Wireless Preamble Segmentation for Multi-Rate Interference
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in coexisting with both normal-rate and low-rate physical layers due to interference, as devices operating at different data rates struggle to detect and defer transmissions, leading to potential collisions and reduced network efficiency.
Innovation Solution
A system comprising a first and second preamble generation module, where the first preamble is configured for normal-rate data transmission and the second preamble for low-rate data transmission, allowing devices to process and defer based on the appropriate preamble, minimizing interference by ensuring correct channel access and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If WLANs operate in high-frequency bands to provide high data rates, then data rate is improved, but range deteriorates due to high frequency of operation
Solution Approach 1:
The patent segments the wireless network into two distinct coexisting systems: high-frequency WLANs for high data rate applications and low-frequency WLANs for extended range applications. Each system operates independently with its own frequency band, allowing both high-speed and long-range requirements to be satisfied simultaneously without mutual interference.
2Length of moving object
If WLANs lower operating frequencies to extend range, then range is improved, but data rate deteriorates due to low bandwidth of operation
Solution Approach 1:
The patent divides the wireless communication spectrum into multiple frequency segments, assigning low-frequency bands (e.g., sub-1 GHz) to range-critical applications and high-frequency bands (e.g., 2.4 GHz, 5 GHz, 60 GHz) to speed-critical applications. This segmentation allows each segment to optimize for its specific requirement without compromising the other.
3Adaptability or versatility
If devices operate at different data rates in the same wireless network, then network versatility is improved, but interference increases as devices struggle to detect and defer transmissions
Solution Approach 1:
The patent introduces frequency band as an intermediary that mediates between devices operating at different data rates. By assigning different frequency bands to different data rate operations, the system enables versatile multi-rate support while using frequency separation as a mediator to prevent interference between simultaneous transmissions.
Data Source
AI summary
An access point including a transceiver having first and second physical layers to communicate at first and second data rates, respectively. The transceiver receives a request from a first client station to reserve first or second sub-channel of a channel for transmitting data at the first or second data rate. In response to receiving the request from the first client station, the transceiver transmits a response to allow the first client station to transmit data and prevent a second client station from transmitting data while the first client station transmits data to the access point. In response to the first client station receiving the response, the first physical layer receives data from the first client station without interference from the second client station.