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EP-4740685-A1 - SIDELINK CARRIER AGGREGATION FOR WIRELESS COMMUNICATION NETWORKS

EP4740685A1EP 4740685 A1EP4740685 A1EP 4740685A1EP-4740685-A1

Abstract

Systems, methods, processors, and circuitries are provided for configuring sidelink (SL) communications for carrier aggregation (CA). In some aspects, a baseband processor is configured to perform operations including receiving, at a user equipment (UE) from a peer UE, an indication whether the peer UE supports SL CA; and generating, for the peer UE, based on the peer UE supporting SL CA, an SL reconfiguration message configuring an SL data radio bearer (SL-DRB) to carry data from the UE to the peer UE.

Inventors

  • CHENG, PENG
  • WU, ZHIBIN
  • HU, HAIJING
  • YE, CHUNXUAN

Assignees

  • Apple Inc.

Dates

Publication Date
20260513
Application Date
20240802

Claims (20)

  1. 1. A baseband processor configured to perform operations comprising: receiving, at a user equipment (UE) from a peer UE, an indication whether the peer UE supports sidelink (SL) carrier aggregation (CA); and generating, for the peer UE, based on the peer UE supporting SL CA, an SL reconfiguration message configuring an SL data radio bearer (SL-DRB) to carry data from the UE to the peer UE.
  2. 2. The baseband processor of claim 1, wherein the operations further comprise: generating, for the peer UE, a first message enquiring at least one capability of the peer UE, wherein the indication whether the peer UE supports SL CA is included in a second message from the peer UE in response to the first message.
  3. 3. The baseband processor of claim 2, wherein at least one of the first message, the second message, or the SL reconfiguration message comprises a PC5-Radio Resource Control (PC5- RRC) message.
  4. 4. The baseband processor of claim 2, wherein at least one of the first message, the second message, or the SL reconfiguration message is transmitted over an SL signal radio bearer (SRB) 3 (SL-SRB3).
  5. 5. The baseband processor of claim 1, wherein the SL reconfiguration message configures the SL-DRB for packet duplication or for SL CA.
  6. 6. The baseband processor of claim 1 , wherein the SL reconfiguration message configures the SL-DRB with a first plurality of SL component carriers to carry the data from the UE to the peer UE.
  7. 7. The baseband processor of claim 6, wherein the operations further comprise: causing radio link monitoring (RLM) of at least one of the first plurality of SL component carriers, wherein the RLM is based on at least one of: a number of retransmissions to the peer UE at a radio link control (RLC) layer associated with each of the at least one of the first plurality of SL component carriers; or a number of consecutive hybrid automatic repeat request (HARQ) discontinuous transmission (DTX) events associated with each of the at least one of the first plurality of SL component carriers.
  8. 8. The baseband processor of claim 6, wherein the operations further comprise: causing independent radio link monitoring (RLM) of each of the first plurality of SL component carriers; and declaring, based on the RLM detecting a failure of a first SL component carrier of the first plurality of SL component carriers, a radio link failure (RLF) of the first SL component carrier.
  9. 9. The baseband processor of claim 6, wherein: the SL reconfiguration message further configures an SL signal radio bearer 3 (SL- SRB3) for packet duplication with a second plurality of SL component carriers; and the operations further comprise: causing independent radio link monitoring (RLM) of each of the first plurality of SL component carriers and each of the second plurality of SL component carriers; and declaring, based on the RLM detecting a failure of a first SL component carrier of the first plurality of SL component carriers or the second plurality of SL component carriers, an RLF of the first SL component carrier.
  10. 10. The baseband processor of claim 6, wherein: the SL reconfiguration message further configures an SL signal radio bearer 3 (SL- SRB3) for packet duplication with a second plurality of SL component carriers; and the operations further comprise: causing independent radio link monitoring (RLM) of each of the second plurality of SL component carriers; and declaring, based on the RLM detecting a failure of a first SL component carrier of the second plurality of SL component carriers, an RLF of the first SL component carrier.
  11. 11. The baseband processor of claim 10, wherein the operations further comprise: determining whether the RLM detected a failure of all of the second plurality of SL component carriers; and reconfiguring, based on a determination that the RLM detected a failure of all of the second plurality of SL component carriers, one or more of the second plurality of SL component carriers.
  12. 12. The baseband processor of claim 1 1, wherein the operations further comprise: determining whether the RLM detected a failure of a second SL component carrier of the first plurality of SL component carriers; and reconfiguring, based on a determination that the RLM detected a failure of a second SL component carrier of the first plurality of SL component carriers, one or more of the first plurality of SL component carriers.
  13. 13. The baseband processor of claim 11, wherein the operations further comprise: receiving, from the peer UE, reception reporting regarding the first plurality of SL component carriers; and reconfiguring, based on the reception reporting, one or more of the first plurality of SL component carriers.
  14. 14. The baseband processor of claim 6, wherein: the SL reconfiguration message further configures an SL signal radio bearer 3 (SL- SRB3) for packet duplication with a second plurality of SL component carriers; and the operations further comprise: causing independent radio link monitoring (RLM) of each of the second plurality of SL component carriers; and declaring, based on the RLM detecting a failure of at least a first number of the second plurality of SL component carriers, a radio link failure (RLF) for the peer UE.
  15. 15. The baseband processor of claim 14, wherein the first number is one.
  16. 16. The baseband processor of claim 14, wherein the first number is a total number of the second plurality of SL component carriers.
  17. 17. A method for a user equipment (UE), the method comprising: receiving, from a peer UE, an indication whether the peer UE supports sidelink (SL) carrier aggregation (CA); and transmitting, to the peer UE, based on the peer UE supporting SL CA, an SL reconfiguration message configuring an SL data radio bearer (SL-DRB) to carry data from the UE to the peer UE.
  18. 18. The method of claim 17, wherein the SL reconfiguration message configures the SL- DRB for packet duplication or for SL CA.
  19. 19. The method of claim 17, wherein the SL reconfiguration message configures the SL- DRB with a first plurality of SL component carriers to carry the data from the UE to the peer UE.
  20. 20. The method of claim 19, further comprising: selecting the first plurality of SL component carriers from a plurality of allowed SL component carriers for transmission to the peer UE.

Description

SIDELINK CARRIER AGGREGATION FOR WIRELESS COMMUNICATION NETWORKS REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 63/518,770, filed on August 10, 2023, the contents of which are hereby incorporated herein by reference in their entirety. FIELD [0002] This disclosure relates to sidelink (SL) techniques for wireless communication networks. BACKGROUND [0003] Wireless communication networks and wireless communication services are becoming increasingly dynamic, complex, and ubiquitous. For example, some wireless communication networks may be developed to implement Fifth- Generation (5G) or New Radio (NR) technology, Sixth-Generation (6G) technology, and so on. Such technology may include solutions for enabling user equipment (UE) and network devices, such as base stations, to communicate with one another. A feature of such networks and devices may include SL communications, which are direct communications between two UEs. BRIEF DESCRIPTION OF THE DRAWINGS [0004] The present disclosure will be readily understood and enabled by the detailed description and accompanying figures of the drawings. Like reference numerals may designate like features and structural elements. Figures and corresponding descriptions are provided as non-limiting examples of aspects, implementations, etc., of the present disclosure, and references to "an" or “one” aspect, implementation, etc., may not necessarily refer to the same aspect, implementation, etc., and may mean at least one, one or more, etc. [0005] FIG. 1 is a diagram of an example wireless network, according to various aspects of the present disclosure. [0006] FIG. 2 is a message flow diagram illustrating messaging between a transmitting UE (TX UE) and a receiving UE (RX UE) to support SL communications therebetween, according to various aspects of the present disclosure. [0007] FIG. 3 is another message flow diagram illustrating messaging between a TX UE and an RX UE to support SL communication therebetween, according to various aspects of the present disclosure. [0008] FIG. 4 illustrates layers of a TX UE operating to configure a single component carrier (CC) for SL signal radio bearers (SRBs) used for SL communication with an RX UE, according to various aspects of the present disclosure. [0009] FIG. 5 illustrates layers of a TX UE operating to configure multiple CCs for SL- SRBs used for SL communication with an RX UE, according to various aspects of the present disclosure. [0010] FIG. 6 is a flow diagram outlining an example method for declaring a radio link failure (RLF) during SL communication, according to various aspects of the present disclosure. [0011] FIG. 7 is a flow diagram outlining another example method for declaring an RLF during SL communication, according to various aspects of the present disclosure. [0012] FIGS. 8 A and 8B are a flow diagram outlining yet another example method for declaring an RLF during SL communication, according to various aspects described. [0013] FIG. 9 is a flow diagram outlining yet another example method for declaring an RLF during SL communication, according to various aspects of the present disclosure. [0014] FIG. 10 is a flow diagram outlining an example method for employing a threshold number of carriers to determine whether to declare an RLF for an RX UE, according to various aspects of the present disclosure. [0015] FIG. 11 is a diagram of an example of components of a device according to various aspects of the present disclosure. DETAILED DESCRIPTION [0016] The following detailed description refers to the accompanying drawings. Like reference numbers in different drawings may identify the same or similar features, elements, operations, etc. Additionally, the present disclosure is not limited to the following description as other implementations may be utilized, and structural or logical changes made, without departing from the scope of the present disclosure. [0017] Communication in a wireless network may include downlink (DL) from a radio access network (RAN) node to a user equipment (UE), uplink (UL) from a UE to a RAN node, and sidelink (SL) communication between two peer UEs without directing the communication through a RAN node. One of several use cases for SL communication between UEs is Vehicle- to-Everything (V2X) communication, by which a vehicle may communicate with other vehicles, as well as other communicative elements (e.g., to facilitate autonomous transportation, enhance transportation safety, and so on). The interface facilitating such SL communication between UEs is often referred to as PC5. [0018] Within ongoing 3GPP (Third-Generation Partnership Project) standardization work, an effort has been made to support Fifth-Generation (5G) or New Radio (NR) SL carrier aggregation (CA) operation based on Fourth-Generation (4G) or Long-Term Evolution (LTE) SL CA operation. Generally, such work presumes that only aspects of LTE SL CA design (e.g., thos