Techniques for handling channel state information (csi) in ultra low latency (ull) lte

Patent metadata

Field	Value
Publication number	US-2016205676-A1
Application number	US-201514977163-A
Country	US
Kind code	A1
Filing date	Dec 21, 2015
Priority date	Jan 12, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

Techniques for handling Channel State Information (CSI) for ultra low latency (ULL) in Long Term Evolution (LTE) devices are presented. For example, an example method of reporting CSI to a network entity is presented. Such an example method may include detecting a CSI reporting trigger for reporting CSI to the network entity and identifying, based on detection of the CSI reporting trigger, a subframe region for which the CSI is to be generated. In an aspect, the subframe region is included in a plurality of subframe regions, where each subframe region of the plurality of subframe regions includes at least one symbol of a subframe. In an additional aspect, the example method may include generating the CSI based on the subframe region and transmitting the CSI to the network entity.

First claim

What is claimed is:

1 . A method of reporting channel state information (CSI) to a network entity, comprising:
detecting a CSI reporting trigger for reporting CSI to the network entity; identifying, based on detection of the CSI reporting trigger, a subframe region for which the CSI is to be generated, wherein the subframe region is included in a plurality of subframe regions, and wherein each subframe region of the plurality of subframe regions comprises at least one symbol of a subframe; generating the CSI based on the subframe region; and transmitting the CSI to the network entity.

2 . The method of claim 1 , wherein the subframe region comprises a control region, the control region including at least one symbol during which information is transmitted via one or more control channels.

3 . The method of claim 2 , further comprising receiving at least one common reference signal (CRS) in the control region, and wherein generation of the CSI includes generating the CSI based on the at least one CRS received in the control region.

4 . The method of claim 1 , wherein the subframe region comprises a data region, the data region including at least one symbol during which information is transmitted via one or more data channels.

5 . The method of claim 4 , further comprising performing an Interference Measurement Resource (IMR) measurement of an IMR, and wherein generation of the CSI includes generating the CSI based on the IMR measurement.

6 . The method of claim 1 , wherein the subframe region comprises a grey region, the grey region including at least one symbol during which information is transmitted via one or both of one or more control channels or one or more data channels.

7 . The method of claim 6 , further comprising identifying one or more resource element groups (REGs) in the grey region for interference measurement; and
measuring interference associated with the one or more REGs to obtain an interference measurement, wherein generation of the CSI further includes generating the CSI based on the interference measurement.

8 . The method of claim 1 , further comprising determining whether the CSI reporting trigger is associated with a first transmit time interval (TTI), wherein the first TTI is less a second TTI, and wherein legacy communications with the network entity use the second TTI.

9 . The method of claim 8 , wherein generation of the CSI is performed over a plurality of subbands, where a subband size for the CSI is larger than a subband size associated with generation of CSI for the second TTI.

10 . The method of claim 8 , wherein the CSI for the first TTI is restricted compared with the CSI for the second TTI, wherein the first TTI is restricted by implementing one or more of a reduced set of ranks, a reduced set of precoding matrix indicators, a reduced set of CSI reporting types, or a reduced performance requirement for the first TTI.

11 . The method of claim 8 , further comprising determining that a prior CSI transmitted to the network entity was based on a prior CSI reporting trigger associated with the second TTI, and wherein generation of the CSI comprises generating a differential CSI relative to the prior CSI.

12 . The method of claim 1 , wherein the CSI reporting trigger is at least one of a configuration for periodic CSI reporting or an indication in a control channel for aperiodic CSI reporting.

13 . An apparatus for reporting channel state information (CSI) to a network entity, comprising:
means for detecting a CSI reporting trigger for reporting CSI to the network entity; means for identifying, based on detection of the CSI reporting trigger, a subframe region for which the CSI is to be generated, wherein the subframe region is included in a plurality of subframe regions, and wherein each subframe region of the plurality of subframe regions comprises at least one symbol of a subframe; means for generating the CSI based on the subframe region; and means for transmitting the CSI to the network entity.

14 . The apparatus of claim 13 , wherein the subframe region comprises a grey region, the grey region including at least one symbol during which information is transmitted via one or more control channels, one or more data channels, or any combination thereof.

15 . The apparatus of claim 14 , further comprising:
means for identifying one or more resource element groups (REGs) in the grey region for interference measurement; and means for measuring interference associated with the one or more REGs to obtain an interference measurement, wherein the means for generating the CSI comprise means for generating the CSI based on the interference measurement.

16 . A non-transitory computer-readable medium storing computer-executable code for reporting channel state information (CSI) to a network entity, the code comprising instructions executable to:
detect a CSI reporting trigger for reporting CSI to the network entity; identify, based on detection of the CSI reporting trigger, a subframe region for which the CSI is to be generated, wherein the subframe region is included in a plurality of subframe regions, and wherein each subframe region of the plurality of subframe regions comprises at least one symbol of a subframe; generate the CSI based on the subframe region; and transmit the CSI to the network entity.

17 . The computer-readable medium of claim 16 , wherein the subframe region comprises a grey region, the grey region including at least one symbol during which information is transmitted via one or more control channels, one or more data channels, or any combination thereof.

18 . The computer-readable medium of claim 17 , the code comprising instructions executable to:
identify one or more resource element groups (REGs) in the grey region for interference measurement; and measure interference associated with the one or more REGs to obtain an interference measurement, wherein the instructions executable to generate the CSI comprise instructions executable to generate the CSI based on the interference measurement.

19 . An apparatus for reporting channel state information (CSI) to a network entity, comprising:
a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being executable by the processor to:
detect a CSI reporting trigger for reporting CSI to the network entity;
identify, based on detection of the CSI reporting trigger, a subframe region for which the CSI is to be generated, wherein the subframe region is included in a plurality of subframe regions, and wherein each subframe region of the plurality of subframe regions comprises at least one symbol of a subframe;
generate the CSI based on the subframe region; and
transmit the CSI to the network entity.

20 . The apparatus of claim 19 , wherein the subframe region comprises a control region, the control region including at least one symbol during which information is transmitted via one or more control channels.

21 . The apparatus of claim 20 , wherein the instructions further comprise instructions being executable by the processor to receive at least one common reference signal (CRS) in the control region, and wherein the instructions executable to generate the CSI comprise instructions executable by the processor to generate the CSI based on the at least one CRS received in the control region.

22 . The apparatus of claim 19 , wherein the subframe region comp

Assignees

• Qualcomm Inc

Inventors

• Chen Wanshi
• Patel Shimman Arvind
• Gaal Peter
• Xu Hao
• Luo Tao

Classifications

• H04B7/0632

  Channel quality parameters, e.g. channel quality indicator [CQI] · CPC title

• H04B17/26

  using historical data, averaging values or statistics · CPC title

• H04B17/24

  with feedback of measurements to the transmitter · CPC title

• H04W72/20 Primary

  Control channels or signalling for resource management · CPC title

• H04B7/0621

  Feedback content · CPC title