PPDU Modulation Signaling for Non-Uniform Spatial Streams
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Solution Overview
Problem
Existing wireless local area network (WLAN) standards face challenges in efficiently indicating non-uniform modulation schemes for multiple spatial streams, leading to inefficiencies in throughput and complexity in protocol implementation.
Innovation Solution
A communication method and apparatus that use a small number of bits to indicate different modulation schemes, specifically using a physical protocol data unit (PPDU) with first indication information to differentiate between modulation schemes, ensuring a limited difference in modulation bits and supporting non-uniform modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a small number of bits is used to indicate modulation schemes, then bit overhead is reduced, but the ability to indicate diverse non-uniform modulation schemes is limited
Solution Approach 1:
The indication of modulation schemes is segmented into two parts: a first indication information field indicating a first modulation scheme, and a second indication information field indicating a second modulation scheme. This segmentation allows efficient use of bits while supporting diverse non-uniform modulation schemes by dividing the indication task into manageable parts.
Solution Approach 2:
The patent introduces a differential indication approach where instead of indicating each modulation scheme independently, it uses a differential value to indicate the difference between modulation schemes. This dimensional change from absolute indication to relative indication reduces bit overhead while maintaining versatility.
2Adaptability or versatility
If diverse modulation schemes are supported for multiple spatial streams, then non-uniform modulation capability is improved, but protocol complexity increases
Solution Approach 1:
The patent applies local quality by allowing different modulation schemes to be indicated for different spatial streams through separate indication fields. Each spatial stream can have its own modulation scheme indication, enabling non-uniform modulation while keeping the protocol structure organized and manageable through localized indication rather than global complexity.
3Ease of manufacture
If the difference between modulation bits of any two modulation schemes is limited, then implementation simplicity is improved, but flexibility in modulation scheme selection is reduced
Solution Approach 1:
The patent changes the parameter being indicated from absolute modulation scheme values to differential values representing the difference between modulation schemes. This parameter change allows the system to maintain a limited difference between modulation bits (simplifying implementation) while still providing flexibility in selecting different modulation schemes through the differential indication mechanism.
Data Source
AI summary
A communication method and apparatus are provided, are applied to the field of communication technologies, may be applied to a wireless local area network system supporting 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax like 802.11be, Wi-Fi 7, or EHT, and 802.11bn, Wi-Fi 8, UHR, Wi-Fi AI, or millimeter wave (MMW), and may be further applied to a WPAN system, a sensing system, and the like supporting UWB. A first communication apparatus generates a PPDU, and sends the PPDU. A second communication apparatus receives the PPDU, and parses the PPDU. The PPDU includes first indication information. The first indication information may indicate a first modulation scheme set and a coding rate. The first modulation scheme set is one of N modulation scheme sets obtained through classification based on W modulation schemes. Q modulation schemes in the first modulation scheme set are used to modulate the PPDU.