An examination of the constraints affecting VoIP quality over WiMAX-based networks.
Written in 2009; 6,955 words; 11 sources; APA; $ 156.95
Paper Summary:
This paper examines the three main components of a VoIP system - including the sender or source of VoIP data streams, the receiver or destination point, and the transmission and the network. It specifically looks at the characteristics, parameters and constraints affecting VoIP quality over WiMAX-based networks and discusses the methods designed to improve the median level of VoIP communications by optimizing voice encoding parameters and measuring their performance using R Factor and MOS. The paper includes tables and figures.
Table of Contents:
Methodology
Introduction
Problem Statement
Using MOS Measurements of VoIP Call Performance
Data Analysis Tools
Statistical Sampling of Respondents
Assumptions, Parameters of Methodology
Summary
Chapter 2
Chapter on Results
Introduction
R-Value and MOS Level Interrelationships
Compensating for Randomized Packet Loss
Summary
From the Paper:
"Increasing the voice payload size of compressed speech over VoIP-based sessions relying on static IP addresses requires even less resources per call than when DHCP-based VoIP calls are made over WiMAX-based networks. Clearly, augmenting the voice payload size with no compression still provides better resulting quality; which is a luxury on low-use networks that is, as can be seen from this study, fairly unrealistic to assume in typical configurations. This aspect of the study also shows that variation of speech encoding parameters is not efficient in the case of a single call or a relatively small portion of VoIP-based WiMAX calls. If more voice streams can be managed simultaneously through the use of MPDU routing, increasing the voice payload size provides better resulting quality in networks congested with both voice and data networks."
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