Relay WTRU Paging for NR Sidelink Coverage Extension
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Solution Overview
Problem
Existing NR-based sidelink communication systems face limitations in coverage extension and QoS requirements, particularly in scenarios without a Uu reference point interface, and current UE-to-UE coverage extension is insufficient for enhanced connectivity.
Innovation Solution
The method involves a relay wireless transmit/receive unit (WTRU) that receives an indication of a state change in a remote WTRU, processes paging messages, and transmits updated system information to extend sidelink connectivity, supporting enhanced QoS requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If single-hop sidelink coverage extension is used, then implementation simplicity is maintained, but coverage range and connectivity reliability are insufficient
Solution Approach 1:
The patent divides the coverage extension into multiple hops, where each relay UE extends the coverage by one additional hop. This segmentation allows the system to achieve extended coverage range while keeping each individual relay node relatively simple, resolving the contradiction between coverage range and device complexity
Solution Approach 2:
The patent introduces relay UEs as intermediary nodes between the network and remote UEs. These intermediaries enable multi-hop communication, extending coverage range while distributing the complexity across multiple simple relay nodes rather than requiring a single complex node
2Reliability
If relay UEs monitor multiple remote UE paging occasions, then paging delivery reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by having relay UEs monitor only a subset of remote UE paging occasions or use sampling strategies rather than monitoring all occasions continuously. This reduces power consumption while maintaining adequate paging delivery reliability through selective monitoring
Solution Approach 2:
The patent implements periodic monitoring of paging occasions at relay UEs, where monitoring occurs at specific intervals rather than continuously. This periodic action reduces power consumption while maintaining paging delivery reliability by checking at regular intervals
3Length of moving object
If EUTRA-based UE-to-network relay is used, then coverage extension is achieved, but compatibility with NR-based systems is lost
Solution Approach 1:
The patent creates a universal relay mechanism that works across both EUTRA and NR systems. The relay UE functionality is designed to be technology-agnostic, enabling the same coverage extension approach to be applied in both LTE and 5G NR contexts, thus achieving both coverage extension and technology compatibility
Data Source
AI summary
A method performed by a relay wireless transmit/receive unit (WTRU) includes receiving an indication of a change in state of a remote WTRU having a paging link with the relay WTRU, receiving a paging message from a network. The paging message includes a system information (SI) change indication, wherein the SI change indication indicates an availability of updated SI information from the network for the remote WTRU. The relay WTRU transmits the updated SI information to the remote WTRU based on the received indication of a change in state of the remote WTRU.