Wi-Fi 7 Bandwidth Puncturing for Multi-BSS Spectrum Sharing
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Solution Overview
Problem
Current Wi-Fi access points inefficiently utilize spectral bandwidth as they allocate an entire 160 MHz channel-width for a single BSS, leading to delayed transmission opportunities for secondary BSSs, necessitating a method for simultaneous sharing of spectral bandwidth between multiple BSSs.
Innovation Solution
Implementing bandwidth puncturing on Wi-Fi 7 access points, where a puncturing pattern is determined and advertised in beacons to allow simultaneous data transmission across multiple BSSs, enabling efficient spectrum sharing between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an entire 160 MHz channel-width is allocated for a single BSS, then the first BSS can achieve full bandwidth utilization, but the second BSS has to wait for its turn to transmit, reducing overall spectral efficiency
Solution Approach 1:
The 160 MHz channel is segmented into multiple sub-channels or frequency portions that can be dynamically assigned to different BSSs. Instead of dedicating the entire channel to one BSS, the channel is divided into smaller units that can be allocated to multiple BSSs simultaneously, allowing parallel transmissions and eliminating waiting turns.
Solution Approach 2:
The channel allocation is made dynamic through puncturing patterns that can change over time. The access point can dynamically adjust which frequency portions are assigned to which BSS based on current traffic conditions, ensuring optimal utilization of the spectrum while allowing multiple BSSs to transmit simultaneously when needed.
2Productivity
If multiple BSSs share the same 160 MHz channel, then spectral efficiency improves, but transmission conflicts and interference increase without proper coordination
Solution Approach 1:
Puncturing patterns are predetermined and advertised in advance through beacon frames. This preliminary action allows all stations to know in advance which frequency portions will be used by which BSS, enabling them to prepare for simultaneous transmissions without conflicts. The coordination is established before actual data transmission begins.
Solution Approach 2:
The access point acts as an intermediary that coordinates transmissions between multiple BSSs. It generates and distributes puncturing patterns that serve as a coordination mechanism, ensuring that multiple BSSs can share the spectrum reliably by preventing simultaneous transmissions on the same frequency portions.
3Productivity
If bandwidth puncturing is implemented for simultaneous BSS transmission, then throughput increases, but system complexity increases due to puncturing pattern management
Solution Approach 1:
The puncturing pattern information is self-advertising through beacon frames. Each access point automatically includes its puncturing pattern in beacons it transmits, and stations automatically extract and use this information. This self-service mechanism eliminates the need for complex centralized coordination or additional signaling overhead, as the system configures itself through the already-existing beacon infrastructure.
Data Source
AI summary
BSS (basic service set) sharing is enabled on the Wi-Fi 7 access point, wherein the Wi-Fi 7 access point is wirelessly connected to a plurality of stations over the common wireless channel. A puncturing pattern is determined to share spectrum of the common wireless channel between the multiple BSSs. All shared BSSs are advertised in beacons with an EHT field comprising the puncturing pattern and broadcast over the common wireless channel. At least two stations of the plurality of stations are connected over at least two different BSSs of the multiple BSSs. Data frames are transmitted simultaneously to the at least two stations across the at least two different BSSs. A first BSS occupies a first portion of a spectrum and a second BSS occupies a second portion of the spectrum, according to the puncturing pattern.