Mobile Terminal System Information Handling for DTM to Packet Mode Transition
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Solution Overview
Problem
In wireless communication systems, when a mobile station transitions from Dual Transfer Mode (DTM) to Packet Transfer Mode after releasing a Circuit Switched connection, it must perform a complete acquisition of system information, leading to delays and gaps in packet switching services, as existing solutions do not efficiently manage system information delivery and handling.
Innovation Solution
The method involves sending minimum system information automatically or on request to the mobile terminal to facilitate an uninterrupted transition from DTM to Packet Transfer Mode, using a packet-associated control channel for release indications and maintaining valid system information, even if the indication has not been received, to maintain packet resources and avoid service gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station performs complete acquisition of system information after releasing CS connection, then the system information is updated and reliable, but the service gap and transition time increase
Solution Approach 1:
The network sends minimum system information to the mobile station before the CS connection is released. This preliminary provision of system information allows the MS to maintain packet resources and transition to packet transfer mode without performing a complete system information acquisition after release, thereby reducing service gap while ensuring the MS has valid system information for the transition.
2Adaptability or versatility
If the mobile station releases CS connection, then the circuit switched service is terminated, but all packet resources are aborted causing service interruption
Solution Approach 1:
The network sends minimum system information to the mobile station before the CS connection is released. This preliminary action enables the MS to maintain its packet resources during the transition from dual transfer mode to packet transfer mode, avoiding the automatic abortion of packet resources that occurs in the prior art and thus maintaining packet service continuity.
3Reliability
If the mobile station performs complete system information acquisition, then the transition to packet mode is reliable, but the complexity of the transition process increases
Solution Approach 1:
The invention extracts only the minimum necessary system information from the complete system information set and sends it to the mobile station before CS connection release. This selective extraction of essential information simplifies the transition process by eliminating the need for complete system information acquisition while maintaining sufficient reliability for the mode transition.
Data Source
AI summary
A method and terminal are disclosed for use in a wireless communication system, in order for the terminal to transition from a dual mode, in which a packet switched connection and circuit switched connection are used, to a single mode in which packets are transferred. The mobile terminal is for receiving minimum system information necessary to perform this transition in an uninterrupted manner. This system information is sent to the mobile terminal automatically or on a regular basis, and is additionally sent to the mobile terminal partly upon request of the mobile terminal. A release indication is sent to the terminal separately from the system information, notifying the terminal that the circuit switched connection will be released, at which point a timer is started. The system information is employed by the mobile terminal to transition from the dual mode in the uninterrupted manner, if the timer has not expired.