PHY Data Unit MCS Mixing for Low-Latency WLAN Transmission
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Solution Overview
Problem
Current wireless local area network (WLAN) technologies face challenges in efficiently transmitting data streams with different modulation and coding schemes (MCS) simultaneously, particularly in mixed environments with devices supporting both high-throughput (VHT) and legacy protocols, where ensuring low latency and reliability across varying data rates and quality levels is crucial.
Innovation Solution
A PHY processing unit is configured to encode and modulate data streams such that the resulting data rate of lower reliability data is less than that of higher reliability data, generating a single PHY data unit or aggregated/burst units with different MCS, allowing for simultaneous transmission of data with varying quality and reliability levels, accommodating both VHT and legacy protocol devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data streams with different MCS are transmitted simultaneously using a single PHY data unit, then transmission reliability and efficiency are enhanced, but device complexity increases
Solution Approach 1:
The data stream is segmented into multiple portions, each assigned a different MCS level. High-reliability data portions use robust modulation schemes while low-reliability portions use更高效 schemes, allowing simultaneous transmission with different reliability requirements within a single PHY data unit structure.
Solution Approach 2:
Different portions of the data stream are assigned different quality levels through distinct MCS configurations. This local differentiation allows each data portion to be transmitted with appropriate reliability based on its specific requirements, rather than applying a uniform MCS to the entire stream.
2Adaptability or versatility
If multiple PHY data units are generated for different data streams, then data transmission flexibility is improved, but transmission latency increases
Solution Approach 1:
Multiple data streams with different MCS requirements are merged into a single PHY data unit structure. This consolidation allows simultaneous transmission of diverse data types without requiring separate PHY units, thereby reducing latency while maintaining the flexibility to handle different data requirements.
Solution Approach 2:
The PHY data unit structure is designed to be universal, capable of accommodating multiple data streams with different MCS configurations within a single unit. This multi-functional approach eliminates the need for separate specialized PHY units for different data types.
3Productivity
If higher data rates are used for all data streams, then productivity is improved, but transmission reliability deteriorates
Solution Approach 1:
The modulation and coding parameters are dynamically changed for different data stream portions based on their reliability requirements. Critical data portions use conservative parameters with lower data rates but higher reliability, while non-critical portions use aggressive parameters for maximum throughput.
Data Source
AI summary
In a method for generating a physical layer (PHY) data unit for transmission via a communication channel, first data and second data that correspond to a unit of audio, video, and/or image information is received. The first data and the second data are encoded and modulated so that a resulting data rate of the first data is less than a resulting data rate of the second data. The first data and the second data are parsed to a plurality of spatial streams, and a single PHY data unit that includes the plurality of spatial streams is generated.