Adaptive VoIP Service QoS Control based on Perceptual Speech Quality

• Main Authors: Liang-Yi Huang, 黃良義
• Other Authors: Tien-Yaw Chung
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/66459971847072692463

碩士 === 元智大學 === 資訊工程學系 === 94 === Integrated environment of wireless network can provide a ubiquitous and continuous communication for voice over Internet Protocol (VoIP) service. However, the major problems, which VoIP performs over wireless networks, are varying delay of each packet, high packet loss rate and handoff. This thesis proposed an Adaptive QoS Playout (AQP) algorithm to offer a high quality wireless VoIP service. AQP integrates the effect of dejitter buffer control, retransmission, and handoff delay based on the E-model. Simulation results show that AQP can reduce the lateness loss rate and improve speech quality under high frame error rate when the wireless link has small end-to-end network delay and also performs well when a handoff occurs.