Model of Intradomain QoS Estimation and Interdomain QoS Advertisement in NGN
Shaohua Yu · Journal of Chinese Computer Systems · 2007
The NGN is service-oriented and a given is bound to certain QoS parameters. The whole networks are divided into different administrative domains (also referred to as ASs). The objectives of previous research mainly focus on the QoS inside of a network, namely the process of packet flows and the corresponding resources allocation, yet more factors have to be taken into consideration in NGN. This paper raises and analyzes three problems: (1) how to select the route with max bottleneck in a network with respect to bandwidth, (2) how to, at lease to some extend, unify the three basic QoS parameters (bandwidth, delay, packet loss rate) into a single parameter(in this paper, bandwidth) and thus simplify the estimation of intradomain QoS, and (3) how to perform interdomain negotiation and advertisement. This paper puts forward a model to try to answer the three problems and the perspective is based upon per serviceinstead of per flowor per packet. Our philosophy stems from the following two considerations: firstly at the level of interdomain, the granular of per service conforms better to NGN's service-oriented paradigm; secondly from the angel of per service , one can easily build a macro model.