PC5 Keep-Alive Coordination for V2X Unicast Link Monitoring
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Solution Overview
Problem
In vehicle-to-everything (V2X) communication, the lack of coordination in keep-alive (KA) mechanisms between peer UEs can lead to redundant PC5 signaling messages and inefficient link maintenance due to simultaneous KA requests, especially in direct peer-to-peer communications over PC5 unicast links.
Innovation Solution
Implementing KA coordination schemes that designate a specific UE as the KA initiator based on timer configurations, last action, or random number generation to avoid simultaneous KA requests, ensuring efficient and coordinated link maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If keep-alive requests are sent independently by each UE without coordination, then link status monitoring is performed, but redundant signaling messages are generated and signaling efficiency deteriorates
Solution Approach 1:
The patent merges the keep-alive request functions of multiple UEs by designating a single KA initiator. Instead of each UE independently sending keep-alive requests, the coordinated approach combines these functions into one UE that sends requests on behalf of the pair, eliminating redundant signaling while maintaining link status monitoring.
Solution Approach 2:
The patent introduces a coordination mechanism that acts as an intermediary between UEs. The KA initiator designation and timer coordination serve as the intermediary structure that manages keep-alive signaling, preventing simultaneous requests from multiple UEs and reducing signaling overhead.
2Reliability
If multiple UEs send simultaneous keep-alive requests, then link status is monitored, but unnecessary traffic is generated and network resources are wasted
Solution Approach 1:
The patent combines the link maintenance functions of multiple UEs into a single coordinated operation. By designating one KA initiator per UE pair and using asymmetric timer configurations, the system merges redundant keep-alive operations into a single efficient request, preventing simultaneous transmissions and conserving network resources.
Solution Approach 2:
The patent implements periodic keep-alive requests through timer mechanisms. The KA initiator sends requests at configured intervals determined by timer values, ensuring systematic link maintenance while avoiding simultaneous periodic actions from multiple UEs through coordinated timer management.
3Productivity
If asymmetric timer values are configured for KA initiator and non-initiator UEs, then simultaneous KA requests are avoided, but timer configuration complexity increases
Solution Approach 1:
The patent applies asymmetry by configuring different timer values for the KA initiator and non-initiator UEs. This asymmetric timer configuration ensures that the initiator and non-initiator have different expiration times, preventing simultaneous keep-alive requests while maintaining clear role differentiation in the coordination mechanism.
Solution Approach 2:
The patent changes the timer parameter values to resolve conflicts. By adjusting the timer expiration values asymmetrically between initiator and non-initiator UEs, the system prevents simultaneous requests. The parameter change approach allows flexible configuration to avoid collisions while maintaining systematic coordination.
Data Source
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AI summary
A service device (e.g., a user equipment (UE), or other network component) can operate generate sidelink communications with peer UE devices based on PC5 unicast link to enable a direct peer-to-peer communication as part of PC5 vehicle-to-everything (V2X) communications. Radio status link detection can be configured based on a keep alive (KA) coordination scheme via the PC5 unicast link to monitor a status of the PC5 unicast link. A KA timer can be configured based on the KA coordination scheme via the PC5 unicast link. The KA coordination scheme is configured to reduce redundant KA requests in the PC5 unicast link to coordinate the direct peer-to-peer communication across the PC5 unicast link.