Sidelink Context Management for Fast Link Recovery
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Solution Overview
Problem
Current wireless communication systems face challenges in detecting and recovering from failures in sidelink communication links, which are essential for maintaining reliable direct device-to-device connections, particularly in scenarios like V2X communications.
Innovation Solution
A method and apparatus that involve a wireless device performing direct communication with another device based on stored context, detecting link failures using a timer, and transmitting recovery information when the link quality improves, allowing for swift resumption of sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wireless device clears the context upon detecting link failure, then the system complexity is reduced, but the recovery time increases
Solution Approach 1:
The patent applies preliminary action by starting a timer immediately upon detecting link failure, before the context is cleared. This allows the device to detect recovery conditions while the context is still preserved, enabling faster resumption of communication without waiting for context clearance and re-establishment procedures.
Solution Approach 2:
The patent implements beforehand cushioning by maintaining the context in a suspended state during the timer period, protecting it from being cleared immediately. This cushioning mechanism ensures that if the link recovers within the timer period, the context is already prepared and can be quickly reactivated, reducing recovery time while managing complexity through controlled context retention.
2Speed
If the wireless device maintains context during timer period, then the recovery speed is improved, but the memory usage increases
Solution Approach 1:
The context is prepared and maintained in advance during the timer period, allowing immediate resumption of communication if recovery is detected. This preliminary preparation eliminates the need for time-consuming context re-establishment procedures, achieving fast recovery while limiting memory usage to only the duration of the timer period.
Solution Approach 2:
The patent changes the state parameter of the context from 'active' to 'suspended' during the timer period, maintaining the context data in memory but marking it as inactive. This parameter change allows the context to be preserved for quick recovery while managing memory resources efficiently, as the suspended context can be cleared if the timer expires without recovery.
3Reliability
If the wireless device transmits recovery information immediately upon quality improvement, then the communication reliability is improved, but the energy consumption increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the link quality during the timer period and using this feedback to determine when to transmit recovery information. This feedback mechanism ensures that recovery is only declared when the link quality has genuinely improved, enhancing communication reliability while avoiding unnecessary transmissions that would waste energy.
Solution Approach 2:
The quality improvement is detected and prepared for transmission during the timer period, but the actual transmission is timed to occur at the appropriate moment when recovery is confirmed. This preliminary detection and timed transmission approach ensures reliable recovery communication while optimizing energy consumption by avoiding premature or unnecessary transmissions.
Data Source
AI summary
The present disclosure relates to sidelink communication in wireless communications. According to an embodiment of the present disclosure, a method performed by a first wireless device in a wireless communication system comprises: performing a direct communication with a second wireless device via a communication link based on a context stored in the first wireless device; detecting a failure of the communication link upon which a timer starts, wherein the context remains stored in the first wireless device while the timer is running; and upon detecting a good quality of the communication link while the timer is running, transmitting information indicating a recovery of the communication link based on the context to the second wireless device.