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Research of Voice Scheduling System Based on MANET

Author: XuLiang
Tutor: WenHong
School: Hunan University
Course: Applied Computer Technology
Keywords: Mobile Ad hoc voice scheduling system OLSR SIP Asterisksoft switching
CLC: TN929.5
Type: Master's thesis
Year: 2013
Downloads: 15
Quote: 0
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Abstract


Traditional voice scheduling system using wireless LAN or publicmobile telephone network for voice traffic, which needs to deploy awireless repeater node and relies on the existing different formats ofmobile communication facilities.Its application scope is limited, andoperation cost is higher.Voice dispatch system constructing byMANET,which is flexible,stable,supporting user mobility and ease ofdeployment.It is widely used in factory scheduling scenario,medicalrelief,temporary communications or other fields.The focus of this paper isrouting protocol that is used in voice dispatch system based onMANET.Except that,hardware and software of dispatch terminals areincluded.The main contents including:1．Researching MANET medium access control protocols, VoIPprotocol analysis and voice data transfer mechanism framework,placingemphasis on SIP and Asterisk softswitch.2．Improved OLSR is proposed based on ETT(ExpectedTransmission Time) in order to solve suboptimal routing issue.Byimproving Metric calculation method,setting ETT threshold to suppressunnecessary routing updates.Experimental results show that the protocolin terms of reliability and latency aspects are improved.3．The paper uses ARM platform combining audio processing,WIFI modules to build voice dispatch system hardware terminal.Terminalincludes upper UI interface, liblinphone dynamic libraries, OLSR routingprotocol, device drivers and so on.Voice dispatch system transmissionperformance and voice effects are tested in actual scenes.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
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