QPF Scheduling Scheme for Performance Improvements of Integrated Multimedia Applications over 3.5G Network

• Main Authors: Li-Chih Lin, 林立智
• Other Authors: Shin-Jer Yang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/43148492022870267537

碩士 === 東吳大學 === 資訊管理學系 === 99 === IMS can provide full IP technology platform which combines information and communications technologies to achieve the objectives of integrated multimedia service. In IMS, SIP is introduced to transmit session control signal. Currently, the session transmission time of SIP is affected by wireless channel bandwidth, Frame Error Rate (FER), message exchange volume, retransmission mechanism and other factors. In order to effectively reduce the delay time for session transmission, we have revised MAC-hs scheduling algorithm, i.e. PF and proposed QoS-based Proportional Fairness algorithm, called QPF, to combine the established session on SIP with the channel performance of wireless communication. We perform simulations with comparisons on the three KPIs of Transmission Delay, Throughput and Jitter between PF and QPF using NS-2 software tool under various multimedia application services, such as VoIP, VoD and Web. The simulation results indicate that QPF lowers 15.38% and 12.96% more than PF for VoIP Delay and Jitter, Throughput obtains more increasing by 5.13%. While the performance for VoD Delay and Jitter can be lowers by 11.11% and 7.45%, the Throughput is increased by 10.37%. Also, the Delay and Jitter for Web can be lowers by 16.22% and 8.41%, Throughput can be increased by 14.76%. Consequently, QPF can enhance transmission performance and obtain a higher utilization of system resources for various multimedia applications in wireless network.