A measurement-based approach for dynamic QoS adaptation in DiffServ networks

Abstract

This paper presents a practical approach to managing multimedia traffic in DiffServ network, using network monitoring feedback and control. We exploit the flexibility of multimedia traffic and process network level parameters to adapt the traffic according to the current state of the network. The latter is determined based on reports sent by bandwidth monitors installed on each node of a DiffServ Domain. The bandwidth monitors interact with a policy server which, depending on the network state, decides the policy(ies) that should be enforced by the DiffServ network. The implementation of the selected policies typically leads to accepting, remarking, or dropping the multimedia traffic entering the network. Multimedia streams may be assigned different levels of QoS, as interpreted by the marker at the DiffServ edge router and marked according to network state. To achieve such dynamic QoS adaptation for multimedia applications, we have implemented and evaluated a policy-based management system. Performance evaluation shows that multimedia applications adapt better to network conditions using our approach. q

Improving performance for multimedia traffic with distributed dynamic QoS adaptation

“…The non-optimal static management model used in DiffServ can also be improved adding a Bandwidth Broker (BB) as shown in [11][12][13][14][15]. Such an architecture may be used to integrate several domains administratively to pursue end-to-end QoS.…”

Dynamic Resource Allocation in Communication Networks

“…A policy-based architecture is presented in [3], where a measurement-based approach is proposed for dynamic Quality of Service adaptation in DiffServ networks. The proposed architecture is composed of one Policy Decision Point (PDP), a set of Policy Enforcement Points that are installed in ingress routers and bandwidth monitors implemented in core routers.…”

“…Recently, dynamic bandwidth allocation has attracted research interest and many algorithms have been proposed in the literature [1,2,3,4,5]. These approaches and related works are discussed in Section 2.…”

“…Dynamic bandwidth provisioning in Quality of Service networks has recently attracted a lot of research attention due to its potential to achieve efficient resource utilization while providing the required quality of service to network users [1,2,3,4].…”

A Novel Packet Marking Function for Real-Time Interactive MPEG-4 Video Applications in a Differentiated Services Network

“…Random Early Discard (RED) [8] is used at the input of each queue to monitor queue levels and drop traffic dependant on There has been a great deal of research investigating the benefits of using DiffServ to provide service guarantees to real-time and non real-time traffic [ 1,[6][7][8][9][10]. A few in particular have focused on dynamically modifying the DiffServ classifications or queuing configuration within the network to respond to varying network conditions [ 11,12]. The work proposed in this paper differs in that it uses knowledge of the profile of aggregated video traffic along with hop-by-hop headers to control the end-toend delay without dynamically changing the resource reservation of the traffic classes.…”