Uplink retransmitted data sending method, apparatus, and system

• US 10,667,291 B2
• Filed: 06/22/2018
• Issued: 05/26/2020
• Est. Priority Date: 12/24/2015
• 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: Sun, Hao, Cheng, Yan
• Primary Examiner(s): Ng, Christine
• Application Number:
  US16/015,894
• Publication Number:
  US 20180302919A1
• Time in Patent Office: 704 Days
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0085 when channel conditions change
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

The present disclosure discloses an uplink retransmitted data sending method, apparatus, and system, and relates to the field of communications technologies. The method includes: receiving data transmitted on a same contention resource by different user equipments (UEs) that are in a same contention resource group; demodulating, based on a demodulation reference signal DMRS sequence carried in the data, the data sent by the UEs; and when demodulation of data sent by at least two UEs fails, scheduling, by using an uplink grant (UL-grant), the UEs whose data fails to be demodulated, to retransmit the data on a designated non-contention resource. This resolves a prior-art technical problem that uplink data retransmission fails, and improves uplink data retransmission efficiency.

Claims

1. An uplink retransmitted data sending method, applied to user equipment (UE), the method comprising:

sending data to a base station on a contention resource allocated by the base station, wherein the contention resource is a time-frequency resource that is designated when the base station schedules UEs in a contention resource group by using a contention-based grant (CB-grant);

after sending the data, performing blind detection on an uplink grant (UL-grant); and

in response to not detecting the UL-grant through blind detection;

detecting whether a positive acknowledgment that is corresponding to the UE and that is fed back by the base station is received; and

in response to detecting that the positive acknowledgment that is corresponding to the UE and that is fed back by the base station is not received, retransmitting the data on the resource indicated by the CB-grant delivered by the base station.

2. The method according to claim 1, wherein performing blind detection on a UL-grant comprises:

extracting preset information from the UL-grant, wherein the preset information is configured by the base station as information that can be successfully identified only by one UE;

identifying the preset information in a preset manner; and

after the preset information is successfully identified, determining that the UL-grant is successfully found through blind detection.

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

performing blind detection on a second UL-grant;

in response to detecting the second UL-grant through blind detection, retransmitting the data on a non-contention resource indicated by the second UL-grant.

4. The method according to claim 1, wherein retransmitting the data on the resource indicated by the CB-grant delivered by the base station comprises:

obtaining an effective time of a last CB-grant received from the base station;

when a current moment does not exceed the effective time, retransmitting the data on the contention resource; and

when a current moment exceeds the effective time, waiting for a next CB-grant sent by the base station, and after receiving the next CB-grant, retransmitting the data on a resource indicated by the next CB-grant.

5. An uplink retransmitted data sending apparatus, applied to user equipment (UE), the apparatus comprising:

a processor; and

a non-transitory computer-readable storage medium coupled to the processor and storing programming instructions which, when executed by the processor, cause the apparatus to;

send data to a base station by using a contention resource allocated by the base station, wherein the contention resource is a time-frequency resource that is designated when the base station schedules UEs in a contention resource group by using a contention-based grant CB-grant;

after the data is sent, perform blind detection on an uplink grant (UL-grant); and

in response to not detecting the UL-grant through blind detection;

detect whether a positive acknowledgment that is corresponding to the UE and that is fed back by the base station is received; and

in response to detecting that the positive acknowledgment that is corresponding to the UE and that is fed back by the base station is not received, retransmit the data on the resource indicated by the CB-grant delivered by the base station.

6. The apparatus according to claim 5, wherein the programming instructions, when executed by the processor, cause the apparatus to:

extract preset information from the UL-grant, wherein the preset information is configured by the base station as information that can be successfully identified only by one UE;

identify the preset information in a preset manner; and

after the preset information is successfully identified, determine that the UL-grant is successfully found through blind detection.

7. The apparatus according to claim 5, wherein the programming instructions, when executed by the processor, cause the apparatus to:

perform blind detection on a second UL-grant;

in response to detecting the second UL-grant through blind detection, retransmit the data on a non-contention resource indicated by the second UL-grant.

8. The apparatus according to claim 5, wherein the programming instructions, when executed by the processor, cause the apparatus to:

obtain an effective time of a last CB-grant received from the base station;

when a current moment does not exceed the effective time, retransmit the data on the contention resource; and

when a current moment exceeds the effective time, wait for a next CB-grant sent by the base station, and after the next CB-grant is received, retransmit the data on a resource indicated by the next CB-grant.