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Session Initiation Protocol (SIP) has been widely applied to multimedia telephony service in Broadband Converged Network (BCN). SIP is also adopted as the basic signalling protocol of VoIP and 3GPP. IP multimedia subsystem (IMS) is a SIP based multimedia telecommunication infrastructure in 3GPP. Recently, many mobile operators have selected IMS as a core infrastructure because IMS has a flexible architecture...
Session initiation protocol (SIP) has already been accepted as the multimedia control signaling standard in ubiquitous wireless network by IETF and 3GPP etc. However, the handover procedure with SIP suffers from undesirable delay for real-time multimedia applications in WLAN. Moreover, the existing handover management protocols are not sufficient to guarantee handover of VoIP session in WLAN. In this...
This paper in accordance with the authors' previous work, investigates the effect of adding extra servers in Session Initiation Protocol (SIP) signaling network on session setup in the Ip Multimedia Subsystem (IMS). The delay analysis is explored by describing the SIP signaling traffic with M/M/r notation. SIP servers overload problem is addressed and the effect of adding servers will be investigated...
The IP multimedia subsystem (IMS), originally designed by 3GPP and later updated by 3GPP, 3GPP2 and TISPAN, presents itself as an architectural framework that allows the convergence of the Internet, wireless and wireline networks and a global platform for the delivery of IP multimedia applications in next generation networks (NGN). One of the most used services to test IMS capabilities is push-to-talk...
IMS is standardised by 3GPP as a control domain inside UMTS core network, that provides support for IP based multimedia services while SIP is used as the main signalling protocol. UMTS network needs to find QoS requests of IP multimedia session through signalling protocol before it reserves resources for communication. Therefore it is necessary to enable interworking between SIP protocol and IP QoS...
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