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With the projected increase of 3G network traffic in near future, telecom operators are looking for the alternative means of satisfying the data needs of mobile subscribers without scaling the existing 3G network infrastructure. Over the last decade, IEEE 802.11 network (better called as Wi-Fi network) has emerged as one of the most competitive technology for it. It can function with the macro cellular...
The communication based train control (CBTC) system is an advanced train control system. It uses high accuracy of train locating, realizes a continuous automatic train control system. DCS system plays an important role in the information interaction between ground equipment and vehicle equipment in CBTC. Based on OPNET simulation console, this paper designs a DCS network, simulates its communication...
Bandwidth management in 802.11 wireless networks is becoming the main issue that should be overcome for IP multimedia services delivery such as IPTV, VoD, VoIP, etc. In this paper, we propose an adaptive bandwidth allocation based on adaptive transmission opportunity to overcome the guaranteed bandwidth issue. This scheme allows the video stream to take up the 802.11 channel proportionally to its...
Multi-hop WLAN is convenient option to deploy tentative network while it doesn't support multi-vendor and it could be an issue to secure Internet connectivity for at tentative location. We propose wireless device which has both WLAN AP and client capabilities simultaneously. WLAN client interface doesn't have interoperability issue, and also it can be used to connect the multi-hop network to Internet...
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