RF Domain Identifier for WLAN Interference Management
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Solution Overview
Problem
In device-dense environments, existing wireless local area networks (WLANs) face challenges in providing improved support for mobile services due to inter-tower interference and limitations in deploying cellular phone towers, while WLAN access points have limited range and power, necessitating multiple access points and potential security vulnerabilities with Service Set Identifiers (SSIDs).
Innovation Solution
A wireless access point broadcasts a unique RF domain identifier for each service set, allowing identification and differentiation, and adjusts transmit power based on these identifiers to manage overlapping service sets, prioritizing higher priority services and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple WLAN access points are deployed within a device-dense area, then support for wireless communications is improved, but inter-tower interference increases
Solution Approach 1:
The patent segments the wireless communication spectrum into multiple RF domains by introducing RF domain identifiers. Each access point can operate in multiple RF domains simultaneously, allowing frequency division multiplexing that reduces interference between access points while maintaining high communication support capacity.
2Loss of information
If Service Set Identifiers (SSIDs) are used to identify service sets, then service set identification is achieved, but security vulnerabilities increase
Solution Approach 1:
The patent introduces RF domain identifiers as an intermediary mechanism between access points and client devices for service set identification. These identifiers are transmitted in beacon frames and provide secure, standardized identification without exposing sensitive SSID information, thereby eliminating the security vulnerability associated with SSID broadcasting.
3Object-generated harmful factors
If transmit power is reduced for overlapping service sets, then interference is reduced, but communication range decreases
Solution Approach 1:
The patent implements dynamic transmit power adjustment based on RF domain identifiers received in beacon frames. Access points dynamically modulate their transmit power level for each RF domain independently, reducing power only for overlapping service sets while maintaining full power for non-overlapping services, thereby optimizing the balance between interference reduction and communication range preservation.
Data Source
AI summary
A wireless access point broadcasts a unique RF domain identifier for each supported service set per radio. Within a wireless local area network (“WLAN”) the RF domain identifier is unique for each supported service set, and hence identifies the service set. In addition to identifying the service sets supported by the access point, RF domain identifiers may be used to adjust transmit power in order to differentiate service sets. For example, if a first access point receives a beacon with an RF domain identifier transmitted by a second access point, the transmit power of communications associated with the service set associated with the received RF domain identifier is reduced at the first access point if that service set is also supported on the same radio by the first access point. In one embodiment the first and second access points both reduce transmit power until the beacons are no longer received by the respective nearby access point. The transmit power of communications associated with other service sets and other radios are not effected by the transmit power reduction, i.e., the access point may reduce transmit power of overlapping service set communications while contemporaneously transmitting communications of non-overlapping service sets at full power.