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The defense date of the thesis is 2011-02-14
The current date is 2019-03-20
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URN etd-0211111-131539 Statistics This thesis had been viewed 1619 times. Download 3 times. Author Hsin-Hui Huang Author's Email Address No Public. Department Electrical Engineering Year 2010 Semester 1 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 80 Title PERFORMANCE EVALUATION OF VOICE OVER DIFFERENT QUEUES ON WIMAX Keyword NS-2 QoS IEEE802.16 WiMAX VoIP VoIP WiMAX IEEE802.16 QoS NS-2 Abstract In the services of wireless network, we seek the best capacity. In this paper, based on the goal of making the simulation corresponding with the actual network operation situation, this research executes the simulation on the platform of NS2 to simulate WiMAX network which is very close to the actual PMP and discuss how to achieve the usage rate of the maximum system capacity for specific web application service on the condition of multiple users sharing the bandwidth.
Parameters in this simulation are as follows: 1ms transmission delay time, 1Mbps bandwidth, OFDM_QPSK_3_4 modulation and DSDV Routing protocol, other parameters that are not defined are used with default values which are put in the ns-default.tcl file. The standard of assessing the communication quality sets the delay time as 150ms and the loss rate as 3%. Different background types would impact the best capacity. Per our simulation results, the capacity of FTP background is more 3 than the one of CBR background. And the capacities would be also different between immovable and movable conditions. Finally, the best capacity of G729 would be much more than G711.
If VoIP users are immovable, DRR is the best queue for CBR background and FQ is the best one for FTP background. If VoIP users are movable, RED is the best queue for FTP background. Under G729 codes, FQ is the best queue no matter Delay, Loss Rate, and MOS.
Advisor Committee Teng-Pin Lin - advisor
Files Date of Defense 2011-01-24 Date of Submission 2011-02-14