Relay UE Sidelink Forwarding for Reliable Beam Switching
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Solution Overview
Problem
In wireless communication systems, beam switching information transmission between a network node and a target UE can fail or be of poor quality, leading to repeated transmissions and degraded performance.
Innovation Solution
A relay UE relays beam switching information from a network node to a target UE via a sidelink interface, allowing the target UE to switch beams without waiting for a beam failure recovery process, thereby improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam switching information is transmitted directly from network node to target UE, then transmission path is simple, but transmission reliability deteriorates due to beam failure
Solution Approach 1:
A relay UE is introduced as an intermediary node to forward beam switching information from the network node to the target UE. The relay UE receives the information via a first message on a first communication path, processes it, and transmits it to the target UE via a second message on a second communication path, thereby improving transmission reliability without significantly increasing overall system complexity.
2Loss of time
If beam failure recovery process is waited for before beam switching, then beam switching accuracy is ensured, but time delay increases
Solution Approach 1:
The relay UE performs preliminary reception and forwarding of beam switching information before the target UE completes its beam failure recovery process. By receiving the first message from the network node and transmitting the second message to the target UE in advance, the system enables the target UE to switch beams faster without compromising reliability, as the information is prepared and transmitted proactively.
3Reliability
If repeated transmissions of beam switching information are performed, then information delivery reliability is improved, but system performance deteriorates
Solution Approach 1:
The relay UE acts as a mediator that consolidates and forwards beam switching information, reducing the need for repeated transmissions by the network node. Instead of the network node repeatedly sending information that may fail, the relay UE receives it once and forwards it through an alternative path, improving delivery reliability while maintaining system performance.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a relay user equipment (UE) may receive, from a network node, a first message, the first message indicating beam switching information for a target UE. The relay UE may transmit, to the target UE, a second message based at least in part on the first message, the second message indicating the beam switching information for the target UE. The relay UE may receive, from the target UE, an acknowledgement (ACK) associated with a receipt of the second message. Numerous other aspects are described.