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Train accidents continuously occur due to a variety of causes (carelessness by the conductor, broken wheels, disaster during train movements, etc.). To prevent train-related accidents in advance, it is considered the monitoring train systems with wireless sensor networks (WSNs). In this paper, we propose an efficient algorithm to dynamically configure WSNs-based trains for relaying sensing data via...
A lot of research have been done in wireless sensor networks (WSNs) based on IEEE 802.15.4. However, there is no study that the status of a device is monitored by the PAN coordinator in the IEEE 802.15.4 technology in order to reduce radio resource wastage. In this paper, we propose a procedure that the PAN coordinator can detect that the operation of a device is well. Therefore, we can utilize radio...
Recently, a lot of studies have been done in wireless sensor networks (WSNs) based on IEEE 802.15.4. While a sensor device transmits data to a PAN coordinator via a coordinator, the failure of radio communications may be occurred between a coordinator and a PAN coordinator. A coordinator may conclude that it has been orphaned and then perform the orphan scan procedure which is specified in IEEE 802...
Wireless sensor networks (WSNs) have been widely applied to a various areas. Especially in recent years, there has been an increasing interest in the adoption of emerging sensing technologies for a railway infrastructure monitoring. However, because the wireless communication of a railway is operated between sensor devices in poor environments such as high speed and much vibration, there may be a...
This paper describes the design and implementation of MBS (multicast & broadcast service) server for mobile IPTV service in WiMAX networks. Based on interoperability requirements of WiMAX networks, the presented MBS server was implemented for mobile IPTV services and basically provides MBS service announcement and session management functions, dynamic MBS zone management, and MBS data transmission.
The pre-configured MBS permutation zone should not be used for unicast services but only used for MCBCS in the current WiMAX standard. The BS does not have any MS, the BS shall multicast or broadcast MCBCS for macro diversity. This may be caused radio resource waste. To solve the problem, we propose the procedures that MCBCS Controller/Server can configure a dynamic MBS zone with BS information received...
To support multimedia broadcast service over a WiMAX network, MCBCS(Multicast Broadcast Service) is specified in WiMAX Rel-1.5. In phase-1 of WiMAX Rel-1.5, only multicast transport for MCBCS between BS and MS was specified but dynamic switching support between unicast and multicast transport for MCBCS is not specified. Therefore, we propose an efficient scheme to support dynamic switching according...
In order to overcome the drawbacks and combine the advantages of both 3G packet-switched mobile communication systems and WLAN, wireless broadband Internet (WiBro) system based on 2.3GHz bandwidth and IEEE 802.16e developed in Korea. Recently, the new version of WiBro system, named WiBro-evolution (WiBro-EVO) system which provides higher performance and various multimedia services, is being developed...
In order to overcome the drawbacks and combine the advantages of both 3G packet-switched mobile communication systems and WLAN, wireless broadband Internet (WiBro) system based on 2.3 GHz bandwidth and IEEE 802.16e has been developed in Korea. Recently, the new version of WiBro system, named WiBro-evolution (WiBro-EVO) system which provides various multimedia services, is researched. In this paper,...
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