EP-4740333-A1 - SYSTEMS, APPARATUS, AND METHODS FOR REDUNDANCY VERSION OF LOW DENSITY PARITY CHECK CODE

Abstract

Bits from a low density parity check (LDPC) coded bit sequence, obtained by encoding an input bit sequence, are transmitted in an initial transmission. In a further transmission, further bits from the coded bit sequence are transmitted. The further bits are bits from the coded bit sequence that were not included in the initial transmission. The further transmission is determined, by selection for example, from among a number of further transmissions that have associated self-decodability and combining gain properties. The determination of the further transmission from among the number of further transmissions is based on a traffic handling property that is related to the coded bit sequence.

Inventors

• VU, Van Hung
• CAO, YU
• ZHANG, Huazi
• WEI, Haoyuan

Assignees

• Huawei Technologies Co., Ltd.

Dates

Publication Date

20260513

Application Date

20231101

Claims (20)

1. A method comprising: transmitting, in an initial transmission, bits from a low density parity check (LDPC) coded bit sequence; and transmitting, in a further transmission, further bits from the LDPC coded bit sequence; the further transmission having been determined, based on a traffic handling property related to the coded bit sequence, from among a plurality of further transmissions that have associated self-decodability and combining gain properties.
2. The method of claim 1, wherein the traffic handling property comprises a traffic priority associated with the LDPC coded bit sequence.
3. The method of claim 1, wherein the traffic handling property comprises a quality of service associated with the LDPC coded bit sequence.
4. The method of claim 1, wherein the traffic handling property comprises a repetition configuration.
5. The method of claim 1, wherein the traffic handling property comprises grant-free scheduling.
6. The method of claim 1, wherein the traffic handling property comprises autonomous retransmission.
7. The method of claim 1, wherein the traffic handling property comprises pre-emption of a portion of the bits from the LDPC coded bit sequence for inclusion in the initial transmission.
8. The method of claim 7, further comprising: transmitting an indication of the pre-emption.
9. The method of claim 1, wherein the traffic handling property comprises a code rate associated with the initial transmission.
10. The method of any one of claims 1 to 9, further comprising: receiving an indication of selection of the further transmission from among the plurality of further transmissions based on the traffic handling property, wherein the further transmission is determined based on the indication.
11. The method of any one of claims 1 to 9, further comprising: transmitting an indication of selection of the further transmission from among the plurality of further transmissions based on the traffic handling property.
12. A method comprising: receiving a further transmission that includes further bits from a low density parity check (LDPC) coded bit sequence, further to bits from the LDPC coded bit sequence included in an initial transmission, the further transmission having been determined, based on a traffic handling property related to the coded bit sequence, from among a plurality of further transmissions that have associated self-decodability and combining gain properties, the method further comprising: decoding the further transmission.
13. The method of claim 12, wherein the traffic handling property comprises a traffic priority associated with the LDPC coded bit sequence.
14. The method of claim 12, wherein the traffic handling property comprises a quality of service associated with the LDPC coded bit sequence.
15. The method of claim 12, wherein the traffic handling property comprises a repetition configuration.
16. The method of claim 12, wherein the traffic handling property comprises grant-free scheduling.
17. The method of claim 12, wherein the traffic handling property comprises autonomous retransmission.
18. The method of claim 12, wherein the traffic handling property comprises pre-emption of a portion of the bits from the LDPC coded bit sequence for inclusion in the initial transmission.
19. The method of claim 18, further comprising: receiving an indication of the pre-emption.
20. The method of claim 12, wherein the traffic handling property comprises a code rate associated with the initial transmission.

Description

Systems, Apparatus, and Methods for Redundancy Version of Low Density Parity Check Code CROSS-REFERENCE TO RELATED APPLICATION The present application is related to, and claims priority to, United States provisional patent application Serial No. 63/514,883, entitled "System, Apparatus, and Method for Redundancy Version of LDPC Code" , filed on July 21, 2023, the entire contents of which are hereby incorporated by reference. TECHNICAL FIELD The present application relates to communications, and in particular to low density parity check (LDPC) coding and redundancy versions (RVs) for LDPC codes. BACKGROUND In wireless communications, redundancy schemes such as Hybrid Automatic Repeat Request (HARQ) may be used to reduce or eliminate errors introduced by noise or interference in a communication channel. HARQ combines forward error correction with a retransmission scheme, which may define one or more different versions of an initial transmission. The different transmission versions are also known as redundancy versions (RVs) . It is desirable to improve the performance of redundancy versions according to various general and/or specific criteria. Performance may be improved, for example, by providing for RV configurations that support high self-decodability and incremental redundancy (IR) combining gain. SUMMARY Some aspects of the present disclosure relate to RVs with high self-decodable ability ( “self-decodability” ) . Some aspects of the present disclosure relate to RVs with good IR combining gain. Some aspects of the present disclosure relate to RVs with both high self-decodability and good IR combining gain. According to an aspect of the present disclosure, a method involves transmitting, in an initial transmission, bits from an LDPC coded bit sequence; and transmitting, in a further transmission, further bits from the LDPC coded bit sequence. The further transmission is determined, based on a traffic handling property related to the coded bit sequence, from among a number of further transmissions that have associated self-decodability and combining gain properties. Another aspect of the present disclosure involves receiving and decoding a further transmission that includes further bits from an LDPC coded bit sequence. The further bits are further to bits from the LDPC coded bit sequence included in an initial transmission. The further transmission is determined from among a number of further transmissions, based on a traffic handling property related to the coded bit sequence. The number of further transmissions have associated self-decodability and combining gain properties. An apparatus according to a further aspect of the present disclosure includes an encoder for encoding an input bit sequence by an LDPC code to obtain an LDPC coded bit sequence, and an interface, coupled to the encoder: for transmitting, in an initial transmission, bits from the LDPC coded bit sequence; and for transmitting, in a further transmission, further bits from the LDPC coded bit sequence. Based on a traffic handling property related to the coded bit sequence, the further transmission is determined, from among a number of further transmissions that have associated self-decodability and combining gain properties. An apparatus may include an interface for receiving a further transmission that includes further bits from an LDPC coded bit sequence, and a decoder, coupled to the interface, for decoding the further transmission. The further bits are further to bits from the LDPC coded bit sequence included in an initial transmission, and the further transmission is determined, based on a traffic handling property related to the coded bit sequence, from among a number of further transmissions that have associated self-decodability and combining gain properties. In other apparatus examples, an apparatus may include a processor configured to cause the apparatus to perform any of the methods as disclosed herein. An apparatus may include a processor and a non-transitory computer readable storage medium that is coupled to the processor and stores programming for execution by the processor. A storage medium need not necessarily or only be implemented in or in conjunction with such an apparatus. A computer program product, for example, may be or include a non-transitory computer readable medium storing programming for execution by a processor. Programming stored by a computer readable storage medium may include instructions to, or to cause a processor to, perform, implement, support, or enable any of the methods disclosed herein. A system is also disclosed, and may include a first communication device and a second communication device. The first communication device may be configured to encode an input bit sequence by an LDPC code to obtain an LDPC coded bit sequence; to transmit, in an initial transmission, bits from the LDPC coded bit sequence; and to transmit, in a further transmission, further bits from the LDPC coded bit sequence. The