Uplink Transmission Subchannel Segmentation for PAPR Reduction
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Solution Overview
Problem
Current wireless local area network (WLAN) technologies face inefficiencies in data transmission, particularly in congested environments, as they struggle to maximize data transfer rates and minimize Peak-to-Average Power Ratio (PAPR) while maintaining compatibility with existing standards.
Innovation Solution
The proposed method involves transmitting a request frame with a clear channel assessment (CCA) signal to stations, restricting transmission opportunities based on a primary access category, and using increased FFT sizes to enhance OFDM subcarrier efficiency, thereby optimizing data transmission over subchannels and reducing PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional WLAN transmission methods are used, then backward compatibility with existing standards is maintained, but data transmission efficiency is insufficient in congested environments
Solution Approach 1:
The patent divides the transmission channel into multiple sub-channels (e.g., 7 sub-channels for 20 MHz each in a 140 MHz bandwidth) and allows simultaneous transmissions on different sub-channels. This segmentation enables parallel data transmission to improve productivity while maintaining compatibility with existing 802.11ac standards through structured resource allocation.
Solution Approach 2:
The patent introduces multi-subchannel transmission as an additional dimension beyond traditional single-channel transmission. By operating across multiple sub-channels simultaneously with different modulation schemes and power levels, the system achieves higher data transmission efficiency while preserving backward compatibility through layered protocol design.
2Productivity
If transmission power is increased to improve data transfer rate, then data transmission efficiency increases, but Peak-to-Average Power Ratio (PAPR) increases
Solution Approach 1:
The patent segments the total transmission power across multiple sub-channels, allowing each sub-channel to operate at a lower power level while the aggregate system achieves high data transfer rates. This power segmentation reduces PAPR by distributing peak power demands across multiple independent transmission paths rather than concentrating them in a single channel.
Solution Approach 2:
The patent dynamically adjusts transmission parameters including power levels, modulation schemes, and sub-channel allocations based on channel conditions and traffic requirements. By changing these parameters adaptively, the system optimizes data transfer rates while controlling PAPR through coordinated power management across multiple sub-channels.
3Productivity
If multiple stations transmit simultaneously to increase throughput, then data transmission efficiency improves, but collision probability increases
Solution Approach 1:
The patent segments the available spectrum into multiple sub-channels and assigns different sub-channels to different stations for simultaneous transmission. This spatial segmentation of the frequency domain reduces collision probability by isolating transmissions on different sub-channels while maintaining high throughput through parallel communication.
Solution Approach 2:
The patent implements feedback mechanisms where stations report channel conditions, transmission status, and queue information to the access point. The access point uses this feedback to dynamically allocate sub-channels and adjust transmission parameters, optimizing throughput while minimizing collisions through informed resource management.
4Loss of time
If transmission time is reduced to improve time efficiency, then time efficiency improves, but transmission reliability may decrease
Solution Approach 1:
The patent segments the transmission process into multiple simultaneous sub-channel transmissions that occur within the same time slot. By dividing the total transmission time across parallel sub-channels, the system achieves time efficiency through concurrent operations while maintaining reliability through distributed transmission paths that reduce single-point failures.
Data Source
AI summary
A method for transmitting data in a wireless local area network and the device using the same are provided. The method includes steps to transmit a request frame from an access point (AP) to a plurality of stations. The stations respond by transmitting physical layer protocol data units (PPDUs) in response to the request frame. The request frame and the responsive PPDU's are uniquely structured to increase communication efficiency.