Feedback information transmission method in communications system and apparatus

Patent metadata

Field	Value
Publication number	US-10225050-B2
Application number	US-201715663378-A
Country	US
Kind code	B2
Filing date	Jul 28, 2017
Priority date	Jan 30, 2015
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

Embodiments of the present invention provide a feedback information transmission method in a communications system and an apparatus. In this method, UE may determine a codebook size of the feedback information according to a status of a downlink subframe scheduled by the base station.

First claim

What is claimed is:

1. A method, comprising:
receiving, by user equipment (UE), downlink data;
determining, by the UE, an uplink subframe for feeding back feedback information corresponding to the downlink data, and determining a first downlink subframe set associated with the uplink subframe, wherein the first downlink subframe set comprises a first subset and a second subset, and the first subset is a proper subset of the second subset, or the first subset partially overlaps with the second subset;
determining, by the UE, a codebook size of the feedback information, wherein the codebook size is a first codebook size or a second codebook size, the first codebook size corresponds to a quantity of downlink subframes comprised in the first subset, and the second codebook size corresponds to a quantity of downlink subframes comprised in the second subset;
encoding, by the UE, the feedback information according to the codebook size, to obtain encoded feedback information; and
mapping, by the UE, the encoded feedback information to a physical uplink shared channel PUSCH, and sending the encoded feedback information to a base station in the uplink subframe by using the PUSCH.

2. The method according to claim 1 , wherein, when the codebook size is the first codebook size, encoding, by the UE, the feedback information according to the codebook size, to obtain encoded feedback information comprises encoding, by the UE, the feedback information according to the first codebook size, to obtain first encoded feedback information; and
wherein, when the codebook size is the first codebook size, mapping, by the UE, the encoded feedback information to the PUSCH comprises:
determining, by the UE, a first proportion factor configured by the base station, and determining a first quantity of symbols according to the first proportion factor, wherein the first quantity of symbols is a quantity of symbols that need to be occupied to map the first encoded feedback information to the PUSCH; and
mapping, by the UE, the first encoded feedback information to the PUSCH according to the first quantity of symbols;

wherein, when the codebook size is the second codebook size, encoding, by the UE, the feedback information according to the codebook size, to obtain encoded feedback information comprises encoding, by the UE, the feedback information according to the second codebook size, to obtain second encoded feedback information; and
wherein, when the codebook size is the second codebook size, mapping, by the UE, the encoded feedback information to a PUSCH comprises:
determining, by the UE, a second proportion factor configured by the base station, and determining a second quantity of symbols according to the second proportion factor, wherein the second quantity of symbols is a quantity of symbols that need to be occupied to map the second encoded feedback information to the PUSCH; and
mapping, by the UE, the second encoded feedback information to the PUSCH according to the second quantity of symbols.

3. The method according to claim 2 , wherein the first proportion factor and the second proportion factor are independently configured by the base station.

4. The method according to claim 1 , further comprising:
determining, by the UE, the first subset and the second subset according to a pre-configured rule.

5. The method according to claim 4 , wherein determining, by the UE, the first subset and the second subset according to the pre-configured rule comprises:
determining a downlink subframe according to a carrier number or a subframe number, wherein the downlink subframe belongs to the first subset or the second subset.

6. The method according to claim 5 , wherein the downlink subframe is determined first according to a frequency-domain carrier number and then according to a time-domain subframe number.

7. The method according to claim 1 , wherein the quantity of downlink subframes in the first subset is not greater than a ACK/NACK bit quantity threshold; or
wherein the quantity of downlink subframes in the second subset is greater than a ACK/NACK bit quantity threshold.

8. The method according to claim 7 , wherein the ACK/NACK bit quantity threshold is 22.

9. User equipment (UE), comprising:
a receiver, configured to receive downlink data;
a processor, configured to:
determine an uplink subframe used for feeding back feedback information corresponding to the downlink data, and determine a first downlink subframe set associated with the uplink subframe, wherein the downlink data is received by the receiver, the first downlink subframe set comprises a first subset and a second subset, and the first subset is a proper subset of the second subset;
determine a codebook size of the feedback information, wherein the codebook size is a first codebook size or a second codebook size, the first codebook size corresponds to a quantity of downlink subframes comprised in the first subset, and the second codebook size corresponds to a quantity of downlink subframes comprised in the second subset;
encode the feedback information according to the codebook size, to obtain encoded feedback information; and
map the encoded feedback information to a physical uplink shared channel (PUSCH), and control a transmitter to send, in the uplink subframe, the encoded feedback information by using the PUSCH; and

the transmitter, configured to send the encoded feedback information to a base station in the uplink subframe using the PUSCH.

10. The UE according to claim 9 , wherein the processor is further configured to:
when the codebook size is the first codebook size, encode the feedback information according to the first codebook size, to obtain first encoded feedback information; determine a first proportion factor configured by the base station, and determine a first quantity of symbols according to the first proportion factor, wherein the first quantity of symbols is a quantity of symbols that need to be occupied to map the first encoded feedback information to the PUSCH; and map the first encoded feedback information to the PUSCH according to the first quantity of symbols; and
when the codebook size is the second codebook size, encode the feedback information according to the second codebook size, to obtain second encoded feedback information; determine a second proportion factor configured by the base station, and determine a second quantity of symbols according to the second proportion factor, wherein the second quantity of symbols is a quantity of symbols that need to be occupied to map the second encoded feedback information to the PUSCH; and map the second encoded feedback information to the PUSCH according to the second quantity of symbols.

11. The UE according to claim 10 , wherein the first proportion factor and the second proportion factor are independently configured by the base station.

12. The UE according to claim 9 , wherein the processor is further configured to:
determine the first subset and the second subset according to a pre-configured rule.

13. The UE according to claim 12 , the processor is further configured to:
determine a downlink subframe according to a carrier number and a subframe number, wherein the downlink subframe belongs to the first subset or the second subset.

14. The UE according to claim 13 , wherein the downlink subframe is determined first according to a frequency-domain carrier number and then according to a time-domain subframe number.

15. The UE according to claim 9 , wherein the quantity of downlink subframes in the first subset is not greater than a ACK/NACK bit quantity threshold; or
wherein the q

Assignees

• Huawei Tech Co Ltd

Inventors

• Guan Lei
• Ma Sha
• Yan Zhiyu
• Cheng Yan
• Chen Xiaobo

Classifications

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04L1/1864 Primary

  ARQ related signaling (H04L1/1607 takes precedence) · CPC title

• H04L1/0073

  Special arrangements for feedback channel · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/23

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