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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...
IMS (IP Multimedia Subsystem) [1] specified originally by 3GPP to support IP multimedia services for mobile users, has become the foundation for future wireless and wireline convergence. IMS aims at allowing service providers to easily deploy rich IP-based multimedia services. However, to deploy a new IMS-based service, both the network and the terminal need to evolve to implement the associated service...
Next Generation Network (NGN), is the new approach for the operators to offer a more wide range of applications and services. Meanwhile, different Next Generation Network architectures which are proposed by manufacturers cause some ambiguities in forming of this concept in telecommunication networks. Only the required functions are considered for NGN in IP Multimedia Subsystem (IMS), for convergence...
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...
The main idea of the third generation (3G) networks is to merge two of the most important communication systems: cellular networks and Internet. The IP multimedia subsystem (IMS) defined by 3GPP is a technology designed to provide robust multimedia services across roaming boundaries and over diverse access technologies. In this communication converged world, the challenging issues are security and...
Internet protocol multimedia subsystem (IMS) was introduced by the third generation partnership project (3GPP) as a horizontal application platform necessary to address the need for a new platform with unified features, common elements, quality of service, open standardized interface for all existing and future multimedia applications and services. IMS is a promising candidate to drive the telecommunication...
IP multimedia subsystem was introduced by the third generation partnership project (3GPP) to enable 3G mobile systems to provide ubiquitous cellular access to all the services that the Internet provides, with improved quality of service, appropriate charging and integration of services. For users to access the IMS services, IMS capable User Equipments are required. In this paper we present an IMS...
Mobile network operators aims are offering new services to be competitive in the telecommunications market. However, the migration cost towards the third generation (3G) network is so high. This paper presents a proposal to offer a next generation services platform based on session initiation protocol (SIP). This solution is easy to implement and its cost is relatively low. Our solution takes into...
The session initiation protocol (SIP) is the IETF signaling protocol for VoIP (voice over Internet protocol) and other text and multimedia sessions. 3GPP has begun the evolution to "all IP access" with the introduction of MSC Server-SGSN split in Release 4 and subsequent introduction of the IP multimedia sub-system (IMS) in Release 5 and 6. The long term evolution of 3GPP strives to achieve...
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