NR V2X Frame Sensing for Unlicensed Sidelink Channel Access
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Solution Overview
Problem
In sidelink communication using an unlicensed band, a UE may fail to occupy a channel due to interference from other UEs, leading to increased battery consumption and unsatisfied quality of service (QoS) requirements.
Innovation Solution
A method and device for performing wireless communication that involves obtaining configuration information related to fixed frame periods (FFPs) and offsets, performing sensing across multiple FFPs, determining channel availability, and transmitting failure information when a threshold of non-idle channels is reached, thereby optimizing channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE continuously attempts to occupy the channel despite frame-based configuration failure, then channel occupancy may be achieved, but battery consumption increases due to unnecessary sensing
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors channel occupancy outcomes across multiple FFPs and compares against a threshold. When the number of non-idle channels reaches the threshold, the UE stops sensing and transmits failure information. This feedback-based stopping criterion eliminates unnecessary continuous sensing while maintaining reliable channel occupancy attempts, directly resolving the contradiction between reliability and energy consumption.
2Productivity
If a UE continuously attempts to occupy the channel despite frame-based configuration failure, then channel access persistence is maintained, but quality of service requirements are not satisfied
Solution Approach 1:
The patent dynamically adjusts the channel access strategy by implementing a threshold-based stopping mechanism. Instead of continuous static sensing, the UE adapts its sensing behavior based on the number of non-idle channels detected. When the threshold is reached, the UE transitions from continuous sensing to stopping and transmitting failure information. This dynamic approach optimizes channel access efficiency while ensuring QoS requirements are met by avoiding futile continuous attempts.
Data Source
AI summary
A method for performing wireless communication by a first device, and an apparatus for supporting the same. The method includes obtaining configuration information including at least one of information related to a first fixed frame period (FFP) or information related to a first FFP offset; determining a plurality of FFPs based on the configuration information; performing sensing related to the plurality of FFPs; determining whether a channel is idle within the plurality of FFPs based on the sensing related to the plurality of FFPs; and transmitting information related to a failure of the configuration information, based on a number of non-idle channels reaching a threshold.