Wireless Device Network Reselection Using Signal-to-Noise Ratio
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Solution Overview
Problem
Wireless communication devices operating in environments with overlapping LTE and legacy networks face challenges in reselecting networks due to interference, where signal strength alone may not ensure adequate channel quality for communication, leading to potential missed signaling messages and poor reception.
Innovation Solution
Implementing a method for wireless communication devices to measure and compare signal-to-noise ratio (SNR) in addition to signal strength, allowing for network reselection based on SNR thresholds, even if signal strength meets configured thresholds, to mitigate interference and improve data reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless communication device reselects to a legacy network based on signal strength threshold, then the device can maintain connection in areas with weak LTE signal, but the device may experience significant interference and poor reception when remaining on LTE network with sufficient signal strength but high interference
Solution Approach 1:
The patent changes the reselection criterion from signal strength alone to signal-to-noise ratio (SNR), which incorporates both signal strength and interference levels. This parameter change allows the device to identify and avoid high-interference areas even when signal strength appears sufficient, thereby improving reception reliability by selecting networks based on actual signal quality rather than just power level.
2Reliability
If a wireless communication device uses signal strength as the sole criterion for network reselection, then the reselection process is simple and fast, but the device may fail to detect adequate channel quality and miss signaling messages
Solution Approach 1:
The patent applies preliminary action by measuring the signal-to-noise ratio before making a network reselection decision. This advance measurement of signal quality (including interference assessment) allows the device to predict potential reception problems and proactively switch networks before signaling messages are missed, rather than reacting after failures occur.
3Productivity
If a wireless communication device remains on LTE network to enjoy faster data rates, then the device can utilize higher speed data transmission, but the device may suffer from degraded signal quality and interference at cell edges
Solution Approach 1:
The patent implements dynamic network selection by continuously monitoring SNR and adjusting network affiliation based on current conditions. Rather than statically remaining on LTE for speed, the device dynamically switches between LTE and legacy networks based on real-time signal quality assessments, allowing it to capture LTE speed benefits when available while avoiding interference-prone situations that would degrade communication quality.
Data Source
AI summary
A method for network reselection by a wireless communication device is provided. The wireless communication device can have an established connection to a first network. The method can include measuring a signal strength and a signal-to-noise ratio of the first network. The method can further include determining that the signal strength satisfies a signal strength threshold. The method can additionally include comparing the signal-to-noise ratio to a signal-to-noise ratio threshold. The method can also include disconnecting from the first network and reselecting to a second network in an instance in which the signal-to-noise ratio does not satisfy the signal-to-noise ratio threshold even though the signal strength satisfies the signal strength threshold.