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Vol. 172, Issue 6, June 2014, pp. 51-60

 

Bullet

 

A Wireless LAN and Voice Information System for Underground Coal Mine
 

1, 2 Yu Zhang, 1 Wei Yang, 3 Dongsheng Han, 4 Young-Il Kim

1 School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, P. R. China
2 Faculty of Information Technology, Beijing City University, Beijing 100083, P. R. China
3 School of Electrical & Electronic Engineering, North China Electrical Power University, Hebei Baoding 071003, China
4 Electronics and Telecommunication Research Institute, Daejeon, 305-700, Korea
1 Tel.: +86-10-51682162, fax: +86-10-51682162

1 E-mail: yuzhang@bcu.edu.cn

 

Received: 24 March 2014 /Accepted: 30 May 2014 /Published: 30 June 2014

Digital Sensors and Sensor Sysstems

 

Abstract: In this paper we constructed a wireless information system, and developed a wireless voice communication subsystem based on Wireless Local Area Networks (WLAN) for underground coal mine, which employs Voice over IP (VoIP) technology and Session Initiation Protocol (SIP) to achieve wireless voice dispatching communications. The master control voice dispatching interface and call terminal software are also developed on the WLAN ground server side to manage and implement the voice dispatching communication. A testing system for voice communication was constructed in tunnels of an underground coal mine, which was used to actually test the wireless voice communication subsystem via a network analysis tool, named Clear Sight Analyzer. In tests, the actual flow charts of registration, call establishment and call removal were analyzed by capturing call signaling of SIP terminals, and the key performance indicators were evaluated in coal mine, including average subjective value of voice quality, packet loss rate, delay jitter, disorder packet transmission and end-to- end delay. Experimental results and analysis demonstrate that the wireless voice communication subsystem developed communicates well in underground coal mine environment, achieving the designed function of voice dispatching communication.

 

Keywords: Underground coal mine, Wireless Local Area Networks (WLAN), Wireless-Fidelity (Wi-Fi), IEEE 802.11b, Voice over IP (VoIP), Session Initiation Protocol (SIP).

 

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