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The wireless LAN based communication system of subway consist of a network of mobile nodes moving together in high velocity. We propose the idea of the new handover scheme based on mobile IP. The station (STA) taking the access point (AP) as the gateway, implements the multiple-hop subnet mobile IP by cooperation of the home agent, the foreign agent, interior network routing agent and reused tunneling...
The characterization of propagation mechanisms inside tunnels are important for the development of models for the planning of wireless communication systems in urban areas. This paper presents the first results of a measurement campaign conducted at 700 MHz in a 2.2 km urban tunnel. The path loss dependence with distance traveled inside the tunnel and the dispersion parameters of the channel were...
Public transportation is vital in everyday life. As a consequence, the increasing need for intelligent surveillance systems over public transportation provides promising areas for wireless vehicular communication research for in-tunnel applications. This paper particularly emphasizes on tunnel implementation regarding to a prototype surveillance system on railway environments based on autonomous,...
Media-Independent Pre-Authentication (MPA) is used as a secure handover optimization scheme working over any link layer. With MPA, a mobile node (the MN) can establish a security association with a candidate target network (CTN), obtain an IP address and other parameters from the CTN, and complete the binding update of any mobility management protocol with the new care-of address (nCoA) before performing...
Wireless broadband access for mobile applications is an area of increasing growth. An international collaboration, led by the Taiwan Industrial Technology Research Institute (ITRI), has been working to implement a dedicated WiMAX network for a user field trial on the Taiwan High Speed Rail (THSR) bullet train system. Continuous wireless coverage at train speeds up to 300 km/hr is challenging due to...
It supports only one mobile terminal to roam in wireless network using mobile IP technology. We extend one terminal to a small network, and propose ldquoroaming subnetrdquo to support network roaming while keeping data connection with huge network. In a roaming subnet, home agent, foreign agent and intra-domain routing agent cooperate instead of traditional MAC level device. Mobile node in subnet...
Being an evolution of IEEE 802.16e, IEEE 802.16j mobile multi-hop relay (MMR) is proposed to gain coverage extension and throughput enhancement. Although the IEEE standard 802.16j-2006 has not been published yet, the second version of 802.16j Draft Standard (802.16j D2) has been released in 2007. In this paper, for the first time, we evaluate the MAC performance of the Draft Standard based on the...
This paper presents a ray-tube tracing method to simulate waves propagating in curved road tunnels from base stations for mobile communications. Ray tubes are traced by including multiple reflections in the curved tunnels and diffractions from wedges of the tunnel structures, together with the direct path. To verify this ray-tube tracing approach, field measurements of 900 MHz signals in two curved...
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