Shared RRC Connection for Multi-SIM Service Concurrency
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Solution Overview
Problem
In multi-SIM multi-standby terminals, efficient service concurrency is hindered by TX preemption, leading to inefficient network switching and camping, especially when one SIM card occupies the primary channel, causing the other to release resources and enter an idle state.
Innovation Solution
A communication method that manages air interface resources through a common RRC connection, allowing multiple SIMs to share and reuse the connection for concurrent service registration and communication, enhancing efficiency by associating contexts and establishing shared security configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one SIM card occupies the primary channel for communication, then communication reliability of the first SIM is improved, but the other SIM card must release resources and enter idle state, causing service concurrency to deteriorate
Solution Approach 1:
The patent divides the primary channel resources into separate dedicated channels for each SIM card. Instead of one SIM occupying the entire primary channel at a time, the system creates multiple independent communication paths, allowing simultaneous active connections for multiple SIMs without resource preemption.
Solution Approach 2:
The patent makes the primary channel serve multiple functions by enabling it to simultaneously support communication for multiple SIM cards. The channel is designed to handle concurrent data services for different SIMs, transforming it from a single-function resource to a multi-functional resource that maintains active state for multiple subscriptions.
2Adaptability or versatility
If the terminal device performs network searching and camping for the second SIM card, then network coverage capability is improved, but communication efficiency deteriorates due to resource release and state transition
Solution Approach 1:
The patent performs network searching and camping for the second SIM card in advance, before it is needed for communication. By completing the network attachment process beforehand while the primary channel is available, the system ensures that when the second SIM needs to communicate, it is already camped on a suitable cell and can immediately utilize the primary channel without causing the first SIM to enter idle state.
Solution Approach 2:
The patent maintains continuous active communication state for the primary channel by coordinating network operations. Instead of allowing periodic interruptions for network searching and camping that force idle transitions, the system ensures continuous useful action by completing all necessary network procedures during periods when the channel is not needed for active data transmission, thereby maintaining uninterrupted service concurrency.
Data Source
AI summary
Communication methods and related devices are described to manage an air interface resource through a common radio resource control (RRC) connection of different cards in a multi-SIM multi-standby terminal and implement service concurrency of the multi-SIM multi-standby terminal. In an example method, after setting up an RRC connection for communication between a first network and a terminal device, an access network device receives, from the terminal device through the RRC connection, a registration request message that requests to register with a second network, and sends the registration request message to a core network device in the corresponding second network. Then, after the access network device receives a registration response message from the core network device, the access network device sends the registration response message to the terminal device, to complete a process in which the terminal device registers with the second network.