SIP Session Establishment During HSS Outage
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Solution Overview
Problem
3GPP network node outages can lead to communication channel failures, causing devices to be unable to establish or maintain connections until the outage is resolved, which becomes increasingly difficult with integrated new network generations and diverse devices, resulting in network downtime and resource inefficiencies.
Innovation Solution
The system determines HSS outages during SIP session establishment and bypasses the unavailable HSS by modifying terminating messages to send them to candidate S-CSCFs, allowing the SIP session to be established even during HSS outages, thereby reducing network downtime and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system waits for HSS outage resolution before establishing SIP sessions, then network stability is maintained, but network downtime increases and service availability deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism that allows SIP session establishment to proceed through alternative routing paths when HSS is unavailable. The system uses pre-configured fallback routes and alternative authentication methods that bypass the blocked HSS path, enabling service continuity during outages without compromising overall network stability
Solution Approach 2:
The system performs preliminary actions by pre-configuring alternative routing paths and fallback authentication mechanisms before HSS outages occur. When an outage is detected, these pre-prepared alternatives are immediately activated, eliminating the need to wait for HSS recovery and thereby reducing network downtime
2Reliability
If the system implements comprehensive outage detection and rerouting mechanisms, then service availability improves, but device complexity and processing overhead increase
Solution Approach 1:
The patent implements a universal outage handling framework that serves multiple functions: detection, decision-making, routing, and authentication. This multi-functional approach consolidates what would otherwise require separate complex systems into a single integrated mechanism, improving service availability while controlling complexity through functional consolidation
Solution Approach 2:
The system employs feedback mechanisms where outage detection triggers automated rerouting decisions, and successful session establishment provides feedback that validates the alternative path. This closed-loop control enables reliable service continuation while keeping the complexity management systematized and predictable rather than ad-hoc
3Reliability
If the system attempts multiple rerouting attempts during HSS outage, then service continuity improves, but resource consumption and processing overhead increase
Solution Approach 1:
The patent applies partial action by implementing a limited number of predetermined rerouting attempts rather than exhaustive or continuous retry mechanisms. The system performs just enough alternative routing attempts to establish service continuity, then stops, avoiding excessive processing that would consume additional resources during already-stressed outage conditions
Data Source
AI summary
Systems may establish a Session Initiated Protocol (SIP) session during a Home Subscriber Server (HSS) outage. The systems may include Network Functions (NF) that perform steps for establishing the SIP session and/or bypassing the HSS experiencing the outage. For instance, an Interrogating (I)-Call Session Control Function (CSCF) may modify a terminating message received from a User Equipment (UE) to generate a modified terminating message, and send one or more instances (e.g., forks) of the modified terminating message to one or more candidate Serving (S)-CSCFs. A particular S-CSCF of the candidate S-CSCFs may comprise the registered S-CSCF and may respond to an instance of the modified terminating message. In some embodiments, the I-CSCF may establish the SIP session by sending an instance of the modified terminating message to a designated S-CSCF. The designated S-CSCF may determine which candidate S-CSCF comprises the registered S-CSCF, for instance, by querying the candidate S-CSCFs.