HE-SIG B Resource Allocation in 802.11ax WLAN
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Solution Overview
Problem
In IEEE 802.11ax, there is a need for efficient and flexible resource allocation methods to support multi-user transmission and wideband frame transmission/reception, especially with the increasing bandwidths of 40 MHz, 80 MHz, and 160 MHz, while minimizing overhead and optimizing resource usage among multiple users.
Innovation Solution
The method involves non-contiguous resource allocation and the use of HE-SIG B field for per-STA control information, allowing for flexible allocation of resources by duplicating resource allocation information across different bandwidths and using bitmaps to indicate allocation units, enabling efficient data transmission resource allocation across multiple users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wideband transmission (40 MHz, 80 MHz, 160 MHz) is implemented to increase transmission capacity, then transmission rate and bandwidth utilization are improved, but overhead increases and resource allocation complexity worsens
Solution Approach 1:
The patent segments the wideband channel into multiple 20 MHz sub-channels, each with independent resource allocation. This allows the system to manage complex wideband transmissions by dividing them into smaller, more manageable units that can be allocated independently to different users, thereby maintaining high transmission rates while reducing allocation complexity.
Solution Approach 2:
The patent introduces a new dimension for resource allocation by using frequency-selective resource unit assignment across different 20 MHz sub-channels. Instead of uniform allocation across the entire wideband, the system allocates resource units independently in each frequency sub-band, adding a frequency-dimension to the allocation process that simplifies management of wideband resources.
2Adaptability or versatility
If resource allocation information is transmitted for each user in wideband scenarios, then resource allocation flexibility is improved, but overhead increases
Solution Approach 1:
The patent merges resource allocation information for multiple users into a single HE-SIG B field transmission. By combining allocation data for multiple users and sub-channels into one unified signaling structure, the system maintains flexible per-user resource allocation while significantly reducing the total overhead compared to separate signaling for each user.
Solution Approach 2:
The patent uses a compact bitmap representation that can be copied and reused across different 20 MHz sub-channels. Instead of transmitting full resource allocation details for each sub-channel, the system transmits a compact allocation pattern that can be applied across multiple sub-channels, reducing overhead while maintaining allocation flexibility.
3Productivity
If non-contiguous resource allocation is implemented to optimize resource usage, then resource utilization efficiency is improved, but allocation complexity and signaling overhead worsen
Solution Approach 1:
The patent implements dynamic resource unit allocation where the size and position of resource units can vary across different 20 MHz sub-channels based on channel conditions and user requirements. This dynamic allocation allows non-contiguous resource assignment that optimizes resource utilization while the systematic bitmap representation keeps the complexity manageable through structured signaling.
Data Source
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AI summary
The present document relates to a method for allocating resources for multi-user or multi-station (STA) data transmission in a wireless LAN system, and an apparatus therefor. To this end, an AP generates a frame including a signaling field and a data field, wherein the signaling field includes a first signaling field (SIG A field) comprising common control information for a plurality of STAs and a second signaling field (SIG B field) comprising individual control information for each of the plurality of STAs, the second signaling field also comprising data transmission resource allocation information for each of the plurality of STAs. The AP transmits the thus generated frame to the plurality of STAs. If the frame is transmitted with a bandwidth of 40 MHz or greater, the second signaling field transmits independent control information in two adjacent 20 MHz bands, and the second signaling field, transmitted through a specific 20 MHz band, comprises data transmission resource allocation information within the specific 20 MHz band.