Path Switching Negotiation for PC5-to-Uu Conflict Avoidance
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Solution Overview
Problem
Existing communication systems face conflicts and signaling waste during the transition from PC5-based communication to Uu interface due to independent trigger conditions for link quality threshold detection, leading to inconsistent negotiation and inefficient path switching procedures.
Innovation Solution
A path switching method and apparatus that utilizes target information, including timing information, initiator information, and random numbers to coordinate and negotiate the transition from direct communication to air interface, preventing simultaneous initiation of path switching procedures by multiple terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent trigger conditions for link quality threshold detection are used, then each terminal can independently initiate path switching, but conflicts and signaling waste occur during negotiation
Solution Approach 1:
The patent introduces a negotiation mechanism where terminals exchange path switch request messages before executing the switch. This intermediary negotiation process coordinates the independent initiation capability with conflict avoidance, allowing both terminals to independently detect threshold conditions while preventing simultaneous switching actions through mutual agreement protocols.
2Speed
If simultaneous path switching initiation by multiple terminals is allowed, then path switching responsiveness is improved, but negotiation conflicts occur
Solution Approach 1:
The patent implements a preliminary random number generation and comparison mechanism before path switching execution. Terminals generate random numbers independently upon detecting threshold conditions, then use these numbers to determine initiation priority. This preliminary action maintains responsiveness by allowing simultaneous detection while ensuring negotiation consistency through a predetermined conflict resolution rule based on random number comparison.
3Reliability
If path switching negotiation procedure is implemented, then switching conflicts are resolved, but procedure complexity increases
Solution Approach 1:
The patent changes the state of the system by introducing a random number parameter that terminals compare to determine initiation priority. This parameter change simplifies the negotiation procedure by providing a clear, objective criterion for conflict resolution, reducing the complexity of negotiation logic while maintaining reliability through the randomness-based priority assignment.
Data Source
AI summary
A path switching processing method is disclosed that includes: based on target information, a first terminal initiating a path switching procedure or executing a path switching procedure initiated by a second terminal, where the target information indicates at least one of timing information of a first switching wait timer of the first terminal; initiator information of the path switching procedure; a relationship between a direct communication link quality value and a first switching threshold, the first switching threshold being a switching threshold dedicated to the first terminal; or a first random number carried in a first path switch request and a second random number carried in a second path switch request.