Multi-SIM Handover Signaling for Inactive SIM Context Transfer
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Solution Overview
Problem
In 5G NR networks, communication processes involving terminals with multiple SIM cards in different states (connected and inactive) are complex, leading to increased resource occupation and time consumption due to separate handling of SIM card handovers and context information transfer.
Innovation Solution
A method where context information of an inactive SIM card is sent through a connected SIM card during handover, optimizing the process by reducing separate communications and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate handling is performed for SIM card handover and context information transfer, then communication reliability is maintained, but communication complexity and resource occupation increase
Solution Approach 1:
The patent merges the handover signaling process with context information transfer by embedding the context information of the first SIM card within the handover signaling messages. Specifically, the source base station includes the inactive SIM card's context information in the handover required signaling sent to the core network, and the target base station receives this context information in the handover request signaling, eliminating the need for separate context transfer procedures.
2Loss of information
If separate handling is performed for SIM card handover and context information transfer, then information completeness is ensured, but time consumption and resource occupation increase
Solution Approach 1:
The patent combines multiple information transfer operations into a single signaling exchange. The context information of the first SIM card is transmitted along with the handover signaling for the second SIM card through the same message paths (handover required signaling from source base station to core network, and handover request signaling from core network to target base station), reducing the number of separate communication rounds and minimizing time consumption.
3Adaptability or versatility
If multiple SIM cards are handled separately in different states, then individual SIM card management is maintained, but communication resources are excessively occupied
Solution Approach 1:
The patent makes the handover signaling mechanism universal by enabling it to carry both handover commands for the connected SIM card and context information for the inactive SIM card simultaneously. The existing signaling paths are extended to serve multiple functions: managing the connected state SIM card's handover while also transferring context for the inactive state SIM card, thereby reducing overall resource occupation without sacrificing individual SIM management flexibility.
Data Source
AI summary
The present disclosure provides an information sending method, including in response to determining that a second SIM card in a connected state satisfies a handover condition for handing over the second SIM card from a first base station to a second base station, sending context information of a first SIM card to the first base station through the second SIM card, wherein the first SIM card is in an inactive state. According to the technical solutions of the present disclosure, the first SIM card does not need to send the context information to the second base station separately, nor temporarily adjust its state, thus the times of communication between the terminal and the base station are reduced, the communication progress is simplified and the communication resources are saved.