Umts Data Services Qos Guarantee Mechanism

The 3rd mobile communication system provides various services to users. With the increase of requirement on services, the Quality of Service (QoS) has become one of the most important targets of the system, specially the real time service has the most rigorous requirement on the capability of network and system. IETF put forward two models for QoS. One is Integrated Services (IntServ), which guarantees the QoS exactly by resource reservation. The other is Differentiated Services (DiffServ), which is simple and expandable. On the comparation of two models, IntServ model is applied to access network while DiffServ model is applied to core network in UMTS. And the mechanism to guarantee the QoS on UMTS network is proposed, focuse on the realization of end-to-end QoS framework. In the framework, function of protocol on each layer is discussed, and also considers the charateristics of ATM network. Such work processes as the negotiation of QoS, the modification of QoS and the renegotiation of QoS when users perform inter-region handover are described in detail. Finally, the result is present by testing work process and the QoS of services. And do a summarization on the development of UMTS network, which gives important referrence to resource management and programing for the network in the future.