RRC State Transition Timer for Multi-Network Switching
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Solution Overview
Problem
In mobile communication systems, when a user equipment (UE) prioritizes communication with a second network over a first network, it may experience delays in switching from the first network to the second network due to the inability to autonomously transition to an RRC inactive state without receiving necessary configuration information from the first network.
Innovation Solution
A communication apparatus and method that includes a communicator and a controller, which receive first information for setting a timer for transitioning the RRC connected state and transmit second information to indicate an RRC state transition, allowing the UE to transition to an RRC idle state upon timer expiration, thereby preventing delays in switching to the second network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for configuration information from the first network before transitioning to RRC inactive state, then the transition process is controlled and reliable, but communication switching to the second network is delayed
Solution Approach 1:
The network provides timer configuration information in advance to the UE before the UE needs to transition to RRC inactive state. This preliminary provision of timing parameters enables the UE to autonomously determine when to transition without waiting for network confirmation, thus resolving the contradiction between reliable control and switching speed.
2Speed
If the UE transitions to RRC idle state autonomously without network configuration, then switching speed is improved, but the transition control reliability deteriorates
Solution Approach 1:
The invention changes the control parameter from requiring explicit network confirmation to using pre-configured timer parameters. The network provides timer configuration information that enables the UE to autonomously transition to RRC inactive state based on timer expiration, achieving both fast switching and reliable control through parameter-based automation.
3Reliability
If the UE maintains RRC connected state in the first network while communicating with the second network, then connection reliability is maintained, but unnecessary communication overhead occurs
Solution Approach 1:
The network pre-configures timer parameters to the UE before the UE needs to transition to RRC inactive state. This allows the UE to autonomously transition to RRC inactive state when needed, maintaining connection reliability through proper timer control while avoiding unnecessary communication overhead by not maintaining RRC connected state during second network communication.
Data Source
AI summary
A communication apparatus configured to communicate with a plurality of networks by using a plurality of subscriber identity modules comprises a communicator and a controller. The communicator is configured to receive, from a network included in the plurality of networks, first information for setting a value of a timer relating to transition of a radio resource management (RRC) connected state, and transmit, to the network, second information to be used to indicate an RRC state transitioning from the RRC connected state. The second information can indicate an RRC inactive state as the RRC state. The controller is configured to start the timer on the basis of transmission of the second information, and cause the RRC state to transition to an RRC idle state on the basis of expiration of the timer.