RF Repeater Relaying Power-Constrained Device Frames
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Solution Overview
Problem
Wireless local area network (WLAN) systems based on IEEE 802.11 technology face challenges in extending the reach of transmissions from power-constrained devices, such as sensors with decaying batteries, which may not have sufficient power to reach the access point, leading to weak or unreliable connections.
Innovation Solution
A radio-frequency (RF) repeater system that distinguishes between power-constrained devices and those with sufficient power using a device type indicator in the PHY layer, relaying frames only from power-constrained devices to ensure they reach the access point, thereby extending their transmission range without the need for complex relay functions or additional processing layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If power-constrained devices transmit signals directly to the access point, then the device structure remains simple, but the transmission range is limited due to insufficient power
Solution Approach 1:
The patent introduces an RF repeater as an intermediary device that receives signals from power-constrained devices and retransmits them to the access point. The repeater is identified by a specific device type indicator (0x01) in the PHY layer, enabling it to distinguish and relay frames from power-constrained devices without requiring complex processing or additional protocol layers.
2Length of moving object
If the RF repeater relays all frames, then all devices benefit from extended range, but power-constrained devices waste energy on unnecessary relaying
Solution Approach 1:
The patent applies local quality by making the RF repeater selectively relay frames based on the device type indicator in the PHY layer. The repeater examines the indicator and only relays frames from power-constrained devices (indicator = 1), while discarding frames from other devices. This selective relaying extends range where needed while avoiding unnecessary energy consumption and network traffic.
3Reliability
If the system uses complex relay functions and additional processing layers to extend range, then transmission reliability improves, but device complexity increases
Solution Approach 1:
The patent extracts the relay function from complex multi-layer processing and implements it directly at the PHY layer through a simple device type indicator mechanism. The RF repeater identifies power-constrained devices by checking the device type indicator (0x01) in the PHY layer header and relays their frames without requiring MAC layer processing or complex relay protocols, thus maintaining reliability while minimizing complexity.
Data Source
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AI summary
In one embodiment, a method for relaying frames including receiving, by a repeater from a first station, a first frame, where the first frame has a first header having a first indicator and determining whether the first frame will be relayed in accordance with the first indicator. The method also includes transmitting, by the repeater to an access point, the first frame when the first frame is determined to be relayed.