IP Library › Granted Patent US 12701629

Granted Patent B2

US 12701629 · App. 17/995,916 · Granted Aug 4, 2026

Discontinuous reception for sidelink communications in wireless communications systems

Inventors: Peng Cheng (Beijing, CN); Karthika Paladugu (San Diego, CA); Wanshi Chen (San Diego, CA); Hong Cheng (Basking Ridge, NJ); Gavin Bernard Horn (La Jolla, CA); Seyedkianoush Hosseini (San Diego, CA); Dan Vassilovski (Del Mar, CA)

Assignee: Qualcomm Incorporated

H04W76/28 H04W8/005

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Quick Facts

Patent No.: US 12701629
App. No.: 17/995,916
Granted: Aug 4, 2026
Kind: B2

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Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit sidelink discontinuous reception (DRX) information to a base station while operating in a connected mode. In some examples, the UE may include the sidelink DRX information in UE-assistance information (UAI). The sidelink DRX information may include a preference of a DRX cycle, a DRX active duration, a DRX inactive duration, and the like, for sidelink DRX operation. The UE may receive a message including a sidelink DRX configuration from the base station based on the sidelink DRX information and operate according to the sidelink DRX configuration.

Claims (141)

1 . An apparatus for wireless communication at a first user equipment (UE), comprising:

one or more memories; and

one or more processors coupled with the one or more memories and configured to cause the first UE to:

transmit sidelink discontinuous reception information to a network entity;

receive, from the network entity, an indication of a resource pool that includes a set of time and frequency resources to use to communicate one or more discovery messages to discover a second UE;

receive, from the network entity, a message that includes a sidelink discontinuous reception configuration, the sidelink discontinuous reception configuration used to communicate the one or more discovery messages during a discontinuous reception cycle of the first UE; and

communicate in accordance with the sidelink discontinuous reception configuration.

2 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the first UE to:

transmit a first discovery message during an active duration of the discontinuous reception cycle based at least in part on the sidelink discontinuous reception configuration;

monitor a sidelink channel to receive a second discovery message from the second UE during the active duration of the discontinuous reception cycle; and

receive the second discovery message from the second UE.

3 . The apparatus of claim 2 , wherein the sidelink discontinuous reception configuration is based at least in part on the resource pool associated with the sidelink channel to receive the second discovery message from the second UE.

4 . The apparatus of claim 2 , wherein the one or more processors are further configured to cause the first UE to:

select the second UE for relay communications between the first UE and the network entity based at least in part on the second discovery message,

wherein the relay communications correspond to one of a layer 2 (L 2 ) function or a layer 3 (L 3 ) function.

5 . The apparatus of claim 2 , wherein the one or more processors are further configured to cause the first UE to:

determine, based at least in part on the sidelink discontinuous reception configuration, a sidelink discontinuous reception pattern to monitor the sidelink channel to receive the second discovery message from the second UE.

6 . The apparatus of claim 1 , wherein, to receive the message, the one or more processors are configured to cause the first UE to:

receive system information that includes the sidelink discontinuous reception configuration from the network entity.

7 . The apparatus of claim 1 , wherein, to receive the message, the one or more processors are configured to cause the first UE to:

receive a radio resource control reconfiguration message that includes the sidelink discontinuous reception configuration from the network entity, wherein the one or more processors are further configured to cause the first UE to:

transmit a radio resource control reconfiguration complete message to the network entity based at least in part on the radio resource control reconfiguration message.

8 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the first UE to:

transmit assistance information that includes the sidelink discontinuous reception information to the network entity.

9 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the first UE to:

determine one or more of the discontinuous reception cycle, an activity timer associated with the discontinuous reception cycle, an inactivity timer associated with the discontinuous reception cycle, or an offset associated with the discontinuous reception cycle based at least in part on a relay service associated with the first UE or a quality-of-service associated with data traffic for the first UE, or both, wherein the sidelink discontinuous reception information indicates one or more of the discontinuous reception cycle, the activity timer associated with the discontinuous reception cycle, the inactivity timer associated with the discontinuous reception cycle, or the offset associated with the discontinuous reception cycle.

10 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the first UE to:

determine a sidelink discontinuous reception pattern to monitor a sidelink channel to receive the one or more discovery messages; and

determine a discontinuous reception pattern to receive a downlink signal from the network entity or to transmit an uplink signal to the network entity, or both, wherein the sidelink discontinuous reception pattern is different from the discontinuous reception pattern, and wherein the sidelink discontinuous reception configuration comprises a first indication of the sidelink discontinuous reception pattern or a second indication of the discontinuous reception pattern, or both.

11 . The apparatus of claim 1 , wherein the first UE comprises a remote UE and the second UE comprises a relay UE between the remote UE and the network entity.

12 . The apparatus of claim 1 , wherein, to receive the message, the one or more processors are configured to cause the first UE to:

receive, from the network entity, a first radio resource control (RRC) reconfiguration message that includes the sidelink discontinuous reception configuration, the sidelink discontinuous reception configuration comprising a first discontinuous reception pattern for relay discovery monitoring.

13 . The apparatus of claim 12 , wherein the one or more processors are further configured to cause the first UE to:

receive, from the network entity, a second RRC reconfiguration message comprising a second discontinuous reception pattern for reception over a Uu interface.

14 . An apparatus for wireless communication at a user equipment (UE), comprising:

one or more memories; and

one or more processors coupled with the one or more memories and configured to cause the UE to:

receive, during operation in a connected mode, an out-of-coverage mode, an idle mode, or an inactive mode, a message that includes a group-common sidelink discontinuous reception configuration to be used by a group of UEs; and

monitor a sidelink channel during a temporal period, the temporal period indicated by the group-common sidelink discontinuous reception configuration.

15 . The apparatus of claim 14 , wherein, to receive the message, the one or more processors are configured to cause the UE to:

receive system information, a radio resource control reconfiguration message, or both, that include the group-common sidelink discontinuous reception configuration.

16 . The apparatus of claim 15 , wherein the one or more processors are further configured to cause the UE to:

enable discontinuous monitoring of the sidelink channel based at least in part on the system information, the radio resource control reconfiguration message, or both.

17 . The apparatus of claim 15 , wherein the one or more processors are further configured to cause the UE to:

disable a discontinuous reception mode based at least in part on a quality-of-service associated with data traffic and a quality-of-service threshold.

18 . The apparatus of claim 14 , wherein the group-common sidelink discontinuous reception configuration comprises a discontinuous reception periodicity common to the group of UEs.

19 . The apparatus of claim 14 , wherein:

the group-common sidelink discontinuous reception configuration comprises an active duration of a discontinuous reception cycle common to the group of UEs, or a group-common offset duration between a start of the discontinuous reception cycle and the active duration of the discontinuous reception cycle, or both; and

the group-common offset duration is common to the group of UEs.

20 . The apparatus of claim 14 , wherein the temporal period is common to the group of UEs.

21 . The apparatus of claim 14 , wherein the one or more processors are further configured to cause the UE to:

determine an offset duration associated with an active duration of a discontinuous reception cycle based at least in part on the group-common sidelink discontinuous reception configuration, wherein, to monitor the sidelink channel, the one or more processors are further configured to cause the UE to:

monitor the sidelink channel during the active duration of the discontinuous reception cycle based at least in part on the offset duration,

wherein the offset duration is based at least in part on a layer 2 (L 2 ) identifier associated with the UE.

22 . The apparatus of claim 14 , wherein the one or more processors are further configured to cause the UE to:

enable a discontinuous reception mode based at least in part on one or more of the message, a quality-of-service associated with data traffic and a quality-of-service threshold, or a power level of the UE and a power level threshold.

23 . The apparatus of claim 14 , wherein the one or more processors are further configured to cause the UE to:

refrain to monitor one or more resource pools during the inactive mode mode of a discontinuous reception cycle based at least in part on the group-common sidelink discontinuous reception configuration.

24 . An apparatus for wireless communication at a first user equipment (UE), comprising:

one or more memories; and

one or more processors coupled with the one or more memories and configured to cause the first UE to:

communicate a first discovery message with a second UE during an active duration of a discontinuous reception cycle, wherein the first discovery message is for identification of an available relay UE, and wherein the discontinuous reception cycle is based at least in part on a sidelink discontinuous reception configuration; and

communicate a second discovery message with the second UE during the active duration of the discontinuous reception cycle.

25 . The apparatus of claim 24 , wherein the sidelink discontinuous reception configuration is based at least in part on a resource pool used to perform discovery operations, the first discovery message or the second discovery message, or both.

26 . The apparatus of claim 24 , wherein the sidelink discontinuous reception configuration comprises a group sidelink discontinuous reception configuration.

27 . An apparatus for wireless communication at a network entity, comprising:

one or more memories; and

one or more processors coupled with the one or more memories and configured to cause the network entity to:

obtain sidelink discontinuous reception information from a user equipment (UE); and

output a message comprising a sidelink discontinuous reception configuration that includes an indication of a sidelink discontinuous reception pattern for the UE, the sidelink discontinuous reception pattern for the UE comprising a set of active durations of a discontinuous reception cycle of the UE and a set of inactive durations of the discontinuous reception cycle indicated by the sidelink discontinuous reception information.

28 . The apparatus of claim 27 , wherein, to transmit the message, the one or more processors are configured to cause the network entity to:

output, to the UE, a radio resource control reconfiguration message, that includes the sidelink discontinuous reception configuration; and

obtain a radio resource control reconfiguration complete message based at least in part on the radio resource control reconfiguration message.

29 . The apparatus of claim 27 , wherein the one or more processors are further configured to cause the network entity to:

obtain assistance information that includes the sidelink discontinuous reception information from the UE.

30 . The apparatus of claim 27 , wherein the one or more processors are further configured to cause the network entity to:

determine the sidelink discontinuous reception pattern for the UE based at least in part on a resource pool configuration for the UE.

31 . The apparatus of claim 27 , wherein the one or more processors are further configured to cause the network entity to:

determine a first sidelink discontinuous reception pattern for a sidelink channel for a discovery message; and

determine a second sidelink discontinuous reception pattern to transmit a downlink signal, wherein the first sidelink discontinuous reception pattern is different from the second sidelink discontinuous reception pattern.

32 . The apparatus of claim 27 , wherein, to output the message, the one or more processors are configured to cause the network entity to:

output a group sidelink discontinuous reception configuration associated with a group of UEs, wherein the message comprises system information, a radio resource control reconfiguration message, or both.

33 . The apparatus of claim 32 , wherein the group sidelink discontinuous reception configuration comprises a discontinuous reception periodicity common to the group of UEs.

34 . The apparatus of claim 27 , wherein, to output the message, the one or more processors are configured to cause the network entity to:

output, to the UE, a first radio resource control (RRC) reconfiguration message that includes the sidelink discontinuous reception configuration, wherein the sidelink discontinuous reception configuration includes an indication of a first discontinuous reception pattern for relay discovery monitoring for the UE.

35 . The apparatus of claim 34 , wherein the one or more processors are further configured to cause the network entity to:

output a second RRC reconfiguration message comprising a second discontinuous reception pattern for reception over a Uu interface.

36 . A method for wireless communication at a first user equipment (UE), comprising:

transmitting sidelink discontinuous reception information to a network entity;

receiving, from the network entity, an indication of a resource pool including a set of time and frequency resources to use to communicate one or more discovery messages to discover a second UE;

receiving, from the network entity, a message including a sidelink discontinuous reception configuration, the sidelink discontinuous reception configuration used to communicate the one or more discovery messages during a discontinuous reception cycle of the first UE; and

communicating in accordance with the sidelink discontinuous reception configuration.

37 . The method of claim 36 , further comprising:

transmitting a first discovery message during an active duration of the discontinuous reception cycle based at least in part on the sidelink discontinuous reception configuration;

monitoring a sidelink channel to receive a second discovery message from the second UE during the active duration of the discontinuous reception cycle; and

receiving the second discovery message from the second UE.

38 . The method of claim 36 , wherein receiving the message comprises:

receiving a radio resource control reconfiguration message including the sidelink discontinuous reception configuration from the network entity, wherein the method further comprises:

transmitting a radio resource control reconfiguration complete message to the network entity based at least in part on the radio resource control reconfiguration message.

39 . The method of claim 36 , wherein receiving the message comprises:

receiving, from the network entity, a first radio resource control (RRC) reconfiguration message that includes the sidelink discontinuous reception configuration, the sidelink discontinuous reception configuration comprising a first discontinuous reception pattern for relay discovery monitoring.

40 . The method of claim 39 , further comprising:

receiving, from the network entity, a second RRC reconfiguration message comprising a second discontinuous reception pattern for reception over a Uu interface.

41 . A method for wireless communication at a user equipment (UE), comprising:

receiving, during operation in a connected mode, an out-of-coverage mode, an idle mode, or an inactive mode, a message including a group-common sidelink discontinuous reception configuration to be used by a group of UEs; and

monitoring a sidelink channel during a temporal period, the temporal period indicated by the group-common sidelink discontinuous reception configuration.

42 . The method of claim 41 , wherein receiving the message comprises:

receiving system information, a radio resource control reconfiguration message, or both, including the group-common sidelink discontinuous reception configuration.

43 . The method of claim 41 , wherein:

the group-common offset duration is common to the group of UEs.

44 . A method for wireless communication at a first user equipment (UE), comprising:

communicating a first discovery message with a second UE during an active duration of a discontinuous reception cycle, wherein the first discovery message is for identification of an available relay UE, and wherein the discontinuous reception cycle is based at least in part on a sidelink discontinuous reception configuration; and

communicating a second discovery message with the second UE during the active duration of the discontinuous reception cycle.

45 . The method of claim 44 , wherein the sidelink discontinuous reception configuration is based at least in part on a resource pool to use to perform discovery operations, the first discovery message or the second discovery message, or both.

46 . A method for wireless communication at a network entity, comprising:

obtaining sidelink discontinuous reception information from a user equipment (UE); and

outputting a message comprising a sidelink discontinuous reception configuration including an indication of a sidelink discontinuous reception pattern for the UE, the sidelink discontinuous reception pattern for the UE comprising a set of active durations of a discontinuous reception cycle of the UE and a set of inactive durations of the discontinuous reception cycle indicated by the sidelink discontinuous reception information.

47 . The method of claim 46 , wherein outputting the message comprises:

outputting a radio resource control reconfiguration message, including the sidelink discontinuous reception configuration to the UE; and

obtaining a radio resource control reconfiguration complete message based at least in part on the radio resource control reconfiguration message.

48 . The method of claim 46 , wherein outputting the message comprises:

outputting a group sidelink discontinuous reception configuration associated with a group of UEs, wherein the message comprises system information or a radio resource control reconfiguration message.

49 . The method of claim 46 , wherein outputting the message comprises:

outputting, to the UE, a first radio resource control (RRC) reconfiguration message that includes the sidelink discontinuous reception configuration, wherein the sidelink discontinuous reception configuration includes an indication of a first discontinuous reception pattern for relay discovery monitoring for the UE.

50 . The method of claim 49 , further comprising:

outputting a second RRC reconfiguration message comprising a second discontinuous reception pattern for reception over a Uu interface.

51 . A non-transitory computer-readable medium storing code for wireless communication at a first user equipment (UE), the code comprising instructions executable by one or more processors to cause the first UE to:

transmit sidelink discontinuous reception information to a network entity;

receive, from the network entity, an indication of a resource pool that includes a set of time and frequency resources to use to communicate one or more discovery messages to discover a second UE;

communicate in accordance with the sidelink discontinuous reception configuration.

52 . A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by one or more processors to cause the UE to:

monitor a sidelink channel during a temporal period, the temporal period indicated by the group-common sidelink discontinuous reception configuration.

53 . A non-transitory computer-readable medium storing code for wireless communication at a first user equipment (UE), the code comprising instructions executable by one or more processors to cause the first UE to:

communicate a second discovery message with the second UE during the active duration of the discontinuous reception cycle.

54 . A non-transitory computer-readable medium storing code for wireless communication at a network entity, the code comprising instructions executable by one or more processors to cause the network entity to:

obtain sidelink discontinuous reception information from a user equipment (UE); and