Topic
Handover
About: Handover is a research topic. Over the lifetime, 24219 publications have been published within this topic receiving 296416 citations. The topic is also known as: handoff.
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19 May 1991
TL;DR: In order to realize fast handover in both microcells and macrocells, the relationship between averaging, the received signal level comparison method, and handover detection delay was analyzed and a combined handover decision is suggested which consists of long-term averaging with a small hysteresis margin and short-term averaged with a large hysteResis margin.
Abstract: In order to realize fast handover in both microcells and macrocells, the relationship between averaging, the received signal level comparison method, and handover detection delay was analyzed. The analytical results were verified by handover simulations performed using experimental propagation data. As the criterion for accurate and stable handover in both the macrocell and the microcell, a combined handover decision is suggested which consists of long-term averaging with a small hysteresis margin and short-term averaging with a large hysteresis margin. >
107 citations
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11 May 2003TL;DR: It is concluded that a faster handoff is achievable in SIP based terminal mobility with intelligent modifications to unaltered Linux kernel.
Abstract: This paper describes the session initiation protocol (SIP) based mobility in IPv6 and its performance in our laboratory testbed. For real-time mobile multimedia communication, we use SIP for signaling protocol as well as for supporting terminal mobility. While performance study for real-time mobile communication refers to several factors and their measurements, we analyze here only the handoff delay due to node mobility. In particular, we are interested to examine the delay incurred when a mobile node moves to a new link and perform the duplicate address detection (DAD) and router selection, and analyze the delay in each case. We notice that the IPv6 Linux implementation provides substantial amount of delay during node movement, which severely affects the performance of real-time applications. Therefore, we modify the Linux kernel and compare with the unaltered one. Finally, we conclude that a faster handoff is achievable in SIP based terminal mobility with intelligent modifications to unaltered Linux kernel.
107 citations
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NEC1
TL;DR: selected network-based multimedia/video applications operating at moderate bit-rates (-0.5-1 Mbps) in ABR/AALS/TCP mode have been successfully demonstrated on the laptop PC.
Abstract: A prototype microcellular wireless ATM network (WATMnet) capable of providing integrated multimedia communication services to mobile terminals is described in this paper. The experimental system's hardware consists of laptop computers (NEC Versa-M) with WATMnet interface cards, multiple VME/i960 processor-based WATMnet base stations, and a mobility-enhanced local-area ATM switch. The prototype wireless network interface cards operate at peak bit-rates up to 8 Mbps, using low-power 2.4 GHz ISM-band modems. Wireless network protocols at the portable terminal and base station interfaces support ABR, VBR and CBR transport services compatible with ATM using a dynamic TDMA/TDD MAC protocol for channel sharing and data link control (DLC) protocol for error recovery. A custom wireless control protocol is also implemented between the portable and base units for support of radio link related functions such as user registration and handoff. All network entities including the portable, base and switch use a mobility-enhanced version of ATM ("Q.2931+") signaling for switched virtual circuit (SVC) connection control functions, including handoff. Early experiments with the WATMnet prototype have been conducted to validate major protocol and software aspects, including DLC, wireless control and mobility signaling for handoff. Selected network-based multimedia/video applications operating at moderate bit-rates (-0.5-1 Mbps) in ABR/AALS/TCP mode have been successfully demonstrated on the laptop PC.
107 citations
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TL;DR: A user mobility model has been proposed and its statistical parameters have been derived and a new technique called last useful instant (LUI) which is based on the knowledge of the maximum time within which the handover procedure must be accomplished.
Abstract: This paper deals with the performance evaluation of various resource management strategies that are suitable for low Earth orbit mobile satellite systems (LEO-MSSs). A user mobility model has been proposed and its statistical parameters have been derived. Both fixed channel allocation (FCA) and dynamic channel allocation (DCA) techniques have been considered. Moreover, in order to reduce the handover failure probability, we have assumed that interbeam handover requests which do not immediately obtain service can be queued. In particular, two different queuing disciplines have been compared: (a) the first input first output (FIFO) scheme and (b) a new technique called last useful instant (LUI) which is based on the knowledge of the maximum time within which the handover procedure must be accomplished. Implementation aspects for the LUI technique in a LEO-MSS have been discussed also in comparison with the measurement-based priority scheme (MBPS), previously proposed in the literature on this subject. The efficiency of the LUI queuing scheme as regards the FIFO technique has been investigated by simulations for both DCA and FCA techniques. An analytical approach has been also presented in order to allow the performance evaluation of the FCA scheme with different handover queuing disciplines.
107 citations
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21 Sep 1999TL;DR: This paper presents an overview of cellular IP which represents a 'third way' combining the strengths of bath approaches without inheriting their weaknesses and combines the capability of cellular networks to provide smooth fast handoff and efficient location management of active and idle mobile users.
Abstract: A number of initiatives to add mobility to the Internet and packet data services to third generation cellular systems are being considered by emerging mobile service providers as possible candidate solutions for the delivery of IP data to mobile users. Both of these two candidates have a number of shortcomings, however. Mobile IP represents a simple and scalable global mobility solution but is not appropriate in support of fast and seamless handoff control. In contrast, third generation cellular systems offer smooth mobility support but are built on complex networking infrastructure that lacks the flexibility offered by IP-based solutions. In this paper we present an overview of cellular IP which represents a 'third way' combining the strengths of bath approaches without inheriting their weaknesses. Cellular IP combines the capability of cellular networks to provide smooth fast handoff and efficient location management of active and idle mobile users with the inherent flexibility, robustness and scalability found in IP networks.
106 citations