User Equipment L2-Identity Reporting for Sidelink Relay Path Switch
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Solution Overview
Problem
Existing technologies face challenges in managing UE identity and RRC state changes during switches between direct and indirect connections in NR sidelink relaying, which can lead to delays and quality of service issues due to incorrect or missing L2-IDs.
Innovation Solution
The method involves UE transmitting L2-IDs and RRC state information to the network under specific conditions, such as receipt of certain network messages or changes in UE capabilities, to ensure timely and accurate reporting of L2-IDs and RRC states during path switch procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If UE waits for network to request L2-ID information, then signaling messages are reduced, but handover delay increases and L2-ID may be missing when needed
Solution Approach 1:
The patent applies preliminary action by having the UE proactively report its L2-ID and RRC state information to the network before handover is actually needed. The UE monitors for triggering conditions (such as receiving capability enquiry messages or measurement configurations) and reports L2-ID information in advance, ensuring the network has the necessary information ready for immediate handover execution without delays.
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously monitors network messages and reports L2-ID information based on triggering conditions. The network receives feedback about the UE's current state (L2-ID, RRC state) and can use this information to make informed handover decisions, reducing uncertainty and enabling faster handover execution.
2Reliability
If UE reports L2-ID information proactively, then handover completeness improves, but signaling messages increase
Solution Approach 1:
The patent applies partial action by having the UE report only the necessary L2-ID information when specific triggering conditions are met, rather than continuously reporting all possible information. The UE monitors for conditions such as capability enquiry messages, measurement configurations, or path switch configurations, and reports L2-ID information only when these conditions occur, reducing unnecessary signaling overhead while ensuring completeness when needed.
Solution Approach 2:
The patent implements self-service by having the UE autonomously determine when to report L2-ID information based on locally monitored triggering conditions. The UE independently evaluates whether network messages indicate a need for L2-ID reporting and initiates reports accordingly, without requiring continuous network instruction, thereby reducing signaling overhead while maintaining reliability.
3Speed
If network waits for UE to report L2-ID, then UE autonomy is maintained, but handover timing is delayed
Solution Approach 1:
The patent applies preliminary action by having the UE prepare and report L2-ID information in advance before handover is actually executed. The UE monitors for triggering conditions such as capability enquiry messages or measurement configurations and reports L2-ID information proactively, ensuring the network has all necessary information ready for immediate handover execution without waiting for additional UE reports during the handover process.
4Reliability
If L2-ID is not reported timely, then signaling messages are minimized, but path switch procedure becomes incomplete
Solution Approach 1:
The patent implements feedback mechanisms where the UE monitors network messages and reports L2-ID information based on triggering conditions such as capability enquiry messages, measurement configurations, or path switch configurations. This feedback loop ensures the network receives necessary L2-ID information at appropriate times, enabling complete path switch procedures while managing message processing complexity through condition-based reporting.
Data Source
AI summary
Provided in the present invention are a method performed by user equipment, and user equipment. The method includes: in the case that UE having a layer-2 U2N remote UE capability satisfies at least one of the following conditions, transmitting, by the UE, an RRC message to indicate an L2-ID to a network, wherein the conditions include: a UE capability enquiry message transmitted by the network is received; an RRC reconfiguration message transmitted by the network is received, and the message includes a measurement configuration of relay UE; the UE enables a function of layer-2 remote UE; a source L2-ID of the UE is changed; the UE initiates a measurement report procedure, and if at least one applicable candidate relay UE needs to be reported, and a report type is set to event-triggered or periodically-triggered; and an RRC reconfiguration message transmitted by the network is received, and the message includes an sl-PathSwitchConfig field.