Scheduling sidelink resources for multiple unicasts by a single downlink control information message

Patent metadata

Field	Value
Publication number	US-2021410179-A1
Application number	US-202117338496-A
Country	US
Kind code	A1
Filing date	Jun 3, 2021
Priority date	Jun 29, 2020
Publication date	Dec 30, 2021
Grant date	—

Abstract

This disclosure provides systems, methods, and apparatuses, including computer programs encoded on computer storage media, for wireless communication. In one aspect of the disclosure, a method of wireless communication performed by a user equipment (UE) includes receiving, from a base station, a grant message indicating a set of sidelink resources. The method further includes transmitting multiple unicast messages via multiple subgroups of the set of sidelink resources.

First claim

What is claimed is:

1 . A method of wireless communication performed by a user equipment (UE), the method comprising:
receiving, from a base station, a grant message indicating a set of sidelink resources; and transmitting multiple unicast messages via multiple subgroups of the set of sidelink resources.

2 . The method of claim 1 , further comprising configuring multiple subgroups of the set of sidelink resources.

3 . The method of claim 1 , wherein transmitting the multiple unicast messages via the multiple subgroups includes transmitting the multiple unicast messages via each subgroup of the multiple subgroups.

4 . The method of claim 1 , further comprising:
determining, based on the grant message, the set of sidelink resources; and splitting the set of sidelink resources into the multiple subgroups.

5 . The method of claim 4 , wherein the set of sidelink resources are split based on a receive (RX) UE buffer status report, channel state information of an RX UE channel, or a combination thereof.

6 . The method of claim 1 , further comprising:
scheduling the multiple unicast messages; and wherein transmitting the multiple unicast messages comprises:
transmitting, to a first receive UE, a first unicast message of the multiple unicast messages via a first subgroup of the subgroups; and
transmitting, to a second receive UE, a second unicast message of the multiple unicast messages via a second subgroup of the subgroups.

7 . The method of claim 6 , further comprising:
receiving a first ACK/NACK message from the first RX UE responsive to the first unicast message; and receiving a second ACK/NACK message from the second RX UE responsive to the second unicast message.

8 . The method of claim 1 , further comprising:
generating a buffer status for each of one or more receive (RX) UEs; and transmitting a sidelink buffer status report (BSR) to the base station to request sidelink resources.

9 . The method of claim 8 , further comprising combining the buffer status of multiple RX UEs to generate the sidelink BSR.

10 . The method of claim 1 , further comprising transmitting a feedback message to the base station.

11 . The method of claim 10 , wherein:
the feedback message is responsive to the grant message; the feedback message is a single feedback message; or a combination thereof.

12 . The method of claim 11 , wherein the feedback message includes an ACK/NACK indicator, wherein the ACK/NACK indicator includes one or more bits.

13 . The method of claim 11 , wherein the feedback message includes an ACK/NACK indicator, wherein the ACK/NACK indicator includes multiple bits, further comprising:
determining an amount of resources to be requested from the base station; and determining a value of the multiple bits based on the amount.

14 . The method of claim 13 , further comprising:
determining a maximum number of subgroups that the set of sidelink resources are splittable into; and receiving an upper layer message; and wherein the maximum number of subgroups is determined based on the RRC message.

15 . A user equipment (UE) comprising:
at least one processor; and a memory coupled with the at least one processor and storing processor-readable code that, when executed by the at least one processor, is configured to:
receive, from a base station, a grant message indicating a set of sidelink resources; and
transmit multiple unicast messages via multiple subgroups of the set of sidelink resources.

16 . The UE of claim 15 , further comprising:
generating a feedback message; and transmitting the feedback message to the base station.

17 . The UE of claim 16 , wherein the feedback message includes a number of ACK/NACK indicators.

18 . The UE of claim 16 , wherein the feedback message includes an ACK/NACK indicator for each subgroup.

19 . The UE of claim 16 , wherein the feedback message includes an ACK/NACK indicator for each subgroup of a maximum number of subgroups.

20 . The UE of claim 16 , wherein the feedback message indicates, for the number of subgroups, a number of ACKs, a number of NACKS, or both.

21 . The UE of claim 16 , wherein the feedback message includes an ACK/NACK indicator, and the ACK/NACK indicator includes multiple bits.

22 . The UE of claim 21 , further comprising:
determining a value of the multiple bits; and determining an amount of resources requested by the UE based on the value.

23 . The UE of claim 15 , further comprising determining, based on a hybrid automatic repeat request (HARQ) process identity (ID) field of the grant message, a HARQ ID of a first subgroup of the set of sidelink resources.

24 . The UE of claim 15 , wherein the grant message indicates a number of one or more subgroups of the set of sidelink resources.

25 . The UE of claim 24 , further comprising:
determining the number of one or more subgroups of the set of sidelink resources, the number of one or more subgroups of the set of sidelink resources is less than or equal to a maximum number of subgroups the set of sidelink resources is splittable into; and receiving a radio resource control (RRC) message that indicates the maximum number of subgroups.

26 . The UE of claim 15 , wherein a new data indicator (NDI) control of the grant message is used for multiple subgroups.

27 . The UE of claim 15 , wherein each subgroup is associated with a new data indicator (NDI) control of the grant message.

28 . The UE of claim 15 , further comprising:
transmitting a feedback message to the base station; and wherein:
the feedback message includes a number of ACK/NACK indicators; or
the feedback message includes an ACK/NACK indicator for each subgroup.

29 . The UE of claim 15 , wherein the grant message is a single grant message or the grant message includes downlink control information (DCI).

30 . The UE of claim 29 , wherein the grant message includes a single DCI.

Assignees

• Qualcomm Inc

Inventors

• Fong Lik Hang Silas
• Sun Jing
• Gupta Piyush
• Zhang Xiaoxia
• Li Junyi
• Wang Xiaojie

Classifications

• H04L5/0044 Primary

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/23 Primary

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

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title

• H04W76/14

  Direct-mode setup · CPC title