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Research and Implementation on QoS of VoIP System in Broadband Wireless MAN

Author: HuJianJun
Tutor: ZhouZongYi
School: Huazhong University of Science and Technology
Course: Communication and Information System
Keywords: IEEE 802.16 standard VoIP SIP Differentiated Services
CLC: TN925.93
Type: Master's thesis
Year: 2005
Downloads: 205
Quote: 1
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Abstract

With the rapid development of the wireless broadband network technology, broadband wireless network bandwidth problem is no longer to be a bottleneck on business in the broadband wireless network, thus contributing towards the development of real-time trend. As a typical real-time IP services, VoIP (Voice over IP) technology in this context has been widespread attention and considerable development. The IEEE 802.16 standard is a wireless metropolitan area network technology, it can account for a growing share of fixed, portable and mobile devices to provide broadband wireless access networks in future broadband wireless networks based on the IEEE 802.16 standard. However, many problems exist in the wireless broadband network based VoIP system, such as: the traditional implementations H.323 way complicated, poor scalability; lack of effective quality assurance mechanism; bandwidth has been defined in the IEEE 802.16 standard the reserved message and methods, but did not develop specific implementations. To solve these problems, the paper focuses on the implementation of VoIP, common scheduling policies, IEEE 802.16 bandwidth reservation mechanism study. In comparison traditional H.323 the manner and SIP implementations based on the recognized SIP-based implementations will be VoIP the mainstream in the future implementation, in order to guarantee the quality of service of the voice service into the purpose, the full consideration of the SIP protocol process characteristics, combined with the existing service quality assurance model, a comprehensive IEEE 802.16 protocol bandwidth reserved theory, various business flow classification and scheduling, in order to achieve the purpose of the guarantee the service quality of the voice service. First, the analysis of the the VoIP business prospects and current mainstream VoIP signaling protocols, to confirm the status of the SIP protocol VoIP service, focuses on the hierarchical structure and network system based on the SIP protocol VoIP system, based on the SIP agreement process to do a detailed analysis of the voice business and other business distinguish SIP tracking technology based on SIP protocol VoIP system. Secondly, several service quality assurance services model in-depth analysis, with a good distinction between model scalability, scheduling mechanism involved in the distinction between model proposed priority scheduling algorithm forwarded a guaranteed voice services. And service quality assurance mechanism, combined with the IEEE 802.16 standard, based on the analysis of two IEEE 802.16 assurance mechanisms, the use of the real-time nature better the GPSS guarantee mechanism, and an implementation program. Finally, to summarize the above content given overall VoIP systems based on the IEEE 802.16 wireless MAN standard service quality assurance solutions, and to test the system in a simulated test environment, verify the feasibility of the system. Experimental results show the rationality, feasibility and applicability of the solution. The solution will be to promote the study of the key technologies - VoIP systems service quality assurance. Thought paper can also be applied to VoIP systems based on other network. Part of the solution has been applied yet Sun Technology (China) Co., Ltd. (hereinafter referred to as the Shang

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