White Space Map Channel Query for WLAN Location Updates
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Solution Overview
Problem
In wireless local area networks (WLANs), unlicensed devices operating in whitespace bands face challenges in efficiently querying channel availability across multiple locations, requiring frequent updates when moving, which disrupts continuous operation.
Innovation Solution
A method and apparatus for performing channel availability queries on multiple locations by using a White Space Map (WSM) that signals available channels and maximum transmit power levels, allowing unlicensed devices to operate within a whitespace zone defined by a specific geographical area, eliminating the need for continuous updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an STA updates available channel information when moving, then the channel information remains accurate for the current location, but the continuous operation is disrupted and network efficiency decreases
Solution Approach 1:
The patent applies preliminary action by having the STA query channel availability for multiple locations in advance before moving. The system performs channel availability queries for a plurality of locations ahead of time, storing channel information for multiple potential locations. When the STA moves to a new location, it can immediately use the pre-acquired channel information without interruption, thus maintaining both accuracy and continuity.
2Productivity
If an STA queries channel availability for multiple locations in advance, then the network operation continuity is maintained when moving, but the query complexity and data processing load increase
Solution Approach 1:
The patent applies segmentation by dividing the channel availability query into manageable components. Instead of querying all possible locations simultaneously, the system segments the query process to handle multiple locations through structured message exchanges. The channel availability query message is designed to efficiently request information for multiple locations, and the response is segmented into location-specific channel availability data, reducing overall system complexity while maintaining continuity.
3Measurement precision
If channel availability information is updated frequently to maintain accuracy, then the channel information remains current, but the energy consumption and network overhead increase
Solution Approach 1:
The patent applies periodic action by implementing channel availability queries at strategic intervals rather than continuously. The system performs queries periodically or event-driven (when moving between locations) rather than maintaining constant updates. This periodic approach ensures channel information remains current for each location while significantly reducing energy consumption and network overhead compared to continuous monitoring.
Data Source
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AI summary
The present invention relates to a method and apparatus for channel availability query on multiple locations in a wireless local area network system. A method for a station (STA) to perform a channel query procedure in a wireless communication system comprises: transmitting, at a first STA corresponding to a channel availability query requesting STA, a first message to a second STA supporting the channel availability query procedure, wherein the second STA corresponds to a channel availability query responding STA, wherein the first message comprises device location information of one or more locations for the channel availability query; and receiving, at the first STA from the second STA, a second message comprising channel availability information, wherein the channel availability information is commonly applicable to multiple locations within an area, when the device location information of the first message is for the multiple location within the area.