Wireless Network Throughput Optimization via Channel Segregation
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Solution Overview
Problem
Mixed modulation type wireless networks, such as those employing 802.11b and 802.11g standards, experience throughput degradation due to compatibility issues like collisions and suboptimal data rates when both types of devices coexist, with 802.11b-only devices unable to detect 802.11g OFDM signals and 802.11g-capable devices not utilizing their higher data rates when connected to 802.11b access points.
Innovation Solution
Segregating 802.11b and 802.11g traffic into different frequency channels and using network management tools to configure access points to operate in modes that either exclusively use, prefer, or discourage specific physical layer standards, preventing or discouraging communication based on the standard type to optimize channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 802.11g protection mode is used to prevent collisions with 802.11b devices, then collision prevention is improved, but network throughput deteriorates due to increased overhead
Solution Approach 1:
The patent segments the wireless network into separate 802.11b-only cells and 802.11g-capable cells based on client device types. Access points are configured to operate in specific modes (b-only, g-only, or mixed) to create distinct network segments. This segmentation eliminates the need for protection mode overhead in pure 802.11g cells while maintaining collision prevention in mixed environments.
2Adaptability or versatility
If 802.11g-capable clients associate with 802.11b access points, then connectivity is improved, but data rate deteriorates to 11 Mbps instead of 54 Mbps
Solution Approach 1:
The patent applies local quality by configuring specific access points with specific operational modes based on their location and client composition. 802.11g-capable clients are directed to associate with access points operating in g-only or g-preferred mode, where they can achieve 54 Mbps data rates. This localized configuration ensures each client connects to the most appropriate access point for its capabilities.
3Area of stationary object
If mixed 802.11b and 802.11g clients operate on the same channel, then network coverage is improved, but throughput deteriorates due to compatibility issues
Solution Approach 1:
The patent resolves the contradiction by transitioning from a single-channel mixed-mode operation to a multi-channel segregated operation. Different frequency channels are assigned to different access point modes (b-only, g-only, mixed), effectively adding a frequency dimension to the network architecture. This allows simultaneous operation of different client types across multiple channels without mutual interference, achieving both broad coverage and high throughput.
Data Source
AI summary
Significant improvements in throughput of networks employing disparate physical layer standards are provided. Different physical layer standards are segregated into different frequency channels. In one implementation, 802.11b traffic and 802.11g traffic are segregated into different frequency channels. A network management tool allows the user to specify channels to either, e.g., 802.11b-only, 802.11g-only, 802.11b preferred and 802.11g discouraged, or 802.11g preferred and 802.11b discouraged. Access points are given the capability of preventing or discouraging client traffic of either given type.