Sidelink Relay Reselection Using Proactive U2U Solicitation
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Solution Overview
Problem
Existing methods for relay reselection in sidelink communication, particularly in high mobility scenarios like V2X and high-speed trains, fail to ensure service continuity and QoS due to abrupt sidelink failures and reliance on time-consuming rediscovery procedures.
Innovation Solution
A method where the current U2U relay initiates a solicitation message for relay reselection, including layer 2 IDs and service contextual information, allowing candidate relays to respond with service assistance information, enabling efficient relay reselection based on QoS and load considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source UE performs relay discovery and selection procedures from scratch after sidelink failure, then a new relay can be found, but the service continuity is broken and time is consumed
Solution Approach 1:
The current relay performs preliminary actions by proactively sending solicitation messages to neighboring relays before actual failure occurs, gathering information about candidate relays in advance. This preliminary relay reselection preparation enables faster switching when failure happens, maintaining service continuity while reducing rediscovery time.
2Reliability
If the source UE waits for relay failure before initiating reselection, then relay selection can be based on actual need, but communication breakdown occurs during high mobility scenarios
Solution Approach 1:
The current relay proactively initiates relay reselection by sending solicitation messages before actual communication failure occurs. This preliminary action allows the system to prepare candidate relays in advance, enabling continuous communication during high mobility scenarios without waiting for failure, thus maintaining both reliability and productivity.
Solution Approach 2:
The solicitation message includes feedback mechanisms where candidate relays provide service assistance information about their capabilities and status. This feedback loop enables the current relay to make informed reselection decisions based on real-time conditions, improving both communication reliability and efficiency during dynamic scenarios.
3Reliability
If relay reselection uses comprehensive service assistance information from candidate relays, then QoS can be optimized, but the reselection process becomes more complex
Solution Approach 1:
The current relay acts as an intermediary that collects service assistance information from candidate relays and performs the reselection decision on behalf of the source UE. This intermediary role simplifies the overall process by centralizing the decision-making function, while still enabling optimized QoS selection based on comprehensive relay capabilities.
Data Source
AI summary
The invention relates to method for optimizing relay reselection of sidelink communication between a source user equipment and a target user equipment, the method comprising: —sending a solicitation message for a relay reselection by a first U2U relay to at least one U2U relay in the vicinity, wherein the sidelink communication is initially established via the first U2U relay; and —sending a response message to respond to the solicitation message, by at least one candidate U2U relay among the at least one U2U relay in the vicinity, for relay reselection. The invention improves efficiency for the relay reselection.