HE-SIG-A Field Encoding for WLAN Multi-User Resource Allocation
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Solution Overview
Problem
Current WLAN technologies face limitations in supporting multi-user transmissions, particularly in efficiently allocating resources and conveying necessary information across multiple stations, which affects throughput and performance in dense environments.
Innovation Solution
The proposed solution involves generating and processing Physical Layer Convergence Procedure (PLCP) Protocol Data Units (PPDUs) that include legacy and high-efficiency preambles, with specific fields like HE-SIG-A and HE-SIG-B providing information on resource allocation, modulation, and coding schemes, allowing each station to identify its allocated resources and decode signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-user transmission is implemented in WLAN, then throughput and performance in dense environments are improved, but resource allocation complexity and information signaling overhead increase
Solution Approach 1:
The patent segments the resource allocation information into two distinct fields: HE-SIG-A field containing common information for all stations (such as resource allocation type, bandwidth), and HE-SIG-B field containing user-specific information (such as resource unit assignment, modulation and coding scheme). This segmentation allows efficient multi-user transmission by distributing information appropriately while reducing overall signaling overhead.
2Productivity
If resource allocation information is provided to multiple stations, then multi-user transmission efficiency is improved, but information signaling overhead increases
Solution Approach 1:
The patent merges common resource allocation information into the HE-SIG-A field that is transmitted once for all stations, while user-specific information is placed in the HE-SIG-B field. This combining approach reduces redundant information transmission compared to providing separate signaling for each station, thereby reducing overall information signaling overhead while maintaining multi-user transmission efficiency.
3Measurement precision
If HE-SIG-B field contains detailed resource allocation information, then station resource identification accuracy is improved, but signal decoding complexity increases
Solution Approach 1:
The patent implements preliminary action by first transmitting common information in the HE-SIG-A field that enables stations to prepare for decoding. Stations use this advance information to configure their decoding parameters before receiving the detailed user-specific information in HE-SIG-B, thereby reducing the actual decoding complexity while maintaining accurate resource identification.
Data Source
AI summary
Disclosed are multi-user transmission methods in a wireless local access network (WLAN). An operation method performed in a first station may comprise generating a physical layer convergence procedure (PLCP) protocol data unit (PPDU) including a legacy preamble, a high efficiency (HE) preamble, and a payload; and transmitting the PPDU. Also, the HE preamble may include a HE signal A (HE-SIG-A) field, a HE signal B (HE-SIG-B) field, a HE short training field (HE-STF), and a HE long training field (HE-LTF), and the HE-SIG-A field may include information indicating the number of symbols of the HE-SIG-B field. Accordingly, a performance of the WLAN may be enhanced.