Multiple Spatial Stream MCS Adaptation for Higher Wi-Fi Throughput
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Solution Overview
Problem
Existing Wi-Fi systems face challenges with small system throughput and insufficient flexibility in spatial stream scheduling due to the use of unified modulation and coding schemes for multiple spatial streams, leading to inefficient utilization of channel capacity and increased retransmission overheads.
Innovation Solution
A method and apparatus that configure different modulation and coding schemes for each spatial stream, allowing independent coding, modulation, and transmission, with adaptive MCS determination based on receiver capability and channel quality, enabling independent retransmission of individual spatial streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If unified modulation and coding schemes are used for multiple spatial streams, then device complexity is reduced, but system throughput decreases and scheduling flexibility is insufficient
Solution Approach 1:
The patent segments the unified modulation and coding scheme into separate MCS configurations for each spatial stream. Each spatial stream can be independently coded and modulated with its own MCS, allowing the system to optimize throughput for each stream based on channel conditions while maintaining manageable complexity through structured configuration methods.
Solution Approach 2:
The patent introduces dynamic MCS configuration where each spatial stream can have different modulation and coding parameters adapted to channel conditions. The system dynamically selects MCS for each stream based on receiver capability feedback and channel quality, enabling throughput optimization without requiring overly complex centralized control.
2Productivity
If different modulation and coding schemes are configured for each spatial stream, then system throughput is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by allowing each spatial stream to have its own MCS configuration tailored to its specific channel conditions and receiver capability. This enables localized optimization of each stream's transmission parameters, improving overall throughput while maintaining simplicity through the use of standardized configuration procedures.
Solution Approach 2:
The patent implements feedback mechanisms where the receiver provides capability information to the transmitter, enabling the transmitter to determine appropriate MCS for each spatial stream. This feedback loop allows adaptive MCS configuration that optimizes throughput without requiring the transmitter to pre-know all possible channel conditions, thus managing complexity.
3Adaptability or versatility
If independent coding and modulation are performed for each spatial stream, then scheduling flexibility is improved, but retransmission overhead increases
Solution Approach 1:
The patent segments the data transmission into independently coded spatial streams, each with its own MCS. This segmentation enables selective retransmission of only those streams that failed decoding, rather than retransmitting all streams. The independent coding structure allows the receiver to request retransmission of specific streams based on individual decoding outcomes, reducing overall retransmission overhead.
4Productivity
If unified MCS is used for all spatial streams, then device complexity is reduced, but bearer capability utilization is insufficient
Solution Approach 1:
The patent changes the parameters of modulation and coding independently for each spatial stream based on channel conditions and receiver capability. By allowing MCS parameters to vary per stream rather than being unified, the system can fully utilize the bearer capability of each stream according to its specific conditions, improving overall throughput while using structured parameter management to control complexity.
Data Source
AI summary
Example multiple spatial stream transmission methods and apparatus are described. One example method includes A transmitter device obtaining, by a transmitter device, a modulation and coding scheme (MCS) corresponding to each of multiple spatial streams. The transmitter device sends data of the multiple spatial streams based on the MCS corresponding to each spatial stream. A receiver device receives the data of the multiple spatial streams, and decodes and demodulates the data of each spatial stream based on the MCS corresponding to each spatial stream.