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Application Research on Self-adaptive Speech Coding Used in the Next Generation Network

Author: LinBo
Tutor: TanJianHao
School: Hunan University
Course: Control Theory and Control Engineering
Keywords: VoIP Quality of service Next-Generation Network Softswitch Media Gateway Control Protocol Adaptive
CLC: TN912.3
Type: Master's thesis
Year: 2005
Downloads: 115
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Abstract


With the development of packet networks , telecom operators are facing increasingly fierce competition . In order to improve their competitiveness , they must not only optimize the existing voice network , but also in the data on the network to carry more business . In order to solve this problem , the next-generation network (NGN: Next Generation Network) based softswitch system came into being . With the perfection of the various protocols of NGN and NGN deployment of NGN development has become an inevitable trend. However , the current NGN There are a lot of problems do not get solved, such as the security and quality of service (QoS: Quality of Service) , etc. . This article conforms to the development trend of NGN , NGN network and softswitch for clues , NGN and the quality of its services are discussed . First , from the principle of next generation network architecture and its core components - Softswitch analyzes , major research the NGN framework and hierarchy as well as softswitch speech coding , voice processing technology and softswitch media gateway control agreement. Then discussed in detail under the framework of such a network call quality issues as well as the cause of the problem , call quality and NGN network performance parameters corresponding relationship , found that the lack of the root causes of poor call quality of service bearer network bandwidth . Therefore proposed a way to improve the QoS adaptive speech coding strategy , application software based on the real-time status of the network to select a different voice coding to improve network QoS . Finally , under the control of the softswitch , Media Gateway Control Protocol H.248/MeGaCo control media gateway . Experiments show that this strategy can improve the network quality of service to a certain extent . The NGN service quality is imperative. Modify speech coding to improve the quality of service from the application layer through though not completely solve the problem of quality of service , but it can be used as the other strategies auxiliary way . This algorithm insufficient network bandwidth its superiority also help to reduce the load on the router . Particularly for always limited bandwidth wireless communication , the advantages of the adaptive algorithm is particularly evident.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Electro-acoustic technology and speech signal processing > Speech Signal Processing
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