CSFB Call Return via Stored LTE Cell Scan
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Solution Overview
Problem
Wireless communication devices experience prolonged downtime and increased battery consumption when a CSFB voice call prematurely terminates, as they are forced to camp on a legacy network before reselecting to a faster LTE network, leading to degraded user experience and potential missed calls.
Innovation Solution
The device stores cell information for the LTE network and scans for it directly after premature call termination, allowing a quicker return to the LTE network without first camping on the legacy network, reducing battery consumption and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device camps on the legacy network after premature CSFB call termination, then the device can reestablish connectivity, but the device experiences extended downtime and increased battery consumption before returning to the LTE network
Solution Approach 1:
The device performs a scan for LTE network cells using stored cell information immediately after detecting premature call termination, before camping on the legacy network. This preliminary action enables the device to identify available LTE cells and return to the LTE network more quickly, reducing the downtime while ensuring connectivity is reestablished through the legacy network if needed
2Reliability
If the device camps on the legacy network after premature CSFB call termination, then the device can reestablish connectivity, but battery consumption increases due to extended camping and reselection procedures
Solution Approach 1:
The device performs a scan for LTE network cells using stored cell information immediately after detecting premature call termination, before camping on the legacy network. This preliminary scan reduces the need for extended camping and reselection procedures, thereby reducing battery consumption while ensuring connectivity can be reestablished
3Speed
If the device performs full reselection procedure from legacy network to LTE network, then the device returns to the faster network, but signaling overhead and battery consumption increase
Solution Approach 1:
The device performs a scan for LTE network cells using stored cell information immediately after premature call termination. This preliminary action identifies available LTE cells and their characteristics in advance, allowing the device to perform a more efficient reselection procedure with reduced signaling overhead when returning to the LTE network
Data Source
AI summary
A method for returning to a first network from a second network after premature termination of a CSFB voice call is provided. The method can include a wireless communication device storing cell information for the first network while connected to the first network; participating in a CSFB procedure to transition to the second network in response to initiation of a voice call; and determining that the voice call has prematurely terminated. In response to premature termination of the voice call, the method can further include performing a scan for a first network cell based on stored cell information for up to a maximum scan time period; reselecting to a first network cell in an instance in which a first network cell is identified by the scan; and camping on the second network in an instance in which a first network cell is not identified by the scan.