Wireless Spatial Reuse Adaptation for OBSS Interference
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Solution Overview
Problem
In wireless communication systems, especially in overlapped basic service sets (OBSS) environments, the high probability of collisions due to overlapping transmission areas leads to degradation of signal reception and network performance, as existing IEEE 802.11 standards fail to effectively mitigate inter-BSS interference and hidden node challenges.
Innovation Solution
A wireless communication device and method that adaptively determines an optimal transmission factor for spatial reuse (SR) communication by transmitting test signals with varying factors, adjusting transmission periods, and using delayed acknowledgment policies to minimize collisions and optimize data transmission in overlapping areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple terminals and APs overlap coexist in OBSS environment to expand service area, then service coverage is improved, but collision probability increases and network performance degrades
Solution Approach 1:
The patent implements dynamic adjustment of transmission parameters including power level and spatial reuse (SR) factors based on real-time channel conditions and interference levels. The system continuously adapts transmission characteristics to maintain reliable communication while maximizing spatial reuse, allowing multiple APs to coexist efficiently in overlapping service areas without causing excessive interference.
Solution Approach 2:
The system changes physical transmission parameters such as power spectral density, modulation schemes, and SR factors to optimize performance in OBSS environments. By dynamically adjusting these parameters based on detected interference conditions, the system resolves the contradiction between expanding coverage and maintaining network performance.
2Reliability
If transmission power is increased to improve signal reception in overlapping areas, then reception quality is improved, but interference to other BSS increases
Solution Approach 1:
The patent applies different transmission power levels and SR factors to different spatial regions and user scenarios. Instead of uniform high power transmission, the system locally adapts power levels based on detected interference conditions, receiver location, and channel quality, thereby improving reception where needed while minimizing interference to other BSS in different spatial zones.
Solution Approach 2:
The system employs feedback mechanisms where receiving devices report channel conditions, interference levels, and acknowledgment status to transmitting devices. This feedback enables dynamic adjustment of transmission power and SR factors, allowing the system to increase power only when necessary for reception quality while automatically reducing power when interference becomes problematic.
3Productivity
If spatial reuse factor is increased to improve throughput in OBSS, then data transmission efficiency is improved, but collision probability increases
Solution Approach 1:
The system dynamically adjusts the spatial reuse factor based on real-time detection of ongoing transmissions and channel conditions. When the system detects low interference levels, it increases the SR factor to maximize throughput. When collisions or interference are detected, it reduces the SR factor to maintain transmission reliability, thereby dynamically balancing throughput and reliability.
Solution Approach 2:
The patent implements self-service mechanisms where devices autonomously adjust their SR factors based on locally detected channel conditions without requiring centralized control. Each device monitors its own transmission success rate and interference levels, then self-adjusts its SR factor to optimize the balance between throughput and reliability for its specific local conditions.
Data Source
AI summary
Provided is a wireless communication device including at least one processor configured to transmit a plurality of test signals generated based on different transmission factors to a reception device, and transmit first data to the reception device based on a transmission factor of a first test signal among the plurality of test signals in response to determining a first acknowledgement signal has been received, the first acknowledgement signal corresponding to the first test signal, the transmission of the first data being via a wireless data channel while second data is contemporaneously transmitted via the wireless data channel by another device.