WLAN Terminal Spatial Reuse Control for Low-Latency TXOP Access
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Solution Overview
Problem
In densely populated wireless LAN environments, the increased traffic leads to reduced TXOP opportunities due to collisions and exposed nodes, reducing transmission efficiency in IEEE 802.11 standards, which are not fully addressed by IEEE 802.11ax's Inter-BSS spatial reuse technology.
Innovation Solution
A radio terminal apparatus and method that includes transmitting and receiving SR link information with power detection levels and color indices to manage CCA resets, allowing for enhanced spatial reuse within the same radio system, thereby increasing TXOP opportunities and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frame aggregation is used to improve transmission efficiency, then throughput speed increases, but transmission error probability increases
Solution Approach 1:
The patent segments the aggregated frame into multiple individual MPDUs, each with its own error detection and correction mechanisms. This allows error isolation at the MPDU level rather than affecting the entire aggregated frame, resolving the contradiction between maintaining high throughput through aggregation and reducing error probability through segmentation with individual error control.
2Productivity
If Inter-BSS spatial reuse technology is used to alleviate collision problems, then transmission efficiency improves partially, but the problem is not fully solved in densely populated environments
Solution Approach 1:
The patent applies different spatial reuse parameters (such as power detection levels and CCA reset conditions) to different BSS contexts. By configuring apparatuses to perform CCA reset based on specific conditions like receiving frames from certain BSSs or meeting power threshold criteria, the system achieves localized optimization that fully addresses collision problems in densely populated environments rather than applying a uniform Inter-BSS spatial reuse approach.
3Productivity
If more TXOP opportunities are obtained to increase throughput, then transmission efficiency improves, but latency increases due to waiting for channel access
Solution Approach 1:
The patent dynamically adjusts TXOP acquisition behavior based on real-time channel conditions and traffic requirements. By enabling apparatuses to perform CCA reset and attempt channel access under specific conditions (such as when receiving frames below certain power levels or from specific BSSs), the system optimizes the balance between obtaining sufficient TXOP opportunities for high throughput and minimizing waiting time for urgent transmissions, thereby reducing latency while maintaining throughput.
Data Source
AI summary
A base station apparatus transmits, to a terminal apparatus, SR link information including information indicating multiple terminal apparatuses supporting intra-BSS SR, a color index associated with the information indicating the terminal apparatuses, and information of a power detection level corresponding to a combination of the terminal apparatuses. The terminal apparatus receives the SR link information. The terminal apparatus receives a radio frame, and compares the power detection level determined based on the color index included in a PHY header of the radio frame being received, the multiple terminal apparatuses indicated by the color index, the information of the power detection level corresponding to the multiple terminal apparatuses indicated by the color index, and transmit power and received power of the radio frame being received. In a case that the received power of the radio frame being received is low, the terminal apparatus performs CCA reset, and transmits the radio frame with the transmit power configured. Intra-BSS SR is performed for data used by an application in which traffic with high priority and/or with low latency is specified to allow communication efficiency to be improved in coordination with the application.