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As the Session Initiation Protocol (SIP) becomes more and more the core of the communication networks convergence, there is urgent need to manage the critical problem of SIP service availability under extreme overload. This paper proposes a novel solution to control SIP overload. We demonstrate the efficiency of the approach compared with a well known SIP overload control algorithm. The solution builds...
Over the last years the IP Multimedia Subsystem (IMS) has continuously gained in importance as the next generation communication network. The Session Initiation Protocol (SIP) was chosen the signaling protocol for session establishment and control in IMS. Losses caused by network or server overload would cause retransmissions and delays in the session establishment and would hence reduce the perceived...
The IP Multimedia Subsystem (IMS) has been considered to be exclusive to big players of the telecommunication world. Session Initiation Protocol (SIP) has been standardized by IETF and solutions based on it have been in the market at least for a decade. It is also an essential part of the IMS, as it is the control protocol of IMS. Recent development of the Linux platform and the Open source IMS system...
Retransmission mechanism helps SIP maintain its reliability, but it can also make an overload worse. Recent server collapses due to emergency-induced call volume in carrier networks indicate that the built-in overload control mechanism cannot handle overload conditions effectively. Since the retransmissions caused by the overload are redundant, we suggest mitigating the overload by controlling redundant...
“Push-to-talk over Cellular” (PoC) which is wireless technology and is used on mobile telecom network can enable cell phones capability of one-to-many communications, as the walkie-talkie. PoC is a new potential communication service using cellular network without the defect of walkie-talkie limited communication distance. In this paper, the performance of today's PoC is evaluated,...
With the proliferation of the Internet, voice over IP and multimedia communication become more and more important. One of the protocol that facilitated this development is Session Initiation Protocol (SIP). SIP is a signaling protocol which manages the session establishment and termination. It can be based on UDP or TCP at the transport layer. In this paper, the strengths and weaknesses of SIP over...
The network mobility (NEMO) basic support protocol is an extension of mobile IP that enables an entire network to maintain the Internet connection when it changes its attachment point to the Internet. However, it gives rise to high overhead, loss packet and long delay on the network link when a network as a unity moves frequently. These problems should seriously affect the communications, real time...
Providing Quality of Service (QoS) and Quality of Experience (QoE) in connection with media data like audio or video is of key importance for the evolution of future packet-based networks. Especially in telecommunications, the subjective service quality as perceived by the end user depends amongst other parameters on the setup success rate as well as on the delay for session setup, which is measured...
IMS is the new approach adopted by 3GPP towards networks convergence. It was designed to be access independent and ubiquitous. IMS already provides personal mobility for nomadic users, but still needs to deal with service continuity within non 3GPP networks. In this paper we propose a novel hybrid mobility management scheme, based on tight cooperation between fast handovers for mobile IPv6 (FMIPv6)...
The rapid advancement of mobile communication technologies recently has led to the advent of mobile IPTV service. For a variety of multimedia services, a process of session setup using SIP (session initiation protocol) is required. However, high frame error rate (FER) of typical wireless network causes failure and delay in session setup. In this paper we propose a new scheme minimizing the session...
Session Initiation Protocol (SIP) is an application-layer signaling and control protocol for creating, modifying and terminating sessions including Internet telephone calls, multimedia distribution and multimedia conferences. Flexible, extensible and open, SIP has a complete security mechanism that allows security of both media and signaling. SIP RFC recommends the use of TLS or DTLS to provide an...
The Session Initiation Protocol (SIP) has gained momentum and is being widely used both in the Internet and Next Generation Telecommunications network as the core signaling protocol. SIP operation relies on SIP servers which are responsible for forwarding of SIP messages. It has been shown that the performance of SIP servers is largely degraded during overload conditions due to the built in message...
As a main signaling protocol for multimedia sessions in the Internet, SIP (Session Initiation Protocol) introduces a retransmission mechanism to maintain the reliability for its realtime transmission. However, retransmission will make the server overload worse. Recent collapse of SIP servers due to emergencyinduced call volume indicates that the built-in SIP overload control mechanism cannot prevent...
SIP (Session Initiation Protocol) has been widely adopted as a signaling protocol to establish, modify and terminate multimedia sessions between end-users in the Internet. SIP introduces a retransmission mechanism to ensure the reliability of its real-time message delivery. However, retransmission makes server overload worse, as indicated by the recent server crashes in the real carrier networks....
Technology of multimedia communications on network is rapidly developing today. SIP (Session Initiation Protocol), which plays an important role in 3G standards, is well applied in multimedia conferencing systems. Traditionally, most SIP-based conferencing systems have been limited in scalability due to their tightly coupled centralized structures. However, distributed conferencing based on SIP is...
The Application continuity in IMS requires Mobility Management to ensure Session having Seamless handover and small delay. As a Session Control Protocol of IMS, SIP introduces big delay and real-time handover problems. In this letter, we proposed a combination scheme of SIP and mSCTP to solve the problem of Application continuity in IMS. We presented a novel approach for the problem of Compatibility...
Simply, internet telephony is telephone network using internet as its communication media. The specific character of a telephone is its ability to make connection to the destination telephone number. So that the right term is actually internet telephony than VoIP which is more aimed to voice communication via internet, so there is no emphasizing on the ability of call directed to the destination phone...
This paper, in accordance with the authors' continuing research investigates the effect of adding extra servers in Session Initiation Protocol (SIP) signaling network on session setup delay in the IP Multimedia Subsystem (IMS). The effect of applying more than one server in reducing waiting time in each of the nodes of the system is previously investigated by the authors in and applying more servers...
Peer-to-peer mechanisms are considered as one of the key innovative and user-friendly solutions for real-time Internet communication services. Eliminating server-based architecture, reducing or eliminating configuration effort, and allowing end-user devices to bring resources into the network, will reshape the network as we currently know it. This presents substantial opportunities for networks and...
To deal with increasing number of the mobile devices and applications in the next generation all-IP wireless networks, effective mobility management has become a critical problem. In this paper, we propose a new mobility management architecture, named I-HSIP, which integrates host identity protocol (HIP) and session initiation protocol (SIP) to handle TCP and UDP applications respectively. In this...
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