WLAN Measurement Report Frame for TV White Space Spectrum Protection
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Solution Overview
Problem
The challenge in efficiently operating unlicensed devices in TV White Spaces (TVWS) is the need for an effective spectrum sensing mechanism to protect incumbent users, as existing technologies lack a standardized and efficient format for reporting occupied TV channels by primary service signals.
Innovation Solution
A method and apparatus for transmitting and receiving a measurement report frame in a WLAN regulatory domain, which includes a Primary Service Signal Map field indicating occupied TV channels by primary service signals, enabling unlicensed devices to identify and avoid using channels occupied by incumbent users, thereby ensuring efficient operation in TVWS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unlicensed devices use spectrum sensing mechanism to protect incumbent users, then reliability of operation is improved, but device complexity increases due to additional sensing and measurement procedures
Solution Approach 1:
The patent introduces a measurement report frame as an intermediary structure that carries spectrum sensing results. Instead of requiring each unlicensed device to independently perform complex sensing and protection determinations, the measurement report frame serves as a mediator that conveys occupied channel information from one device to another, simplifying the overall system complexity while maintaining protection reliability
Solution Approach 2:
The measurement report frame segments the spectrum sensing information into distinct fields: Primary Service Signal Map field for occupied channels, Secondary Service Signal Map field for other signals, and Measurement Duration field for sensing parameters. This segmentation allows unlicensed devices to process only the relevant portions of the report, reducing computational complexity while ensuring reliable protection
2Measurement precision
If unlicensed devices perform comprehensive spectrum sensing on all channels, then measurement precision is improved, but loss of time increases due to extended sensing duration
Solution Approach 1:
The patent applies partial action by having unlicensed devices perform spectrum sensing only on specific channels where incumbent users are detected, rather than comprehensively sensing all channels. The measurement report frame includes a Primary Service Signal Map field that indicates only the occupied channels, allowing devices to focus sensing resources on relevant channels and reduce overall sensing time while maintaining detection accuracy
Solution Approach 2:
The measurement report frame structure is designed in advance with predefined fields for Primary Service Signal Map, Secondary Service Signal Map, and Measurement Duration. This preliminary structuring allows devices to quickly process sensing results without time-consuming analysis, as the format is predetermined and standardized, reducing the time required to interpret sensing data while maintaining precision
3Reliability
If unlicensed devices lower transmission power when neighboring channels are occupied, then protection of incumbent users is improved, but productivity decreases due to reduced transmission efficiency
Solution Approach 1:
The patent applies local quality by differentiating between channels that are occupied versus channels that are free. The measurement report frame provides channel-by-channel status information, allowing unlicensed devices to lower transmission power only for specific channels where incumbent users are detected, while maintaining full transmission power on other channels. This localized approach ensures protection where needed while preserving overall transmission efficiency
Solution Approach 2:
The measurement report frame provides feedback information about channel occupancy status to unlicensed devices. Based on this feedback, devices can dynamically adjust their transmission power on a per-channel basis. The feedback mechanism allows devices to respond appropriately to spectrum conditions, lowering power only when necessary to protect incumbent users while maintaining high productivity on clear channels
Data Source
AI summary
A method of transmitting and receiving a measurement report frame in a wireless local area network (WLAN) is disclosed. A method of transmitting a measurement report frame form a first station to a second station in a regulatory domain where a licensed device and an unlicensed device are permitted to operate together in a wireless local area network (WLAN) comprising: receiving, at the first station, a measurement request frame from the second station; and transmitting, to the second station, the measurement report frame including a Primary Service Signal Map field indicating which TV channels are occupied by a primary service signal, wherein the primary service signal is a signal that requires protection by regulation.