Mobile Station Dual Transfer Mode Transition
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Solution Overview
Problem
Current GSM networks require time-consuming transitions from packet transfer mode to dual transfer mode, forcing mobile stations to idle packet switching capabilities during circuit switching session setup, leading to inefficient service quality for packet applications.
Innovation Solution
Employing a radio link control or multiple access control message using a packet associated control channel to request or convey a dual transfer mode assignment command, maintaining packet switched resources and eliminating the need for idle modes, thereby enabling faster access to circuit switching resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station follows the current standard procedure to transition from packet transfer mode to dual transfer mode, then the circuit switched connection can be established, but the packet resources must be aborted and the mobile station must idle packet switching capabilities during the transition, resulting in time-consuming delays and reduced service quality
Solution Approach 1:
The mobile station sends a packet CS request message while still in packet transfer mode, initiating the circuit switched connection setup process before actually transitioning to dedicated mode. This preliminary action allows the network to prepare CS resources while PS resources remain active, eliminating the idle period and reducing overall transition time.
Solution Approach 2:
The invention maintains packet switched resources continuously active during the transition to dual transfer mode, rather than aborting and re-establishing them. The mobile station keeps PS capabilities operational throughout the CS connection setup process, ensuring uninterrupted packet data transmission and eliminating service quality degradation.
2Ease of operation
If the mobile station aborts packet resources to establish a circuit switched connection, then the CS connection can be set up, but the mobile station must perform complete acquisition of system information and request PS resources again, increasing device complexity and transition time
Solution Approach 1:
The mobile station initiates the CS connection setup by sending a packet CS request message while remaining in packet transfer mode, rather than first transitioning to dedicated mode. This preliminary action simplifies the overall procedure by eliminating the need to abort and re-acquire PS resources, reducing both transition time and procedural complexity.
3Reliability
If the mobile station idles packet switching capabilities during circuit switching session setup, then the circuit switched connection can be established, but the quality of service for packet applications deteriorates due to the idle period
Solution Approach 1:
The mobile station maintains packet switched resources continuously active during the entire CS connection setup process. By keeping PS capabilities operational and not entering an idle state, the invention ensures uninterrupted packet data transmission and maintains service quality throughout the transition to dual transfer mode.
Data Source
AI summary
A mobile terminal and method are disclosed for use in a wireless communication system in order for the mobile terminal to be able to transition to a dual mode, in which a packet switched connection and circuit switched connection are used together, from a single mode in which packets are transferred. A packet associated control channel is used to convey a radio link control or multiple access control (RLC/MAC) message, and meanwhile packet switched resources are maintained. Then a dual transfer mode assignment message is received, as a result of using the packet associated channel to convey the radio link or multiple access control message.