IP Multimedia Subsystem

About: IP Multimedia Subsystem is a research topic. Over the lifetime, 4398 publications have been published within this topic receiving 43698 citations.

A Review of Policy-Based Resource and Admission Control Functions in Evolving Access and Next Generation Networks

Abstract: The IP Multimedia Subsystem (IMS) adopted in the core of Next Generation Networks (NGNs) promises to make network management easier by separating the control and the transport planes. Therefore, an interface between applications and the underlying transport network has been defined that offers a dynamic and efficient management of network resources based on a policy-based resource control engine. The resulting resource management framework enables the delivery of both the existing carrier grade existing and the next generation Quality of Service (QoS) sensitive services across operator-controlled networks using heterogeneous transport technologies. This review sheds some light into the policy control layer concept and the extended nomenclature introduced by current standardization works. The approaches of international standards development organizations, such as the Third Generation Partnership Project (3GPP), the International Telecommunication Union (ITU), the European Telecommunications Standards Institute (ETSI), the WiMAX Forum, and CableLabs are reviewed and compared with each other revealing the common architectural trend. Challenges and works in progress of NGN resource management towards Fixed and Mobile Convergence (FMC) are discussed as well.

Group access to IP multimedia subsystem service

Abstract: A method of facilitating access to services of an IP Multimedia Subsystem network by user terminals located behind an access point to said network. The access point is associated with a subscription to the IP Multimedia Subsystem network. The method comprises including within an Implicit Registration Set defined for said subscription, a wildcarded Public User Identity or Public User Identity sub-domain representative of a range of Public User Identities. At IP Multimedia Subsystem registration of said access point with the IP Multimedia Subsystem network, the Public User Identities contained in the Implicit Registration Set are distributed to a Serving Call Session Control Function allocated to said access point and to a Proxy Call Session Control Function to which said access point is attached.

Local switching of calls setup by multimedia core network

Abstract: A gateway (70. 70(2). 70(3)) of a telecommunications network (20) is arranged for performing protocol signaling conversion for communicating call setup signaling to an IP Multimedia Subsystem (IMS) (40). and upon completion of call setup is arranged to route user traffic between local mobile stations (22) involved in a connection without routing the user traffic to the IP Multimedia Subsystem (IMS) (40). In an example implementation, the signaling protocol is suitable for use over an interface between a circuit switch domain core network node and a radio access network includes GSM 24.008 signaling and the signaling protocol for a IP Multimedia Subsystem (IMS) is Session Initiation Protocol (SlP) signaling. The gateway can be situated in any of several locations such as. for example, at a mobile switching center (MSC) node (60). at a base station controller node (50) of the radio access network (RAN) (24), or at a node distinct from a mobile switching center node (MSC) and a base station controller (BSC) node, e.g., at a dedicated gateway node.

Method, system, and network element for monitoring of both session content and signalling information in networks

Abstract: The invention provides a method and system for intercepting at least one session involving at least a first and a second network of different types. For interception both signalling information of the at least one session, and session content related to the same session provided in another of the first and second networks are monitored. An indication to start interception is delivered from one of the first and second networks to the other one of the first and second networks. The first network can be an IP Multimedia Subsystem, IMS, network, and the second network a General Packet Radio Service, GPRS, network.

A secure ip access protocol framework and supporting network architecture

Abstract: A protocol framework for a Secure IP Access (SIA) method, and supporting components deployed on IP hosts and IP networks. Using this method, an IP host can establish a secure data channel within an IP network over an insecure shared link while requesting IP address and networking configuration parameters from the IP network. A system administrator can implement strong access control against various attacks that an edge IP network may have to face, such as a denial-of-service attack that exhausts assignable IP addresses. This is a lightweight, scalable, and backward-compatible solution that can improve security performance for public and corporate LANs having open access such as wireless access points and Ethernet jacks.