Dynamic Resource Allocation for Packet Loss Differentiated Services in VPN Access Links

With the increasing deployment of IP/MPLS VPN services, their QoS control mechanisms on the core network have been extensively studied in the literature. Unfortunately, satisfying requirements of QoS in VPN access links is missing, where lots of small and medium businesses (SMB) or future home networks usually purchase a fixed and limited bandwidth connection to the external network. When more and more users and traffic in the group need to share the limited resource, the access link is becoming the critical factor to affect customers´ QoS. This paper tries to provide a low-cost and practical solution to approach the QoS control issue. Specifically, it measures the on-line traffic and dynamically controls the bandwidth usage for each traffic class towards guaranteeing a quantitative packet loss parameter. First, the traffic is differentiated into several classes according to a packet loss probability parameter. Then the statistic QoS parameter is guaranteed by dynamically allocating the appropriate bandwidth for each single class. The numeric results are obtained from the live NCIT*net2 network and demonstrate it is practicable and effective in the real application.