An Advanced Model for Scheduling in SIP Proxies

J. Stadler and I. Miladinovic (Austria)


Scheduling in SIP, Emergency Calls, Weighted Queuing,Parser, Remote Interactions, Transmission Queue


Next Generation Networks (NGN), like the Universal Mobile Telecommunication System (UMTS), are expected to provide the end user with a wide range of new services. Instant Messaging, Presence, and Event Notification are very important representatives. New forms of communication require signaling protocols with extended functionality. Therefore, the Session Initiation Protocol (SIP), used for call control purpose in UMTS, has been designed to enable these kinds of user interaction. Estimations indicate that signaling traffic will increase noticeable for this reason in the next years. As a consequence, real time related signaling, as used for voice- or video call set-up, has to compete with these non real-time related messages, traversing the same network entities. Applying scheduling disciplines to these components can help to improve the signaling delays, what is of importance for real-time related messages, especially for emergency calls. This paper improves a weighted queuing model for SIP proxies by considering most important architecture parts like the message parser, the location database, or the transmission queue. Simulative investigations are used to evaluate the improvements.

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