Trigger Frame Sub-Channel NAV for Wi-Fi Spectrum Efficiency
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Solution Overview
Problem
Current Wi-Fi technologies face inefficiencies in spectrum usage due to the limitations of the Network Allocation Vector (NAV) being applied across the entire bandwidth, leading to underutilization of channels, especially in environments with multiple devices and varying bandwidth capabilities.
Innovation Solution
A trigger-based duplicate system that utilizes a new UL PPDU format to include information per 20 MHz channel, allowing clear channel assessment (CCA) and network allocation across all allowed channels, enabling efficient scheduling and data transmission by duplicating the transmission block across the entire bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Network Allocation Vector (NAV) is applied across the entire bandwidth, then channel protection is provided, but spectrum usage efficiency deteriorates leading to underutilization of channels
Solution Approach 1:
The patent segments the bandwidth into multiple 20 MHz sub-channels, each with independent NAV and CCA assessment. Instead of applying a single NAV across the entire bandwidth, the system evaluates and protects each sub-channel independently, allowing devices to transmit on available sub-channels while protecting only those that are currently occupied, thus resolving the contradiction between channel protection and spectrum efficiency.
Solution Approach 2:
The patent implements local quality by applying NAV and protection mechanisms only to specific 20 MHz sub-channels where transmissions are detected, rather than uniformly across the entire bandwidth. This localized approach allows other sub-channels to be utilized freely, improving overall spectrum efficiency while maintaining necessary protection where needed.
2Device complexity
If a single NAV is applied across the entire bandwidth, then simple channel management is achieved, but channel utilization deteriorates in environments with multiple devices
Solution Approach 1:
The patent divides the bandwidth into multiple independently managed 20 MHz segments, each with its own NAV counter and CCA status. This segmentation allows the system to track and manage channel availability at a finer granularity, enabling better utilization in multi-device environments while maintaining manageable complexity through standardized per-segment handling.
Solution Approach 2:
The patent introduces a new dimension of granularity by transitioning from a single bandwidth-wide NAV to multiple sub-channel NAVs. This dimensional change from coarse-grained to fine-grained management enables the system to differentiate between occupied and available portions of the spectrum, significantly improving channel utilization without overwhelming complexity.
3Measurement precision
If clear channel assessment (CCA) is performed on the entire bandwidth, then comprehensive channel availability is determined, but transmission opportunities are lost due to partial bandwidth availability
Solution Approach 1:
The patent segments the bandwidth into multiple 20 MHz CCA domains, allowing independent assessment of each sub-channel's availability. A device can perform CCA on individual sub-channels and transmit on those that are clear, even if other parts of the bandwidth are occupied. This segmented approach maintains measurement precision for each sub-channel while dramatically increasing transmission opportunities by utilizing partially available bandwidth.
4Object-affected harmful factors
If the NAV is set for the entire bandwidth, then interference protection is provided across all channels, but spectrum resource allocation efficiency deteriorates
Solution Approach 1:
The patent applies interference protection locally to only those 20 MHz sub-channels where transmissions are detected and NAV is set. Other sub-channels without active transmissions do not have NAV restrictions, allowing devices to allocate and use those spectrum resources efficiently. This local application of protection maintains interference protection where needed while maximizing spectrum resource allocation efficiency overall.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to trigger based duplicate. A device may generate a variant trigger frame comprising one or more fields to carry information associated with multiple station devices (STAs). The device may include scheduling of a transmission of uplink (UL) trigger based (TB) physical layer (PHY) convergence protocol data unit (PPDU) for the multiple STAs. The device may cause to send the variant trigger frame to the multiple STAs.