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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
02 May 2002
TL;DR: In this paper, a method for wirelessly exchanging communications with at least one mobile unit is described, where the communication protocol does not provide for handoff of communications links between base station units.
Abstract: In a network, a method is disclosed for wirelessly exchanging communications with at least one mobile unit. The network includes first and second base stations units coupled to the network, and may include a system controller. The method includes: receiving a communication signal from the second base station unit, wherein the first and second base station units are configured to employ a wireless communications protocol, and wherein the wireless communications protocol does not provide for handoff of communications links between base station units; at the first base station unit, determining if the second base station unit has been synchronized based on the communication signal; at the first base station unit, if the second base station unit is synchronized, then synchronizing an internal clock based on the synchronized second base station, wherein the synchronizing is performed without assistance from a system controller.

102 citations

Journal ArticleDOI
TL;DR: This article presents a SIP-based architecture that supports soft handoff for IP-centric wireless networks and ensures that there is no packet loss and that the end-to-end delay jitter is kept under control.
Abstract: Application-level protocol abstraction is required to support seamless mobility in next-generation heterogeneous wireless networks. Session initiation protocol (SIP) provides the required abstraction for mobility support for multimedia applications in such networks. However, the handoff procedure with SIP suffers from undesirable delay and hence packet loss in some cases, which is detrimental to applications like voice over IP (VoIP) or streaming video that demand stringent quality of service (QoS) requirements. In this article we present a SIP-based architecture that supports soft handoff for IP-centric wireless networks. Soft handoff ensures that there is no packet loss and that the end-to-end delay jitter is kept under control

102 citations

Patent
Ghisler Walter1
26 Apr 1996
TL;DR: In this article, a mobile switching center switches from the base station to a connection with the sub-section, while the mobile station continues to listen to the identification frequencies and reports the signal strength on its connection.
Abstract: A mobile telephone system has in a cell a base station and sub-stations which are connected to a mobile switching center. The mobile telephone system has control channels and frequencies which are time divided to traffic channels. Some of the frequencies are selected as identification frequencies. Each of the sub-stations is assigned a unique set of frequencies from among the identification frequencies and constantly transmit their respective frequency set. A mobile station connected to the base station listens to the identification frequencies and reports the strongest of these frequencies to the mobile switching center. The mobile switching center compares the reported frequencies with the unique set of frequencies, compares the reported signal strength with a threshold value and selects the nearest sub-station for handoff. The mobile switching center switches from the base station to a connection with the sub-section. The mobile station continues to listen to the identification frequencies and reports the signal strength on its connection. When the strength of the signals from the selected sub-station is low, the connection is switched back to the base station.

102 citations

Patent
Jung-Je Son1, Chang-Hoi Koo1, Yeong Moon Son1, Sung-Jin Lee1, So-Hyun Kim1, Hyun Jeong Kang1 
08 Nov 2004
TL;DR: In this paper, the authors proposed a method for controlling a handover of a mobile subscriber station in a broadband wireless access communication system, based on a service quality level of service being currently provided to the mobile subscriber.
Abstract: Disclosed is a system and a method for controlling a handover of a mobile subscriber station in a broadband wireless access communication system. When serving base station determines to perform a handover of the mobile subscriber station, neighbor base stations to which the mobile subscriber station can be handed over, from among neighbor base stations of the mobile subscriber station, are determined based on a service quality level of service being currently provided to the mobile subscriber station. A handover request signal containing information related to the determined neighbor base station to which the mobile subscriber station can be handed over is transmitted to the mobile subscriber station. The serving base station receives from the mobile subscriber station in response to the request of the handover information about one neighbor base station to which the mobile subscriber station will be handed over, and informs the neighbor base station that the mobile subscriber station will be handed over to the neighbor base station.

101 citations

Journal ArticleDOI
TL;DR: An efficient algorithm is derived for computing minimal power levels for large-scale networks within seconds and the concept of level-/spl alpha/ capacity regions is introduced, which substantiates the fact that the uplink is the more restricting factor in cellular radio networks.
Abstract: Accurate power control is an essential requirement in the design of cellular code-division multiple-access (CDMA) systems. In this paper, we contribute three main themes to the power control problem. First, we derive an efficient algorithm for computing minimal power levels for large-scale networks within seconds. Nice and intuitive conditions for the existence of feasible power solutions follow from this approach. Second, we define the capacity region of a network by the set of effective spreading gains, or data rates, respectively, which can be supplied by the network. This is achieved by bounding the spectral radius of a certain matrix containing system parameters and mutual transmission gain information. It is shown that the capacity region is a convex set. Finally, we reveal an interesting duality between the uplink and downlink capacity region. In a clear-cut analytical way, it substantiates the fact that the uplink is the more restricting factor in cellular radio networks. The same methods carry over to certain models of soft handover. In the case that the channel gains are subject to log-normal shadowing, we introduce the concept of level-/spl alpha/ capacity regions. Despite the complicated structure, it can still be shown that this set is sandwiched by two convex sets coming arbitrarily close as variance decreases.

101 citations


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