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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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Patent
24 Feb 2004
TL;DR: In this paper, various handoff schemes for inter-system handoff from a UTRAN to a cdma2000 radio access network (RAN) are described. And the handover is accomplished by a handoff execution procedure.
Abstract: Various schemes for performing inter-system handoff, eg, from a UTRAN to a cdma2000 radio access network (RAN) are described For a MAHHO scheme, the UTRAN uses measurements obtained by a multi-RAT device to determine suitable cdma2000 cell(s) for handover The measurements are obtained by a candidate frequency search procedure, and the handover is accomplished by a handoff execution procedure For a MDHHO scheme, the UTRAN relies on location information for the multi-RAT device to select suitable cdma2000 cell(s) for handover For a CRHHO scheme, a new call is established on the cdma2000 RAN and the pending call on the UTRAN is released in a manner such that the handover appears seamless to the multi-RAT device The multi-RAT device includes two modem processors that perform processing for the UTRAN and cdma2000 RAN and an application processor that controls the modem processors

114 citations

Patent
04 Mar 2005
TL;DR: In this paper, the authors proposed an approach for transmitting quality of service (QoS) information of a target base station (13) for admitted service flows during a handover operation.
Abstract: The present invention is related to transmitting quality of service (QoS) information of a target base station (13) for admitted service flows during a handover operation. The invention comprises providing a service to a mobile station (11) from a serving base station (12) and receiving at the serving base station (12) a handover request (S107) from the mobile station (11). The serving base station (12) then provides a handover notification (S108) to a target base station (13), wherein the handover notification comprises a QoS parameter associated with the service. The serving base station (12) then receives from the target base station (13) a handover notification response (S109), wherein the handover notification response comprises service level prediction information that is determined in response to the QoS parameter associated with the service. Finally, the serving base station (12) provides a handover response (S110) to the mobile station (11), the handover response comprising the service level prediction information.

114 citations

Patent
09 Aug 2001
TL;DR: In this paper, a handover method in wireless telecommunication system supporting uplink synchronous transmission scheme (USTS) is disclosed. And the handover of a mobile station in an asynchronous WET system supporting USTS, includes the steps of: a) performing a mode conversion of the mobile station from the USTS mode to a non-USTS mode based on a first signal measurement result from the mobile stations; and b) performing handover for the mobile Station.
Abstract: A handover method in wireless telecommunication system supporting USTS is disclosed. The method for performing a handover of a mobile station in an asynchronous wireless telecommunication system supporting an uplink synchronous transmission scheme (USTS) mode, includes the steps of: a) performing a mode conversion of the mobile station from the USTS mode to a non-USTS mode based on a first signal measurement result from the mobile station; and b) performing a handover for the mobile station. In another embodiment of the present invention, the method further includes the step of: c) performing a mode conversion from the non-USTS mode to the USTS mode based on a second signal measurement result from the mobile station.

114 citations

Patent
Aleksandar Damnjanovic1
06 Jun 2008
TL;DR: In this article, a configurable criterion for radio link failure (RLF) is established through a reference threshold for a channel quality metric; the threshold (CQITH) can be determined at least on a quality-of-service basis or a per-terminal basis.
Abstract: System(s) and method(s) are provided for forward handover under radio link failure. A configurable criterion for radio link failure (RLF) is established through a reference threshold for a channel quality metric; the threshold (CQITH) can be determined at least on a quality-of-service basis or a per-terminal basis. A low-overhead indication of RLF is conveyed as a NULL CQI when the channel quality metric is below threshold. Onset of RLF triggers preparation of forward handover (FHO) at a terminal within a predetermined timer, during which normal service can resume if link quality recovers above CQITH. Forward handover is pursued once timer elapses. Preparation at the terminal can be complemented by preparation implemented in advanced to RLF condition, in accordance to a disparate threshold applied to terminal's measurements. Preparation of FHO includes backhaul exchange of operational information like buffered data, and context.

114 citations

Proceedings ArticleDOI
17 Nov 2002
TL;DR: A performance analysis of the current IETF proposals, namely, the hierarchical Mobile IPv6 architecture and the fast-handoff mechanism, shows through simulation that managing the registration process in a hierarchical fashion greatly reduces the overall handoff latency.
Abstract: Mobile IPv4 has been considered as the de facto standard in providing Internet mobility. However, as the demand for wireless mobile devices capable of executing real-time applications increases, it is necessary to provide superior handoff latency and quality of service (QoS). Mobile IPv6 is designed to resolve these issues, and has numerous applicable optimization techniques. Two ways of reducing the handoff latency, in both IPv4 and IPv6, have been proposed in the literature. One aims to reduce the (home) network registration time while the other aims to reduce the lengthy address resolution time when in a visiting network. We present a performance analysis of the current IETF proposals, namely, the hierarchical Mobile IPv6 architecture and the fast-handoff mechanism. The former is aimed at reducing the registration time while the later in reducing the address resolution time. We show through simulation that managing the registration process in a hierarchical fashion greatly reduces the overall handoff latency. Comparatively, the fast-handoff mechanism is even more capable of reducing the handoff latency. The simple superimposition of these two frameworks produces the best overall handoff latency result. However, the overall improvement is not a simple aggregation of the individual handoff latency gains. In fact, we discovered some rather non-trivial traffic behavior when these two frameworks are combined. We identify the causes which hinder the handoff performance and hence devise a set of design guidelines to improve the handoff latency further.

113 citations


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