OBSS Wireless Terminal CCA Thresholds for Spatial Reuse
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Solution Overview
Problem
In high-density wireless communication environments with overlapped basic service sets, existing technologies struggle to efficiently manage channel bandwidth and reduce interference among multiple terminals, leading to degraded communication efficiency and reduced transmission opportunities.
Innovation Solution
A wireless communication terminal adjusts transmission power and Clear Channel Assessment (CCA) thresholds based on received signal strength and BSS information, using a processor to decode signaling fields and set Network Allocation Vectors (NAV) to optimize data transmission in overlapping basic service sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminals transmit data simultaneously in high-density environments, then communication throughput increases, but interference among terminals increases and communication reliability degrades
Solution Approach 1:
The patent applies local quality by allowing different CCA thresholds for different BSS types (intra-BSS vs. inter-BSS). Terminals use a first CCA threshold for signals from their own BSS and a second, higher CCA threshold for signals from overlapping BSSs. This enables simultaneous transmission in different BSSs while maintaining reliability within each BSS by selectively ignoring weaker inter-BSS interference.
Solution Approach 2:
The patent changes the CCA threshold parameter based on the source of the detected signal. When a signal is identified as coming from an overlapping BSS (inter-BSS), the terminal uses a higher second CCA threshold, allowing it to ignore weaker interference signals and transmit simultaneously. When the signal is from the same BSS (intra-BSS), the lower first CCA threshold ensures reliable detection and avoidance of collisions.
2Length of stationary object
If transmission power is increased to extend communication distance, then coverage area increases, but interference to other terminals increases and spatial reuse decreases
Solution Approach 1:
The patent implements dynamic transmission power adjustment based on the CCA results. Terminals continuously monitor the wireless medium, detect signals from overlapping BSSs, and adjust their transmission power accordingly. When inter-BSS signals are detected above the second CCA threshold, terminals can reduce power or defer transmission to avoid interference, while still maintaining communication within their own BSS.
3Measurement precision
If CCA threshold is lowered to detect weaker signals, then sensitivity increases and communication range extends, but false detection of inter-BSS signals increases and transmission opportunities are lost
Solution Approach 1:
The patent segments the CCA threshold into two distinct levels: a first CCA threshold for intra-BSS signal detection and a second, higher CCA threshold for inter-BSS signal detection. This segmentation allows terminals to maintain high sensitivity for their own BSS communications while filtering out weaker inter-BSS interference, thereby preventing false detections and preserving transmission opportunities in overlapping BSS environments.
Data Source
AI summary
Provided is a wireless communication terminal that communicates wirelessly. The wireless communication terminal includes: a transceiver; and a processor. The processor receives a first PLCP Protocol Data Unit (PPPU) through the transceiver, and transmits a second PPDU based on Basic Service Set (BSS) information indicated by the first PPDU.