Generalised analysis of a QoS-aware routing algorithm

Abstract

Modem communicatians services have strict quality of service (QoS) quiremenis, with separate eonstrsinb on bandwidth, delay and error tolerance. The task of finding a mute through a network satisfying multiple QoS constmiits is intractable, but increasingly important for modern atmmuniestions apptications. This paper investigates an appmximate algorithm, which has p-ously been analysed for the w e of two constraints, and presents a generalisation of this analysis to the m e of an srbihary number of constraints. The bloeliing rate of this algorithm is then empirically compared to several other techniques

Approximation Algorithm for QoS Routing with Multiple Additive Constraints

“…2(c) illustrates the approximated supported QoS defined by RP 2 . We can see that W 1 A,G (•) and W 2 A,G (•) define different supported QoSes.…”

An efficient quality of service routing algorithm for delay-sensitive applications

“…Korkmaz et al [19] proposed an algorithm that can dynamically adjust the values of a and b within a logarithmic number of function calls to DijkstraÕs shortestpath algorithm. Andrew and Kusuma [25] extended JaffeÕs algorithm to the case with more than two constraints. Iwata et al [24] proposed a polynomial-time algorithm to solve the MCP problem.…”

Distance-Vector QoS-Based Routing with Three Metrics

“…Second, the composition rule of this function is hard to define since the composition rules of its parameters are different. Nevertheless, the single mixed metric is used in many proposals [16,19]. This approach does not guarantee each QoS requirement individually, but adjusting the metric weights in the overall cost may increase the importance of a particular requirement.…”

“…First, they may suppose centralized routing, i.e., the router knows the entire topology [19,20]. This is true for LS routing but not for DV routing.…”

“…The algorithm in [19,20] uses one metric to find a path, and then it tests if this path respects the other QoS requirements. If not, it uses another metric as the routing decision factor, and so on.…”