Methods, devices and systems for device to device (D2D) data transmission and retransmission

Patent metadata

Field	Value
Publication number	US-11096200-B2
Application number	US-201916537316-A
Country	US
Kind code	B2
Filing date	Aug 9, 2019
Priority date	Feb 10, 2017
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

Embodiments of this application disclose a data transmission method that includes sending, by a base station, first scheduling information to first UE. The first scheduling information instructs the first UE to send data to second UE based on the first scheduling information. The method includes receiving, by the base station, first feedback information sent by the first UE. The method includes sending, by the base station, second scheduling information to the first UE if the first feedback information indicates that the second UE fails to receive the data. Embodiments of this application further provide a base station, UE, and a data transmission system. In embodiments of this application, the first UE may perceive a data receiving status of the second UE by receiving the first feedback information, so that a corresponding resource can be assigned again for data retransmission.

First claim

What is claimed is:

1. A method, comprising:
sending, by a network device to a first terminal device, first scheduling information indicating a plurality of sidelink (SL) resources for a plurality of SL transmissions, the plurality of SL resources including a first SL resource, wherein the first scheduling information instructs the first terminal device to send data in a first SL transmission of the plurality of SL transmissions to a second terminal device using the first SL resource and retransmit the data in the rest of the plurality of SL transmissions using the rest of the plurality of SL resources based on the first scheduling information, and wherein the first scheduling information includes indication information indicating that the data can be retransmitted;
receiving, by the network device from the first terminal device, first feedback information, wherein the first feedback information indicates whether the second terminal device successfully receives the data in the first SL transmission, wherein the network device receives the first feedback information after a last SL transmission of the plurality of SL transmissions; and
sending, by the network device to the first terminal device based on the first feedback information indicating that the second terminal device fails to receive the data, second scheduling information indicating a second plurality of SL resources for a second plurality of SL transmissions, the second plurality of SL resources including a second resource, wherein the second scheduling information instructs the first terminal device to resend the data to the second terminal device using the second resource.

2. The method according to claim 1 , wherein:
the first feedback information is determined based on second feedback information, and
the second feedback information is sent from the second terminal device to the first terminal device.

3. The method according to claim 2 ,
wherein the second feedback information is an acknowledgement (ACK), the first feedback information is the ACK, or
wherein the second feedback information is a negative acknowledgement (NACK), the first feedback information is the NACK, or
wherein the first terminal device fails to receive the second feedback information, the first feedback information is a NACK.

4. The method according to claim 1 , wherein:
the second scheduling information comprises downlink feedback information, and
the sending, by the network device, the second scheduling information to the first terminal device comprises:
sending, by the network device, the downlink feedback information to the first terminal device, wherein the downlink feedback information instructs the first terminal device to resend the data to the second terminal device based on the first scheduling information.

5. The method according to claim 1 , wherein the sending the first scheduling information to the first terminal device comprises:
sending, by the network device to the first terminal device, the first scheduling information that is processed using a scrambling identifier, wherein the scrambling identifier indicates that the data can be retransmitted.

6. The method of claim 1 , wherein the first scheduling information further indicates a feedback resource for the first terminal device to send the first feedback information.

7. A method, comprising:
receiving, by a first terminal device from a network device, first scheduling information indicating a plurality of sidelink (SL) resources for a plurality of SL transmissions, the plurality of SL resources including a first SL resource, wherein the first scheduling information instructs the first terminal device to send data in a first SL transmission of the plurality of SL transmissions to a second terminal device using the first SL resource and retransmit the data in the rest of the plurality of SL transmissions using the rest of the plurality of SL resources based on the first scheduling information, and wherein the first scheduling information includes indication information indicating that the data can be retransmitted;
sending, by the first terminal device to the network device, first feedback information, wherein the first feedback information indicates whether the second terminal device successfully receives the data in the first SL transmission, wherein the first terminal device sends the first feedback information after a last SL transmission of the plurality of SL transmissions; and
receiving, by the first terminal device from the network device based on the first feedback information indicating that the second terminal device fails to receive the data, second scheduling information indicating a second plurality of SL resources for a second plurality of SL transmissions, the second plurality of SL resources including a second resource, wherein the second scheduling information instructs the first terminal device to resend the data to the second terminal device using the second resource.

8. The method according to claim 7 , wherein the method further comprises:
receiving, by the first terminal device, second feedback information from the second terminal device, wherein the second feedback information indicates whether the second terminal device successfully receives the data; and
determining, by the first terminal device, the first feedback information based on the second feedback information.

9. The method according to claim 8 ,
wherein the second feedback information is an acknowledgement (ACK), the first feedback information is the ACK, or
wherein the second feedback information is a negative acknowledgement (NACK), the first feedback information is the NACK, or
wherein the first terminal device fails to receive the second feedback information, the first feedback information is a NACK.

10. The method according to claim 7 , wherein:
the second scheduling information comprises downlink feedback information, and
receiving, by the first terminal device, the second scheduling information sent by the network device comprises receiving, by the first terminal device, the downlink feedback information sent by the network device, wherein the downlink feedback information instructs the first terminal device to resend the data to the second terminal device based on the first scheduling information.

11. The method according to claim 10 , wherein after the receiving, by the first terminal device, the downlink feedback information sent by the network device, the method further comprises:
determining, by the first terminal device, the first scheduling information based on the downlink feedback information, wherein the first scheduling information instructs the first terminal device to resend the data to the second terminal device before the receiving the second scheduling information.

12. A network device, comprising:
a non-transitory memory storage comprising instructions; and
a processor configured to communicate with the non-transitory memory storage, the processor configured to execute the instructions to:
send, to a first terminal device, first scheduling information indicating a plurality of sidelink (SL) resources for a plurality of SL transmissions, the plurality of SL resources including a first SL resource, wherein the first scheduling information instructs the first terminal device to send data in a first SL transmission of the plurality of SL transmissions to a second terminal device using the first SL resource and retransmit the data in the rest of the plurality of SL transmissions using the rest of the plurality of SL resources based on the first scheduling information, and wherein the first scheduling information includes indication information ind

Assignees

• Huawei Tech Co Ltd

Inventors

• Lu Zhenwei
• Liu Deping

Classifications

• H04W72/23 Primary

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

• H04W72/25

  between terminals via a wireless link, e.g. sidelink · CPC title

• H04L1/1887 Primary

  Scheduling and prioritising arrangements · CPC title

• H04L1/1896

  ARQ related signaling · CPC title

• H04L5/0055

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