White Space Channel Validity Map ID Comparison
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Solution Overview
Problem
In wireless systems, unlicensed devices operating in white space bands face challenges in efficiently determining whether available channels have changed, leading to potential interference with licensed devices and increased operational burdens due to frequent spectrum sensing and database access.
Innovation Solution
A method where a first station receives a message indicating the validity of available channel information from a second station, using a Map ID to compare and determine if the channel information has been updated, and requests new information when it is invalid, allowing efficient detection of changes in available channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an unlicensed device performs frequent spectrum sensing to determine available channels, then the reliability of channel availability determination is improved, but the operational burden and time consumption increase
Solution Approach 1:
The patent applies preliminary action by having the second STA pre-determine and store available channel information along with a Map ID before the first STA needs to perform spectrum sensing. When the first STA wants to determine channel availability, it simply compares its existing Map ID with the received Map ID in the message. If they match, the channel information is still valid without needing to perform time-consuming spectrum sensing, thus resolving the contradiction between reliability and time consumption.
2Measurement precision
If an unlicensed device accesses the geolocation Database frequently to obtain available channel information, then the accuracy of channel information is improved, but the operational burden and processing time increase
Solution Approach 1:
The patent applies copying by having the second STA copy and transmit the available channel information and Map ID to the first STA through a message. The first STA stores this copied information locally and uses it for comparison instead of accessing the geolocation Database repeatedly. This reduces the operational burden and processing time while maintaining information accuracy, as the copied data reflects the current valid channel information from the database.
3Speed
If an unlicensed device stores detailed available channel information locally, then the speed of determining channel availability is improved, but the memory requirements and information management complexity increase
Solution Approach 1:
The patent applies taking out by extracting only the essential Map ID from the complete available channel information and storing it locally in the first STA. The full channel information is kept at the second STA or in the geolocation Database. When channel availability needs to be determined, only the compact Map ID is compared, not the entire channel information set. This reduces memory requirements and simplifies information management while maintaining fast detection speed through simple ID comparison.
Data Source
AI summary
A method and apparatus for operating within a white space band using a message indicating whether an available channel information is valid in the wireless system are disclosed. In a method for a first station (STA) to operate as an unlicensed device which is permitted to operate on an available channel within a White Space (WS) band of a wireless system, comprises: receiving a message indicating whether an available channel information of the first STA is valid from a second STA, wherein the available channel is a channel not used by a licensed device, wherein the message includes a Map ID of a current valid available channel information; and determining whether an existing available channel information of the first STA is valid by comparing a Map ID of the existing available channel information of the first STA with the Map ID included in the received message.