SIP Infinity Registration Reduces Signaling Overhead
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Solution Overview
Problem
Current re-registration mechanisms in SIP-based networks are resource-intensive and inefficient, leading to high signaling traffic and potential overload, especially in IMS networks where maintaining timer synchronization across multiple nodes is challenging, and there is a need for a more efficient method that reduces the burden on network resources without breaking existing implementations.
Innovation Solution
A method for infinity registration in SIP-based networks that involves initiating a registration with an infinity timer and a unique token, allowing SIP user agents to detect connection loss and initiate new registrations without periodic polling, thereby reducing unnecessary re-registration traffic and overload risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic re-registration is implemented to maintain contact validity, then contact freshness is ensured, but signaling traffic increases significantly
Solution Approach 1:
The patent replaces periodic re-registration with event-driven registration updates. Instead of forcing regular periodic actions, the system now triggers registration only when necessary (e.g., contact changes, connection loss), thereby maintaining contact freshness while dramatically reducing signaling traffic volume.
Solution Approach 2:
The UAC autonomously manages its registration state by detecting connection losses and initiating re-registration only when needed, rather than relying on periodic server-initiated refreshes. This self-service approach eliminates unnecessary periodic signaling while ensuring contact validity is maintained through event-driven updates.
2Reliability
If multiple timers are started at various nodes to maintain registration, then registration synchronization is achieved, but system complexity increases
Solution Approach 1:
The patent extracts the timer management burden from multiple network nodes (UAS, application servers) and concentrates it solely at the UAC. By removing timers from other nodes, the system achieves registration synchronization through a single point of control, dramatically reducing overall system complexity while maintaining reliability.
Solution Approach 2:
The UAC assumes multiple functions: it acts as both the registration initiator and the sole timer manager. This multi-functionality consolidates what was previously distributed across multiple nodes into a single entity, simplifying the overall system architecture while maintaining registration synchronization.
3Quantity of substance
If registration expiry timer is set longer to reduce re-registration frequency, then re-registration overhead decreases, but timer synchronization difficulty increases
Solution Approach 1:
By removing timers from UAS and application servers, the patent eliminates the synchronization complexity that would otherwise increase with longer expiry intervals. The single UAC timer operates independently without needing to coordinate with other nodes, allowing flexible expiry timing without proportional increases in synchronization difficulty.
4Quantity of substance
If infinity registration is implemented to eliminate periodic re-registration, then signaling traffic is reduced, but connection loss detection capability is lost
Solution Approach 1:
The patent introduces feedback mechanisms where the UAC monitors its own connection state and the network responds to registration failures. When connection loss is detected (through transport layer feedback or registration rejection), the system triggers appropriate re-registration actions, maintaining reliability without requiring periodic signaling.
Solution Approach 2:
The UAC autonomously detects connection losses through transport layer indicators and initiates re-registration only when necessary. This self-service approach eliminates periodic signaling while maintaining the ability to detect and respond to connection losses through event-driven mechanisms.
Data Source
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AI summary
The invention provides method for infinity registration using a Session Initiation Protocol, SIP, based communication in a Session Initiation Protocol based network, wherein the network comprises at least two or more SIP user agents and wherein each SIP user agent can act as a user agent client, UAC, when requesting a service function and as a user agent server, UAS, when responding to a request service function, the method comprising the steps of: initiating a registration, from the UAC to the UAS, wherein the registration comprises a field for indicating infinity registration capability and a field for indicating management communication capability, sending, from the UAS to the UAC, a registration expiry timer with a value equal to infinity and a management header including a onetime unique token; storing, at the UAC, the onetime unique token in combination with the registered UAC; detecting, at the UAS or UAC, whether loss of a connection between the UAS and the UAC has occurred, if a loss of the connection is detected by the UAC, the UAC initiates a new registration without any indication from the UAS, if a loss of the connection is detected by the UAS, sending, by the UAS to the UAC, a SIP message asking the UAC to initiate a new registration; sending, by the UAS to the UAC, the onetime unique token to refer to the no longer valid registration as indicated during the registration;