Multi-Layer WLAN Transmission with Subchannel MCS Adaptation
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Solution Overview
Problem
Current WLAN systems, particularly those based on the IEEE 802.11 standard, face challenges in efficiently supporting communication for a single user using multiple layers, which is essential for achieving high throughput and low latency.
Innovation Solution
The proposed solution involves determining a multi-layer transmission mode that varies modulation and coding schemes (MCS) for each subchannel within a bandwidth channel, generating specific fields to indicate this mode and the distribution of subchannels and MCS, and transmitting a Physical Protocol Data Unit (PPDU) with these fields to an external device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single MCS is used for all subchannels in a bandwidth channel, then the system complexity is low and compatibility is maintained, but channel selective gains cannot be maximized and throughput is limited
Solution Approach 1:
The patent applies local quality by allowing different MCS values to be assigned to different subchannels within a bandwidth channel. Specifically, the first MCS value is applied to a first subchannel while a second MCS value is applied to a second subchannel, enabling each subchannel to be optimized according to its specific channel conditions. This resolves the contradiction by maximizing throughput through localized optimization without requiring complete system redesign.
Solution Approach 2:
The patent segments the bandwidth channel into multiple subchannels, each of which can be independently configured with different MCS values. By dividing the overall transmission into separable subchannel units, the system can apply different modulation and coding schemes to different segments based on their individual channel qualities, thereby achieving higher overall throughput while maintaining manageable complexity through modular configuration.
2Productivity
If multiple MCS values are assigned to different subchannels, then channel selective gains are maximized and throughput increases, but the complexity of transmission mode determination and signal processing increases
Solution Approach 1:
The patent changes the MCS parameter differently for different subchannels to adapt to varying channel conditions. By allowing the MCS parameter to vary across subchannels rather than being uniform, the system can optimize data rates for each subchannel based on its specific characteristics, thereby achieving higher overall data rates while the parameter change is managed through standardized configuration procedures.
3Productivity
If multi-layer transmission mode is implemented for single user, then spectral efficiency and throughput are significantly improved, but the complexity of signal processing and decoding at the receiver increases
Solution Approach 1:
The patent applies preliminary action by indicating the multi-layer transmission mode and subchannel-MCS mapping in advance through signal fields in the transmitted frame. The receiver can use these pre-indicated parameters to prepare appropriate decoding configurations before actually receiving and processing the data, thereby reducing the real-time decoding complexity while still achieving high spectral efficiency through multi-layer transmission.
Data Source
AI summary
A wireless communication method of an apparatus includes determining a multi-layer transmission mode of transmitting data to a single user, based on modulation and coding schemes (MCSs) of each of a plurality of subchannels configuring a bandwidth channel, generating a first field indicating that the wireless communication method is based on the multi-layer transmission mode, generating a second field indicating a distribution of the plurality of subchannels and the MCSs, generating a physical protocol data unit (PPDU) including the first field and the second field, and transmitting the PPDU to an external device.