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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.


Papers
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Proceedings ArticleDOI
S.T.S. Chia1, R.J. Warburton1
06 May 1990
TL;DR: Results revealed the path loss followed the inverse third to fourth power law in majority of the cases using simple regression fitting, which indicated that both RSSI and BER could be used as handover criteria, however, the optimal threshold level for handover request differed from location to location.
Abstract: 1700 MHz attenuation and bit error rate (BER) measurements were conducted at the center of a major urban area in southern England in order to compile a radio propagation and BER database for handover criteria study in city microcellular radio systems. The focus of the experiments was to provide realistic data for handover simulation in typical city microcell environments, thus minimizing inaccuracies due to the inadequacies in propagation modeling. Results revealed the path loss followed the inverse third to fourth power law in majority of the cases using simple regression fitting. The short-term signal fading statistics varied with Rice factors in excess of ten down to zero, as the distance between the mobile unit and the microcellular base station increased. Computer simulation indicated that both RSSI (received signal strength indicator) and BER could be used as handover criteria. The optimal threshold level for handover request, however, differed from location to location. >

59 citations

Journal ArticleDOI
TL;DR: An approach to the integration of WLAN and cellular networks based on loose coupling and the use of emerging mobility protocols and a method of eliminating any packet loss at the network layer during handoff is presented and evaluated.
Abstract: We review the problem of network mobility and internetworking between heterogeneous data networks and present an approach to the integration of WLAN and cellular networks based on loose coupling and the use of emerging mobility protocols. The handoff performance of such an approach is studied, at the network and transport levels, in a realistic scenario along with the impact on global performance of transport protocols. Finally, a method of eliminating any packet loss at the network layer during handoff is presented and evaluated.

59 citations

Patent
07 Jun 1995
TL;DR: In this paper, a simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system is presented.
Abstract: A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user stations communicate with one or more base stations to place and receive telephone calls, in which the user stations are provided a secure voice or data link and have the ability to handoff calls between base stations while such calls are in progress. Each base station has a set of “air channels” to which it transmits in sequence. The air channels supported by each base station are called that base station's “polling loop”. A user station receives general polling information on an unoccupied air channel, transmits responsive information to the base station, and awaits acknowledgment from the base station. Each base station may therefore simultaneously maintain communication with as many user stations as there are air channels in its polling loop. The ability of a user station to communicate on any unoccupied air channel makes the protocol air-channel agile, while the stability of user station and base station clocks may define air channels, gaps, and minor frames.

59 citations

Proceedings ArticleDOI
23 Nov 2008
TL;DR: The proposed vertical handoff decision algorithm is able to determine when a handoff is required, and selects the best access network that is optimised to network conditions, quality of service requirements, mobile terminal conditions, user preferences, and service cost.
Abstract: The integration of diverse but complementary cellular and wireless technologies in the next generation wireless networks requires the design of intelligent vertical handoff decision algorithms to enable mobile users equipped with contemporary multi-interfaced mobile terminals to seamlessly switch network access and experience uninterrupted service continuity anywhere and anytime. This paper provides an adaptive multiple attribute vertical handoff decision algorithm that enables wireless access network selection at a mobile terminal using fuzzy logic concepts and a genetic algorithm. A performance study using the integration of universal mobile telecommunications system (UMTS) and world-wide interoperability for microwave access (WiMAX) as an example shows that our proposed vertical handoff decision algorithm is able to determine when a handoff is required, and selects the best access network that is optimised to network conditions, quality of service requirements, mobile terminal conditions, user preferences, and service cost.

59 citations

Proceedings ArticleDOI
Peter Legg1, Gao Hui1, Johan Johansson1
04 Oct 2010
TL;DR: A simulation analysis of the handover performance in an LTE macro deployment, considering the impact and interdependency of key handover settings (offset, TTT, filter coefficient K) for UEs of different speeds.
Abstract: -Intra-frequency handover is an important RRM procedure in LTE and the (self-) optimization of its performance, in terms of handover reliability and handover frequency, has been studied extensively by 3GPP. We present a simulation analysis of the handover performance in an LTE macro deployment, considering the impact and interdependency of key handover settings (offset, TTT, filter coefficient K) for UEs of different speeds. Different parameter combinations giving the same handover failure rate give approximately the same handover frequency; there is scope to reduce the latter by 10 to 20% by selecting the best combination. Failures, occurring mostly in the source cell, may be reduced through careful user plane design.

59 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023338
2022759
2021511
2020816
2019824
2018865