Interleaver for HE WLAN PPDU Subchannel Allocation
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Solution Overview
Problem
Current WLAN technologies face limitations in supporting Multi-User Multiple Input Multiple Output (MU-MIMO) and Orthogonal Frequency Division Multiple Access (OFDMA) efficiently within the High Efficiency WLAN Physical layer Protocol Data Unit (HE PPDU), particularly in managing subchannel allocation and interleaving processes.
Innovation Solution
The implementation of a new interleaver and deinterleaver method that allocates subchannels efficiently to multiple Stations (STAs) in a Wireless Local Area Network (WLAN), allowing for the generation and transmission of interleaved data units based on subchannel characteristics, and the reception of deinterleaved data units by STAs, utilizing a baseband processor and RF transceiver to manage PPDU frames across multiple subchannels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional interleaving methods are used in HE PPDU, then the structure is simple, but the ability to support MU-MIMO and OFDMA efficiently is poor
Solution Approach 1:
The interleaver is divided into multiple independent interleavers, with each interleaver corresponding to a specific subchannel. This segmentation allows each interleaver to be optimized for its specific subchannel characteristics while maintaining overall system simplicity. The baseband processor controls multiple interleavers separately, enabling efficient MU-MIMO and OFDMA support without requiring a completely complex unified structure.
Solution Approach 2:
The interleaver configuration is made dynamic through baseband processor control, where interleaving parameters can be adjusted based on subchannel characteristics and transmission requirements. This dynamic adjustment capability allows the system to adapt to different MU-MIMO and OFDMA scenarios without requiring a fixed complex structure, resolving the contradiction between adaptability and complexity.
2Productivity
If subchannels are allocated to multiple STAs, then the system throughput increases, but the management complexity of interleaving processes increases
Solution Approach 1:
The interleaving management is segmented by assigning dedicated interleavers to specific subchannels. Each STA receives subchannels with corresponding dedicated interleavers, allowing independent management of interleaving processes for each STA. This segmentation reduces the management complexity compared to a unified approach, while still enabling high system throughput through parallel processing across multiple subchannels.
Solution Approach 2:
The baseband processor acts as an intermediary that controls and coordinates the multiple interleavers. By centralizing the control function in the baseband processor, the system can manage the complexity of multiple interleaving processes systematically. The baseband processor handles the coordination and parameter management, allowing the throughput benefit of multi-STA operation without proportionally increasing overall system complexity.
3Reliability
If data units are interleaved based on subchannel characteristics, then the transmission reliability improves, but the processing time increases
Solution Approach 1:
The interleaving process is segmented into parallel operations, with each subchannel having its own dedicated interleaver that processes data independently. This parallel processing approach maintains transmission reliability through characteristic-based interleaving while reducing overall processing time compared to sequential processing. Multiple data units can be interleaved simultaneously across different subchannels, achieving both reliability improvement and time efficiency.
Solution Approach 2:
The interleaving parameters and configurations are prepared in advance based on subchannel characteristics before the actual data transmission. By pre-configuring the interleavers with appropriate parameters for each subchannel, the system reduces the processing time during actual data transmission while maintaining the reliability benefits of characteristic-based interleaving. This preliminary preparation allows for faster execution without compromising the reliability improvement.
Data Source
AI summary
The present invention provides a method and apparatus for transmitting using an interleaver applied to a PPDU in a HE WLAN. In an aspect of the present invention, a method for transmitting data to a plurality of STAs through transmission channel by an AP in a WLAN system, wherein the transmission channel is divided into a plurality of subchannels which are allocated to the plurality of STAs respectively, the method may include interleaving a plurality of data units for the plurality of STAs based on characteristics of the plurality of subchannels allocated to the plurality of STAs to generate a plurality of interleaved data units; and transmitting, through the transmission channel, a Physical layer Protocol Data Unit (PPDU) frame including the plurality of interleaved data units respectively on the plurality of subchannels to the plurality of STAs.