Multi-SIM Paging Overlap Resolution via AMF Notification
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Solution Overview
Problem
In 5G mobile communication systems, terminals with multiple Subscriber Identity Modules (SIMs) face challenges in monitoring and managing paging occasions from multiple networks simultaneously, leading to issues such as missed mobile terminated services and inefficient resource utilization due to overlapping paging occasions and lack of information about incoming services from other networks.
Innovation Solution
A method and apparatus for a terminal and network nodes to manage communication based on multiple SIMs, involving registration requests, PDU Session activation, and Non-Access Stratum notifications to provide caller ID information and service type details, allowing the terminal to determine whether to receive services from overlapping networks effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal monitors paging occasions for multiple PLMNs simultaneously, then the terminal can receive mobile terminated services from all registered networks, but the paging occasions of different PLMNs may overlap causing the terminal to monitor only one PLMN at a time
Solution Approach 1:
The patent segments the paging monitoring function by introducing a paging occasion determination unit that separately calculates paging occasions for each PLMN based on their respective parameters (T, n, SF0, SF). This segmentation allows the system to handle multiple PLMN paging occasions independently and identify overlaps systematically, resolving the contradiction between monitoring multiple networks and managing monitoring complexity.
Solution Approach 2:
The patent introduces a paging occasion determination unit as an intermediary component that acts as a mediator between the multiple PLMN paging systems and the terminal's monitoring capability. This intermediary calculates and compares paging occasions for different PLMNs, identifies overlaps, and determines which PLMN to prioritize, thus resolving the conflict between simultaneous monitoring requirements and single-monitoring-capability constraint.
2Reliability
If the terminal receives service from one PLMN, then the service quality is ensured, but the terminal cannot perform monitoring for other PLMNs during that time
Solution Approach 1:
The patent applies preliminary action by determining and comparing paging occasions for all registered PLMNs in advance, before the terminal actually receives services. The paging occasion determination unit calculates potential overlaps and establishes a priority scheme beforehand, allowing the terminal to maintain service quality from the active PLMN while being prepared to switch to monitoring other PLMNs when needed, thus resolving the contradiction between service quality and multi-PLMN adaptability.
3Loss of information
If the terminal recognizes only that MT service occurred in a PLMN, then the terminal knows service status, but the terminal does not know information about the MT service such as caller's phone number
Solution Approach 1:
The patent applies universality by designing a notification message structure that serves multiple functions simultaneously: it identifies the PLMN where service occurred, provides detailed service information (caller ID, SMS originator), and enables the terminal to make informed decisions about service acceptance. This multi-functional notification mechanism resolves the contradiction between providing complete service information and managing information complexity.
4Device complexity
If the terminal monitors only one PLMN at a time during overlapping paging occasions, then the terminal reduces monitoring complexity, but the terminal misses mobile terminated services from other PLMNs
Solution Approach 1:
The patent implements feedback through a priority determination mechanism that continuously evaluates the current state of paging occasions and service reception. When an overlap is detected, the system uses the established priority scheme to determine which PLMN to monitor, and this decision can be adjusted based on service importance, user preferences, and current network conditions. This feedback loop resolves the contradiction between reducing monitoring complexity and maintaining service reception reliability.
Data Source
AI summary
One disclosure of the present specification provides a method by which an AMF node of a first network performs communication on the basis of a plurality of SIMs. The method comprises the steps of: receiving a registration request message from a terminal through a base station of the first network; receiving, from an SMF node of the first network, a first message including information requesting the activation of a PDU session of the terminal; receiving a second message that includes caller's ID information related to downlink data; and transmitting, to the terminal, a paging message or a non-access stratum (NAS) notification message including the caller's ID information through the base station of the first network.