Call Setup Network Switching for Poor Signal Quality
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Solution Overview
Problem
Existing communication systems face challenges in seamlessly transitioning from packet-switched networks to circuit-switched networks during call setup in LTE standards, particularly when signal quality is poor, leading to suboptimal call establishment and potential service disruptions.
Innovation Solution
A method is introduced where user equipment receives a measurement configuration message for poor signal quality events, sends a measurement report, and upon indicating poor signal quality, terminates the initial call setup process and initiates a second call setup process using a circuit-switched network, with the base station determining the transition based on the measurement report and sending appropriate signaling messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the call setup process uses the packet-switched network, then the call establishment follows modern IP-based protocols, but the call reliability deteriorates when signal quality is poor
Solution Approach 1:
The system dynamically switches between packet-switched and circuit-switched networks based on real-time signal quality conditions. The call setup process adapts its network selection by monitoring signal strength and transitioning to the circuit-switched network when packet-switched signal quality deteriorates, ensuring reliable call establishment under varying network conditions
Solution Approach 2:
The invention changes the network type parameter from packet-switched to circuit-switched based on signal quality thresholds. When signal quality parameters indicate poor conditions, the system modifies the network selection parameter to use the circuit-switched network, which provides more reliable connection establishment in challenging radio conditions
2Reliability
If the system switches to circuit-switched network when signal quality is poor, then the call setup reliability improves, but the service complexity increases due to dual network support
Solution Approach 1:
The system performs preliminary network assessment during the call setup process by evaluating signal quality before final network selection. Measurement configuration messages are sent in advance to assess packet-switched network conditions, and based on these preliminary measurements, the system proactively selects the appropriate network (packet-switched or circuit-switched) to avoid failed call setups
Solution Approach 2:
The invention introduces measurement report messages as an intermediary mechanism between the user equipment and the network. These messages carry signal quality information that mediates the decision-making process for network selection, allowing the system to objectively determine whether to use packet-switched or circuit-switched networks based on measured conditions rather than arbitrary choices
3Reliability
If the call setup terminates the first process and starts a second process, then the call establishment succeeds under poor signal conditions, but the setup time increases due to process termination and restart
Solution Approach 1:
The system performs preliminary signal quality measurements and network assessments during the initial call setup process before committing to a specific network. By evaluating packet-switched network conditions in advance through measurement reports, the system can proactively switch to circuit-switched network if conditions are poor, avoiding the need for complete call setup failure and retry, thus reducing overall setup time
Solution Approach 2:
When poor signal quality is detected during packet-switched call setup, the system skips the remainder of the packet-switched setup process and directly transitions to circuit-switched network setup. This skipping mechanism avoids wasting time on注定失败的 packet-switched establishment and rushes through to the alternative network path, minimizing total call setup time while ensuring successful connection
Data Source
AI summary
Aspects of the disclosure provide a method for setting up a call for a user equipment. The method includes receiving, by the user equipment, a measurement configuration message that specifies a set of measurement events corresponding to poor signal quality between the user equipment and a packet-switched network, and sending, by the user equipment, a measurement report when one of the set of measurement events occurs while performing a first call setup process for setting up the call using the packet-switched network. The method also includes terminating the first call setup process after sending the measurement report that indicates poor signal quality between the user equipment and the packet-switched network, and sending, by the user equipment, a service request to begin a second call setup process for setting up the call for the user equipment using a circuit-switched network after terminating the first call setup process.