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US-20260129696-A1 - SIDELINK ASSISTED SYSTEM INFORMATION RECEPTION

US20260129696A1US 20260129696 A1US20260129696 A1US 20260129696A1US-20260129696-A1

Abstract

Methods, systems, and devices for wireless communications are described. A first UE may monitor for a system information block (SIB) message from a network entity via an access link. The first UE may transmit, via a sidelink communications link between the first UE and a second UE and based on failure to receive the SIB message via the access link, a SIB sidelink request message. The SIB sidelink request message may include a request to assist the first UE in obtaining the SIB message. The second UE may receive, via an access link and from the network entity identified by the SIB sidelink request message, the SIB message. The second UE may transmit, via the sidelink communications link, an assistance message that includes a SIB payload of the SIB message or joint decoding information associated with the SIB payload in accordance with the SIB sidelink request message.

Inventors

  • Guy SPIEGELSTEIN
  • Shay Landis
  • Ran Berliner
  • Moshe Ben-Ari
  • Amit BAR-OR TILLINGER
  • Konstantin KUPERSHLAK

Assignees

  • QUALCOMM INCORPORATED

Dates

Publication Date
20260507
Application Date
20241104

Claims (20)

  1. 1 . A first user equipment (UE), comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the first UE to: receive, via a sidelink communications link between the first UE and a second UE, a system information block (SIB) sidelink request message, wherein the SIB sidelink request message includes a request to assist the second UE in obtaining a SIB message from a network entity; receive, via an access link and from the network entity identified by the SIB sidelink request message, the SIB message; and transmit, via the sidelink communications link, an assistance message that includes a SIB payload of the SIB message or joint decoding information associated with the SIB payload in accordance with the SIB sidelink request message.
  2. 2 . The first UE of claim 1 , wherein, to transmit the assistance message, the one or more processors are individually or collectively operable to execute the code to cause the first UE to: transmit the assistance message that includes the SIB payload based at least in part on the SIB sidelink request message.
  3. 3 . The first UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to: decode the SIB message based at least in part on the SIB sidelink request message, wherein the assistance message that includes the SIB payload of the SIB message is transmitted based at least in part on successful decoding of the SIB message.
  4. 4 . The first UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to: transmit the SIB message via a sidelink interface of the first UE, wherein the assistance message is transmitted based at least in part on transmission of the SIB message via the sidelink interface.
  5. 5 . The first UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to: transmit the SIB sidelink request message via an access link interface of the first UE, wherein the assistance message is transmitted based at least in part on transmission of the SIB sidelink request message via the access link interface.
  6. 6 . The first UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to: determine whether to transmit the SIB payload or the joint decoding information based at least in part on the SIB sidelink request message.
  7. 7 . The first UE of claim 1 , wherein the SIB sidelink request message, the assistance message, or both comprise one or more unicast or groupcast messages.
  8. 8 . The first UE of claim 1 , wherein the joint decoding information comprises in-phase and quadrature (IQ) measurements, log-likelihood ratios (LLRs), or both.
  9. 9 . The first UE of claim 1 , wherein the SIB sidelink request message indicates a Public Land Mobile Network (PLMN), a Physical Cell Identity (PCI), an Absolute Radio Frequency channel number (ARFCN), or any combination thereof that identify the requested SIB message from the network entity.
  10. 10 . The first UE of claim 1 , wherein the sidelink communications link comprises a PC5 link.
  11. 11 . The first UE of claim 1 , wherein the access link comprises a Uu link.
  12. 12 . A first user equipment (UE), comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the first UE to: monitor for a system information block (SIB) message from a network entity via an access link; transmit, via a sidelink communications link between the first UE and a second UE and based at least in part on failure to receive the SIB message via the access link, a SIB sidelink request message, wherein the SIB sidelink request message includes a request to assist the first UE in obtaining the SIB message from the network entity; and receive, via the sidelink communications link, an assistance message that includes a SIB payload of the SIB message or joint decoding information associated with the SIB payload in accordance with the SIB sidelink request message.
  13. 13 . The first UE of claim 12 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to: transmit the SIB sidelink request message via a sidelink interface of the first UE, wherein the SIB sidelink request message via the sidelink communications link is transmitted based at least in part on transmission of the SIB sidelink request message to the sidelink interface.
  14. 14 . The first UE of claim 12 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to: transmit the assistance message via an access link interface of the first UE.
  15. 15 . The first UE of claim 12 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to: establish or re-establish a connection with the network entity based at least in part on the assistance message.
  16. 16 . The first UE of claim 12 , wherein the SIB sidelink request message, the assistance message, or both comprise one or more unicast or groupcast messages.
  17. 17 . The first UE of claim 12 , wherein the joint decoding information comprises in-phase and quadrature (IQ) measurements, log-likelihood ratios (LLRs), or both.
  18. 18 . The first UE of claim 12 , wherein the SIB sidelink request message indicates a Public Land Mobile Network (PLMN), a Physical Cell Identity (PCI), an Absolute Radio Frequency channel number (ARFCN), or any combination thereof that identify the requested SIB message from the network entity.
  19. 19 . The first UE of claim 12 , wherein the sidelink communications link comprises a PC5 link, the access link comprises a Uu link, or both.
  20. 20 . A method for wireless communications by a first user equipment (UE), comprising: monitoring for a system information block (SIB) message from a network entity via an access link; transmitting, via a sidelink communications link between the first UE and a second UE and based at least in part on failure to receive the SIB message via the access link, a SIB sidelink request message, wherein the SIB sidelink request message includes a request to assist the first UE in obtaining the SIB message from the network entity; and receiving, via the sidelink communications link, an assistance message that includes a SIB payload of the SIB message or joint decoding information associated with the SIB payload in accordance with the SIB sidelink request message.

Description

FIELD OF TECHNOLOGY The following relates to wireless communications, including sidelink assisted system information reception. BACKGROUND Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE). UEs may communicate via sidelink communications links. SUMMARY The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein. A method for wireless communications by a first user equipment (UE) is described. The method may include receiving, via a sidelink communications link between the first UE and a second UE, a system information block (SIB) sidelink request message, where the SIB sidelink request message includes a request to assist the second UE in obtaining a SIB message from a network entity, receiving, via an access link and from the network entity identified by the SIB sidelink request message, the SIB message, and transmitting, via the sidelink communications link, an assistance message that includes a SIB payload of the SIB message or joint decoding information associated with the SIB payload in accordance with the SIB sidelink request message. A first UE for wireless communications is described. The first UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the first UE to receive, via a sidelink communications link between the first UE and a second UE, an SIB sidelink request message, where the SIB sidelink request message includes a request to assist the second UE in obtaining a SIB message from a network entity, receive, via an access link and from the network entity identified by the SIB sidelink request message, the SIB message, and transmit, via the sidelink communications link, an assistance message that includes a SIB payload of the SIB message or joint decoding information associated with the SIB payload in accordance with the SIB sidelink request message. Another first UE for wireless communications is described. The first UE may include means for receiving, via a sidelink communications link between the first UE and a second UE, an SIB sidelink request message, where the SIB sidelink request message includes a request to assist the second UE in obtaining a SIB message from a network entity, means for receiving, via an access link and from the network entity identified by the SIB sidelink request message, the SIB message, and means for transmitting, via the sidelink communications link, an assistance message that includes a SIB payload of the SIB message or joint decoding information associated with the SIB payload in accordance with the SIB sidelink request message. A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive, via a sidelink communications link between the first UE and a second UE, an SIB sidelink request message, where the SIB sidelink request message includes a request to assist the second UE in obtaining a SIB message from a network entity, receive, via an access link and from the network entity identified by the SIB sidelink request message, the SIB message, and transmit, via the sidelink communications link, an assistance message that includes a SIB payload of the SIB message or joint decoding information associated with the SIB payload in accordance with the SIB sidelink request message. In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, transmitting the assistance message may include operations, features, means, or instructions for transmitting the assistance message that includes the SIB payload based on the SIB sidelink request message. Some examples of the method, first UEs, and non-transitory computer-read