The Third Generation Partnership Project (3GPP) has adapted the Internet-Protocol Multimedia Subsystem (IMS) as a service delivery platform for the Next Generation Networks (NGN). IMS offers multimedia services over Internet Protocol (IP) based infrastructure. These services require a mechanism to manage Quality-of-Service (QoS). The current 3GPP QoS standards are based on Policy Based QoS Management architecture which provisions QoS in a single IMS domain, but users may be located in different IMS domains, or roaming between deferent IMS domains. This raise issues regarding management of QoS across IMS domains. In this paper we will identify these issues in the current IMS Policy Based QoS Management architecture and propose a mechanism for Inter-domain QoS management based on the IMS platform.
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