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Standardisé par le 3GPP, 3GPP2, groupe TISPAN de l’ETSI, OMA, ... Architecture IMS 8 A la manière de l’approche NGN, l’architecture IMS reprend une approche en couches.Structurée en quatre couches fondamentales : Accès Transport Contrôle et session Service et application Architecture IMS 9 Architecture IMS 10 couche Accès : renferme tout type d’accès haut débit comme WLAN, UTRAN, x DSL, etc.The total delay in a call set up/release procedure is the summation of the delay of the nodes along the signaling path.
We concluded that which one node would be the bottleneck depends on how the traffic is distributed in the networks.
We did the delay analysis firstly by describing the SIP signaling traffic with M/M/1 notation.
When IMS was deployed, it was as a complete offering delivered entirely by a single large equipment vendor and at price points that simply didn’t make sense.
Let’s face it, IMS is important - but to the network operator.
Not only was it an infrastructure investment whose costs were hard (or impossible) to pass onto a subscriber, but classic deployment techniques were marred in the complexity and limits of custom hardware, proprietary software, archaic licensing and convoluted trial, roll-out and scaling techniques.