Wireless LAN Resource Allocation via Segmented SIG B Fields
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Solution Overview
Problem
Current WLAN systems face challenges in efficiently transmitting and receiving resource allocation information for multiple users, particularly in maximizing bandwidth utilization and distributing resource allocation loads across channels.
Innovation Solution
The method involves transmitting resource allocation information in a WLAN system using a frame structure that includes a signaling field with both common and individual control information, allowing for flexible configuration across 20 MHz bands, enabling independent or duplicated control information transmission to efficiently allocate resources across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resource allocation information is transmitted using a unified signaling field structure, then the system complexity is reduced, but the flexibility in allocating resources across different frequency bands is limited
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. Each SIG B field contains resource allocation information tailored to that particular band, enabling independent configuration and allocation strategies for different frequency segments while maintaining overall system organization
Solution Approach 2:
The patent introduces a frequency band dimension to the signaling structure by organizing SIG B fields across multiple 20 MHz bands. This dimensional expansion allows the system to handle resource allocation in a multi-dimensional space (time, frequency, spatial streams) rather than a unified single-dimension approach, thereby increasing versatility without proportionally increasing complexity
2Reliability
If control information is transmitted in every 20 MHz band, then the reliability of resource allocation information is improved, but the overhead and bandwidth consumption increase
Solution Approach 1:
Each 20 MHz band's SIG B field contains control information specifically optimized for that local frequency band's conditions. This local quality approach ensures that control information is tailored to the specific channel characteristics of each band, improving reliability for local allocations while avoiding the need to repeat identical information across all bands, thus controlling overall overhead
3Reliability
If resource allocation information is duplicated across multiple bands, then the robustness against interference is improved, but the bandwidth efficiency decreases
Solution Approach 1:
The patent implements partial duplication where control information is repeated across multiple SIG B fields in different 20 MHz bands, but not fully duplicated across all possible bands. This partial repetition provides redundancy for robustness against interference while limiting the total overhead, achieving a balance between reliability and bandwidth efficiency by applying duplication only where necessary based on allocation needs
Data Source
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AI summary
A method for resource allocation in a wireless LAN system according to an embodiment of the present invention is characterized in that an access point (AP) sends a frame comprising a signaling field and a data field to one or more stations, wherein the signaling field comprises a first signaling field (SIG A field) including first common control information for the one or more stations and a second signaling field (SIG B field) including individual control information for each of the one or more stations, wherein the second signaling field includes resource allocation information for data transmission to the one or more stations, and wherein the resource allocation information comprises resource allocation information for data to be transmitted in a frequency band different from a frequency band in which the second signaling field (SIG B field) is transmitted.