A dynamic admission control scheme in a DiffServ domain

Abstract

Gaining lessons from the IntServ/RSVP experience, more simplified Differentiated Services(DiffServ) has emerged as the core network architecture with enhanced scalability for implementation and deployment. The DiffServ architecture handles the IP level QoS in addition to the traditional best effort service, and it leaves higher complexity to edge than to core nodes and the interior nodes do not care per-flow processing. To provide services in a DiffServ domain, it is necessary to provision resources appropriately in the control or management path functions of the DiffServ domain in addition to the data path service protocols implementation. So far, a great deal of IP-level QoS research has been conducted on the data plane issues, but little research has been reported on the control or management plane issues. Resource provisioning consists of admission control and resource allocations with configurations along the edge-to-edge traffic path. While the quantitative traffic designates egress point so that static provisioning may be sufficient for it, qualitative traffic does not specify egress points so that the qualitative traffic cannot be assumed to follow specific routes with the same degree of predictability as quantitative traffic. Thus, the qualitative provisioning is more difficult to support, and the provisioning parameters should be estimated based on the accurate traffic characteristics, which can be obtained from possibly real time measurements. This thesis aims to resolve dynamic resource provisioning, especially for the qualitative traffic by measurement-based admission control scheme having some signaling component via control plane DSCPs. The proposed scheme has been simulated on the ns-2 simulator, using traffic with burst characteristics. The results shows that the proposed scheme has the capability to support a fine-grained, dynamic admission control with flexibility in DiffServ domain.