Flexible Universal Networks—A New Approach to Telecommunication Services?
Wireless Personal Communications: An International Journal
Mobility management for VoIP in 3G systems: evaluation of low-latency handoff schemes
IEEE Wireless Communications
Interworking of IP multimedia core networks between 3GPP and WLAN
IEEE Wireless Communications
SIP-based vertical handoff between WWANs and WLANs
IEEE Wireless Communications
Introduction to the ITU-T NGN focus group release 1: target environment, services, and capabilities
IEEE Communications Magazine
The IMS service platform: a solution for next-generation network operators to be more than bit pipes
IEEE Communications Magazine
One-pass GPRS and IMS authentication procedure for UMTS
IEEE Journal on Selected Areas in Communications
NGN networks: a new enabling technology or just a network integration solution?
Proceedings of the 5th International ICST Mobile Multimedia Communications Conference
A mobile healthcare system using IMS and the HL7 framework
Proceedings of the 5th ACM/IEEE Symposium on Architectures for Networking and Communications Systems
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Heterogeneous networks are collections of communication platforms utilising different protocols. Heterogeneity was born by the need of operators to offer within short time many different services on the market. As a result, nowadays users communicate through collections of networks utilising different protocols, rendering service mapping from one network to another a complex issue. With the emergence of IMS and the introduction of IP and SIP protocols as a means for achieving network homogeneity, service interoperability has become even more important. With regard to this problem, the paper proposes a method for homogenising IMS networks with regard to the utilised QoS settings and charging policy. The paper explains how the method can be applied on real IMS networks for the preservation of QoS and charging records across the whole communication path and carries out a comparative analysis with performance figures obtained in real networks.