Method and apparatus for implementing channel measurement

• US 9,673,883 B2
• Filed: 04/27/2012
• Issued: 06/06/2017
• Est. Priority Date: 10/28/2009
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wang, Jianguo, Cheng, Xingqing, Zhao, Yajun, Wu, Zuomin, Cheng, Yan
• Primary Examiner(s): SMITH, MARCUS
• Application Number:
  US13/458,273
• Publication Number:
  US 20120213113A1
• Time in Patent Office: 1,866 Days
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

A method and an apparatus for implementing channel measurement are disclosed in the present invention. The method includes: determining an antenna port subset, which is required to be measured, for a UE according to current state information of the user equipment UE; and informing the UE to perform channel measurement for the subset of antenna ports that is required to be measured and feed back channel state information. Through the present invention, when the state information of the UE meets a certain condition, the UE measures only the reference signals of a part of antenna ports, and feeds back channel state information for this part of antenna ports. Therefore, the overhead generated by the feedback of the UE to the channel state information is reduced.

Claims

1. A method for implementing channel measurement, comprising:

determining, by a base station, a transmission mode of a user equipment (UE), wherein the transmission mode is a coordinated multi-point transmission (CoMP) transmission mode;

selecting, by the base station according to the CoMP transmission mode, an antenna port subset from antenna port subsets of antenna ports of the base station for the UE partitioned into the antenna port subsets according to antenna geographic locations to obtain channel quality for the selected antenna port subset only based on a channel state information reference signal transmitted from at least one antenna port included in the selected antenna port subset which excludes other channel state information reference signal transmitted from an antenna port excluded from the selected antenna port subset;

informing, by the base station, the UE of information of the selected antenna port subset; and

in response to the informing, receiving, by the base station from the UE, channel state information in accordance with a channel measurement only for the selected antenna port subset based on the channel state information reference signal transmitted from the at least one antenna port included in the selected antenna port subset which excludes the other channel state information reference signal transmitted from the antenna port excluded from the selected antenna port subset,

wherein the selecting the antenna port subset includes selecting the antenna port subset which path loss to the UE meets a condition according to path loss information between the UE and the selected antenna port subset.

2. The method according to claim 1, further comprising:

performing, by the base station, radio resource scheduling in accordance with the received channel state information for the UE.

3. A base station, comprising:

a transceiver, and

a processor coupled with the transceiver, wherein

the processor is configured to;

determine a transmission mode of a user equipment (UE)), wherein the transmission mode is a coordinated multi-point transmission (CoMP) transmission mode,

select, according to the CoMP transmission mode, an antenna port subset from antenna port subsets of antenna ports of the base station for the UE partitioned into the antenna port subsets according to antenna geographic locations, to obtain channel quality for the selected antenna port subset only based on a channel state information reference signal transmitted from at least one antenna port included in the selected antenna port subset which excludes other channel state information reference signal transmitted from an antenna port excluded from the selected antenna port subset, and

inform, via the transceiver, the UE of information of the selected antenna port subset; and

the transceiver is configured to;

receive, from the UE, channel state information in accordance with a channel measurement only for the selected antenna port subset based on the channel state information reference signal transmitted from the at least one antenna port included in the selected antenna port subset which excludes the other channel state information reference signal transmitted from the antenna port excluded from the selected antenna port subset,

wherein the selected antenna port subset has a path loss to the UE that meets a condition according to path loss information between the UE and the selected antenna port subset.

4. The apparatus according to claim 3, wherein the processor is further configured to perform, via the transceiver, radio resource scheduling in accordance with the received channel state information for the UE.

5. A non-transitory computer program product, comprising computer program code, which, when executed by a computer unit, will cause the computer unit to perform:

determining a transmission mode of a user equipment (UE)), wherein the transmission mode is a coordinated multi-point transmission (CoMP) transmission mode;

selecting, according to the CoMP transmission mode, an antenna port subset from antenna port subsets of antenna ports of the base station for the UE partitioned into the antenna port subsets according to antenna geographic locations, to obtain channel quality for the selected antenna port subset only based on a channel state information reference signal transmitted from at least one antenna port included in the selected antenna port subset which excludes other channel state information reference signal transmitted from an antenna port excluded from the selected antenna port subset;

informing the UE of information of the selected antenna port subset; and

in response to the informing, receiving, through a receiver from the UE, channel state information sent in accordance with a channel measurement only for the selected antenna port subset based on the channel state information reference signal transmitted from the at least one antenna port included in the selected antenna port subset which excludes the other channel state information reference signal transmitted from the antenna port excluded from the selected antenna port subset,

wherein

the selecting the antenna port subset includes selecting the antenna port subset which path loss to the UE meets a condition according to path loss information between the UE and the selected antenna port subset.