Data Session Continuity After Circuit Switched Fallback
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Solution Overview
Problem
After a circuit switched fallback procedure, ongoing data sessions are often transferred to legacy networks with lower data rates, leading to inadequate throughput and potential session drops, resulting in poor user experience and increased incidence of dropped connections.
Innovation Solution
A wireless communication device determines if sufficient resources are available on the legacy network to support a minimum threshold throughput for the data session after a voice call has terminated and reverts back to the original network if resources are insufficient, ensuring continued data sessions with faster data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless communication device performs a circuit switched fallback procedure to transition from an LTE network to a legacy network for voice call support, then voice call capability is improved, but data session throughput deteriorates due to lower data rates on the legacy network
Solution Approach 1:
The patent implements dynamic network selection by allowing the wireless communication device to switch between LTE and legacy networks based on real-time conditions. After a CSFB procedure, the device evaluates data rate requirements and automatically reverts to the LTE network when sufficient resources are available, making the network connection adaptable rather than static.
Solution Approach 2:
The patent changes the operational parameters by introducing threshold-based decision-making for network retention. The network controller compares actual data rates against minimum threshold requirements and adjusts the network configuration accordingly, either maintaining the legacy network connection or triggering a revert to LTE based on whether thresholds are met.
2Stability of the object's composition
If a wireless communication device remains on a legacy network after a voice call terminates, then network stability is improved, but data session reliability deteriorates due to insufficient throughput resources
Solution Approach 1:
The patent implements a feedback mechanism where the network controller continuously monitors data rate performance on the legacy network and compares it against minimum threshold requirements. This feedback loop enables automatic decision-making: when throughput falls below thresholds, the system triggers a network revert action to restore reliable data sessions while maintaining stability when conditions are adequate.
3Loss of energy
If data rates on a legacy network are insufficient to support minimum threshold throughput, then resource conservation is improved, but user experience deteriorates due to slow or dropped data sessions
Solution Approach 1:
The patent applies parameter changes by establishing minimum threshold throughput levels as decision criteria. The network controller dynamically adjusts network configuration based on whether actual data rates meet these parameters, automatically triggering network reversion when thresholds are not satisfied to maintain acceptable user experience while avoiding unnecessary network switching when resources are sufficient.
Data Source
AI summary
A method of supporting continuation of a data session at a wireless communication device after performance of a circuit switched fallback (CSFB) procedure is provided. The method can include establishing a data session while connected to a first network and determining an initiation of a voice call while the data session is ongoing over the first network. The method can further include participating in a CSFB procedure to transition from the first network to a second network in response to initiation of the voice call. After termination of the voice call, the method can additionally include determining that sufficient resources are not available to the wireless communication device on the second network to support a minimum threshold throughput for the data session. The method can also include reverting to the first network in response to determining that sufficient resources are not available to support the minimum threshold throughput.