Sidelink Positioning Channel Access Failure Management
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Solution Overview
Problem
Current wireless communication systems face challenges in managing channel access failures during sidelink positioning operations in unlicensed or shared spectrum, which can lead to unreliable positioning and ranging in scenarios like vehicle-to-everything (V2X) communication.
Innovation Solution
Implementing a timer-based mechanism for channel access monitoring, where user equipment (UE) initiates and synchronizes timers with other sidelink devices to track channel access, and transmits a message indicating failure if access is not successful within a predetermined time, allowing for retry or session termination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timer-based channel access monitoring is implemented for sidelink positioning, then reliability of positioning is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by establishing synchronization timers before channel access operations begin. The initiating UE configures the timer duration and communicates it to responding UEs in advance, enabling all devices to proactively monitor channel access status without requiring complex real-time negotiation during the positioning operation.
Solution Approach 2:
The patent implements feedback mechanisms where UEs transmit failure indication messages when channel access fails. The initiating UE monitors for these feedback messages from responding UEs, enabling centralized detection and management of channel access failures across the sidelink positioning group without requiring each device to independently track all failures.
2Measurement precision
If synchronized timers are used to monitor channel access across multiple sidelink devices, then positioning accuracy is improved, but loss of time increases due to coordination overhead
Solution Approach 1:
The patent merges the timer management functions into a single initiating UE that configures and distributes timer parameters to all responding UEs. This consolidation eliminates the need for multiple independent timer synchronization protocols, reducing coordination overhead while maintaining synchronized monitoring across all devices for accurate positioning measurements.
3Reliability
If channel access failure detection is implemented through timer expiry, then availability of positioning information is improved, but productivity decreases due to retry operations
Solution Approach 1:
The patent applies partial action by implementing selective retry operations only for specific failing UEs or specific positioning measurements rather than restarting all positioning operations. The initiating UE can choose to retry with modified parameters for individual failures while maintaining successful operations, minimizing overall productivity impact while ensuring availability of positioning information.
Data Source
AI summary
A wireless device can use a channel occupancy time (COT) to reserve a spectrum for sidelink positioning operations in a certain time interval. In some examples, multiple wireless devices can share the same COT for performing sidelink positioning and/or ranging operations using unlicensed or shared spectrum. Some aspects of the disclosure provide various processes for handling scenarios when channel access of the unlicensed spectrum is unsuccessful.