In order to improve the QoS for multimedia application

which focused on the delay-constrained and jit-ter-optimized traffic allocation problem in multipath routing.First of all

based on the network calculus theory

a deep analysis on the upper bound of delay in the single route transmission was dore

and deduce the upper bound formulation of delay and jitter in multiple route transmission

and find out the maximum income rate satisfying the delay constraint for a route.Then

based on the upper bound of delay and jitter

a delay-constrained and jitter-optimized traffic allocation algorithm DCJOTA was proposed

which distributes the traffic to a route in proportion to its maximum income rate

and does some adjustment to optimize the jitter.At last

the implement methods of DCJOTA were given to run in NS2

and simulation is done.Experimental results show that the DCJOTA embedded multipath routing protocol DCJO-AOMDV outperforms AOMDV at the term of end-to-end delay and jitter.Compared with AOMDV

DCJO-AOMDV has made the end-to-end delay and jitter decreased by 3.9% and 24.5% respectively.But

DCJOTA puts a litter complexity on the rout-ing protocol

which leads to the network throughput decreased by 1.7% in DCJO-AOMDV.