Mobile Terminal Session Context Preservation During Temporary Unavailability
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Solution Overview
Problem
In mobile radio communication systems, temporary unavailability of mobile terminals during procedures like OS updates leads to unnecessary detachment and re-establishment of sessions, causing significant signaling effort and disruptions.
Innovation Solution
A method is introduced where the communication network detects temporary unavailability of mobile terminals due to data processing procedures and sends an indication to relevant components, allowing the network to maintain session contexts and buffer data, reducing signaling and maintaining connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network performs detach procedure when mobile terminal becomes unreachable, then session management context is released, but signaling overhead increases and connectivity is disrupted
Solution Approach 1:
The network detects temporary unavailability causes (such as OS updates, factory resets, or manual PLMN selection) before the terminal actually detaches, and proactively preserves the session management context and mobility management context. This preliminary preservation action avoids the need for full re-establishment procedures when the terminal returns, thereby maintaining session continuity and reducing reconnection time.
Solution Approach 2:
The network introduces an indication mechanism that acts as an intermediary between the terminal's unavailability state and the session management system. When temporary unavailability is detected, this indication triggers the network to maintain contexts without requiring actual terminal presence, serving as a mediator that prevents unnecessary detachment while still accounting for terminal unreachability.
2Device complexity
If the network releases all sessions during detachment, then resource allocation is simplified, but signaling effort increases significantly
Solution Approach 1:
The network performs preliminary detection of temporary unavailability causes and takes preventive action by preserving session contexts before detachment occurs. This avoids the energy-consuming re-establishment signaling that would otherwise be required, while maintaining manageable complexity through targeted context preservation rather than universal release.
Solution Approach 2:
The network changes the state parameter of session management contexts from 'released' to 'preserved' based on the detected unavailability cause. This parameter change allows the system to differentiate between temporary and permanent unavailability, enabling selective context maintenance that reduces signaling energy while keeping complexity manageable through conditional logic.
3Ease of operation
If the network maintains session contexts during temporary unavailability, then reconnection is smoother, but network resources are consumed during terminal absence
Solution Approach 1:
The network performs preliminary detection of temporary unavailability and selectively preserves session contexts only for terminals experiencing known temporary issues (OS updates, factory resets, manual PLMN selection). This preliminary action enables smooth reconnection for affected terminals while avoiding unnecessary resource consumption for other cases, achieving a balance between ease of operation and resource efficiency.
Solution Approach 2:
The network applies different quality of service to different session contexts based on the terminal's unavailability cause. Terminals with temporary unavailability receive context preservation (higher resource allocation), while others receive standard detachment handling. This local differentiation optimizes the balance between reconnection smoothness and resource consumption by applying resource-intensive measures only where necessary.
Data Source
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AI summary
According to an embodiment, a method for providing a communication service to a mobile terminal by a communication network is described comprising detecting that a mobile terminal is temporarily unreachable for the communication network due to the mobile terminal carrying out a predetermined data processing procedure, sending an indication that the mobile terminal is temporarily unreachable for the communication network in reaction to the detection to a component for providing a communication service and providing, in reaction to a reception of the indication, the communication service to the mobile terminal taking into account that the mobile terminal is temporarily unreachable for the communication network.