U-SIG and EHT-SIG Field Bit Allocation for Wireless Data Transmission
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Solution Overview
Problem
Existing wireless local area network technologies face challenges in efficiently transmitting data due to limited information-carrying capacity in signaling fields within physical layer protocol data units (PPDUs), particularly in single-user (SU) and multi-user (MU) transmission scenarios.
Innovation Solution
The proposed solution involves generating a PPDU with a universal-Signaling field (U-SIG) and an extremely high throughput-Signaling field (EHT-SIG), where the sum of their information bits is limited to 78 or less, and incorporating identifier indication fields, PPDU format indication fields, and spatial reuse indication fields to enhance information carrying capacity without increasing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the HE-SIG-A and HE-SIG-B fields are used to carry signaling information in PPDU, then the information carrying capacity is limited by the fixed bit quantity of these fields, but the need to support more transmission parameters and scenarios requires more information bits
Solution Approach 1:
The signaling information is divided into two separate fields: U-SIG (Universal Signaling) and EHT-SIG (Extremely High Throughput Signaling). The U-SIG carries common signaling information applicable to all users, while the EHT-SIG carries user-specific signaling information. This segmentation allows the system to efficiently organize and transmit signaling data without exceeding bit limits, as each field has a dedicated purpose and optimized bit allocation.
Solution Approach 2:
The patent introduces a new dimension to the signaling structure by creating a hierarchical relationship between U-SIG and EHT-SIG fields. The U-SIG operates at a higher level carrying universal parameters, while EHT-SIG operates at a lower level carrying specific user parameters. This dimensional organization enables the system to convey more information within the same overall bit budget by utilizing multiple levels of signaling abstraction.
2Adaptability or versatility
If different reception policies are used for SU and MU transmission scenarios, then the reception flexibility is improved, but the receiver complexity increases due to needing to handle two greatly different reception policies
Solution Approach 1:
The U-SIG field is designed with a universal structure that carries common signaling information applicable to both single-user (SU) and multi-user (MU) transmission scenarios. By placing scenario-independent parameters in the U-SIG and scenario-specific parameters in the EHT-SIG, the system achieves multi-functionality where the same PPDU structure can serve different transmission modes without requiring completely different reception policies.
Solution Approach 2:
Different parts of the signaling structure are optimized for different purposes: the U-SIG contains universally applicable parameters with a fixed structure suitable for both SU and MU, while the EHT-SIG contains user-specific parameters that can be dynamically configured. This local optimization allows receivers to efficiently process common information uniformly while handling user-specific information differently, reducing overall receiver complexity.
3Quantity of substance
If the quantity of bits of HE-SIG-A is limited, then the signaling field size is controlled, but the information that can be carried in HE-SIG-A is restricted
Solution Approach 1:
The patent merges the functionality of multiple signaling fields (HE-SIG-A and HE-SIG-B) into a new unified structure consisting of U-SIG and EHT-SIG fields. This merging consolidates the information carrying capacity while maintaining controlled total bit quantity. The U-SIG and EHT-SIG work together to convey both universal and user-specific information, achieving greater overall information capacity within the same bit budget.
Solution Approach 2:
The EHT-SIG field is nested within the PPDU structure alongside the U-SIG field, creating a nested information hierarchy. The U-SIG contains universal parameters that apply to the entire PPDU, while the EHT-SIG contains user-specific parameters that are nested within the same transmission frame. This nesting allows efficient packing of information at different levels of abstraction within the available bit space.
Data Source
AI summary
A network device generates a first physical layer protocol data unit PPDU. The first PPDU includes a first universal-Signaling field U-SIG field and a first extremely high throughput-Signaling field EHT-SIG field, a sum of a quantity of information bits of the first U-SIG field and a quantity of information bits of the first EHT-SIG field is less than or equal to 78 information bits, and at least one of the first U-SIG field and the first EHT-SIG field includes an identifier indication field, where the identifier indication field is used to uniquely identify one station. The network device sends an encoded first PPDU to a station.