Research Of Policy-Based QoS Management In IP Networks

All-IP-based, plenty of service and high intelligence are the important trends of future networks evolution. The DiffServ QoS model meets the demand of service differentiation, while policy-based management architecture provides high-level abstraction and intelligent deployment for services, both provide significant influence for next generation network management.IP-level QoS are configured and deployed for concrete IP network structure even equipments. As the network structure is more complicated and network size is larger, service deployment and end-to-end QoS guarantee become much sophisticated even impossible. While policy-based QoS architecture is proved to be a effective solution, which provides high-level service abstraction and defines plenty of policy distribution and configure mechanism.After an introduction of the policy-based QoS mechanisms of Universal Mobile Telecommunication System, a new policy-based QoS Framework is proposed for the next generation mobile networks. Enhanced policy management components are defined that cover the radio access networks. Hierarchical policy models with Common Open Policy Service extensions are introduced to achieve adaptive configuration of network resources and QoS negotiation. A specific case of this policy-based QoS framework is simulated. The performance results show that the required quality of service of the session can be guaranteed. It also benifits the intelligent configuration and adaptive negotiation of the QoS parameters among networks, and eventually the end-to-end QoS can be well guarenteed in the entire networks.