Mobile Terminated Control via Connection-Maintaining Request
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Solution Overview
Problem
In mobile radio communications networks, there are significant delays and service interruptions when mobile terminals switch between different communication systems, particularly during Circuit Switched Fallback (CSFB) procedures, leading to potential failures in mobile terminated communications due to misalignments between Tracking Areas (TA) and Location Areas (LA) and improper handling of paging signals.
Innovation Solution
A method is introduced where a connection-maintaining request is transmitted from the mobile terminal device to the network node during the mobile terminated procedure, specifically during a location update and after fallback to a circuit-switched system, to ensure continued connectivity and prevent connection release, thereby reducing the risk of signaling failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile terminal switches between different communication systems during CSFB procedures, then connectivity optimization is achieved, but service interruptions and delays occur due to connection release
Solution Approach 1:
The network node performs preliminary actions by predicting that mobile terminated communications may be ongoing before the location update procedure completes. The connection is maintained proactively rather than reactively, preventing service interruption before it occurs.
Solution Approach 2:
The solution implements a feedback mechanism where the network node monitors the completion status of location update procedures and uses this information to determine whether to maintain or release connections. This feedback loop ensures connectivity decisions are based on actual procedure status.
2Productivity
If the network node releases connection after location update procedure completion, then resource management is improved, but mobile terminated communications fail due to connection surrender
Solution Approach 1:
The network node performs preliminary assessment before releasing the connection to determine if mobile terminated communications are ongoing. This preliminary check prevents premature connection release that would cause communication failures.
Solution Approach 2:
The network node uses feedback from procedure completion status and communication state monitoring to make informed decisions about connection release, balancing resource management with communication reliability.
3Reliability
If repeat-paging is performed to re-establish connection, then communication reliability is improved, but signaling delays increase
Solution Approach 1:
The connection is maintained in advance before it would be released and before repeat-paging would be necessary. This preliminary maintenance eliminates the need for subsequent re-establishment actions and associated delays.
Solution Approach 2:
The solution skips the repeat-paging step entirely by maintaining the connection continuously. The harmful intermediate step of releasing and re-establishing the connection is eliminated, rushing through to the desired state of continuous connectivity.
Data Source
AI summary
The invention provides for a method of controlling a mobile terminated procedure between a mobile terminal device and a network node device of a mobile radio communications network, and to a related terminal device, and particularly concerning a change in network node connection as part of a Circuit Switched Fallback procedure, and including the step of transmitting a connection-maintaining request such as a follow-on-request from the terminal device to the network node device during the mobile terminated procedure and seeking to maintain connectivity with the network node device so as to allow for a post location update procedure arriving from the network.