Sidelink Relay Link Issue Signalling
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Solution Overview
Problem
In sidelink relay systems, link issues such as congestion, degradation, and failures at one hop are not effectively communicated to nodes on the second hop, leading to increased latency, data loss, and degradation of Quality-of-Service (QoS).
Innovation Solution
A method and apparatus for signalling link issues in a sidelink relay system, where a relay UE node detects link issues on PC5 links and provides link issue feedback information, including flow information, to impacted nodes, allowing them to take appropriate actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If link issue feedback information is not transmitted from relay UE to impacted nodes, then the system maintains simpler signalling protocols, but link issues such as congestion and failures are not communicated to second-hop nodes, leading to increased latency and data loss
Solution Approach 1:
The patent implements a feedback mechanism where the relay UE detects link issues on PC5 links and transmits link issue feedback information to impacted nodes. This feedback includes details about the link issue type (congestion, failure, degradation) and allows receiving nodes to take appropriate actions, thereby resolving the contradiction by enabling reliable link issue communication without requiring complete protocol redesign
Solution Approach 2:
The relay UE acts as an intermediary node that detects link issues on its links and communicates this information to impacted nodes on the second hop. This intermediary role enables the propagation of link issue information across hops without requiring direct detection capabilities at each node, thus improving reliability while maintaining manageable signalling complexity
2Productivity
If link issue feedback information is transmitted to all impacted nodes, then QoS degradation is minimized and re-transmissions are reduced, but the signalling overhead and processing load increase
Solution Approach 1:
The patent applies local quality by tailoring the link issue feedback information to the specific impacted node and the specific link issue. The feedback includes targeted information about the type of link issue (congestion, failure, degradation) and is sent only to nodes that are actually impacted by the issue on the second hop. This selective approach reduces signalling overhead while ensuring that each impacted node receives the specific information it needs to take appropriate action
Solution Approach 2:
The link issue feedback mechanism is segmented by link issue type (congestion, failure, degradation) and by impacted node. Each feedback message is customized to the specific combination of link issue and impacted node, allowing for efficient transmission of only the necessary information. This segmentation reduces the overall signalling overhead compared to a blanket feedback approach while maintaining high data transmission efficiency
Data Source
AI summary
A method for signalling a link issue in a wireless communication system comprising a relay UE node and a plurality of nodes is described. The relay UE node is configured to relay data between a first UE of the plurality of nodes and a second UE of the plurality of nodes. The method at the relay UE node includes: detecting a link issue associated with at least one of a first PC5 link established between the first UE and the relay node, and a second PC5 link established between the second UE and the relay node; after detecting the link issue, generating link issue feedback information for the detected link issue, the link issue feedback information including information for identifying a type of the detected link issue; sending the link issue feedback information to at least one of the first UE and the second UE.