U-SIG Preamble Signaling for WLAN Frames Beyond 320 MHz
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Solution Overview
Problem
Existing wireless LAN standards lack mechanisms to efficiently notify the generation of radio frames and supported frequency bandwidths, especially when communication devices support both old and new standards exceeding 320 MHz bandwidth.
Innovation Solution
A communication device is equipped with a Universal Signal Field (U-SIG) in the radio frame preamble to transmit information on the PHY version and bandwidth, allowing for efficient communication across different standards, including those supporting bandwidths greater than 320 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a mechanism is introduced to notify bandwidth greater than 320 MHz in new standards, then communication throughput is improved, but device complexity increases due to supporting multiple standards
Solution Approach 1:
The U-SIG field is designed to serve multiple functions: it identifies the PHY version through the PHY Version Identifier Field and communicates bandwidth information through the Bandwidth Field. This universal field structure allows a single mechanism to handle both legacy standards (with 0 in PHY Version Identifier) and new standards (with specific values greater than 0), enabling devices to support multiple standards without requiring separate notification mechanisms for each standard version.
Solution Approach 2:
The patent uses parameter changes in the U-SIG field to differentiate between standards and bandwidths. By changing the PHY Version Identifier Field value (0 for legacy, specific values greater than 0 for new standards) and the Bandwidth Field value (with 6 indicating greater than 320 MHz), the system can dynamically adapt to different standard versions and bandwidth configurations without increasing fundamental device complexity.
2Adaptability or versatility
If devices support both old and new standards, then adaptability is improved, but information notification efficiency deteriorates due to lack of standardized preamble mechanisms
Solution Approach 1:
The U-SIG field serves as a universal notification mechanism that works across both legacy and new standards. It contains a PHY Version Identifier Field that allows receiving devices to identify which standard version is being used, and a Bandwidth Field that communicates the actual bandwidth being utilized. This universal structure eliminates the need for separate notification mechanisms for different standards, improving information notification efficiency while maintaining adaptability.
Solution Approach 2:
The preamble containing the U-SIG field is transmitted before the actual data transmission, allowing receiving devices to pre-identify the PHY version and bandwidth information. This preliminary action enables devices to prepare appropriate processing routines in advance, improving notification efficiency by providing standard identification and bandwidth information before the main data payload arrives.
3Speed
If bandwidth greater than 320 MHz is used, then communication speed is improved, but compatibility with legacy devices deteriorates
Solution Approach 1:
The patent uses parameter changes in the U-SIG field to indicate bandwidth and standard version. Legacy devices that do not understand the new U-SIG format will still process the preamble according to legacy standards, while new devices can interpret the PHY Version Identifier Field and Bandwidth Field to identify bandwidth greater than 320 MHz. This parameter-based differentiation allows high-speed communication when both devices support it, while maintaining backward compatibility with legacy devices through the standardized field structure.
Data Source
AI summary
A communication device enables transmission of a radio frame in which 0 is specified in a PHY Version Identifier Field of a U-SIG in a preamble, and a radio frame in which 1 is specified in the PHY Version Identifier Field. When the communication device transmits a radio frame in which 1 is stored in the PHY Version Identifier Field and a value greater than 6 is stored in a Bandwidth Field, a transmission means transmits the radio frame using a bandwidth greater than 320 Mhz.