Wireless Frame Signaling Field Segmentation for Bandwidth Control
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Solution Overview
Problem
Current wireless LAN systems face challenges in effectively transmitting and receiving data using an efficient wireless frame structure, particularly in managing signaling fields and control information across multiple bandwidths, which affects signal flexibility and decoding efficiency.
Innovation Solution
The method involves generating a radio frame with a signaling field comprising a first common control field and a second individual control field, where the second field is configured to transmit independent control information for each station across 20 MHz bands, and encoding information is grouped based on modulation and coding schemes to optimize transmission in various bandwidths, including 40 MHz and 80 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single signaling field is used to transmit control information across the entire bandwidth, then the frame structure is simple, but the system cannot provide independent control information for different bandwidth segments (20 MHz bands)
Solution Approach 1:
The signaling field is divided into multiple SIG B fields, with each SIG B field corresponding to a specific 20 MHz band. This segmentation allows independent control information to be transmitted for each bandwidth segment while maintaining a structured and manageable frame format. Each SIG B field contains control information specific to its associated 20 MHz band, enabling flexible bandwidth allocation and control.
2Productivity
If control information is transmitted independently for each 20 MHz band, then bandwidth flexibility is improved, but signaling overhead increases
Solution Approach 1:
Multiple SIG B fields containing control information for different 20 MHz bands are merged into a single aggregated SIG B field within the frame structure. This merging approach allows the system to maintain independent control information for each bandwidth segment while reducing overall signaling overhead by consolidating the control fields rather than transmitting them as separate entities.
3Manufacturing precision
If padding bits are added for time domain alignment in each 20 MHz band, then decoding synchronization is improved, but frame length increases
Solution Approach 1:
Padding bits are selectively added only to specific SIG B fields that require time domain alignment, rather than uniformly adding padding to all signaling fields. This local approach ensures decoding synchronization for bands that need it while minimizing the overall increase in frame length. The padding is applied locally where necessary to maintain synchronization without unnecessarily extending the entire frame.
Data Source
AI summary
According to one embodiment of the present invention, an AP generates a frame including a signaling field and a data field so as to transmit the frame to one or more STAs, wherein: the signaling field includes a first signaling field having first common control information on the one or more STAs, and a second signaling field having individual control information for each of the one or more STAs; and the second signaling field includes a common field having second common control information on the one or more STAs, and individual fields having individual control information for each of the one or more STAs. In addition, if the frame is transmitted with a bandwidth of 40 MHz or more, the second signaling field transmits independent control information in two adjacent 20 MHz bands.