Reduced Bandwidth Pilot Message for Weak Signal Detection
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Solution Overview
Problem
In wireless networks, establishing a reliable connection between a mobile station and a base station is challenging under weak or unfavorable signal conditions, as existing methods may fail to recognize pilot messages effectively due to low signal strength.
Innovation Solution
The method involves transmitting a pilot message with reduced bandwidth and non-orthogonal pilot tones from the mobile station to increase signal strength, allowing the base station to detect and beamsteer towards the mobile station, followed by increasing bandwidth for data transmission once a connection is established.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard bandwidth is used for pilot message transmission, then data transmission capacity is maintained, but signal strength is insufficient for reliable detection under weak signal conditions
Solution Approach 1:
The patent changes the bandwidth parameter dynamically based on connection establishment needs. During connection establishment, the mobile station transmits pilot messages using reduced bandwidth (e.g., 1.4 MHz instead of standard bandwidth) to concentrate power and improve signal strength for reliable detection. After successful connection, the system switches to standard bandwidth for normal data transmission.
2Reliability
If reduced bandwidth is used for pilot message transmission, then signal strength is increased for better detection, but data transmission capacity is reduced
Solution Approach 1:
The patent implements dynamic bandwidth adjustment where the bandwidth parameter is not fixed but changes based on the operational phase. The system uses reduced bandwidth dynamically only during the connection establishment phase when pilot messages are transmitted, and switches to full bandwidth dynamically during the data transmission phase, optimizing both detection reliability and transmission capacity at different times.
3Reliability
If pilot message is transmitted at full power across standard bandwidth, then signal strength is maximized, but energy consumption increases
Solution Approach 1:
The patent changes the bandwidth parameter to reduce energy consumption during connection establishment. By transmitting pilot messages at reduced bandwidth, the mobile station concentrates its transmit power into a narrower frequency range, achieving sufficient signal strength for detection while reducing total energy consumption compared to transmitting at full power across the entire standard bandwidth.
Data Source
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AI summary
A method comprising, at a mobile station, transmitting a pilot message to a base station in response to determining that no signal has been received at the mobile station within a predetermined time period or that a received signal has been below a predetermined intensity within a predetermined time period, said pilot message comprising a pilot tone sent at reduced bandwidth, and receiving a response from the base station, said response beamsteered towards the receive direction and/or power of the pilot message.