Triggering Message for Mobile Terminal Session Initiation
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Solution Overview
Problem
The initiation of push-to-talk services in public mobile communication systems is complicated due to users' reluctance to remain constantly connected to the GPRS network, fearing unwanted data and costs, especially when dynamic IP addresses are used, making it difficult to start a packet-based service session without ensuring all participants are connected.
Innovation Solution
A separate triggering message, such as an SMS or MBMS message, is used to move mobile terminals from a disconnected state to a connected state, allowing them to receive packets for a packet-based service session, enabling users to initiate sessions without needing to check if others are connected, and allowing timed invitations for future sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If users stay connected to the GPRS network to enable packet-based services, then service availability is improved, but network resource usage and user costs increase
Solution Approach 1:
The system performs preliminary actions by sending a triggering message (SMS/MMS/MBMS) to the terminal before the actual packet-based service session begins. This triggers the terminal to transition from detached to attached state in advance, ensuring service availability when needed while allowing the terminal to return to detached state after the session, thus reducing overall network resource usage.
2Reliability
If users stay connected to the GPRS network to enable packet-based services, then service availability is improved, but user costs and security risks increase
Solution Approach 1:
The triggering message mechanism allows the system to prepare the terminal for service delivery just in time, rather than requiring continuous connection. The terminal attaches to the network only when a triggering message is received, receives the packet-based service data, and then can detach again, avoiding exposure to unwanted data and associated costs during periods when service is not needed.
3Ease of operation
If terminals use dynamic IP addresses in detached state, then user convenience is improved, but service initiation complexity increases
Solution Approach 1:
The triggering message acts as an intermediary mechanism between the user's detached state and the packet-based service session. When the triggering message is received, it mediates the transition by automatically initiating the attach procedure and obtaining an IP address from the network, thereby simplifying service initiation for the user while managing the complexity in the background.
4Reliability
If the system requires all participants to be connected before starting a session, then service reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The system sends triggering messages to all participants in advance of the scheduled session time. Each terminal independently transitions to attached state upon receiving its triggering message, ensuring all participants are connected and ready before the session begins. This automated preliminary action eliminates the need for manual connection verification while ensuring service reliability.
Data Source
AI summary
A mechanism and method for initiating a packet-based service session in a public mobile communication system, especially a service session for a group of users are disclosed. In order to accomplish a service initiation even if the terminals of the users are in a disconnected state with respect to the packet-switched domain of the mobile communication system, a triggering message is sent from one user terminal to the other terminals of the group. The triggering message includes information about a packet-based service session to be started, and it may be a message that can be sent via the mobile communication system to a mobile terminal that is in a disconnected state with respect to the packet-switched domain. In response to the reception of the triggering message, the other terminals are brought to a state allowing reception of packets belonging to the packet-based service session. When necessary, this feature involves establishing a connection from the other terminals to the packet-switched domain.