Dong-Hee Kwon

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Providing multicast service to mobile hosts in wireless mobile networking environments is difficult due to frequent changes of mobile host location and group membership. If a conventional multicast routing protocol is used in wireless mobile networks, several problems may be experienced since existing multicast routing protocols assume static hosts when(More)
The routing protocols designed for wired networks can hardly be used for mobile ad-hoc networks due to unpredictable topology changes, and thus several routing protocols for mobile ad-hoc networks have been proposed. The goal of this paper is to select the most reliable route that is impervious to failures by topological changes by mobile nodes’ mobility.(More)
The IEEE 802.16e system supporting mobility on fixed wireless-MAN systems is supposed to be a mobile broadband wireless access (BWA) and evolve into 4G mobile communication systems. Although the system already defines its own mobility management algorithm, a network layer handover algorithm should be defined to support the mobility of mobile stations in the(More)
This paper presents a bidirectional data transfer protocol to improve the capacity and throughput in wireless local area networks (WLANs). By reducing the number of contentions among stations as much as possible, a large portion of time wasted for contentions can be used for actual data transfer. The approach proposed in this paper assumes a multi-rate(More)
Mobile IPv6, which is a protocol being standardized by IETF for global IP mobility support, is expected to play a key role for future all-IP wireless networks. As the demands for delay sensitive real-time applications increase, the handover latency of mobile IPv6 becomes inadequate for these applications. There have been many proposals, such as fast(More)
The increase of mobile devices is addressing a mobility support to facilitate handovers of mobile devices. Mobile IPv6 (MIPv6) has been proposed by IETF to solve this problem in the Internet. But, in MIPv6, there is a time interval that a mobile node (MN) cannot send or receive any packets during the handovers. The time interval is long enough for packets(More)
operation if the mobile host is expected to remain the network relatively long period of time, while it does not start multicast tree join operation if the mobile host is expected to remain the network relatively short period of time. The proposed protocol tries to minimize the number of unnecessary multicast tree join operations. We examined performance of(More)
With the rapid growth of mobile Internet, offering seamless connectivity and high-speed multimedia services in different types of wireless networks are important features in next generation wireless networks (4G networks). Many researchers envision that the 4G networks will consist of many radio access technologies which integrate into all IP-based networks(More)