PPDU User-Field Extension to Reduce Multi-MCS Signaling Overhead
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Solution Overview
Problem
Existing Wi-Fi communication systems face inefficiencies in data transmission due to high overheads in signaling fields used to indicate multiple modulation and coding schemes (MCSs) for spatial streams, leading to reduced data transmission efficiency.
Innovation Solution
A communication method and apparatus that reduces signaling overheads by incorporating a second user field in the PPDU to indicate multiple MCSs for spatial streams or resource units, allowing grouping of streams or units with similar signal-to-noise ratios into a single MCS indication, thereby optimizing the signaling format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional user field design is used to indicate multiple MCSs for spatial streams, then each spatial stream requires a separate user field, but this increases signaling overheads and reduces transmission efficiency
Solution Approach 1:
The patent merges multiple user fields into a single unified user field structure. Instead of allocating separate user fields for each spatial stream's MCS indication, the invention combines all MCS indications into one shared user field, thereby reducing the total number of user fields and signaling overheads while maintaining the ability to indicate multiple MCSs for multiple spatial streams
Solution Approach 2:
The unified user field is designed to serve multiple functions simultaneously: it can indicate MCS for multiple spatial streams, support different resource unit allocations, and accommodate varying numbers of spatial streams. This multi-functional design eliminates the need for separate dedicated fields for each function, reducing overall signaling overhead
2Measurement precision
If separate user fields are allocated for each spatial stream's MCS indication, then each stream can be independently indicated, but this increases the complexity of the signaling field structure
Solution Approach 1:
Multiple MCS indication functions are merged into a single user field structure. The unified user field contains multiple MCS indication elements that can simultaneously represent different MCS values for different spatial streams, reducing structural complexity while preserving precise indication capabilities
Solution Approach 2:
The user field structure is transformed from multiple separate fields to a single field with variable parameters. The unified user field can dynamically adapt its internal structure to indicate different numbers of MCSs based on the actual number of spatial streams, providing both precision and flexibility without increasing complexity
Data Source
AI summary
The method includes: receiving a PPDU from a first communication apparatus, where a signaling field of the PPDU includes a first user field and a second user field, the first user field includes a user identifier, the user identifier matches a user identifier of a second communication apparatus, the second user field includes a first sequence and indication information of a plurality of MCSs of the second communication apparatus, and the first sequence indicates that the second user field is extension of the first user field; and demodulating, based on the first user field and the second user field, data carried in the PPDU. In embodiments of the present disclosure, the second user field includes the indication information of the plurality of MCSs of the second communication apparatus, so that signaling overheads in the PPDU can be reduced, and transmission efficiency of data information can be improved.