Sidelink Channel Access Points for Shared-Spectrum Conflict Reduction
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Solution Overview
Problem
In sidelink communication on a shared spectrum, conflicts arise during channel access due to the lack of centralized scheduling, leading to inefficiencies and interference among multiple terminal devices using Listen Before Talk (LBT) mechanisms.
Innovation Solution
Determine configuration information for channel access points (CPEs) based on subcarrier spacing to manage channel access locations, ensuring multiple terminal devices can access shared resources without conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple terminal devices perform channel access through LBT on shared spectrum, then channel resources can be dynamically allocated, but channel access conflicts occur at channel access locations
Solution Approach 1:
The patent segments the channel access process by introducing Channel Access Points (CAPs) that divide the shared spectrum into multiple access opportunities. Each terminal device can select from multiple CAPs rather than competing for a single access point, thereby reducing conflicts while maintaining dynamic allocation capabilities
Solution Approach 2:
The patent introduces CAP configuration information as an intermediary mechanism that mediates between multiple terminal devices seeking channel access. This configuration information guides devices to appropriate CAPs, reducing direct conflicts while preserving the benefits of dynamic LBT-based access
2Reliability
If centralized scheduling is implemented to manage channel access, then channel access conflicts are reduced, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring CAP information before terminal devices perform channel access. This advance configuration reduces the need for complex real-time centralized scheduling during actual channel access, as devices can independently select from pre-defined CAPs based on the provided configuration
Solution Approach 2:
The patent enables terminal devices to self-select appropriate CAPs based on pre-configured information without requiring complex centralized scheduling intervention. This self-service approach reduces system complexity while maintaining effective conflict management through autonomous device decisions
Data Source
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AI summary
The present application provides a method and an apparatus for sidelink communication, which helps avoid an access conflict between a plurality of terminal devices when performing channel access on a shared spectrum. The method includes: A first terminal device determines first configuration information of a first shared resource. The first configuration information indicates one or more CPEs corresponding to the first shared resource. The one or more CPEs are determined based on a subcarrier spacing corresponding to the first shared resource. The one or more CPEs are used by a second terminal device to determine a time domain location for accessing the first shared resource.