VHT Frame Structure for Stable High-Speed Data Transmission
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Solution Overview
Problem
Current communication systems lack a concrete method for transmitting and receiving data in new frequency bands, which hinders stable high-speed data transmission in wireless local area networks (WLANs) and other communication systems.
Innovation Solution
A data transmission apparatus and method that configures a frame in a new frequency band, utilizing verification units to assess the band, generation units to create frames with specific data and control fields, and transmission units to send data through these frames, including VHT-STF, VHT-SIG A1, VHT-SIG A2, and VHT-LTFs, optimizing data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data transmission in a new frequency band is implemented without a concrete frame structure, then frequency band utilization is improved, but transmission stability deteriorates
Solution Approach 1:
The frame structure is segmented into distinct functional fields: VHT-STF for signal detection and automatic gain control, VHT-SIG A1/A2 for control information, VHT-LTFs for channel estimation, and data fields for actual data transmission. This segmentation allows each component to be optimized for its specific function while maintaining overall frame stability in the new frequency band.
Solution Approach 2:
The patent applies parameter changes by defining specific modulation schemes, coding rates, and field structures tailored for the new frequency band. The VHT-SIG A1 and A2 fields carry parameter information that adapts the transmission to the characteristics of the new frequency band, ensuring both adaptability and stability.
2Reliability
If a detailed frame structure with multiple control fields is implemented, then transmission stability is improved, but system complexity increases
Solution Approach 1:
The VHT-SIG A1 and A2 fields serve multiple functions: they carry control information, indicate data field parameters, and provide synchronization information. This multi-functionality reduces the need for separate dedicated fields, maintaining transmission stability while controlling frame structure complexity.
Solution Approach 2:
The VHT-STF and VHT-LTF fields are placed at the beginning of the frame to perform preliminary actions: signal detection, automatic gain control, and channel estimation. By completing these preparatory functions before data transmission, the system ensures stable transmission without requiring complex real-time adjustments during data payload transmission.
3Productivity
If overhead fields are reduced in the frame structure, then data throughput is improved, but control precision deteriorates
Solution Approach 1:
Multiple control functions are merged into the VHT-SIG A1 and A2 fields, which carry both control information and parameter indications. This merging reduces the total overhead compared to having separate dedicated fields for each function, thereby improving data throughput while maintaining sufficient control precision through efficient information packing.
Data Source
AI summary
A data transmission apparatus in a communication system includes a verification unit configured to verify a new frequency band for transmitting and receiving data to and from a plurality of terminals; a generation unit configured to generate a frame in the new frequency band; and a transmission unit configured to transmit data through the new frequency band by using the frame, wherein the frame includes data fields in which data corresponding to the terminals are included, and control fields in which control information for receiving the data included in the data field in the terminals is included, and wherein the control fields include a VHT-STF (very high throughput short training field), a VHT-SIG (very high throughput signal field) A1, a VHT-SIG A2, a plurality of VHT-LTFs (very high throughput long training fields), and a VHT-SIG B.