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The advent of Cloud has aided mobile devices in performing computation intensive tasks with the virtue of offloading. However, this leads to communication with the Cloud, which results in high energy consumption. Moreover, communication over wireless medium has the risk of intermittent connectivity with Cloud. Hence, there is an urgent need for providing a trade-off between energy consumption and...
Recently, Proxy Mobile IPv6 (PMIPv6) has been drawing attention as a mobility management protocol to effectively use the limited wireless resources. And, there have been some researches to apply PMIPv6 to multicasting, which is core technology of Internet broadcast system. However, PMIPv6 based multicasting cannot support the global mobility directly between different PMIPv6 domains because PMIPv6...
Accessing Cloud via mobile device proves to be costly because of issues with wireless network. Due to communication overhead, offloading of application execution to Cloud consumes more energy than executing in the device itself. This paper proposes a novel framework in which application execution is offloaded to both Cloud and mobile ad hoc Cloud, in order to reduce this communication overhead. Distributed/Parallel...
Recently, Proxy Mobile IPv6(PMIPv6) networks have been studied as the mobility management protocol to effectively use limited wireless resources. And the multicasting, which is a core technology of the Internet broadcast system such as mobile IPTV, has been widely discussed manly based on PMIPv6 network. However, since the PMIPv6 is basically designed for local mobility management, it cannot support...
The Proxy Mobile IPv6 (PMIPv6) have been widely studied as a mobility management protocol to effectively use the limited wireless resources. Recently, there have been some researches to apply PMIPv6 to multicasting, which is core technology of Internet broadcast system. However, PMIPv6 based multicasting has a problem in that it shows the disconnection of services during the handover because it does...
In cellular systems, a handoff process is defined to transfer an active call of an MS from one cell to another in order to provide a seamless service to this MS. Generally, a handoff decision is made based on received signal strength (RSS) values from the current base station (BS) and neighboring BSs. In the traditional mobile communication systems, measured RSS directly indicates the quality of the...
The need for managing distributed systems and providing seamless service is prominent in E-Government. SOA can potentially address those needs and provide software architecture for the interaction of existing and new distributed systems in E-Government. Through analyzing the characteristics of SOA and Web Services, Web Services is considered as the most appropriate technology for implementing SOA...
We propose enhanced agent based user mobility support mechanism in RFID networking environment. Although there is an existing study for providing user mobility, it has a problem which the handover latency time is long. To solve this problem, we present a scheme for minimizing handover latency time and compare handover latency time of existing and proposed scheme. We confirm that proposed mechanism...
This paper proposes a new mobility management (MM) scheme for seamless service in IP-based Next Generation Network (NGN). The proposed scheme supports local mobility as well as global mobility, which overcomes problems from existing schemes, such as PMIPv6 or just MIPv6. This paper verifies that the proposed scheme has lower handover latency time than the others by using numerical analysis.
Seamless handoff issues including authentications have become considerable interest in wireless networks, which support pervasive environment users. Usually the active scanning and preauthentication methods are adopted to solve the disruption in seamless services. In this paper, we propose a new preauthentication scheme based on the fast channel switching and the power saving mode (PSM) in public...
In this paper, we propose a trajectory-aware vertical handoff algorithm based on position, velocity, signaling delay and receive signal strength (RSS) of MT. In order to provide seamless service in modern heterogeneous networks, handoff of the MT should be initiated with correct timing. In our algorithm, velocity of MT is divided into two parts as radial velocity and tangential velocity. For more...
IEEE 802.16e specification adopted that a target base station (BS) transmits Fast_Ranging_IE() to the upcoming handover MS to reduce the handover interruption time. However, the handover interruption time can be increased if the MS fails to receive Fast_Ranging_IE() because the channel release time between the MS and the serving BS is increased more than the estimated handover time due to the queuing...
The development of mobile communication technologies and smart portable device has great impact on the society, which makes the ubiquitous computing and seamless service come true. However, a major challenge is that how to provide a software platform supporting personalized and context-aware services and applications. Research on universal service terminal (UST) aims at providing light-weight application...
As heterogeneous wireless networks are deployed and users need more flexible mobility services, there has been a lot of research work about interworking mechanism between widely deployed 3G network and rapidly boarded WLAN. On the other side, WiBro is newly commercialized in Korea as the next generation wireless network. WiBro is based on IEEE 802.16e and it is expected to provide enough mobility...
In multi-access network environments, interworking technologies has become a very important issue these days. This interworking would deliver optimized services to users and also benefit service providers by reducing network construction and maintenance costs. This paper proposes a cost-effective scheme for fast handoff between mobile WiMax and cdma2000 networks. The smoothly integration scheme proposed...
Vertical handoff is the switching process to provide seamless service among heterogeneous systems. An accurate estimation for utilities of target systems must precede a handoff for the efficient use of system resources. In this paper, we propose a vertical handoff decision algorithm based on the utility function to satisfy wireless QoS. Shannon's capacity is used to maximize throughput and traffic...
For seamless service, mobility should be supported in the NGN. For this, there have been many contributions, such as MIPv6, IP2, Q.MMF, IMS. In mobility area, handover latency time is the first parameter to consider. However, above all are not compared up to now. Therefore this paper presents the performance comparison of handover latency times. For this, we use NS-2 simulator. In simulation results,...
In this paper, we propose an adaptive quality of service (QoS) design approach via resource reservation and rate adaptation to support multimedia over wireless cellular networks. Three contributions of this work are: (a) an adaptive QoS model that seeks to provide QoS assurances within bounds for each packet flow and to make advance resource reservation in order to support seamless mobility, (b) a...
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