Techniques for handling feedback for downlink transmissions in a shared radio frequency spectrum band

Patent metadata

Field	Value
Publication number	US-2016353474-A1
Application number	US-201615164837-A
Country	US
Kind code	A1
Filing date	May 25, 2016
Priority date	May 27, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

Techniques are described for wireless communication. A first method may include classifying feedback received for a first downlink transmission over a shared radio frequency spectrum band; identifying an interference parameter for a subsequent downlink transmission; and scheduling the subsequent downlink transmission based at least in part on feedback classified in a feedback category associated with the identified interference parameter for the subsequent downlink transmission. The feedback may be classified in one of a plurality of feedback categories, and the classifying may be based at least in part on an interference parameter for the first downlink transmission. A second method may include identifying an interference parameter for a first downlink transmission received over a shared radio frequency spectrum band; generating feedback for the first downlink transmission; and sending, to a base station, the feedback along with an indication of the interference parameter.

First claim

What is claimed is:

1 . A method for wireless communication at a base station, comprising:
classifying feedback received for a first downlink transmission over a shared radio frequency spectrum band, the feedback classified in one of a plurality of feedback categories, the classifying based at least in part on an interference parameter for the first downlink transmission; identifying an interference parameter for a subsequent downlink transmission; and scheduling the subsequent downlink transmission based at least in part on feedback classified in a feedback category associated with the identified interference parameter for the subsequent downlink transmission.

2 . The method of claim 1 , wherein the interference parameter for the first downlink transmission comprises one of transmission in a reuse one mode or transmission in a time domain multiplexed (TDM) mode.

3 . The method of claim 2 , wherein classifying feedback received for the first downlink transmission comprises:
classifying feedback received for the first downlink transmission in a first feedback category based at least in part on the interference parameter for the first downlink transmission comprising transmission of the first downlink transmission in the reuse one mode.

4 . The method of claim 3 , further comprising
classifying feedback for a second downlink transmission in a second feedback category based at least in part on an interference parameter for the second downlink transmission comprising transmission of the second downlink transmission in the TDM mode.

5 . The method of claim 1 , wherein the feedback comprises channel state information (CSI), or acknowledgement/non-acknowledgement (ACK/NACK) feedback, or a combination thereof.

6 . The method of claim 1 , wherein scheduling the subsequent downlink transmission comprises:
selecting a modulation and coding scheme (MCS) for the subsequent downlink transmission.

7 . The method of claim 1 , further comprising:
identifying the interference parameter for the first downlink transmission.

8 . The method of claim 7 , wherein identifying the interference parameter for the first downlink transmission comprises:
receiving an indication of the interference parameter with the feedback for the first downlink transmission.

9 . The method of claim 1 , wherein identifying the interference parameter for the subsequent downlink transmission comprises:
receiving a transmission status from at least one other base station; and identifying the interference parameter for the subsequent downlink transmission based at least in part on the transmission status.

10 . The method of claim 9 , wherein the base station and the at least one other base station belong to a same public land mobile network (PLMN).

11 . The method of claim 9 , wherein receiving the transmission status comprises:
receiving a channel usage beacon signal (CUBS), or a physical frame format indicator channel (PFFICH), or a combination thereof.

12 . The method of claim 1 , further comprising:
maintaining, for each feedback category of the plurality of feedback categories, at least one of a separate hybrid automatic repeat request (HARQ) feedback outer loop or a separate channel state information (CSI) feedback outer loop; wherein the subsequent downlink transmission is scheduled based at least in part on one or both of a HARQ feedback outer loop and a CSI feedback outer loop associated with the feedback category associated with the interference parameter for the subsequent downlink transmission.

13 . The method of claim 1 , further comprising:
skipping, upon classifying the feedback received for the first downlink transmission in a first feedback category, at least one update of at least one of: a hybrid automatic repeat request (HARD) feedback outer loop associated with a second feedback category or a channel state information (CSI) feedback outer loop associated with the second category.

14 . An apparatus for wireless communication at a base station, comprising:
a processor; and memory coupled to the processor, wherein the processor is configured to:
classify feedback received for a first downlink transmission over a shared radio frequency spectrum band, the feedback classified in one of a plurality of feedback categories, the classifying based at least in part on an interference parameter for the first downlink transmission;
identify an interference parameter for a subsequent downlink transmission; and
schedule the subsequent downlink transmission based at least in part on feedback classified in a feedback category associated with the identified interference parameter for the subsequent downlink transmission.

15 . The apparatus of claim 14 , wherein the interference parameter for the first downlink transmission comprises one of transmission in a reuse one mode or transmission in a time domain multiplexed (TDM) mode.

16 . The apparatus of claim 14 , wherein the feedback comprises channel state information (CSI), or acknowledgement/non-acknowledgement (ACK/NACK) feedback, or a combination thereof.

17 . The apparatus of claim 14 , wherein the processor is configured to:
select a modulation and coding scheme (MCS) for the subsequent downlink transmission.

18 . The apparatus of claim 14 , wherein the processor is configured to:
identify the interference parameter for the first downlink transmission.

19 . The apparatus of claim 18 , wherein the processor is configured to:
receive an indication of the interference parameter with the feedback for the first downlink transmission.

20 . The apparatus of claim 14 , wherein the processor is configured to:
receive a transmission status from at least one other base station; and identify the interference parameter for the subsequent downlink transmission based at least in part on the transmission status.

21 . The apparatus of claim 14 , wherein the processor is configured to:
maintain, for each feedback category of the plurality of feedback categories, at least one of a separate hybrid automatic repeat request (HARQ) feedback outer loop or a separate channel state information (CSI) feedback outer loop; wherein the subsequent downlink transmission is scheduled based at least in part on one or both of a HARQ feedback outer loop and a CSI feedback outer loop associated with the feedback category associated with the interference parameter for the subsequent downlink transmission.

22 . The apparatus of claim 14 , wherein the processor is configured to:
skip, upon classifying the feedback received for the first downlink transmission in a first feedback category, at least one update of at least one of: a hybrid automatic repeat request (HARQ) feedback outer loop associated with a second feedback category or a channel state information (CSI) feedback outer loop associated with the second category.

23 . A method for wireless communication at a user equipment (UE), comprising:
identifying an interference parameter for a first downlink transmission received over a shared radio frequency spectrum band; generating feedback for the first downlink transmission; and sending, to a base station, the feedback along with an indication of the interference parameter.

24 . The method of claim 23 , wherein identifying the interference parameter comprises:
receiving a transmission status from at least one neighboring base station; and identifying the interferen

Assignees

• Qualcomm Inc

Inventors

• Zhang Xiaoxia
• Luo Tao
• Chendamarai Kannan Arumugam
• Liu Zhengwei

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04B7/0626 Primary

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04L27/2691

  involving interference determination or cancellation · CPC title

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title

• H04L1/20

  using signal quality detector · CPC title