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US-12628241-B2 - Terminal device, network node, and methods therein for DRX configuration

US12628241B2US 12628241 B2US12628241 B2US 12628241B2US-12628241-B2

Abstract

The present disclosure provides a method ( 300 ) in a first terminal device. The method ( 300 ) includes: transmitting ( 310 ), to a second terminal device, a first sidelink message containing a first Discontinuous Reception, DRX, configuration; receiving ( 320 ), from the second terminal device, a second sidelink message containing a second DRX configuration; and delaying ( 330 ) transmission of a second response to the second sidelink message to the second terminal device until a first response to the first sidelink message is received from the second terminal device, or until a timer expires.

Inventors

  • Min Wang
  • Antonino ORSINO
  • Zhang Zhang

Assignees

  • TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

Dates

Publication Date
20260512
Application Date
20220222
Priority Date
20210226

Claims (20)

  1. 1 . A method in a first terminal device, comprising: transmitting, to a second terminal device, a first sidelink message containing a first Discontinuous Reception (DRX) configuration; receiving, from the second terminal device, a second sidelink message containing a second DRX configuration; and delaying transmission of a second response to the second sidelink message to the second terminal device until a first response to the first sidelink message is received from the second terminal device, or until a timer expires.
  2. 2 . The method of claim 1 , wherein the first response contains a suggested change to the first DRX configuration, and the method further comprises: updating the first DRX configuration based on the suggested change to the first DRX configuration.
  3. 3 . The method of claim 2 , wherein the updated first DRX configuration and the second DRX configuration contain respective on-duration timers and/or inactivity timers that are configured separately, and one or more DRX parameters that are configured to be common to the updated first DRX configuration and the second DRX configuration.
  4. 4 . The method of claim 3 , wherein the one or more DRX parameters comprise a slot offset, a retransmission timer, a long cycle start offset, a short cycle, a short cycle timer, and/or a Hybrid Automatic Repeat reQuest Round-Trip Time timer.
  5. 5 . The method of claim 2 , further comprising: transmitting the second response to the second terminal device, the second response containing a suggested change to the second DRX configuration.
  6. 6 . The method of claim 5 , wherein the suggested change to the second DRX configuration is determined based on the updated first DRX configuration.
  7. 7 . The method of claim 1 , wherein the timer is set to a different value from a corresponding timer provided at the second terminal device.
  8. 8 . The method of claim 1 , wherein each of the first DRX configuration and the second DRX configuration is for a bidirectional link between the first terminal device and the second terminal device, or the first DRX configuration is for a unidirectional link from the first terminal device to the second terminal device, and the second DRX configuration is for a unidirectional link from the second terminal device to the first terminal device.
  9. 9 . The method of claim 1 , wherein the first sidelink message is for sidelink unicast establishment or Sidelink Radio Bearer (SLRB) setup for a unidirectional link from the first terminal device to the second terminal device, and the second sidelink message is for sidelink unicast establishment or SLRB setup for a unidirectional link from the second terminal device to the first terminal device.
  10. 10 . The method of claim 1 , wherein the first sidelink message and the second sidelink message are associated with a same type of service or with different types of services.
  11. 11 . The method of claim 1 , further comprising: receiving, from a network node or another terminal device controlling the first terminal device and/or the second terminal device, a configuration for the delaying.
  12. 12 . The method of claim 11 , wherein the network node is a next generation Node B, a Session Management Function node, or a Policy Control Function node.
  13. 13 . The method of claim 12 , wherein the configuration is received from the gNB via: Radio Resource Control (RRC) signaling, Medium Access Control (MAC) Control Element (CE), or Layer 1 (L1) signaling; the configuration is received from the SMF node or the PCF node via: Non-Access Stratum (NAS) RRC signaling; or the configuration is received from the other terminal device via: PC5-RRC signaling, PC5-Signaling, discovery signaling, MAC CE, or L1 signaling.
  14. 14 . A first terminal device, comprising a transceiver, a processor and a memory, the memory comprising instructions executable by the processor wherein the first terminal device is operative to: transmit, to a second terminal device, a first sidelink message containing a first Discontinuous Reception (DRX) configuration; receive, from the second terminal device, a second sidelink message containing a second DRX configuration; and delay transmission of a second response to the second sidelink message to the second terminal device until a first response to the first sidelink message is received from the second terminal device, or until a timer expires.
  15. 15 . A method in a first terminal device, comprising: transmitting, to a second terminal device, a first sidelink message for sidelink unicast establishment or Sidelink Radio Bearer (SLRB) setup for a unidirectional link from the first terminal device to the second terminal device; receiving, from the second terminal device, a second sidelink message for sidelink unicast establishment or SLRB setup for a unidirectional link from the second terminal device to the first terminal device; and determining which of the first sidelink message and the second sidelink message is to be prioritized.
  16. 16 . The method of claim 15 , wherein the first sidelink message contains a first timestamp and the second sidelink message contains a second timestamp, and wherein said determining comprises determining to prioritize the first sidelink message when the first timestamp is earlier than the second timestamp, or to prioritize the second sidelink message when the second timestamp is earlier than the first timestamp.
  17. 17 . The method of claim 15 , wherein said determining comprises determining to prioritize the first sidelink message or the second sidelink message based on a first weight or priority associated with the first terminal device and a second weight or priority associated with the second terminal device.
  18. 18 . The method of claim 17 , wherein the first weight or priority is a first fixed value configured for the first terminal device, and the second weight or priority is a second fixed value configured for the second terminal device.
  19. 19 . The method of claim 18 , wherein the first fixed value is a User Equipment, UE, ID of the first terminal device, and the second fixed value is a UE ID of the second terminal device.
  20. 20 . The method of claim 17 , wherein the first weight or priority or the second weight or priority is dependent on one or more of the following associated with the first or second terminal device: a User Equipment (UE) category, a UE capability, a battery life, a type of a current service, a priority of the current service, a Quality of Service (QoS) requirement for the current service, or a geographical location.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a 35 U.S.C. § 371 National Stage of International Patent Application No. PCT/CN2022/077259, filed 2022 Feb. 22, which claims priority to International Patent Application No. PCT/CN2021/078250, filed on 2021 Feb. 26, which is incorporated by this reference. TECHNICAL FIELD The present disclosure relates to communication technology, and more particularly, to a terminal device, a network node, and methods therein for Discontinuous Reception (DRX) configuration. BACKGROUND Sidelink (SL) transmissions over New Radio (NR) are specified in the 3rd Generation Partnership Project (3GPP) in Release 16, including enhancements of Proximity-based Services (ProSe) specified for Long Term Evolution (LTE). Four new enhancements are particularly introduced to NR sidelink transmissions as follows: Support for unicast and groupcast transmissions is added in NR sidelink. For unicast and groupcast, a Physical Sidelink Feedback Channel (PSFCH) is introduced for a receiver User Equipment (UE) to reply a decoding status to a transmitter UE.Grant-free transmissions, which are adopted in NR uplink transmissions, are also provided in NR sidelink transmissions, to improve the latency performance.To alleviate resource collisions among different sidelink transmissions launched by different UEs, it enhances channel sensing and resource selection procedures, which also leads to a new design of Physical Sidelink Common Control Channel (PSCCH).To achieve a high connection density, congestion control and thus Quality of Service (QoS) management are supported in NR sidelink transmissions. To enable the above enhancements, new physical channels and reference signals are introduced in NR: Physical Sidelink Shared Channel (PSSCH), a sidelink version of Physical Downlink Shared Channel (PDSCH): The PSSCH is transmitted by a sidelink transmitter UE, and conveys sidelink transmission data, System Information Blocks (SIBs) for Radio Resource Control (RRC) configuration, and a part of Sidelink Control Information (SCI), a sidelink version of Downlink Control Information (DCI).PSFCH, a sidelink version of Physical Uplink Control Channel (PUCCH): The PSFCH is transmitted by a sidelink receiver UE for unicast and groupcast, and conveys 1 bit information over 1 Resource Block (RB) for a Hybrid Automatic Repeat reQeust (HARQ) acknowledgement (ACK) or a negative ACK (NACK). In addition, Channel State Information (CSI) is carried in a Medium Access Control (MAC) Control Element (CE) over the PSSCH instead of the PSFCH.PSCCH, a sidelink version of Physical Downlink Control Channel (PDCCH): When traffic to be sent to a receiver UE arrives at a transmitter UE, the transmitter UE should first send the PSCCH, which conveys a part of SCI to be decoded by any UE for the channel sensing purpose, including reserved time-frequency resources for transmissions, DeModulation Reference Signal (DMRS) pattern, and antenna port, etc.Sidelink Primary/Secondary Synchronization Signal (S-PSS/S-SSS): Similar to downlink transmissions in NR, in sidelink transmissions, S-PSS and S-SSS are supported. Through detecting the S-PSS and S-SSS, a UE is able to identify a Sidelink Synchronization Identity (SSID) from the UE sending the S-PSS/S-SSS. The UE is therefore able to know the characteristics of the transmitter UE from the S-PSS/S-SSS. A series of processes of acquiring timing and frequency synchronization together with SSIDs of UEs is called initial cell search. Note that the UE sending the S-PSS/S-SSS may not be necessarily involved in sidelink transmissions, and a node (e.g., UE, evolved NodeB (eNB), or (next) generation NodeB (gNB)) sending the S-PSS/S-SSS is called a synchronization source. There are 2 S-PSS sequences and 336 S-SSS sequences forming a total of 672 SSIDs in a cell.Physical Sidelink Broadcast Channel (PSBCH): The PSBCH is transmitted along with the S-PSS/S-SSS as a Synchronization Signal/PSBCH Block (SSB). The SSB has the same numerology as PSCCH/PSSCH on the carrier, and an SSB should be transmitted within the bandwidth of the configured BWP. The PSBCH conveys information related to synchronization, such as the Direct Frame Number (DFN), an indication of the slot and symbol level time resources for sidelink transmissions, an in-coverage indicator, etc. The SSB is transmitted periodically at every 160 ms.DMRS, Phase Tracking Reference Signal (PT-RS), Channel State Information Reference Signal (CSI-RS): These physical reference signals supported by NR downlink/uplink transmissions are also adopted by sidelink transmissions. Similarly, the PT-RS is only applicable for Frequency Range 2 (FR2) transmission. Another new feature is the two-stage SCI. Unlike the DCI, only part (first stage) of the SCI is sent on the PSCCH. This part is used for channel sensing purposes (including reserved time-frequency resources for transmissions, DMRS pattern, and antenna port, etc.) and can be read by all UEs, while the r