Based on H.248 protocol and the estimation model of video subjective quality

a bandwidth allocation strategy for video communications in next generation network is presented.Then

aiming at the different change of network status

two algorithms of the bandwidth allocation are proposed

one of which is used to guarantee the QoS(quality of service)of the different classes of terminals

and the other of which is used to maximize the total video subjective quality of all the terminals.When the network status has changed worse

experimental results show that the average PSNR(peak signal-to-noise ratio)of recovery video quality can be increased by more than 15dB using the proposed algorithm.In addition

when the network status has degraded too much to guarantee the QoS of all the active terminals

the proposed bandwidth allocation algorithm can also guarantee the total video subjective quality of all the terminals as maximal as possible.