Preemptive mobile assisted and guard channel based handoff queuing scheme
01 Dec 2011-pp 1-4
TL;DR: A preemptive scheme which uses channel reservation for handoff requests as well as allows ongoing non-real time calls to be preempted by real-time handoff calls arriving in the network is discussed.
Abstract: Mobility is an important aspect of any time, any where next generation wireless communication networks. Handoff supports this mobility of the users and allows them to move from one cell to another without service interruption or degradation and in true sense makes a user mobile. Handoff failure results in forced termination of an ongoing call so the handoff requests need to be prioritized over originating call requests. This paper discusses a preemptive scheme which uses channel reservation for handoff requests as well as allows ongoing non-real time calls to be preempted by real-time handoff calls arriving in the network. Handoff decisions are assumed to be Mobile-Assisted and hence calls are handed over to Base stations with good-quality signals. Markov chain model of the proposed scheme has been designed and dropping and blocking probabilities of the calls arriving at the network have been computed.
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01 Jan 2013
TL;DR: A mobile traffic simulator that automates the testing of the mobility behavior of the simulated UEs by automating the user's interaction with the UEs.
Abstract: Most mobile traffic simulators of today depend on the user to supply the mobility behavior of the simulated UEs. This becomes a problem when certain wanted mobility characteristics are to be tested ...
3 citations
Cites background from "Preemptive mobile assisted and guar..."
...The Handover decisions[26] can be classified into Mobile Controlled Handovers, Mobile-Assisted Handovers and Network-Controlled Handovers....
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References
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Book•
15 Jan 1996
TL;DR: WireWireless Communications: Principles and Practice, Second Edition is the definitive modern text for wireless communications technology and system design as discussed by the authors, which covers the fundamental issues impacting all wireless networks and reviews virtually every important new wireless standard and technological development, offering especially comprehensive coverage of the 3G systems and wireless local area networks (WLANs).
Abstract: From the Publisher:
The indispensable guide to wireless communicationsnow fully revised and updated!
Wireless Communications: Principles and Practice, Second Edition is the definitive modern text for wireless communications technology and system design. Building on his classic first edition, Theodore S. Rappaport covers the fundamental issues impacting all wireless networks and reviews virtually every important new wireless standard and technological development, offering especially comprehensive coverage of the 3G systems and wireless local area networks (WLANs) that will transform communications in the coming years. Rappaport illustrates each key concept with practical examples, thoroughly explained and solved step by step.
Coverage includes:
An overview of key wireless technologies: voice, data, cordless, paging, fixed and mobile broadband wireless systems, and beyond
Wireless system design fundamentals: channel assignment, handoffs, trunking efficiency, interference, frequency reuse, capacity planning, large-scale fading, and more
Path loss, small-scale fading, multipath, reflection, diffraction, scattering, shadowing, spatial-temporal channel modeling, and microcell/indoor propagation
Modulation, equalization, diversity, channel coding, and speech coding
New wireless LAN technologies: IEEE 802.11a/b, HIPERLAN, BRAN, and other alternatives
New 3G air interface standards, including W-CDMA, cdma2000, GPRS, UMTS, and EDGE
Bluetooth wearable computers, fixed wireless and Local Multipoint Distribution Service (LMDS), and other advanced technologies
Updated glossary of abbreviations and acronyms, and a thorolist of references
Dozens of new examples and end-of-chapter problems
Whether you're a communications/network professional, manager, researcher, or student, Wireless Communications: Principles and Practice, Second Edition gives you an in-depth understanding of the state of the art in wireless technologytoday's and tomorrow's.
17,102 citations
"Preemptive mobile assisted and guar..." refers methods in this paper
...Pb= ∑ P i, j, 0 + ∑ P i, j, 0 + ∑ P i, c i, k M (5) (11)...
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...We can write the dropping and blocking probabilities as equations (4) and (5): Pd = ∑ , , + α ∑ , 0, (4)...
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TL;DR: A taxonomy of channel assignment strategies is provided and the complexity in each cellular component is discussed, and the required intelligence distribution among the network components is defined.
Abstract: A taxonomy of channel assignment strategies is provided, and the complexity in each cellular component is discussed. Various handover scenarios and the roles of the base station and the mobile switching center are considered. Prioritization schemes are discussed, and the required intelligence distribution among the network components is defined. >
494 citations
"Preemptive mobile assisted and guar..." refers methods in this paper
...Using these values α can be computed by equation (1)....
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...It can be seen that α = (λhr + λnr)/( λhr + λnr + λhn + λnn) (1)...
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TL;DR: Different and novel aspects of handoff are presented and handoff related issues of fourth generation systems are discussed and desirable handoff features are presented.
Abstract: As mobile wireless networks increase in popularity and pervasiveness, we are faced with the challenge of combining a diverse number of wireless networks. The fourth generation of wireless communications is expected to integrate a potentially large number of heterogeneous wireless technologies in what could be considered a huge step forward toward universal seamless access. One of the main challenges for seamless mobility is the availability of reliable horizontal (intrasystem) and vertical (intersystem) handoff schemes. Efficient handoff schemes enhance quality of service and provide flawless mobility. This article presents different and novel aspects of handoff and discusses handoff related issues of fourth generation systems. Desirable handoff features are presented. Handoff decisions, radio link transfer, and channel assignment are described as stages of the complete handoff process. A vertical handoff decision function, which enables devices to assign weights to different network parameters, is also presented
377 citations
"Preemptive mobile assisted and guar..." refers methods in this paper
...We can write the dropping and blocking probabilities as equations (4) and (5): Pd = ∑ , , + α ∑ , 0, (4)...
[...]
TL;DR: The design enhancements have produced a set of highly efficient schemes that achieve significant reduction in handoff blocking rates while only incurring remarkably small increases in the new call blocking rates.
Abstract: We propose and evaluate new schemes for channel reservation motivated by the rapidly evolving technology of mobile positioning. The schemes, called predictive channel reservation (PCR), work by sending reservation requests to neighboring cells based on extrapolating the motion of mobile stations (MSs). A number of design enhancements are incorporated to minimize the effect of false reservations and to improve the throughput of the cellular system. These enhancements include: (1) reservation pooling; (2) queuing of reservation requests; (3) hybrid approach for integrating guard channels (GCs); and (4) using a threshold distance (TD) to control the timing of reservation requests. The design enhancements have produced a set of highly efficient schemes that achieve significant reduction in handoff blocking rates while only incurring remarkably small increases in the new call blocking rates. The PCR approach has also been used to solve the MINBLOCK optimization problem and has given significant improvement over the fractional guard channel (FGC) protocol. Detailed performance results of the different variations of the PCR scheme and comparisons with conventional channel reservation schemes are presented. An analytical Markov model for the hybrid predictive version of the scheme is developed and its applicability and numerical results are discussed.
238 citations
TL;DR: A comprehensive survey of the basic elements, the different types and phases of the handoff procedure and particular interest has been given in the horizontal handoff execution phase by discussing and classifying the most recent handoff prioritization schemes into categories based on the concepts that these schemes adopt.
Abstract: Handoff is a key element in wireless cellular networks in order to provide quality of service (QoS) to the users and to support users' mobility. Handoff failure will result in the forced termination of an ongoing call. From the user's point of view, the service of a handoff request is more important, as the forced termination of an ongoing call is more annoying than the blocking of new calls. Therefore, in order to support QoS to the users and to provide ubiquitous coverage, the handoff procedure ought to be further investigated. This paper provides a comprehensive survey of the basic elements, the different types and phases of the handoff procedure. Moreover, particular interest has been given in the horizontal handoff execution phase by discussing and classifying the most recent handoff prioritization schemes into categories based on the concepts that these schemes adopt, e.g. channel reservation, handoff queueing, channel transferred, subrating, genetic and hybrid schemes and in the vertical handoff decision phase by presenting different decision algorithms.
142 citations