Radio Frame Transmission Control via PHY Header Demodulation
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Solution Overview
Problem
In densely populated wireless LAN environments, the IEEE 802.11 standard's Carrier Sense Multiple Access (CSMA) mechanism leads to decreased transmission efficiency due to increased collisions and exposed terminals, which the IEEE 802.11ax's Inter-BSS spatial reuse techniques insufficiently address.
Innovation Solution
A communication apparatus and method that demodulates the PHY header of received radio frames to identify the radio system and adjust transmission to fit within the Network Allocation Vector (NAV), ensuring TXOP opportunities and improving transmission efficiency by controlling radio frame transmission within the same radio system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If CSMA mechanism is used for radio medium access, then simple access control is achieved, but transmission efficiency decreases due to increased collisions and exposed terminals in dense environments
Solution Approach 1:
The patent applies local quality by differentiating between intra-BSS and inter-BSS transmissions. Within the same BSS (local context), spatial reuse is restricted to maintain collision avoidance, while transmissions to different BSSs (external context) are allowed to proceed simultaneously. This localized differentiation resolves the contradiction by maintaining simple CSMA operation within BSS while enabling efficiency gains from spatial reuse externally.
Solution Approach 2:
The patent segments the radio medium access control into BSS-specific and BSS-independent operations. By identifying whether a transmission is within the same BSS or to a different BSS through PHY header information, the system applies different spatial reuse rules to each segment. This segmentation allows the system to maintain collision avoidance within BSS while exploiting spatial reuse opportunities across BSS boundaries.
2Productivity
If Inter-BSS spatial reuse techniques are employed, then some transmission efficiency improvement is achieved, but TXOP opportunities in dense environments remain insufficient
Solution Approach 1:
The patent merges intra-BSS and inter-BSS spatial reuse mechanisms into a unified approach. By combining the restrictions of intra-BSS spatial reuse with the opportunities of inter-BSS spatial reuse, the system creates a hybrid mechanism that maximizes TXOP opportunities. This merging allows simultaneous transmissions to different BSSs while maintaining collision avoidance within BSS, thereby reducing TXOP opportunity loss in dense environments.
Solution Approach 2:
The patent implements dynamic spatial reuse control based on real-time detection of BSS boundaries through PHY header information. The system dynamically adjusts transmission behavior based on whether the detected transmission is intra-BSS or inter-BSS, allowing flexible adaptation to dense environment conditions. This dynamic approach enables the system to maximize TXOP opportunities by exploiting spatial reuse when safe and avoiding collisions when necessary.
3Productivity
If frame aggregation is used to improve transmission efficiency, then data transmission speed increases, but transmission error probability increases
Solution Approach 1:
The patent introduces spatial reuse as an intermediary mechanism that operates independently from frame aggregation error control. By enabling simultaneous transmissions to different BSSs through spatial reuse, the system creates additional transmission opportunities that reduce the load on individual frame aggregation operations. This intermediary approach allows the system to maintain high transmission speeds through frame aggregation while improving reliability by distributing transmission load across multiple concurrent opportunities.
Data Source
AI summary
A radio communication apparatus that communicates with a base station apparatus and another radio communication apparatus includes a receive circuitry that receives a radio frame, a transmit circuitry that transmits a radio frame, and a control circuitry that controls transmission and/or reception of a radio frame. The receive circuitry receives a radio frame, a PHY header of the received radio frame is demodulated, and in a case that first information, included in the PHY header currently being received, to identify a radio system indicates a radio system where the radio communication apparatus belongs and that a predetermined condition is satisfied, a radio frame is transmitted to fit within NAV of the PHY header currently being received.