Coordinated LBT Procedure for Shared Spectrum Access
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing access to shared radio frequency spectrum bands, particularly in coordinating Listen Before Talk (LBT) procedures among network operating entities with different priorities, leading to potential interference and inefficient resource allocation.
Innovation Solution
A coordinated LBT procedure is implemented, where wireless devices identify their priority and refrain from transmitting during predetermined transmission intervals associated with higher priorities, allowing only higher-priority devices to initiate transmissions, and lower-priority devices to access the spectrum only after detecting the absence of higher-priority transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple network operating entities with different priorities contend for access to a shared radio frequency spectrum band using traditional LBT procedures, then the spectrum utilization increases, but interference and collision between transmissions increase
Solution Approach 1:
The patent applies preliminary action by implementing a priority-based channel access mechanism where higher-priority network operating entities perform LBT procedures and secure channel access before lower-priority entities attempt transmission. This preliminary securing of channel access by high-priority entities prevents interference with their transmissions, while still allowing spectrum utilization through opportunistic access by lower-priority entities when the channel is clear.
2Object-affected harmful factors
If higher-priority devices are granted exclusive access to the spectrum band, then interference is reduced, but resource allocation efficiency decreases
Solution Approach 1:
The patent applies local quality by differentiating channel access rights based on priority levels. Higher-priority network operating entities are granted exclusive access rights during their transmission opportunities, ensuring no interference. Lower-priority entities are given opportunistic access rights when the channel is clear. This localized differentiation of access quality based on priority ensures interference protection for high-priority transmissions while maintaining resource allocation efficiency through opportunistic utilization by lower-priority entities.
3Productivity
If lower-priority devices transmit simultaneously with higher-priority devices, then resource allocation efficiency increases, but transmission reliability decreases
Solution Approach 1:
The patent applies preliminary action by requiring lower-priority network operating entities to perform LBT procedures and detect channel clearness before transmitting. This preliminary channel assessment ensures that lower-priority transmissions only occur when the channel is clear of higher-priority transmissions, thereby maintaining transmission reliability while allowing resource allocation efficiency through opportunistic access.
4Reliability
If a coordinated LBT procedure with multiple CCA slots is implemented, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the LBT procedure into multiple distinct CCA (Clear Channel Assessment) slots, each corresponding to different priority levels. This segmentation allows the system to methodically assess channel clearness for each priority level in sequence, improving transmission reliability through thorough channel checking while managing device complexity through structured, modular procedure design.
Data Source
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AI summary
Techniques are described for wireless communication at a wireless device. One method includes identifying a priority of the wireless device for a transmission interval of a radio frequency spectrum band shared by a plurality of network operating entities; identifying an absence of a predetermined transmission type in each of a number of clear channel assessment (CCA) slots of the transmission interval, in which each of the number of CCA slots is associated with a higher priority than the identified priority of the wireless device; and communicating over the radio frequency spectrum band based at least in part on the identified absence of the predetermined transmission type in each of the number of CCA slots associated with the higher priority than the priority of the wireless device.