Consolidated SIP Registration for IMS Applications on UICC
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Solution Overview
Problem
In mobile communication systems, the current methods for SIP registration are costly in terms of battery life and network load, and result in unnecessary signaling due to unawareness of IMS applications and communication services on the UICC at device boot-up, leading to extra registrations and unsolicited messages.
Innovation Solution
The introduction of new ISIM and USIM files to inform mobile equipment of IMS applications and communication services at boot-up, allowing for consolidated SIP registrations and updates through notifications, reducing unnecessary signaling by managing IARI and ICSI registrations efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile equipment performs multiple SIP registrations to ensure all IMS applications and communication services are registered, then the reliability of IMS service delivery is improved, but the network load and signaling overhead increase
Solution Approach 1:
The patent implements preliminary action by having the mobile equipment query the UICC for IARI and ICSI information during the initial boot-up phase, before any SIP registration occurs. This allows the device to compile a complete list of all IMS applications and communication services in advance, enabling a single comprehensive SIP registration that includes all necessary service information, thereby avoiding multiple subsequent registrations and reducing overall signaling overhead while maintaining complete service coverage
2Loss of information
If the mobile equipment performs multiple SIP registrations to discover UICC IMS applications, then the completeness of service registration is improved, but the battery consumption increases
Solution Approach 1:
The patent applies preliminary action by implementing the UICC query mechanism at boot-up, where the mobile equipment retrieves all IARI and ICSI information before performing SIP registration. This single preliminary query operation replaces what would otherwise require multiple registration attempts and service discovery procedures, thereby ensuring complete service registration while minimizing battery consumption through a single information retrieval operation rather than repeated communication cycles
3Adaptability or versatility
If the mobile equipment sends unsolicited SIP messages to register new services, then the adaptability to new IMS applications is improved, but the network load increases
Solution Approach 1:
The patent implements preliminary action by having the mobile equipment proactively query the UICC for all IARI and ICSI information during boot-up, before any SIP registration or service announcement occurs. This allows the device to compile a complete service inventory in advance and include all services in a single SIP registration message, eliminating the need for subsequent unsolicited SIP messages to announce new services, thereby maintaining full adaptability to IMS applications while significantly reducing network load from service announcement traffic
Solution Approach 2:
The patent implements feedback by establishing a query-response mechanism where the mobile equipment queries the UICC for service information and receives IARI and ICSI data in response. This feedback loop ensures the mobile equipment has accurate, up-to-date information about all IMS applications and communication services available on the UICC, enabling it to perform comprehensive registration in a single operation and adapt to the full range of available services without needing to send multiple probing messages
Data Source
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AI summary
To consolidate session initiation protocol (SIP) messages a user equipment (UE) is made aware of all Internet Protocol (IP) multimedia subsystem (IMS) applications installed in its memory and on a universal integrated circuit card (UICC) and supported communication services. By obtaining this information before the initial IMS Registration, the UE can save resources by registering all local applications and communication services in single IMS registration.