A Research on Adaptive QoS Technology

The limitation of network bandwidth can lead to the loss of packets at the receiving end.This kind of packet loss degrades the speech quality, and causes impairments present in IP network, such as namely jitter and delay. To deal with the phenomenon that the network bandwidth changes dynamically and frequently, this dissertation presents two adaptive QoS technologies, namely dynamic speech codec and adaptive packet loss compensation strategy. During the real-time changing procedure of the bandwidth, these two technologies can dynamically adjust the loss compensation so as to guarantee QoS of the VoIP system.