TV White Space Measurement Pilot Frame for Fast Channel Scanning
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Solution Overview
Problem
The challenge in TV white space communication is the high channel access delay and complexity in finding available bandwidth due to variable bandwidths and center frequencies, along with the need for channel permissioning and regulatory controls, which complicates the operation of unlicensed 802.11 devices.
Innovation Solution
The solution involves using a 5 MHz Measurement Pilot Frame for fast passive scanning, multi-band dynamic station enablement through new information frames, and enhanced station identification to reduce scanning time and enable permission across multiple bands, while improving interference detection within the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional channel scanning methods are used in TV white space, then complete spectrum detection is achieved, but channel access delay increases and scanning time becomes large
Solution Approach 1:
The patent segments the spectrum detection process by introducing a dedicated 5 MHz Measurement Pilot Frame within the TV white space channel. This pilot frame contains spectrum availability information that devices can quickly scan without needing to perform exhaustive wideband scanning, thus reducing channel access delay while maintaining detection accuracy through the structured segmentation of spectral information.
Solution Approach 2:
The patent implements preliminary action by having enabling devices pre-populate the 5 MHz Measurement Pilot Frame with spectrum availability information before other devices attempt to access the channel. This advance preparation allows receiving devices to make rapid channel access decisions based on pre-computed spectral data, eliminating the need for time-consuming real-time spectrum analysis.
2Adaptability or versatility
If variable bandwidths and center frequencies are used in TV white space, then spectrum flexibility is improved, but complexity in finding available bandwidth increases
Solution Approach 1:
The patent introduces the 5 MHz Measurement Pilot Frame as an intermediary that carries standardized spectrum availability information. This pilot frame acts as a mediator between the variable TV white space channels and devices seeking to access them, providing a consistent reference point that simplifies the complexity of finding available bandwidth across variable channel configurations.
Solution Approach 2:
The patent changes the parameter of the measurement frame bandwidth to a fixed 5 MHz width, regardless of the variable TV white space channel bandwidths. This parameter standardization simplifies the device complexity by providing a consistent measurement reference, while the pilot frame's content adapts to reflect the actual variable spectrum availability in different TV white space channels.
3Productivity
If unlicensed 802.11 devices operate in TV white space, then spectrum utilization is improved, but channel permissioning and regulatory controls complicate operation
Solution Approach 1:
The patent implements self-service by enabling unlicensed 802.11 devices to autonomously determine channel permission status through the 5 MHz Measurement Pilot Frame. The pilot frame contains regulatory and permissioning information that allows devices to self-configure and self-regulate their operation in TV white space channels without complex external control mechanisms, thus improving spectrum utilization while reducing operational complexity.
Data Source
AI summary
Methods and apparatus for access, enablement and control of devices in TV white space are provided. Methods and apparatus for channel scanning by a device are provided that shorten channel scanning time by using a 5 MHz Measurement Pilot frame at a predetermined location within an enabling device's channel, regardless of the operating bandwidth of the enabling device. Also provided are methods and apparatus for multi-band dynamic station enablement that locate information regarding an enabling device's supported regulatory classes and channel numbers within one accessible frame of information and also provide request and response messages to arrange for enablement of a requesting device on a network. Further, methods and apparatus are provided for identifying an interfering device on a network by providing increased information from within a DSE Registered Location element.