An overview of research on QoS routing

The subject of providing QoS guarantees in packet-switched networks has been a major area of research over the past 10 - 20 years [1]. Some QoS-based frameworks have been proposed to help solve the IP quality problem. QoS routing algorithm is the critical component of these frameworks or has a good future of applying in them. To better guarantee QoS, a new QoS routing mechanism, QoS service routing (or QoSSR for the rest of the paper), appears recently. Then, the conventional QoS routing is classified as QoS data routing (or QoSDR for the rest of the paper). Several overviews on QoSDR have been published [2][3][4]. The paper differentiates itself from other overviews in that: (1) It pays much attention to future directions, such as applying QoSDR in DiffServ and MPLS, and presents a proposal for integrating QoSDR with MPLS. (2) The paper also addresses QoSSR of which there is still no overview at all.