Mesh WLAN Channelization Management for 802.11n Legacy Coexistence
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Solution Overview
Problem
Current IEEE 802.11s WLAN mesh networks face limitations in integrating IEEE 802.11n high-throughput radios due to differences in channelization modes and legacy radio compatibility, restricting efficient use of 802.11n enhancements.
Innovation Solution
A network management entity (NME) retrieves capability and configuration data from mesh points to configure them for IEEE 802.11n channelization modes (20 MHz, 2×20 MHz, or 40 MHz) and legacy protection modes, ensuring coherent operation across the mesh network, including the use of legacy control frames for protection and dynamic channel management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IEEE 802.11n high-throughput radios are integrated into IEEE 802.11s WLAN mesh networks, then data throughput capability is improved, but compatibility with legacy radio interfaces and coherent operation become problematic
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting channelization mode parameters (20 MHz vs 40 MHz bandwidth, single vs dual radio modes) based on network conditions and device capabilities. The system changes operational parameters to balance high-throughput performance with legacy compatibility, allowing mesh points to adapt between different IEEE 802.11n modes depending on whether legacy devices are present and what bandwidth is actually needed for current traffic loads.
2Productivity
If multiple IEEE 802.11 radio devices are used on a mesh point to increase throughput, then data rate is improved, but device complexity and coordination overhead increase
Solution Approach 1:
The patent implements dynamics by making the radio configuration flexible and adaptive rather than static. Mesh points can dynamically switch between single-radio and multi-radio operational modes, and between 20 MHz and 40 MHz channelization modes, based on real-time network conditions. This dynamic approach allows the system to utilize multiple radios for high throughput when needed while reducing to single-radio operation when complexity overhead is not justified by current performance requirements.
3Productivity
If 40 MHz channel operation is used to increase data rate, then throughput is improved, but coexistence with 20 MHz legacy STAs becomes difficult
Solution Approach 1:
The patent applies periodic action through the Phased Coexistence Operation (PCO) mechanism, where the BSS alternates between 20 MHz and 40 MHz operational phases. During 40 MHz phases, high throughput is achieved for capable devices, while during 20 MHz phases, legacy STA compatibility is maintained. This periodic switching allows the network to periodically provide high-speed access to 802.11n devices while ensuring continuous compatibility with legacy 802.11a/b/g stations.
Data Source
AI summary
High throughput channel operation in a mesh wireless local area network (WLAN) is disclosed. A mesh network comprises a plurality of mesh points and a network management entity (NME). The NME is configured to retrieve capability and configuration data from the mesh points. The NME configures at least one mesh point with respect to IEEE 802.11n channelization and legacy protection mode based on the capability and configuration data.