Beam management for new radio vehicle communications

Patent metadata

Field	Value
Publication number	US-12328172-B2
Application number	US-202017632360-A
Country	US
Kind code	B2
Filing date	Aug 12, 2020
Priority date	Aug 16, 2019
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

A user equipment (UE) determines sidelink resources for use in vehicle wireless communications. Initial beam establishment uses a Sidelink Synchronization Signal (SLSS), a Sidelink Channel State Information Reference Signal (SL-CSI-RS), or a Sidelink Demodulation Reference Signal (SL-DMRS). Beam refinement may then be conducted either by UEs in communication with each other, or by just one of the UEs. A base station such as a gNB may assign resources for a dedicated sidelink carrier or a shared licensed sidelink carrier, e.g., dynamically, as pre-configured by RRC, or based on activation and deactivation. In such cases, initial beam establishment and refinement may include gNB controlled beam forming at a connectionless stage, gNB controlled beam forming at connection stage with scheduling DCI transmitted to Tx UE only, or gNB controlled beam forming at connection stage with scheduling DCI transmitted to both Tx UE and Rx UE.

First claim

What is claimed is:

1. A first wireless transmit/receive unit (WTRU) comprising:
a processor and a memory, wherein the processor and the memory are configured to:
send, to a second WTRU, an initial beam pair link establishment indicator, wherein the initial beam pair link establishment indicator comprises information indicating time domain and frequency domain resources to be used for initial beam sweeping;
transmit a first set of swept beams via the time domain and frequency domain resources indicated by the initial beam pair link establishment indicator, each beam of the first set of swept beams comprising a reference signal; and
receive, from the second WTRU, an indication of one or more preferred beams comprising one or more beams selected from the first set of swept beams.

2. The first WTRU of claim 1 , wherein the initial beam pair link establishment indicator is a Sidelink Demodulation Reference Signal (SL-DMRS) transmitted on a Physical Sidelink Control Channel (PSCCH).

3. The first WTRU of claim 1 , wherein the initial beam pair link establishment indicator is a Medium Access Control-Control Element (MAC-CE) transmitted on a Physical Sidelink Control Channel (PSCCH).

4. The first WTRU of claim 1 , wherein the reference signal transmitted on the swept beams is a Sidelink Demodulation Reference Signal (SL-DMRS).

5. The first WTRU of claim 1 , wherein the initial beam pair link establishment indicator comprises a reference signal configuration to be used for initial beam sweeping.

6. The first WTRU of claim 1 , wherein the processor and the memory are further configured to:
initiate beam pair link establishment with the second WTRU in response to a trigger from a higher layer of the first WTRU.

7. The first WTRU of claim 6 , wherein the trigger is based on a Quality of Service (QOS) requirement.

8. The first WTRU of claim 1 , wherein the processor and the memory are further configured to:
send, to the second WTRU, the initial beam pair link establishment indicator in a first frequency range; and
transmit the first set of swept beams in a second frequency range.

9. The first WTRU of claim 8 , wherein the processor and the memory are further configured to receive, from the second WTRU in a connectionless state, the indication of one or more preferred beams via the first frequency range.

10. A second wireless transmit/receive unit (WTRU) comprising:
a processor and a memory, wherein the processor and the memory are configured to:
receive, from a first WTRU, an initial beam pair link establishment indicator, wherein the initial beam pair link establishment indicator comprises information indicating time domain and frequency domain resources to be used for initial beam sweeping;
receive, from the first WTRU, one or more beams of a first set of swept beams via the time and frequency domain resources indicated by the initial beam pair link establishment indicator, each received beam comprising a reference signal;
select, from the one or more received beams, one or more preferred beams; and
send, to the first WTRU, an indication of the one or more preferred beams.

11. The second WTRU of claim 10 , wherein the processor and the memory are further configured to indicate to the first WTRU that none of the received beams meets a minimum quality threshold.

12. The second WTRU of claim 10 , wherein the processor and the memory are further configured to select the one or more preferred beams on the basis of one or more of Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Layer-1 Signal to Interference Noise Ratio (L1-SINR).

13. The second WTRU of claim 10 , wherein the initial beam pair link establishment indicator is a Sidelink Demodulation Reference Signal (SL-DMRS) transmitted on a Physical Sidelink Control Channel (PSCCH).

14. The second WTRU of claim 10 , wherein the initial beam pair link establishment indicator is a Medium Access Control-Control Element (MAC-CE) transmitted on a Physical Sidelink Control Channel (PSCCH).

15. The first WTRU of claim 10 , wherein the reference signal transmitted on the swept beams is a Sidelink Demodulation Reference Signal (SL-DMRS).

16. The second WTRU of claim 10 , wherein the initial beam pair link establishment indicator comprises a reference signal configuration to be used for initial beam sweeping.

17. The second WTRU of claim 10 , wherein the processor and the memory are further configured to:
receive, from the first WTRU, the initial beam pair link establishment indicator in a first frequency range; and
receive, from the first WTRU, one or more beams of the first set of swept beams in a second frequency range.

18. The second WTRU of claim 17 , wherein the processor and the memory are further configured to send, to the first WTRU in a connectionless state, the indication of one or more preferred beams via the first frequency range.

Assignees

• Interdigital Patent Holdings Inc

Inventors

• Li Yifan
• Li Qing
• Zhang Guodong
• Tsai Allan Y
• Adjakple Pascal M
• Iyer Lakshmi R
• Awadin Mohamed
• Murray Joseph M
• Chen Zhuo
• Di Girolamo Rocco

Classifications

• H04B7/0695 Primary

  using beam selection · CPC title

• H04B7/0696 Primary

  Determining beam pairs · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W92/18

  between terminal devices · CPC title

• H04W72/1263

  Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows · CPC title