Proxy-Call Session Control Function Restoration in Mobile Networks
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Solution Overview
Problem
User equipment (UE) remains unaware of a P-CSCF service outage until its next scheduled registration update, leading to delayed connectivity and degraded user experience for voice or video calls due to the delay in detecting a malfunctioning proxy-call session control function in mobile networks.
Innovation Solution
Implementing a system where an application server receives an indication of UE registration with a first proxy node, triggers proxy node restoration through a subscriber information node and management node, and establishes a data traffic session with a second, functioning proxy node upon detecting the unavailability of the first node, thereby ensuring earlier re-registration with a properly functioning node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE registration with P-CSCF is performed on a predetermined interval (e.g., hourly), then UE battery drain and network traffic are balanced, but the delay between P-CSCF service outage and UE detection of the outage increases
Solution Approach 1:
The network proactively detects P-CSCF service outages and triggers UE re-registration before the UE's scheduled registration update occurs. The system monitors P-CSCF availability and initiates restoration procedures in advance, so when a P-CSCF fails, the UE is already notified and can switch to an alternative P-CSCF without waiting for the next periodic registration interval.
2Loss of energy
If UE waits for next scheduled registration update to detect P-CSCF failure, then network signaling overhead is reduced, but connectivity-dependent functionality (voice/video calls) is degraded
Solution Approach 1:
The system implements a feedback mechanism where the network continuously monitors P-CSCF service availability and provides real-time status information to UEs. When a P-CSCF is detected as unavailable, the network sends notifications to registered UEs, triggering immediate re-registration with alternative P-CSCFs. This feedback loop ensures connectivity functionality is maintained without requiring excessive periodic registration signaling.
3Use of energy by moving object
If periodic registration interval is extended to reduce battery drain, then UE power consumption decreases, but the window of service unavailability increases
Solution Approach 1:
The network performs self-monitoring of P-CSCF service availability and automatically manages UE re-registration without requiring frequent UE-initiated registration updates. The system uses existing network infrastructure and signaling to detect outages and trigger restoration procedures, allowing extended registration intervals while maintaining service availability through network-side proactive management.
Data Source
AI summary
Solutions for providing a data traffic session with proxy-call session control function (P-CSCF) restoration include: receiving an indication, by an application server (AS), that a user equipment (UE) is registered with a first proxy node; receiving, at a subscriber information node, from a call session control function (e.g., over an N70 interface), a first message triggering proxy node restoration; based on at least receiving the first message triggering proxy node restoration, transmitting, by the subscriber information node, to a management node, a second message triggering proxy node restoration; receiving an indication, by the AS, that the UE is registered with a second proxy node different than the first proxy node; and based on at least receiving a session initiation message, establishing the data traffic session for the UE with the second proxy node.