Wireless Terminal CCA Control for Overlapping BSS 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 utilize bandwidth by simultaneously transmitting data between multiple terminals and base stations due to interference and contention for channel access.
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 (NAVs) to optimize data transmission in overlapping basic service sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminals and base stations transmit data simultaneously in high-density wireless environments, then bandwidth utilization improves, but interference and channel access contention increase
Solution Approach 1:
The patent segments the wireless communication system into multiple Basic Service Sets (BSSs) with unique BSS colors. Each BSS is treated as an independent segment that can operate autonomously, allowing simultaneous transmissions in different BSSs without interference. This segmentation enables spatial reuse of the wireless medium while maintaining organized channel access control.
Solution Approach 2:
The patent introduces a new dimension for channel access by using BSS color codes in the physical layer. Instead of traditional single-dimensional channel contention, the system now operates in a multi-dimensional space where transmissions are identified and managed by their BSS color, enabling simultaneous transmissions across different BSSs in the same frequency band.
2Productivity
If traditional CCA thresholds are used in overlapped BSS environments, then channel access control is simple, but spatial reuse is limited and communication efficiency decreases
Solution Approach 1:
The patent applies different CCA threshold values locally to different BSS scenarios. Instead of using a single global threshold, the system dynamically adjusts CCA thresholds based on the received BSS color and signal strength. This local differentiation allows aggressive spatial reuse in some BSSs while maintaining conservative access control in others, optimizing overall communication efficiency.
Solution Approach 2:
The CCA threshold is transformed from a static parameter to a dynamic one that changes based on real-time conditions. The system continuously monitors received signal strength and BSS color information, then adjusts the CCA threshold accordingly. This dynamic adjustment enables the system to adapt to varying interference conditions and maximize spatial reuse opportunities.
3Productivity
If BSS color coding is implemented for spatial reuse, then simultaneous transmission capability increases, but processing complexity and signaling overhead increase
Solution Approach 1:
The BSS color code is embedded in the preamble of each transmission frame, allowing receiving devices to identify the BSS color before full frame processing. This preliminary identification enables early decisions about whether to apply spatial reuse rules, reducing overall processing complexity by avoiding detailed analysis of frames from other BSSs.
Solution Approach 2:
The patent uses BSS color coding as a form of signal identification, where different BSSs are assigned unique color codes. This color-based identification system simplifies the processing complexity by providing an intuitive and efficient method for distinguishing between different BSSs, enabling rapid spatial reuse decisions without complex signaling overhead.
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.