In this paper

we propose a QoS(Quality-of-Service)-guaranteed multipath routing policy in MPLS(Multiple protocol label Switching) networks. The key idea is traffic dispersion throughout the network

so that the load of the network can be balanced and call admission ratio is increased while user-required QoS being guaranteed. We first discuss the decomposition and allocation issues of end-to-end QoS constraints on paths. Based on these analyses

we present the traffic dispersion path selection strategy used by multipath routing

and also investigate the critical parameter

K

's effect on the performance of above path selection strategy. Numerical results show the effectiveness of multipath routing in traffic dispersion

load balancing

and call-admission-ratio improvement. We also conclude that the

advantage of using multipath routing becomes more obvious as the users' requests for network resources get stricter.