WLAN Training Field Configuration for Channel Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless LAN systems face challenges in efficiently transmitting and receiving signals, particularly in OFDM mode, due to limitations in training field configuration and channel bonding techniques, which affect data throughput and reliability.
Innovation Solution
The method involves configuring a training subfield per space-time stream based on information in the header field, using Enhanced Directional Multi-Gigabit (EDMG) training subfield sequences, and adjusting the number of OFDM symbols to optimize signal transmission and reception across multiple channels, allowing for flexible channel bonding and improved data transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel bonding techniques are applied to increase bandwidth, then data throughput is improved, but signal transmission reliability deteriorates due to increased complexity in training field configuration
Solution Approach 1:
The training field is segmented into multiple training subfields, each corresponding to different space-time streams. This segmentation allows independent configuration and optimization of each subfield for channel bonding, maintaining reliability while enabling throughput improvement through parallel training sequences across multiple channels.
Solution Approach 2:
The patent extends training field configuration from single-channel dimension to multi-channel dimension by introducing training subfields across multiple space-time streams. This dimensional expansion enables simultaneous training on bonded channels, resolving the reliability issue while achieving throughput improvement through parallel processing.
2Productivity
If MIMO techniques are applied to increase spatial streams, then data throughput is improved, but device complexity increases due to more extensive training field requirements
Solution Approach 1:
The training subfield structure is designed to be universal across different numbers of space-time streams. Each training subfield can serve multiple functions: channel estimation, synchronization, and beamforming training. This multi-functionality reduces overall complexity by eliminating the need for separate training sequences for different MIMO configurations.
Solution Approach 2:
The patent employs parameter changes in the training subfield configuration, where the number and structure of training subfields are dynamically adjusted based on the number of space-time streams. This allows the system to optimize training overhead for different MIMO configurations, reducing complexity while maintaining throughput improvements.
3Reliability
If training field configuration is increased to improve signal reliability, then transmission reliability is improved, but data transmission efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent applies partial training subfields for different space-time streams, where not all streams require full training sequences. By applying training selectively and partially to streams that need it most, the system achieves sufficient reliability while minimizing overhead that would reduce transmission efficiency.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present specification proposes a method for transmitting and receiving a signal, and an apparatus therefor, and more specifically, a method for transmitting, by a first station (STA), a signal to a second STA in a wireless LAN (WLAN) system, the method comprising the steps of: generating a training field including a basic training subfield for each spatial-temporal stream and a training subfield for each spatial-temporal stream on the basis of the total number of spatial-temporal streams, wherein the basic training subfield for each spatial-temporal stream is composed of M (M is a natural number) orthogonal frequency division multiplexing (OFDM) symbols on the basis of the information indicated by a header field; and transmitting a signal including the header field and the training field to the second STA through a corresponding spatial-temporal stream.