH state or in the idle state obtains a
control command by monitoring the common E-RGCH channel of a
neighboring cell of a cell to which the UE belongs, thereby
adjusting a serving grant of the UE, and the method includes:
further setting at least one controlled condition; determining
whether the UE satisfies the at least one controlled condition; and
when the UE satisfies the at least one controlled condition,
adjusting the serving grant of the UE based on the obtained control
command.
[0008] In another aspect, an apparatus for controlling a serving
grant of a user terminal of a neighboring cell is provided, which
is used for controlling a UE in a CELL-FACH state or in an idle
state of each neighboring cell through a common E-RGCH channel of
each cell, where the UE in the CELL-FACH state or in the idle state
obtains a control command by monitoring the common E-RGCH channel
of a neighboring cell of a cell to which the UE belongs, thereby
adjusting a serving grant of the UE, and the apparatus includes: a
setting unit, configured to further set at least one controlled
condition; a determination unit, configured to determine whether
the UE satisfies the at least one controlled condition; and a
control unit, configured to, when the UE satisfies the at least one
controlled condition, adjust the serving grant of the UE based on
the obtained control command.
[0009] Through the method and the apparatus for controlling a
serving grant of a user terminal of a neighboring cell according to
the embodiments of the present invention, interference control may
be performed on a UE in a CELL-FACH state or in an idle state of a
neighboring cell, and at the same time, throughput of the UE may be
prevented from being reduced excessively, thereby improving
communication performance.
BRIEF DESCRIPTION OF DRAWINGS
[0010] To describe the technical solutions in the embodiments of
the present invention more clearly, the following briefly
introduces accompanying drawings required for describing the
embodiments. Apparently, the accompanying drawings in the following
description show merely some embodiments of the present invention,
and persons of ordinary skill in the art may still derive other
drawings from these accompanying drawings without creative
efforts.
[0011] FIG. 1 is a schematic flow chart showing a method for
controlling a serving grant of a user terminal of a neighboring
cell according to an embodiment of the present invention; and
[0012] FIG. 2 is a schematic block diagram showing an apparatus for
controlling a serving grant of a user terminal of a neighboring
cell according to an embodiment of the present invention.
DESCRIPTION OF EMBODIMENTS
[0013] The following clearly describes the technical solutions in
the embodiments of the present invention with reference to the
accompanying drawings in the embodiments of the present invention.
Apparently, the described embodiments are merely a part rather than
all of the embodiments of the present invention. All other
embodiments obtained by persons of ordinary skill in the art based
on the embodiment of the present invention without creative efforts
shall fall within the protection scope of the present
invention.
[0014] In order to control interference of a UE in a CELL-FACH
state or in an idle state of a neighboring cell in uplink
transmission, a common E-RGCH (Enhanced Dedicated Channel Relative
Grant Channel: enhanced dedicated channel relative grant channel)
channel may be configured in each cell, which is used for
monitoring when the UE in the CELL-FACH state or in the idle state
of the neighboring cell satisfies a certain condition. If each cell
finds that neighboring cell interference is high, a "down" command
may be sent through the configured common E-RGCH channel to control
the UE in the CELL-FACH state or in the idle state of the
neighboring cell to lower a serving grant (SG), thereby reducing
neighboring cell interference generated by the UE.
[0015] The condition for a UE to monitor a common E-RGCH channel of
a neighboring cell may include: the UE detects that a path loss
difference between a current cell and the neighboring cell is less
than a certain threshold; and the UE detects that a measurement
result of a CPICH (Common Pilot Channel: common pilot channel)
channel of the neighboring cell reaches a threshold for reporting a
measurement event.
[0016] In a specific control process, an RNC (Radio Network
Controller) first broadcasts a primary scrambling code of each
neighboring cell and a channelization code of a common E-RGCH
channel, so that the UE can monitor the common E-RGCH channel, and
the common E-RGCH channel is used for sending a control command to
the UE of the neighboring cell. After that, when a certain cell
finds that neighboring cell interference exceeds a threshold, a
control command is sent on the common E-RGCH channel, for example,
a "down" command, and when the UE satisfies a condition for
monitoring a common E-RGCH channel of a neighboring cell, the UE
monitors the common E-RGCH channel of the neighboring cell to
obtain the "down" command to lower a serving grant of the UE.
[0017] At that time, in the above method for controlling
neighboring cell interference, when a certain cell needs to control
the UE in the CELL-FACH state or in the idle state of the
neighboring cell through the common E-RGCH channel to lower the SG,
so as to reduce interference, all UEs that are in multiple
neighboring cells and satisfy the condition for monitoring the
common E-RGCH of the cell will lower SGs according to the "down"
command of the common E-RGCH, thereby making the throughput of the
UE in the CELL-FACH state or in the idle state of the neighboring
cell fall significantly. However, in practice, the objective of
controlling interference may be achieved only by lowering SGs of
part of the UEs.
[0018] In another aspect, a certain UE in the CELL-FACH state or in
the idle state may satisfy a condition for monitoring common E-RGCH
channels of multiple neighboring cells, and when any neighboring
cell needs to control interference through a common E-RGCH, the UE
in the CELL-FACH state or in the idle state is controlled to lower
a SG of the UE, thereby causing excessive reduction of the
throughput of the UE.
[0019] Based on the above problem, an embodiment of the present
invention provides a method for controlling a serving grant of a
user terminal of a neighboring cell, which is used for controlling
a UE in a CELL-FACH state or in an idle state of each neighboring
cell through a common E-RGCH channel of each cell, where the UE in
the CELL-FACH state or in the idle state obtains a control command
by monitoring the common E-RGCH channel of a neighboring cell of a
cell to which the UE belongs, thereby adjusting a serving grant of
the UE, and the method includes: further setting at least one
controlled condition; determining whether the UE satisfies the at
least one controlled condition; and when the UE satisfies the at
least one controlled condition, adjusting the serving grant of the
UE based on the obtained control command.
[0020] That is to say, in the embodiment of the present invention,
in addition to the monitoring condition for the UE to monitor the
common E-RGCH channel of the neighboring cell, one or more
controlled conditions are set additionally, and only in a situation
that it is determined that the UE satisfies the one or more
controlled conditions, the UE adjusts a working state of the UE
itself based on the obtained control command, for example, lowering
a serving grant, thereby reducing interference that the UE in the
CELL-FACH state or in the idle state causes to the neighboring cell
in an uplink transmission process. In this way, through the
additionally set at least one controlled condition, control
granularity for the UE in the CELL-FACH state or in the idle state
may further be increased, so as to avoid a rough change of serving
grants of all UEs in the CELL-FACH state or in the idle state that
satisfy the monitoring condition, thereby preventing a situation of
excessive reduction of overall throughput of all UEs in a
neighboring cell of a cell that needs to control neighboring cell
interference, and excessive reduction of individual throughput of a
single UE.
[0021] FIG. 1 is a schematic flow chart showing a method for
controlling a serving grant of a user terminal of a neighboring
cell according to an embodiment of the present invention. As shown
in FIG. 1, the method is used for controlling a UE in a CELL-FACH
state or in an idle state of a neighboring cell through a common
E-RGCH channel, where the UE in the CELL-FACH state or in the idle
state obtains a control command by monitoring the common E-RGCH
channel of the neighboring cell, thereby adjusting a serving grant
of the UE, and the method includes: S1: further setting at least
one controlled condition; S2: determining whether the UE satisfies
the at least one controlled condition; and S3: when the UE
satisfies the at least one controlled condition, adjusting the
serving grant of the UE based on the obtained control command.
[0022] The above method further includes: when the UE does not
satisfy one or more controlled conditions among the at least one
controlled condition, controlling the UE not to monitor a
corresponding control command on the common E-RGCH channel.
[0023] The above method further includes: when the UE does not
satisfy one or more controlled conditions among the at least one
controlled condition, controlling the UE to neglect the obtained
corresponding control command.
[0024] As mentioned above, generally, when the UE satisfies a
condition for monitoring a common E-RGCH channel of a cell to which
the UE belongs, a control command may be obtained from the common
E-RGCH channel to adjust the serving grant of the UE. However, a
situation that the UE does not satisfy the condition for monitoring
a common E-RGCH channel of a cell to which the UE belongs may also
emerge. In the embodiment of the present invention, in addition to
the condition for monitoring the common E-RGCH channel, one or more
controlled conditions are further set additionally, so it may be
determined whether the UE satisfies all conditions including the
condition for monitoring the common E-RGCH channel, and only when
the UE satisfies the condition for monitoring the common E-RGCH
channel and all the set controlled conditions, a working state of
the UE is adjusted based on the obtained control command, for
example, lowering the serving grant, thereby improving control
granularity of the UE. When the UE has not yet satisfied all the
conditions including the condition for monitoring the common E-RGCH
channel, there may also be two options: first, the UE may not
monitor the common E-RGCH channel at all, so the UE cannot obtain
the control command; or the UE may be enabled to keep monitoring
the common E-RGCH channel to obtain the control command, and only
whether the control command is neglected is controlled at the end
of the UE. In a specific situation, adjustment may be performed
according to specific configuration of the UE end, and the
embodiment of the present invention is not intended to impose any
limitation on this.
[0025] In the above method, for example, the working state of the
UE may be adjusted by lowering the serving grant of the UE. In the
above descriptions, it has already been mentioned that the
objective of controlling neighboring cell interference may be
achieved by controlling uplink transmit power and the serving grant
of the UE. In a current environment, lowering the serving grant
will also reduce the uplink transmit power to certain extent, so in
the embodiment of the present invention, the objective of reducing
interference in uplink transmission is achieved preferably by
lowering the SG. Definitely, persons skilled in the art can
understand that, here, the interference in the uplink transmission
may also be reduced in another manner of adjusting the working
state of the UE, for example, directly reducing the uplink transmit
power, thereby implementing control on the neighboring cell
interference, and the embodiment of the present invention is not
intended to impose any limitation on this.
[0026] In the above method, the at least one controlled condition
is a serving grant threshold of the UE; and the step of determining
whether the UE satisfies the at least one controlled condition
specifically is: determining whether the serving grant of the UE is
higher than the serving grant threshold, and when the serving grant
of the UE is higher than the serving grant threshold, determining
that the UE satisfies the at least one controlled condition.
[0027] In the embodiment of the present invention, the at least one
controlled condition may be a threshold of the SG, referred to as
an SG threshold below. In this way, when the UE in the CELL-FACH
state or in the idle state monitors the common E-RGCH channel of
the neighboring cell, the UE may compare the SG of the UE with a
set SG threshold, and when the SG of the UE is lower than the set
SG threshold, the UE is no longer controlled by the common E-RGCH
channel of the neighboring cell, for example, not monitoring the
common E-RGCH channel, or neglecting the control command of the
common E-RGCH channel. Only when the SG of the UE is higher than
the set SG threshold, and at the same time, the UE satisfies the
condition for monitoring the common E-RGCH channel of the
neighboring cell, the UE adjusts the working state of the UE
according to the control command obtained by monitoring the common
E-RGCH channel of the neighboring cell, for example, lowering the
SG, thereby reducing the interference in the uplink
transmission.
[0028] Here, the SG of the UE itself decides throughput of the UE,
so setting the SG threshold of the UE itself may make each terminal
UE maintain a certain SG, and not make the SG be lowered
excessively. That is to say, after the above method is adopted,
after the SG of the UE in the CELL-FACH state or in the idle state
is lowered to a certain extent, the UE no longer follows the
control command sent by the common E-RGCH channel, to further
reduce the SG, thereby avoiding excessive reduction of the
throughput of the UE in the CELL-FACH state or in the idle state.
Also, by directly setting a controlled threshold to an SG of each
UE, the above effect may be achieved through direct control on the
SG, which improves precision of the control.
[0029] In the above method, the at least one controlled condition
is multiple monitoring thresholds for monitoring the common E-RGCH
channel, where the multiple monitoring thresholds include a first
monitoring threshold, and the first monitoring threshold is a
monitoring threshold for the determining whether the UE in the
CELL-FACH state or in the idle state can monitor the common E-RGCH
channel; and the step of determining whether the UE satisfies the
at least one controlled condition specifically is: determining
which range interval among multiple range intervals limited by the
multiple monitoring thresholds a measurement result of the UE is
in, and when the measurement result of the UE is in a specified
range interval among the multiple range intervals limited by the
multiple monitoring thresholds, determining that the UE satisfies
the at least one controlled condition.
[0030] The above method further includes: making the multiple range
intervals limited by the multiple monitoring thresholds correspond
one-to-one to multiple control commands on the common E-RGCH
channel, and the step of adjusting a serving grant of the UE based
on the obtained control command specifically is: adjusting the
serving grant of the UE based on a control command corresponding to
the specified range interval.
[0031] In the above method, the step of making the multiple range
intervals limited by the multiple monitoring thresholds correspond
one-to-one to the multiple control commands on the common E-RGCH
channel specifically includes: making the multiple range intervals
limited by the multiple monitoring thresholds correspond one-to-one
to multiple different signatures configured on the common E-RGCH
channel; and sending multiple control commands through the multiple
different signatures configured on the common E-RGCH channel, where
in a situation that the measurement result of the UE is in one of
the multiple range intervals limited by the multiple monitoring
thresholds, the UE monitors a signature that is configured on the
common E-RGCH channel and corresponds to this specified range
interval.
[0032] In the above method, the measurement result of the UE is
used for the UE to decide whether to monitor the common E-RGCH
channel of the neighboring cell, and includes measurement values
such as a path loss difference, a measurement event, and EcIo.
[0033] Specifically, in a current situation, the condition for the
UE to monitor the common E-RGCH channel is already set, namely, the
aforementioned condition that the UE detects that a path loss
difference between a current cell and the neighboring cell is less
than a certain threshold; and the UE detects that a measurement
result of a CPICH channel of the neighboring cell reaches a
threshold for reporting a measurement event. In the embodiment of
the present invention, the condition is referred to as the first
monitoring threshold. In addition, in the method for controlling
neighboring cell interference in the embodiment of the present
invention, one or more new monitoring thresholds may be further set
additionally, that is, thresholds for deciding the monitoring of
the common E-RGCH channel of the neighboring cell, such as a path
loss difference, a measurement event, and EcIo. In this way, in
addition to that the first monitoring threshold classifies the UE
into two types of UEs: a UE capable of monitoring the common E-RGCH
channel and a UE incapable of monitoring the common E-RGCH channel,
the UE capable of monitoring the common E-RGCH channel is further
classified through a new monitoring threshold. Taking the above
description as an example, it is assumed that a path loss
difference of the UE capable of monitoring the common E-RGCH
channel needs to satisfy a condition of being less than a, other
two thresholds b and c of the path loss difference are set, and
c<b<a. The three thresholds a, b and c limit multiple range
intervals, that is, being greater than b and less than a, being
greater than c and less than b, and being less than c, so the UE
satisfying the monitoring of the common E-RGCH channel can further
be classified into three types, that is, having a path loss
difference being greater than b and less than a, having a path loss
difference being greater than c and less than b, and having a path
loss difference being less than c. That is, measurement results of
the UE are in the range intervals of being greater than b and less
than a, being greater than c and less than b, and being less than
c. In this way, only the working state of the UE in a certain
specified range, for example, in a range of being greater than b
and less than a may be controlled and adjusted, for example,
lowering the SG, thereby reducing the neighboring cell
interference. Definitely, here persons skilled in the art may also
understand that, the embodiment of the present invention may also
lower SGs of the UE in several specified ranges, for example,
lowering a SG of the UE in the range of being greater than c and
less than b and a SG of the UE in the range of being less than c at
the same time.
[0034] In addition, corresponding to further classification of the
UE satisfying the monitoring of the common E-RGCH channel,
classification for control commands of the common E-RGCH channel
may also be further set, namely, the control commands of the common
E-RGCH channel may be made to correspond to different ranges of the
UE that are limited by multiple monitoring thresholds. Likewise, as
the above example, UEs whose measurement results are in the ranges
of being greater than b and less than a, being greater than c and
less than b, and being less than c may obtain control commands
corresponding to the several ranges from the common E-RGCH channel.
For example, corresponding to a monitoring threshold in the range
being greater than b and less than a, the SG may not be lowered;
corresponding to a monitoring threshold in the range greater than c
and less than b, the SG may be lowered by one level; and
corresponding to the monitoring threshold in the range being less
than c, the SG may be lowered by two levels. In this way, by
issuing different control commands for a UE in different monitoring
conditions to control a working state of the UE, precision of the
control may obviously be further improved, thereby improving
overall efficiency of a communication system.
[0035] Specifically, correspondence between different control
commands and different monitoring conditions of the UE may be
implemented at the end of the UE, or implemented at the end of the
common E-RGCH channel. For example, when the common E-RGCH channel
issues a control command, multiple control commands may be sent at
the same time, and at the same time, each control command carries
an identifier of a corresponding monitoring condition. In this way,
after receiving the multiple control commands, the UE may perform
matching based on an identifier of a monitoring condition and the
monitoring condition of the UE, so as to selectively respond to one
of the control commands. In addition, it may also be implemented at
the end of the UE, which is making different monitoring conditions,
that is, ranges of monitoring thresholds correspond one-to-one to
the multiple different signatures configured on the common E-RGCH
channel, and the common E-RGCH channel sends the multiple control
commands through the configured multiple different signatures. In
this way, when monitoring the common E-RGCH channel, the UE may
select a signature corresponding to a current specified monitoring
condition according to a specified range that is limited by the
multiple monitoring thresholds and where a measurement result is
located, thereby obtaining a control command corresponding to the
signature.
[0036] Here, the multiple control commands are set according to a
situation of the neighboring cell interference. For example, the
nearer to a cell center a certain UE is, the larger a path loss
difference of the UE is, and as the UE moves towards a cell edge,
the path loss difference of the UE gradually decreases. However, as
the UE moves towards the cell edge, interference that the UE causes
to the neighboring cell is enhanced correspondingly. Therefore, in
the embodiment of the present invention, it may be set that the
closer to the cell edge the UE is, the more the SG is lowered,
namely, as the aforementioned situation, in a situation of a
smaller path loss difference, the SG of the UE is lowered more. In
this way, by controlling a SG of a UE satisfying a threshold range
of a corresponding monitoring condition, control on the SG of the
UE may be optimized, thereby achieving the objective of optimally
controlling the interference of the UE in the uplink
transmission.
[0037] When the UE decides, according to whether the measurement
result reaches a condition for triggering event 1A, whether to
monitor the common E-RGCH channel of the neighboring cell, the
multiple monitoring thresholds may be set according to the
triggering condition of the measurement event, i.e., event 1A. A
current condition for triggering event 1A is decided by the
following formulas.
[0038] When a measurement item is the path loss difference, the
triggering condition is:
10 Log M New + CIO New .ltoreq. W 10 Log ( 1 / i = 1 N A ( 1 / M i
) ) + ( 1 - W ) 10 Log M Best + ( R 1 a - H 1 a / 2 )
##EQU00001##
[0039] when the measurement item is a measurement item other than
the path loss difference, the triggering condition is:
10 Log M New + CIO New .gtoreq. W 10 Log ( i = 1 N A M i ) + ( 1 -
W ) 10 Log M Best - ( R 1 a - H 1 a / 2 ) ##EQU00002##
[0040] where,
[0041] M.sub.New is a measurement result of a cell entering a
measurement reporting range;
[0042] CIO.sub.New is an offset of the cell entering the
measurement reporting range;
[0043] M.sub.i is a measurement result of a cell not limited to
participate in calculation of a reporting range in an active
set;
[0044] N.sub.A is the number of cells not limited to participate in
the calculation of the reporting range in the current active
set;
[0045] W is a parameter that a network side sends to a user
equipment;
[0046] R.sub.1a is a reporting range constant; and
[0047] H.sub.1a is a hysteresis parameter of event 1A.
[0048] For the situation that the measurement item is the path loss
difference:
[0049] M.sub.Best is a measurement result of a cell with the lowest
measurement result among the cells not limited to participate in
the calculation of the reporting range in the active set, without
considering an offset of any cell.
[0050] For the situation that the measurement item is the
measurement item other than the path loss difference:
[0051] M.sub.Best is a measurement result of a cell with the
highest measurement result among the cells not limited to
participate in the calculation of the reporting range in the active
set, without considering the offset of any cell; and it can be
known from the above formulas for calculating the triggering of the
measurement event that, the triggering condition is decided
collectively by the measurement result of the cell not limited to
participate in the calculation of the reporting range in the active
set M.sub.i, M.sub.Best, and the measurement result of the cell
entering the measurement reporting range M.sub.New, and the
configured parameters CIO.sub.New, W, R.sub.1a, and H.sub.1a. At
present, the parameters CIO.sub.New, W, R.sub.1a, and H.sub.1a are
configured into a certain value by a network side, and according to
the above formulas, the UE may obtain a unique threshold for
triggering event 1A according to the measurement result, thereby
deciding whether to monitor the common E-RGCH channel of the
neighboring cell. By configuring multiple corresponding parameters
of multiple different values for one or more parameters among the
parameters CIO.sub.New, W, R.sub.1a and H.sub.1a, multiple
thresholds for triggering event 1A may be obtained according to the
above formula, that is, multiple monitoring thresholds for
monitoring the common E-RGCH channel of the neighboring cell. For
example, multiple different CIO.sub.New parameters may be
configured for the parameter CIO.sub.New, such as CIO.sub.New1,
CIO.sub.New2, and CIO.sub.New3, and each different CIO.sub.New
parameter decides a different threshold for triggering the event
1A, namely, multiple monitoring thresholds for deciding to monitor
the common E-RGCH channel of the neighboring cell.
[0052] When the UE decides, according to whether the measurement
result reaches a defined threshold T, whether to monitor the common
E-RGCH channel of the neighboring cell, multiple monitoring
thresholds may be implemented by defining multiple thresholds T.
The defined threshold T may be the path loss difference, CPICH
Ec/N0 (common pilot channel received chip energy divided by band
power spectral density), or CPICH RSCP (CPICH Received Signal Code
Power, common pilot channel received signal code power). For
example, multiple thresholds T are defined, such as T1, T2 and T3,
and each different threshold T decides different monitoring
thresholds for deciding to monitor the common E-RGCH channel of the
neighboring cell.
[0053] As described above, in a situation that only one monitoring
threshold is configured, and when it is found that the neighboring
cell interference exceeds a limit, a "down" command is sent through
the common E-RGCH channel. At this time, in the neighboring cell,
SGs of all UEs in the CELL-FACH state or in the idle state that
satisfy the monitoring the common E-RGCH channel is lowered.
However, in practice, the objective of controlling interference can
be achieved by reducing interference of only part of the UEs in the
CELL-FACH state or in the idle state. By configuring multiple
thresholds for monitoring the common E-RGCH channel, UEs that may
cause interference for the neighboring cell may be classified, and
through the different control commands configured on the common
E-RGCH channel, the interference of part of the UEs in the
CELL-FACH state or in the idle state is controlled. Persons skilled
in the art can understand that, as long as the objective of
controlling the neighboring cell interference can be achieved, the
embodiment of the present invention is not intended to make
unnecessary limitation on a specific control process. In this way,
by avoiding reduction of the SGs of all the UEs, excessive
reduction of the throughput of the UE in the CELL-FACH state or in
the idle state may be avoided.
[0054] In addition, conditions of the SG threshold and the
monitoring threshold may also be combined for use, namely, in the
above method, the at least one controlled condition may be the
serving grant threshold of the UE and multiple monitoring
thresholds for monitoring the common E-RGCH channel. Also, the step
of determining whether the UE satisfies the at least one controlled
condition specifically is: determining whether the serving grant of
the UE is higher than the serving grant threshold and which range
among the multiple ranges limited by the multiple monitoring
thresholds the measurement result of the UE is in, where when the
serving grant of the UE is higher than the serving grant threshold
and the measurement result of the UE is in a specified range
limited by the multiple monitoring thresholds, the UE satisfies the
at least one controlled condition.
[0055] That is, in the example of combining the above SG threshold
and the multiple monitoring thresholds, in a situation of
configuring multiple thresholds for deciding to monitor the common
E-RGCH channel of the neighboring cell, such as the path loss
difference and the measurement result, the SG threshold is further
configured. Here, the SG threshold may be a common SG threshold in
all monitoring conditions, or a respective SG threshold in each
monitoring condition. When the UE compares the measured path loss
difference, measurement result and so on with the configured
monitoring thresholds, in a situation of satisfying a range of a
certain monitoring threshold, the UE monitors the common E-RGCH
channel of the neighboring cell to obtain a corresponding control
command. At the same time, when the SG of the UE is lower than a SG
threshold or a common SG threshold corresponding to the monitoring
threshold, in the situation of satisfying the monitoring threshold
such as the path loss difference and the measurement result, the UE
adjusts the working state of the UE according to the control
command obtained by monitoring the common E-RGCH channel of the
neighboring cell, for example, lowering the SG.
[0056] Similarly, the descriptions in the above example of
separately applying the SG threshold and the monitoring threshold
may also be equivalently applied to an example of combining the
both. Also, persons skilled in the art can understand that, as long
as the objective of controlling the neighboring cell interference
can be achieved, the embodiment of the present invention is not
intended to make unnecessary limitation on a specific control
process. Also, by combining the SG threshold and the monitoring
threshold, not only graded control on the UE in the CELL-FACH state
or in the idle state can be satisfied, but also excessive reduction
of the SG of the UE in the CELL-FACH state or in the idle state is
avoided.
[0057] In another aspect of the embodiment of the present
invention, an apparatus for controlling a serving grant of a user
terminal of a neighboring cell is provided, which is used for
controlling a UE in a CELL-FACH state or in an idle state of each
neighboring cell through a common E-RGCH channel of each cell,
where the UE in the CELL-FACH state or in the idle state obtains a
control command by monitoring the common E-RGCH channel of a
neighboring cell of a cell to which the UE belongs, thereby
adjusting a serving grant of the UE, and the apparatus includes: a
setting unit, configured to further set at least one controlled
condition; a determination unit, configured to determine whether
the UE satisfies the at least one controlled condition; and a
control unit, configured to, when the UE satisfies the at least one
controlled condition, adjust the serving grant of the UE based on
the obtained control command.
[0058] Through the above apparatus for controlling a serving grant
of a user terminal of a neighboring cell, in addition to a
monitoring condition for the UE to monitor the common E-RGCH
channel of the neighboring cell, one or more controlled conditions
may be set additionally, and only in a situation that it is
determined that the UE satisfies the one or more controlled
conditions, the UE adjusts a working state of the UE based on the
obtained control command, thereby reducing interference that the UE
in the CELL-FACH state or in the idle state causes to the
neighboring cell in an uplink transmission process. In this way,
through the additionally set at least one controlled condition,
control granularity for the UE in the CELL-FACH state or in the
idle state may further be increased, so as to avoid a rough change
of working states of all UEs in the CELL-FACH state or in the idle
state that satisfy the monitoring condition, thereby preventing a
situation of excessive reduction of overall throughput of all UEs
in a neighboring cell of a cell that needs to control neighboring
cell interference, and excessive reduction of individual throughput
of a single UE.
[0059] FIG. 2 is a schematic block diagram showing an apparatus for
controlling a serving grant of a user terminal of a neighboring
cell according to an embodiment of the present invention. As shown
in FIG. 2, an apparatus for controlling a serving grant of a user
terminal of a neighboring cell 10 is used for controlling a UE in a
CELL-FACH state or in an idle state of each neighboring cell
through a common E-RGCH channel of each cell, where the UE in the
CELL-FACH state or in the idle state obtains a control command by
monitoring the common E-RGCH channel of a neighboring cell of a
cell to which the UE belongs, thereby adjusting a serving grant of
the UE, and the apparatus 10 includes: a setting unit 11,
configured to further set at least one controlled condition; a
determination unit 12, connected to the setting unit 11, and
configured to determine whether the UE satisfies the at least one
controlled condition; and a control unit 13, connected to the
determination unit 12, and configured to, when the UE satisfies the
at least one controlled condition, adjust the serving grant of the
UE based on the obtained control command.
[0060] In the above apparatus, the control unit is further
configured to: when the UE does not satisfy one or more controlled
conditions among the at least one controlled condition, control the
UE not to monitor the common E-RGCH channel.
[0061] In the above apparatus, the control unit is further
configured to: when the UE does not satisfy one or more controlled
conditions among the at least one controlled condition, control the
UE to neglect the obtained control command.
[0062] In the above apparatus, the control unit adjusts the working
state of the UE by lowering the serving grant of the UE.
[0063] In the above apparatus for controlling neighboring cell
interference, the at least one controlled condition is a serving
grant threshold of the UE; the determining unit determines whether
the UE satisfies the at least one controlled condition specifically
is: determining whether the serving grant of the UE is higher than
the serving grant threshold, where when the serving grant of the UE
is higher than the serving grant threshold, the determination unit
determines that the UE satisfies the at least one controlled
condition.
[0064] In the above apparatus, the at least one controlled
condition is multiple monitoring thresholds for monitoring the
common E-RGCH channel; the determination unit determining whether
the UE satisfies the at least one controlled condition specifically
is: determining which range among multiple ranges limited by the
multiple monitoring thresholds a measurement result of the UE is
in, where determination unit when the measurement result of the UE
is in a specified range limited by the multiple monitoring
thresholds, the determination unit determines that the UE satisfies
the at least one controlled condition.
[0065] In the above apparatus for controlling neighboring cell
interference, the control unit is further configured to make the
multiple ranges limited by the multiple monitoring thresholds
correspond one-to-one to multiple control commands on the common
E-RGCH channel, and the control unit adjusting the working state of
the UE based on the obtained control command specifically is:
adjusting the working state of the UE based on a control command
corresponding to a specified range.
[0066] In the above apparatus for controlling neighboring cell
interference, the control unit making the multiple ranges limited
by the multiple monitoring thresholds correspond one-to-one to the
multiple control commands on the common E-RGCH channel specifically
includes: making the multiple ranges limited by the multiple
monitoring thresholds correspond one-to-one to multiple different
signatures configured on the common E-RGCH channel; and receiving
multiple control commands through the multiple different signatures
configured on the common E-RGCH channel, where in a situation that
the determination unit determines that the measurement result of
the UE is in the specified range limited by the multiple monitoring
thresholds, the control unit controls the UE to monitor a signature
that is configured on the common E-RGCH channel and corresponds to
the specified range.
[0067] In the above apparatus for controlling neighboring cell
interference, the at least one controlled condition is a serving
grant threshold of the UE and multiple monitoring thresholds for
monitoring common E-RGCH channel; and the determination unit
determining whether the UE satisfies the at least one controlled
condition specifically is: determining whether the serving grant of
the UE is higher than the serving grant threshold and which range
among multiple ranges limited by the multiple monitoring thresholds
the measurement result of the UE is in, where when the serving
grant of the UE is higher than the serving grant threshold and the
measurement result of the UE is in a specified range limited by the
multiple monitoring thresholds, the determination unit determines
that the UE satisfies the at least one controlled condition.
[0068] In the above apparatus, the measurement result of the UE
includes at least one of the following: a path loss difference
between the cell to which the UE belongs and the neighboring cell,
and that the UE detects that a measurement result of a CPICH
channel of the neighboring cell reaches a threshold for reporting a
measurement event.
[0069] In addition, details in the descriptions about the above
method for controlling a serving grant of a user terminal of a
neighboring cell may also be equivalently applied to the apparatus
for controlling a serving grant of a user terminal of a neighboring
cell, which is not repeated again for simplicity.
[0070] In addition, persons skilled in the art can understand that,
the above apparatus for controlling a serving grant of a user
terminal of a neighboring cell may be set at the end of a user
equipment, or set at the end of a base station, or set at one end
of an RNC, and is used for controlling the working state of each
user equipment to reduce interference of the user equipment on the
neighboring cell. In addition, in replace of being wholly setting
in the user equipment, the above apparatus for controlling a
serving grant of a user terminal of a neighboring cell may also be
distributed in a communication system formed of a user equipment, a
base station and an RNC. For example, the setting unit of the above
apparatus for controlling neighboring cell interference is set in
an RNC, so that in addition to broadcasting a primary scrambling
code of each neighboring cell and a channelization code of a common
E-RGCH to each UE, the RNC further broadcasts the at least one
controlled condition to each UE; the determination unit is set in a
UE, so that the UE determines, for example, a SG condition or a
monitoring condition, based on a working state of the UE; and the
control unit is set in a base station, so as to control a working
state of each UE. Definitely, persons skilled in the art can
understand that, the above setting unit may be set in a UE or a
base station and the above determination unit may also be set in a
base station or an RNC, so as to perform determination by obtaining
the working state of each UE, the control unit may also be set in
an RNC or a user equipment, and the embodiment of the present
invention is not intended to impose any limitation on this.
[0071] Through the method and the apparatus for controlling a
serving grant of a user terminal of a neighboring cell, the user
terminal, the base station, the radio network controller and the
communication system according to the embodiments of the present
invention, interference control may be performed on a UE in the
CELL-FACH state or in the idle state of the neighboring cell, and
at the same time, throughput of the UE may be prevented from being
reduced excessively, thereby improving communication
performance.
[0072] Persons of ordinary skill in the art can be aware that, in
combination with the examples described in the embodiments
disclosed in this specification, units and algorithm steps may be
implemented by electronic hardware, computer software, or a
combination of the two. In order to clearly describe the
interchangeability between the hardware and the software, the
foregoing has generally described compositions and steps of every
embodiment according to functions. Whether the functions are
performed by hardware or software depends on particular
applications and design constraint conditions of the technical
solutions. Persons skilled in the art may use different methods to
implement the described functions for each particular application,
but it should not be considered that the implementation goes beyond
the scope of the present invention.
[0073] It may be clearly understood by persons skilled in the art
that, for the purpose of convenient and brief description, for
detailed working processes of the foregoing system, apparatus, and
unit, reference may be made to a corresponding process in the
foregoing method embodiments, and details are not described herein
again.
[0074] In the several embodiments provided in the present
application, it should be understood that the disclosed system,
apparatus, and method may be implemented in other manners. For
example, the described apparatus embodiment is merely exemplary.
For example, the unit division is merely logical function division
and may be other division in actual implementation. For example, a
plurality of units or components may be combined or integrated into
another system, or some features may be ignored or not performed.
In addition, the displayed or discussed mutual couplings or direct
couplings or communication connections may be implemented through
some interfaces. The indirect couplings or communication
connections between the apparatuses or units may be implemented in
electronic, mechanical or other forms.
[0075] The units described as separate parts may or may not be
physically separate, and parts displayed as units may or may not be
physical units, may be located in one position, or may be
distributed on a plurality of network units. A part or all of the
units may be selected according to the actual needs to achieve the
objectives of the solutions of the embodiments.
[0076] In addition, functional units in the embodiments of the
present invention may be integrated into one processing unit, or
each of the units may exist alone physically, or two or more units
are integrated into one unit. The integrated unit may be
implemented in the form of hardware, or may be implemented in the
form of a software functional unit.
[0077] When the integrated unit are implemented in the form of a
software functional unit and sold or used as an independent
product, the integrated unit may be stored in a computer-readable
storage medium. Based on such an understanding, the technical
solutions of the present invention essentially, or the part
contributing to the prior art, or all or a part of the technical
solutions may be implemented in the form of a software product. The
computer software product is stored in a storage medium and
includes several instructions for instructing a computer device
(which may be a personal computer, a server, or a network device)
to perform all or a part of steps of the methods described in the
embodiments of the present invention. The foregoing storage medium
includes: any medium that can store program codes, such as a USB
flash disk, a removable hard disk, a read-only memory (ROM,
Read-Only Memory), a random access memory (RAM, Random Access
Memory), a magnetic disk, or an optical disk.
[0078] The foregoing descriptions are merely specific embodiments
of the present invention, but are not intended to limit the
protection scope of the present invention. Any variation or
replacement readily figured out by persons skilled in the art
within the technical scope disclosed in the present invention shall
fall within the protection scope of the present invention.
Therefore, the protection scope of the present invention shall be
subject to the protection scope of the claims.
* * * * *