TVHT Operation Field for Whitespace Band Channelization
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Solution Overview
Problem
In wireless communication systems, especially in the whitespace band, unlicensed devices face challenges in efficiently setting channels to avoid interfering with licensed devices, requiring frequent geo-location database access and spectrum sensing to ensure channel availability and protect incumbent users.
Innovation Solution
A method for transmitting and receiving whitespace operation information, including a TVHT operation information field with primary channel number, channel width, and channel center frequency segments, allowing stations to determine and set channel frequencies based on TV channel indices, ensuring correct and efficient channelization for WLAN operation in the whitespace band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unlicensed devices perform frequent spectrum sensing and geo-location database access to protect licensed devices, then reliability of licensed device protection is improved, but device complexity and time consumption increase
Solution Approach 1:
The patent introduces a standardized operation information field as an intermediary mechanism that consolidates channel availability data from spectrum sensing and geo-location database operations. This field acts as a mediator between the complex sensing mechanisms and the actual channel selection process, simplifying the overall system architecture while maintaining protection reliability.
Solution Approach 2:
The patent implements preliminary channel determination by encoding operation information fields that pre-contain channel availability data before transmission. Devices perform spectrum sensing and database access in advance, storing results in standardized fields that guide subsequent channel selection without requiring repeated sensing operations, thereby reducing time consumption and complexity.
2Measurement precision
If unlicensed devices access geo-location database frequently to determine available channels, then channel availability accuracy is improved, but time consumption and loss of time increase
Solution Approach 1:
The patent performs geo-location database access and spectrum sensing operations in advance, storing channel availability information in standardized operation information fields before actual communication needs arise. This preliminary action ensures high accuracy of channel availability data while avoiding repeated database access delays during critical communication moments.
Solution Approach 2:
The patent creates standardized operation information field structures that copy and consolidate channel availability data from multiple sources (spectrum sensing results, geo-location database entries). This copying mechanism allows devices to reference pre-processed information rather than repeatedly accessing original data sources, reducing time loss while maintaining accuracy.
3Ease of operation
If unlicensed devices use standardized operation information fields for channel determination, then ease of operation is improved, but device complexity increases due to standardized framework requirements
Solution Approach 1:
The patent creates a universal operation information field structure that serves multiple functions: encoding channel availability, transmission parameters, and protection requirements in a single standardized format. This multi-functional field simplifies the channel determination process for devices while providing a comprehensive framework that handles various operational scenarios through a unified mechanism.
Solution Approach 2:
The patent transforms complex channel determination parameters into standardized field formats with defined structures and encoding schemes. By changing the representation of channel information into uniform parameters that fit standardized field structures, the system improves ease of operation through consistent formatting while the standardization itself introduces framework complexity.
Data Source
AI summary
A wireless communication system is disclosed. Specifically, a channelization method in a whitespace band and an apparatus for the same are disclosed. A method for providing whitespace operation information includes transmitting, by a first station (STA) to a second STA, a frame including a TV whitespace high throughput (TVHT) operation information field. The TVHT operation information field includes primary channel number, channel width, channel center frequency segment 0 and channel center frequency segment 1 subfields. A channel center frequency of frequency segment 0 or frequency segment 1 is determined based on a channel start frequency. The channel start frequency is determined as a function of a TV channel index corresponding to the frequency segment 0 or a TV channel index corresponding to the frequency segment 1.