WLAN Multi-Channel PHY Preamble Segmentation for Spatial Stream Adaptation
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Solution Overview
Problem
In wireless local area networks (WLAN) using multi-channels, existing technologies face challenges in improving radio resource usage efficiency and transmission efficiency due to the need for wide frequency bandwidths, which is difficult to secure, and the inefficiency in transmitting data over non-contiguous sub-channels.
Innovation Solution
A method and apparatus for transmitting control information in a WLAN system using a multi-channel by aggregating a first and second sub-channel, where different Modulation and Coding Scheme (MCS) values and spatial streams are set for each sub-channel, with simultaneous transmission of PHY preambles containing control information necessary for demodulation and decoding, allowing for adaptive link adaptation based on channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multi-channel obtained by aggregating non-contiguous sub-channels is used to secure wide frequency bandwidth, then the throughput can be increased, but the radio resource usage efficiency deteriorates due to difficulty in securing contiguous channels and increased complexity in managing multiple sub-channels
Solution Approach 1:
The patent divides the transmission into separate PHY preambles for each sub-channel (first PHY preamble for first sub-channel, second PHY preamble for second sub-channel). This segmentation allows independent optimization and management of each sub-channel while maintaining overall multi-channel operation, thereby improving radio resource usage efficiency without sacrificing throughput
Solution Approach 2:
The patent applies different Modulation and Coding Scheme (MCS) values and spatial stream configurations to different sub-channels based on their individual channel conditions. This local optimization allows each sub-channel to operate at its optimal performance level, improving overall radio resource usage efficiency while maintaining high throughput
2Productivity
If different MCS values and spatial streams are configured for each sub-channel to optimize transmission, then the transmission efficiency improves, but the device complexity increases due to need for separate control information and synchronization management
Solution Approach 1:
The patent segments control information into separate PHY preambles for each sub-channel. Each PHY preamble contains control information specific to its sub-channel, eliminating the need for complex centralized control management and reducing device complexity while maintaining transmission efficiency
Solution Approach 2:
Each sub-channel's PHY preamble is self-contained with its own control information necessary for demodulation and decoding. This self-service approach allows each sub-channel to be independently managed without requiring complex inter-sub-channel coordination, reducing overall system complexity
3Adaptability or versatility
If separate PHY preambles are transmitted for each sub-channel to provide necessary control information, then the adaptability to channel conditions improves, but the protocol complexity increases due to simultaneous transmission coordination requirements
Solution Approach 1:
The patent segments the control information into separate PHY preambles for each sub-channel, allowing independent adaptation to channel conditions. This segmentation simplifies the protocol by making each preamble self-contained and independently processable, reducing overall protocol complexity while maintaining high adaptability
Data Source
AI summary
A method of transmitting control information in a WLAN system using a multi-channel obtained by aggregating a first sub-channel and a second sub-channel is provided. The method includes transmitting, by a transmitting station, a first physical (PHY) preamble over the first sub-channel, transmitting, by the transmitting station, a second PHY preamble over the second sub-channel, and transmitting, by the transmitting station, data symbols using N spatial streams transmitted over the first sub-channel and M spatial streams transmitted over the second sub-channel, wherein the first PHY preamble comprises control information necessary to demodulate and decode the data symbols transmitted over the N spatial streams, and the second PHY preamble comprises control information necessary to demodulate and decode the data symbols transmitted over the M spatial streams, and the first PHY preamble and the second PHY preamble are simultaneously transmitted, and the N and the M are different natural numbers.