Spectrum Sharing Coexistence via Priority Channel Access Intervals
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Solution Overview
Problem
Designing a communication scheme that allows for coexistence between synchronous and asynchronous channel access technologies is challenging due to differences in protocols, channel access procedures, and interference issues, making it difficult to ensure fair access and reduce interference between devices using different technologies.
Innovation Solution
The solution involves selecting channel access intervals with priority conditions and transmitting signals that include channel occupancy information and identification of subsequent access intervals, allowing devices to coordinate communications and avoid interference, particularly by using higher clear channel assessment deferral values and listen-before-talk procedures during low-priority intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spectrum sharing systems use synchronous channel access with priority conditions, then access fairness and interference reduction are improved, but system complexity increases due to coordination requirements between different access technologies
Solution Approach 1:
The channel access timeline is segmented into multiple channel access intervals, each with specific priority conditions. This segmentation allows different technologies to access the channel in discrete time slots, reducing interference while maintaining fairness without requiring continuous complex coordination.
Solution Approach 2:
Priority conditions and channel occupancy information are established in advance before channel access intervals begin. This preliminary configuration enables devices to understand their access rights and coordination requirements beforehand, reducing real-time coordination complexity while ensuring fair access.
2Object-affected harmful factors
If devices transmit channel occupancy information and subsequent interval identifiers during contention intervals, then interference reduction is improved, but transmission time and processing requirements increase
Solution Approach 1:
Multiple types of information (channel occupancy information for current interval and identifiers for subsequent intervals) are merged into a single signal transmission during the contention interval. This consolidation reduces the total transmission time compared to sending separate signals for each information type while maintaining effective interference reduction.
Solution Approach 2:
The channel occupancy information and subsequent interval identifiers are transmitted continuously during the contention interval without interruption. This continuous transmission ensures that all necessary coordination information is conveyed efficiently in one operation, minimizing time loss while maximizing interference reduction effectiveness.
3Reliability
If asynchronous channel access devices use listen-before-talk procedures with higher clear channel assessment deferral values, then coexistence fairness is improved, but channel access efficiency decreases
Solution Approach 1:
The clear channel assessment deferral values are dynamically adjusted based on the current channel access interval and priority conditions. During intervals where asynchronous devices have lower priority, higher deferral values are applied to ensure fairness. During intervals where efficiency is critical, deferral values are reduced to improve access efficiency, creating a dynamic balance between fairness and efficiency.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a device may select a plurality of channel access intervals during which the device is associated with a priority condition relative to another device for communications by the device, wherein each of the plurality of channel access intervals includes a respective contention interval and a respective transmission opportunity; and may transmit, during a contention interval of a first channel access interval of the plurality of channel access intervals, a signal that includes: channel occupancy information for the device for a first transmission opportunity of the first channel access interval, and information that identifies at least a portion of one or more subsequent channel access intervals, of the plurality of channel access intervals, associated with the device. Numerous other aspects are provided.