Overlapping LBT Procedures for Priority-Based Wireless Signal Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing and prioritizing communication signals in shared spectrum environments, leading to potential collisions and increased latency due to sequential listen-before-talk (LBT) procedures.
Innovation Solution
Implementing a method where a wireless communication device performs overlapping first and second LBTs during different time periods for transmitting communication signals with varying priorities, allowing for simultaneous or prioritized transmission based on the results of each LBT, thereby improving spectrum sharing performance and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If sequential LBT procedures are used for transmitting communication signals with different priorities, then the channel access control is simple, but the LBT latency increases and spectrum sharing efficiency decreases
Solution Approach 1:
The patent combines multiple sequential LBT procedures into overlapping concurrent LBT operations. Specifically, a first LBT for high-priority signals and a second LBT for low-priority signals are performed concurrently with time overlap, allowing both procedures to progress in parallel rather than sequentially. This merging of operations reduces the total time required for channel access determination while maintaining the priority-based access control functionality.
Solution Approach 2:
The patent implements preliminary actions by starting the first LBT procedure before the second LBT procedure completes. The first LBT is initiated at a first time and continues overlapping with the second LBT that starts at a later time. This preliminary initiation of the high-priority channel access determination allows the system to make faster decisions about high-priority transmissions without waiting for the complete execution of low-priority LBT procedures.
2Productivity
If sequential LBT procedures are used, then the channel access control is straightforward, but the spectrum sharing efficiency decreases
Solution Approach 1:
The patent merges multiple LBT procedures into overlapping concurrent operations to improve spectrum sharing efficiency. By allowing the first LBT for high-priority signals and the second LBT for low-priority signals to proceed concurrently with time overlap, the system determines channel access for both priorities simultaneously rather than sequentially, thereby reducing the total time required for spectrum access determination and improving overall sharing efficiency.
Solution Approach 2:
The patent employs preliminary action by initiating the first LBT procedure before the second LBT procedure finishes executing. This allows the high-priority channel access determination to start early and progress in parallel with the low-priority LBT, reducing the total procedure duration and enabling faster spectrum access decisions that improve sharing efficiency.
3Reliability
If overlapping LBTs are performed for different priorities, then the LBT latency is reduced and spectrum sharing efficiency is improved, but the collision risk increases
Solution Approach 1:
The patent applies local quality by assigning different characteristics to different LBT procedures based on signal priority. The first LBT for high-priority signals uses different parameters (such as shorter duration or different sensing thresholds) compared to the second LBT for low-priority signals. This differentiation ensures that each LBT procedure is optimized for its specific priority level, reducing collisions for high-priority transmissions while maintaining appropriate access control for low-priority transmissions.
Solution Approach 2:
The patent implements feedback mechanisms where the results of the overlapping LBT procedures are evaluated to determine actual transmission permission. After both LBT procedures complete (even though they overlapped in time), the system uses the feedback from both LBT results to make the final transmission decision, allowing the device to transmit the high-priority signal if the first LBT passed, while still considering the outcome of the second LBT for low-priority signals to avoid collisions.
Data Source
AI summary
Wireless communications systems and methods related to transmitting communication signals are provided. A first wireless communication device performs a first LBT during a first time period for transmitting a first communication signal associated with a first priority. The first wireless communication device performs a second LBT during a second time period for transmitting a second communication signal associated with a second priority, wherein the first time period is at least partially overlapping with the second time period, and wherein the first priority is different from the second priority. The first wireless communication device communicates with a second wireless communication device, at least one of the first communication signal or the second communication signal based on at least one of the first LBT or the second LBT.