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Defined by the 3GPP, the IP multimedia subsystem (IMS) is an architectural framework that enables the delivery of multimedia services in mobile networks. Based on the session initiation protocol, the IMS offers unified billing, QoS negotiation mechanisms, and the possibility of combining services deployed in different environments like CAMEL and Parlay OSA. With the aim of determining the real limitations...
The policy and charging control function is defined as PCC (policy and charging control) by 3GPP and SBBC (service based bearer control) by 3GPP2. It is valuable to establish an experimental testbed for PCC and SBBC to improve and verify the related performance. At present, we can make use of open source IMS (OSIMS) and UCT PCF to simulate 3GPP PCC, but there is no testbed for the policy control function...
Billing, charging and accounting are the most critical operational support activities for any telecommunications network operator. Through these activities operators recover costs for service provision, and make business profits. IMS charging is required at the services level as well as the transport level. In networks with QoS guarantees, it is necessary for user preferences of service quality levels...
The IMS (IP multimedia subsystem) control infrastructure aims at integrating QoS management functionality into IP services networks. The present contribution explores the approach enforced by 3GPP standards in this respect and describes implementation results in realistic scenarios based on the DiffServ model.
The IP multimedia subsystem (IMS) has been standardized to offer multimedia services over an internet protocol (IP) based infrastructure. These services require different quality-of-service (QoS) classes, hence the importance of providing QoS services through seamless interconnection networks is fueling an increasing interest in the next generation network (NGN). A critical issue regarding deployment...
The third generation network which is vigorous nowadays will be followed by an all-IP infrastructure referred to as Next Generation Networks (NGN) in the near future. More specifically, the IP Multimedia Subsystem (IMS) is the only standardized way to offer IP based services that are enabled by one common core and all types of access networks and devices. The heterogeneity and mobility of the IMS...
As IMS becomes more available to academia and industry, the requirements for IMS clients are growing faster than ever. From all IMS components, IMS clients are vital components for the success of overall services provided by the IMS. Most of ongoing research is focusing on adding more services on clients side, none has been done for voice over Internet protocol (VoIP) quality adaptation so far. Since...
In this work we present a model for online charging of media-rich services supporting dynamic QoS negotiation, within the third generation partnership project (3GPP) IP multimedia subsystem (IMS) emulated environment. In the QoS negotiation process a user, a network provider, and a service provider negotiate about the session to be initiated, resulting in an user-specific combination of media components...
Although IMS (IP multimedia subsystem) brings a large set of new services and offers service convergence, it introduces complexity on network procedures and architecture. This paper focuses on IMS session establishment procedure and highlights the long delay introduced by this procedure. It also raises failure problems encountered when only partial radio resources are available for the requested service...
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