US-12621852-B2 - Methods and systems for saving power in sidelink communications

Abstract

Methods, apparatus, and systems for saving power among UE in sidelink communications are described herein. The disclosure provides various systems and methods for selecting sidelink resources, and determining whether destination sources are in active time. The disclosure further provides various systems and methods for starting and restarting timers for wireless devices to improve upon communications in sidelink communication systems.

Inventors

• Weiqiang Du

Assignees

• ZTE CORPORATION

Dates

Publication Date

20260505

Application Date

20230713

Claims (20)

1. 1 . An information transmission method comprising: determining whether a destination is in an active time according to a period resource indicated by a Side Link Control Information (SCI) associated with the destination; selecting, by a wireless device, at least one initial transmission resource on which the destination is in the active time; and using, by the wireless device, the selected at least one initial transmission resource for the sidelink communication.
2. 2 . The method according to claim 1 , wherein the period resource further comprises first N period resources indicated by the SCI associated with the destination, wherein the first N period resources are used for the determining.
3. 3 . The method according to claim 1 , wherein the period resource comprises a period resource in a current Discontinuous Reception (DRX) cycle that is indicated by the SCI associated with the destination, the period resource in the current DRX is used for the determining, wherein the period resource indicates at least one slot or subframe associated with the destination.
4. 4 . The method according to claim 1 , wherein the determining is performed for a SCI with a feedback enable, enabling the destination to receive a feedback associated with the SCI, wherein the feedback comprises at least one of Hybrid Automatic Repeat Request (HARQ) feedback, HARQ ACK or NACK or Media Access Control Control Element (MAC CE), RRC signaling, or an indicator indicating that the destination received the SCI successfully.
5. 5 . The method according to claim 1 , wherein the determining is performed for a SCI with a Hybrid Automatic Repeat Request (HARQ) ACK or NACK.
6. 6 . The method according to claim 1 , wherein a Physical Sidelink Shared Channel (PSSCH) transmission is feedback disabled for the wireless device to disregard transmission reliability or disregard whether the destination received a Side Link Control Information (SCI) successfully.
7. 7 . The method according to claim 6 , further comprising: determining whether the destination is in the active time according to a specification configuration when a Media Access Controller (MAC) Protocol Data Unit (PDU)'s feedback is disabled or only NACK, the specification configuration includes whether a specific PC5 QoS Identifier (PQI) or Quality of Service (QoS) or Data Radio Bearers (DRB) or logical channel or Media Access Control Control Element (MAC CE) or destination or User Equipment (UE) or priority or a resource pool is allowed to do so.
8. 8 . The method according to claim 1 , wherein the determining is performed if a Media Access Controller (MAC) Protocol Data Unit (PDU) associated with the SCI only includes data of QoS Identifier (PQI) or Quality of Service (QoS) or Data Radio Bearers (DRB) or logical channel or Media Access Control Control Element (MAC CE) or destination or User Equipment (UE) or priority that is allowed to determine the destination in the active time.
9. 9 . The method according to claim 1 , wherein a resource pool indicates the destination in the active time based on at least one preceding condition when the resource pool is allowed to be used to determine the destination in the active time.
10. 10 . The method according to claim 1 , wherein the determining is performed if a configuration includes a priority threshold, and wherein a logical channel priority within a Media Access Controller (MAC) Protocol Data Unit (PDU) associated with the SCI is higher than the priority threshold.
11. 11 . The method according to claim 1 , wherein selecting the at least one initial transmission resource excludes the resource where any destination is not in active time as indicated by physical layer resources.
12. 12 . The method according to claim 11 , wherein selecting the at least one initial transmission resource is done randomly based on a transmission opportunity from remaining resources.
13. 13 . The method according to claim 1 , wherein selecting the at least one initial transmission resource excludes the resource where any destination is not in the active time of a current discontinuous reception (DRX) cycle as indicated by the physical layer resources.
14. 14 . The method according to claim 1 , further comprising: selecting, by the wireless device, at least one retransmission resource on which the destination is in the active time.
15. 15 . The method according to claim 1 , wherein selecting the at least one initial transmission resource is done according to a discontinuous reception (DRX) configuration of any destination.
16. 16 . The method according to claim 1 , comprising selecting the at least one initial transmission resource where any destination is in active time.
17. 17 . The method according to claim 1 , further comprising ensuring that following period resources spaced by a resource reservation interval is in the active time of any destination.
18. 18 . The method according to claim 1 , further comprising excluding one or more resources on which the destination with a highest priority logical channel is not in active time from the one or more resources indicated by physical layer resources.
19. 19 . The method according to claim 18 , wherein selecting the at least one initial transmission resource is done randomly based on a transmission opportunity from remaining resources.
20. 20 . A wireless device, comprising: at least one processor configured to: determine whether a destination is in an active time according to a period resource indicated by a Side Link Control Information (SCI) associated with the destination; select at least one initial transmission resource on which the destination is in the active time; and use the selected at least one initial transmission resource for the sidelink communication.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the benefit of priority under 35 U.S.C. § 120 as a continuation of PCT Patent Application No. PCT/CN2021/071912, filed on Jan. 14, 2021, the disclosure of which is incorporated herein by reference in its entirety. TECHNICAL FIELD This disclosure is directed generally to wireless communications. BACKGROUND Mobile communication technologies are moving the world toward an increasingly connected and networked society. The rapid growth of mobile communications and advances in technology have led to greater demand for capacity and connectivity. Other aspects, such as energy consumption, device cost, spectral efficiency, and latency are also important to meeting the needs of various communication scenarios. Various techniques, including new ways to provide higher quality of service, longer battery life, and improved performance are being discussed. SUMMARY This patent document describes, among other things, techniques for communicating in an in a sidelink deployment for New Radio (NR). In an aspect, wireless device selects a sidelink communication based on an active time of a destination and uses the selected resource for sidelink communication. In an aspect, the wireless determines whether the destination is in the active time according to: (a) the resource, an initial transmission resource, a retransmission resource, or a period resource indicated by a Side Link Control Information (SCI) associated with the destination; (b) the resource, the initial transmission resource, the retransmission resource, or the period resource indicated by SCI or immediate last SCI associated with the destination; or (c) the resource, the initial transmission resource, the retransmission resource, or the period resource indicated by a prior SCI associated with the destination. In yet another aspect, the period resource further comprises first N period resources indicated by the SCI associated with the destination, wherein the first N period resources are used for determining. In yet another aspect, the period resource comprises a period resource in a current Discontinuous Reception (DRX) cycle that is indicated by the SCI associated with the destination, the period resource in the current DRX is used for the determining. In yet another aspect, the determining step is performed for a SCI with a feedback enable. In yet another aspect, the determining step is performed for a SCI with a Hybrid Automatic Repeat Request (HARQ) ACK or NACK. In yet another aspect, a Physical Sidelink Shared Channel (PSSCH) transmission is feedback disabled. In yet another aspect, the wireless device determines whether the destination is in the active time according to a specification configuration when a Media Access Controller (MAC) Protocol Data Unit (PDU)'s feedback is disabled or only NACK, the specification configuration includes whether a specific PC5 QoS Identifier (PQI) or Quality of Service (QoS) or Data Radio Bearers (DRB) or logical channel or Media Access Controller Control Element (MAC CE) or destination or User Equipment (UE) or priority or the resource pool is allowed to do so. In yet another aspect, determination is performed if the MAC PDU associated with the SCI only includes the data of PQI or QoS or DRB or logical channel or MAC CE or destination or UE or priority that is allowed to determine the destination in active time. In yet another aspect, the resource pool indicates that the destination in active time. In yet another aspect, the wireless device determines if the configuration includes a priority threshold, and wherein the logical channel priority within the MAC PDU associated with the SCI is higher than the threshold. In another aspect, the wireless device selects an initial transmission resource on which the destination is in the active time. In yet another aspect, the selecting the initial resource excludes the resource where any destination is not in active time as indicated by physical layer resources. In yet another aspect, the selecting the initial resource is done randomly based on a transmission opportunity from remaining resources. In yet another aspect, the selecting the initial resource excludes the resource where any destination is not in the active time of a current DRX cycle as indicated by physical layer resources. In yet another aspect, the selecting the initial transmission resource where any destination is in active time. In yet another aspect, the selecting the initial transmission resource is done according to the DRX configuration of any destination. In yet another aspect, the selecting the initial transmission resource where any destination is in active time. In yet another aspect, the wireless device ensures that the following period resources spaced by the resource reservation interval is in the active time of any destination. In yet another aspect, the wireless device excludes the resources on which the destination with the highest priority lo