MIMO-OFDMA PPDU Sub-channel Segmentation for WLAN Throughput
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Solution Overview
Problem
Current wireless local area network (WLAN) technologies face challenges in improving spectrum efficiency and area throughput, especially in dense environments with multiple access points and stations, and fail to effectively address performance enhancements in outdoor settings and overlapping basic service sets.
Innovation Solution
The implementation of a method and apparatus using Multiple Input Multiple Output (MIMO)-Orthogonal Frequency Division Multiple Access (OFDMA) format physical layer convergence procedure (PLCP) protocol data units (PPDUs) for data transmission to multiple stations, ensuring time synchronization and identical training fields across sub-channel format PPDUs transmitted through various sub-channel bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO-OFDMA format PPDUs are transmitted to multiple STAs through multiple sub-channel bands, then data throughput and frequency efficiency are improved, but device complexity and signal coordination difficulty increase
Solution Approach 1:
The patent divides the wireless communication system into multiple independent sub-channel bands, with each sub-channel transmitting PPDUs to specific STAs. This segmentation allows parallel data transmission across multiple frequency resources, thereby increasing overall data throughput while maintaining manageable complexity within each sub-channel.
Solution Approach 2:
The patent extends the transmission dimension by utilizing multiple frequency sub-channels simultaneously. Instead of transmitting to multiple STAs sequentially or through a single channel, the system transmits across multiple frequency dimensions at once, achieving throughput improvement without proportionally increasing device complexity.
2Productivity
If MIMO-OFDMA format PPDUs are transmitted to multiple STAs through multiple sub-channel bands, then frequency efficiency is improved, but device complexity and signal coordination difficulty increase
Solution Approach 1:
The patent segments the available spectrum into multiple sub-channel bands, allowing efficient utilization of frequency resources. Each sub-channel can be independently managed and transmitted, improving frequency efficiency while keeping the complexity of managing each individual sub-channel at acceptable levels.
Solution Approach 2:
The MIMO-OFDMA format PPDU structure is designed to be universally applicable across multiple sub-channel bands. The same transmission format and protocol can be reused across different frequency resources, achieving frequency efficiency improvement without requiring complex specialized handling for each channel.
3Reliability
If the number of training fields for MIMO transmission is made identical across sub-channel format PPDUs, then system performance and synchronization are improved, but transmission overhead increases
Solution Approach 1:
The patent standardizes the number of training fields as a fixed parameter across all sub-channel format PPDUs. By making this parameter identical and consistent throughout the system, synchronization and system performance are improved, while the overhead becomes predictable and manageable through uniform parameter specification.
Data Source
AI summary
Disclosed are a method and a device for transferring data from a wireless LAN to a plurality of stations (STAs). The method for transferring data from a wireless LAN to a plurality of STAs may comprise: a step in which an AP generates a MIMOOFDMA format PPDU; and a step in the AP transfers the MIMO-OFDMA format PPDU to the plurality of STAs, wherein the MIMO-OFDMA format PPDU comprises a plurality of sub-channel format PPDUs which are synchronized in time phase, and the plurality of sub-channel format PPDUs are transferred respectively to the plurality of STAs through a plurality of respective sub-channel bands, and the number of training fields for the MIMO transfer which are included in the respective plurality of subchannel format PPDUs can be the same.