Dynamic Station Enablement in TV White Space Networks
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Solution Overview
Problem
In wireless local area networks (WLAN) operating in TV White Space, unlicensed devices face inefficiencies in determining available channels and protecting incumbent users, leading to high overhead and potential interference.
Innovation Solution
Classifying devices into enabling and dependent stations, where the enabling station determines available channels using geographic location and a regulatory database, and the dependent station receives this information to operate within TV White Space, with the enabling station transmitting a DSE Link identifier element including its MAC address to facilitate efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unlicensed devices perform spectrum sensing to determine available channels, then channel availability is detected, but signaling overhead increases and operation efficiency decreases
Solution Approach 1:
The patent introduces an enabling station as an intermediary that performs spectrum sensing and regulatory database queries on behalf of dependent stations. The enabling station determines available channels and transmits this information to dependent stations, eliminating the need for each station to independently perform spectrum sensing, thereby reducing overall system overhead while maintaining reliable channel availability detection.
2Ease of operation
If dependent station receives enabling signal from dependent AP, then operation is enabled, but the dependent station cannot know the address of enabling station
Solution Approach 1:
The patent applies preliminary action by having the dependent AP include the enabling station's address information in advance within the enabling signal transmission. This preliminary inclusion of address information allows the dependent station to know the enabling station's address before needing to communicate with it, resolving the information loss problem while maintaining ease of operation.
3Object-affected harmful factors
If unlicensed device uses spectrum sensing mechanism, then protection for incumbent user is provided, but transmission power must be lowered when neighboring channel is used by incumbent user
Solution Approach 1:
The patent applies preliminary action by having the enabling station perform regulatory database queries and determine available channels before unlicensed devices begin transmission. This preliminary determination of safe channels based on regulatory information about incumbent user locations allows devices to operate at optimal power levels without causing interference, rather than having to continuously lower power when neighboring channels are used.
Data Source
AI summary
A method and an apparatus for Dynamic Station Enablement (DSE) procedure in a wireless local area network system are disclosed. For a method of enabling a dependent station to operate within a white space as an unlicensed device by an enabling station, the method comprises: transmitting, from the enabling station to the dependent station, an enabling signal to permit the dependent station to operate within a TV white space; transmitting, from the enabling station to the dependent station, a white space map element which indicates an available channel list in the TV white space such that the dependent station operates only within the available channels identified by the white space map element, wherein the white space map element is transmitted via one of a beacon frame, a probe response frame and a white space map announcement frame; and exchanging a DSE (dynamic station enablement) related message between the enabling station and the dependent station on one or more of the available channels identified by the white space map element.