Spatial Reuse in Wireless Networks via Dynamic CCA Thresholds
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Solution Overview
Problem
Current IEEE 802.11 WLANs face inefficiencies in spatial reuse due to conservative parameter settings, leading to suboptimal transmission power adjustments and increased system overhead.
Innovation Solution
A device and method for spatial reuse that dynamically adjust transmission power and clear channel assessment (CCA) thresholds based on the density of nearby access points (APs), allowing for concurrent transmissions while minimizing system overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative parameter settings are used in current DCF schemes, then transmission reliability is maintained, but spatial utilization efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the CCA threshold adjustable rather than fixed. The threshold is dynamically adapted based on the density of nearby access points, allowing the system to transition between conservative and aggressive transmission strategies. This resolves the contradiction by enabling high reliability when AP density is low and high spatial efficiency when AP density is high
Solution Approach 2:
The patent changes the parameter of CCA threshold from a fixed value to a variable that depends on AP density. By calculating optimal CCA thresholds based on the number and distribution of nearby APs, the system can optimize both transmission reliability and spatial utilization efficiency simultaneously, rather than being constrained by conservative fixed parameters
2Productivity
If CSR technique coordinates between APs to regulate transmission power, then spatial transmission performance is improved, but system overhead increases
Solution Approach 1:
The patent applies self-service by enabling each AP to independently calculate and determine its own optimal transmission power and CCA threshold based on locally available information about nearby APs. This eliminates the need for complex coordination protocols and control frame exchanges between APs, thereby improving spatial transmission performance while minimizing system overhead
Solution Approach 2:
The patent extracts the coordination function from the system level to the individual AP level. Instead of requiring centralized coordination or mutual negotiation between APs, each AP independently determines its transmission parameters based on its own observation of the environment, thereby removing the overhead associated with inter-AP coordination
3Productivity
If OBSS level is adjusted between boundary values in IEEE 802.11ax, then spatial reuse is enabled, but transmission success rate deteriorates
Solution Approach 1:
The patent changes the OBSS PD parameter from a fixed boundary value to a dynamically calculated value based on AP density. By calculating the optimal CCA threshold considering the actual density and distribution of nearby APs, the system enables spatial reuse while maintaining transmission success rate, rather than using conservative fixed boundary values that degrade performance
Data Source
AI summary
Provided are a device and method for spatial reuse in a wireless network. According to the device and method for spatial reuse, concurrent transmission power is calculated that is a power for transmitting a signal concurrently with an occupant transmission node, which is occupying a channel and transmitting a signal with reference transmission power, on the basis of a density of nearby access points (APs), a clear channel assessment (CCA) threshold is adjusted and set in accordance with the concurrent transmission power, and whether to perform concurrent transmission is determined in accordance with the CCA threshold and an intensity of the signal transmitted by the occupant transmission node. Accordingly, it is possible to efficiently reuse space.