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With the ever increasing penetration of IP technologies and the tremendous growth in wireless data traffic, the wireless industry is evolving the mobile core networks towards all IP technology. The 3 rd Generation Partnership Project (3GPP) is specifying an IP Multimedia Sub-system (IMS) in UMTS Release 5/6, which is adjunct to the UMTS Packet Swit...
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Context 1
... though only signalling traffic is simulated, traffic models are implemented and accounted for the period of time a user is using a particular service. Figure 1 presents the functional architecture of the IMS as defined in the UMTS Release 5/6. However, this model does not provide the representative physical model that is required to represent delays realistically, therefore a more practical realisation is proposed here. ...
Context 2
... hierarchical model presents multilayer or multilevel processes that characterise the different levels existing behind the packet service. Figure 10 shows those different levels of granularity (session, packet connection and packet) as described in the ETSI packet data model and generally adopted for data services modelling such as the world wide web. An IM session consists of several files down/upload. ...
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Within the GSM/UMTS framework, the IP multimedia
subsystem (IMS) will deliver rich multimedia and
conversational voice to the end-user. A common
understanding is, that initially the voice component of an
enriched voice call will be delivered through the CS network,
but integrated into the overall IMS framework. This enables
operators to offer enhan...
Within the UMTS framework, the IP multimedia subsystem (IMS) will deliver rich
multimedia to the end-user including conversational voice. The focus is to enrich the voice
communication experience with other media components, and to build on existing, wellknown
user behavior. Initially, the voice component is likely to be delivered via CS
bearers, b...
Citations
... 3G utilizing the IMS paved the way for TV Everywhere, the concept of watching video content over the wireless medium. 3G also added the Session Initiation (SIP) Protocol [32]. SIP protocol enables users to access the Internet offering the process to initiate, control, and terminate an Internet session. ...
This paper prosed a novel 6G QoS over the future 6G wireless architecture to offer excellent Quality of Service (QoS) for the next generation of digital TV beyond 2030. During the last 20 years, the way society used to watch and consume TV and Cinema has changed radically. The creation of the Over The Top content platforms based on Cloud Services followed by its commercial video consumption model, offering flexibility for subscribers such as n Video on Demand. Besides the new business model created, the network infrastructure and wireless technologies also permitted the streaming of high-quality TV and film formats such as High Definition, followed by the latest widespread TV standardization Ultra-High- Definition TV. Mobile Broadband services onset the possibility for consumers to watch TV or Video content anywhere at any time. However, the network infrastructure needs continuous improvement, primarily when crises, like the coronavirus disease (COVID-19) and the worldwide pandemic, creates immense network traffic congestions. The outcome of that congestion was the decrease of QoS for such multimedia services, impacting the user’s experience. More power-hungry video applications are commencing to test the networks’ resilience and future roadmap of 5G and Beyond 5G (B5G). For this, 6G architecture planning must be focused on offering the ultimate QoS for prosumers beyond 2030.
... 183 Progress, PRACK), and we add Application Servers to the signaling path. Pous, Pesch, and Foster [8] also used a simulator to estimate end-to-end signaling delays in a SIP-based UMTS network. They proposed optimizations to improve response times, like using SIP compression and integrating IMS elements in the same node. ...
The Third Generation Partnership Project (3GPP) specified the IP Multimedia Subsystem (IMS) standard. This standard uses the Session Initiation Protocol (SIP) to setup and teardown multimedia sessions through a potentially large cha in of proxies. The IMS standard allows some core elements to be deployed as transaction stateful or stateless proxies. Moreover , SIP standard allows proxies decide when to store transaction inf ormation on a per request basis. In this paper, we examine the implementation of the se core IMS proxies. We propose an algorithm that determines fo r each incoming request when to store transaction informat ion. The goal of this algorithm is to increase throughput by reducing the number of transactions without compromising call setup times. Our algorithm uses information such as the incoming SIP request, CPU usage, and the number of retransmitted messages. We have implemented this algorithm in our IMS simulation tool. The results show that the system throughput c an be improved by as much as 46%.
... In [11,13], the authors investigate the impact of signaling messages lost or congestion on services that rely on signaling sessions such as SIP/IMS services. They introduce signaling delay as Quality of Service (QoS) parameter and investigate the possible sources of such delay, the requirements and solutions for efficient SIP transfer through wireless networks. ...
Presence service is one of the most important IP Multimedia Subsystem (IMS) services which allow the user to express their availability and willingness to communicate with each other. Several studies have shown that Call Session Control Function (CSCF) may become the bottleneck in the IMS network, but when a crucial IMS service presence service (PS) is combined with the web services (WS), the number of bottlenecks may change or may shift to some other node. In this paper, simulation results have been presented which shows that when PS and WS are combined together then AS and WS may become the performance bottlenecks. The simulation results are then analyzed and compared with the theoretical analysis and they show a good agreement with it. A solution to improve the performance and to eliminate the bottlenecks has been suggested through this paper.
Todaypsilas mobile satellite systems are built to support a packet switched all IP communications infrastructure based on IP multimedia subsystem (IMS) leveraging the benefits of solutions already available in terrestrial networks. IMS technology provides a SIP based open platform that enables operators to introduce multimedia applications quickly and in a cost effective manner. Although IMS is very well suited for terrestrial IP networks, it is challenged by high propagation delay satellite environment with low data rates to provide equivalent levels of quality of experience enjoyed by subscribers of circuit switched systems. In this article, we first provide an overview of Circuit Switched and IMS Packet Switched based call flows for mobile satellite systems. We then concentrate specifically on voice call setup time and show how Circuit Switched architecture provides significantly better performance. Lastly, we propose several advancements on SIP call signaling to improve the IMS Packet Switched call setup times.
This research is carried out to develop IP Multimedia Subsystem (IMS) based Mobile Mass Examination (MoMEx) System. MoMEx system is intended to improve on management of examination process for large number of examinees. IMS based application is considered to be the next generation mobile applications that enable developers to take advantage of mobile networks resources. IMS-based application is attributed with robustness and improved Quality of Experience (OoE) for mobile users. Such quality is needed to ensure users reliabilities on the system. In This paper, we cover the analysis and design phase of MoMEx system. We have designed set of questionnaires aimed to gathering insights how much the concept of mobile exam and assessment will be accepted among the students and faculty members. Based on the results obtained, we concluded the functional requirements of MoMEx system prior to implementation phase.
There is an increasing trend of accessing multimedia and web services embedded with Presence service over the mobile, which have driven the telecom operators to look for the new and better ways to provide such services. Presence service puts a lot of load on the IMS network and it can contribute 50% or more to the total signaling load which can increase end-to-end delay. In this paper we have analyzed the time needed to update presence information between IMS network and Web services and also proposed the way to minimize the delay by sending messages to all Web services at the same time.
Next-generation wireless systems are expected to support efficient IP-based terminal and personal mobility. Novel mobility-support architecture called integrated MIP–SIP is designed based on the integration of mobile IP (MIP) and session initiation protocol (SIP), which dynamically combines and leverages the advantages of both protocols in a cost-effective way. The design motivation and methodology is to make full use of standardized work from both protocols, select composite processes that are more efficient for common functions, integrate similar entities and procedures to reduce redundancies, and avoid further duplicate standardization. By these means, the system efficiency can be greatly improved. The essential mobility procedures presented are applicable to both MIPv4 and MIPv6, though IPv6 is focused on. Both analytical and simulation results show that the proposed architecture outperforms existing hybrid MIP–SIP and pure SIP mobility approaches in terms of a clear-cut reduction in mobility signalling loads, which is crucial to the resource management in wireless networks. Copyright © 2006 John Wiley & Sons, Ltd.
Presence information was the key enabler to the great success of instant messaging applications. First, this information was limited to simple binary states such as online, offline or busy. However, this is, currently, evolving towards a much more generic, flexible concept to include all context that allows users or applications to adapt and control communications in a more efficient and personalized manner. Presence paves the way for the deployment of advanced communication services and is therefore a key component in the Next-Generation Networks (NGNs). These networks aim to unify fixed and mobile networks in order to provide users with global connectivity to always-on multimedia services. The main barrier to the implantation of next-generation presence-based services is the great amount of traffic involved in the distribution of presence information across domains. We study two strategies described in IETF drafts and one novel solution for reducing inter-domain presence traffic. We present the analytical formulas that calculate the traffic for the three strategies. Building on the analytical results, we analyze the factors that have impact on these strategies and study the suitability of each one under different conditions.
