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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
30 Apr 2004
TL;DR: In this paper, the authors proposed a method and associated system that enables seamless data roaming and handoff between the wireless local area network (WLAN) and the wireless wide-area network (WWAN).
Abstract: A method and associated system enables seamless data roaming and handoff between the wireless local area network (WLAN) and the wireless wide-area network (WWAN). This method enables a mobile device to originate a data connection in the WLAN and have this data connection be automatically handed off to the WWAN without losing the connection when the user goes outside the range of the WLAN. Similarly, it enables a mobile device to originate a data connection in the WWAN and have this data connection be automatically handed off to the WLAN without losing the connection when the user loses the signal of the WWAN. This solution assumes that the user has subscribed to data services from a cellular carrier that will authenticate the user before permitting the handoff.

90 citations

Posted Content
TL;DR: In this article, the authors proposed the concentrator-based and without concentrator based femtocell network architecture and presented the signal flow with appropriate parameters for the handover between 3GPP UMTS based macrocell and femtocells networks.
Abstract: The femtocell networks that use home base station and existing xDSL or other cable line as backhaul connectivity can fulfill the upcoming demand of high data rate for wireless communication system as well as can extend the coverage area. Hence the modified handover procedure for existing networks is needed to support the macrocell/femtocell integrated network. Some modifications of existing network and protocol architecture for the integration of femtocell networks with the existing UMTS based macrocell networks are essential. These modifications change the signal flow for handover procedures due to different 2-tier cell (macrocell and femtocell) environment. The measurement of signal-to-interference ratio parameter should be considered for handover between macrocell and femtocell. A frequent and unnecessary handover is another problem for hierarchical network environment that must be optimized to improve the performance of macrocell/femtocell integrated network. In this paper, firstly we propose the concentrator based and without concentrator based femtocell network architecture. Then we present the signal flow with appropriate parameters for the handover between 3GPP UMTS based macrocell and femtocell networks. A scheme for unnecessary handoff minimization is also presented in this paper. We simulate the proposed handover optimization scheme to validate the performance.

90 citations

Patent
Dongming Zhu1, Hui Li, Jiongjiong Gu, Baofeng Zhang, Shibi Huang 
03 Jan 2007
TL;DR: In this article, the authors present a method and a system for maintaining session continuity, in which the system includes: a Handover Source Function (HOSF), a HODF, a HOO- Destination Function, a HOAF Anchor Function Control Plane (HOAF-CP), and HOAF-UP, which can logically replace the connection before handover with a new connection to ensure the session continuity.
Abstract: A method and a system for maintaining session continuity, in which the system includes: a Handover Source Function (HOSF), a Handover Destination Function (HODF), a Handover Anchor Function-Control Plane (HOAF-CP) and a Handover Anchor Function-User Plane (HOAF-UP). The method includes: a first user establishing a connection through the HOSF with the HOAF-CP and the HOAF-UP which correspond to a second user, so as to establishing a session with the second user; during session handover, the HODF that corresponds to the HOSF establishing another connection with the HOAF-CP and HOAF-UP though which the first user continues the session with the second user, so as to maintain the session continuity. When the access address or the access means of the terminal changes, or even the terminal changes during a session, embodiments of the present invention can logically replace the connection before the handover with a new connection to ensure the session continuity.

90 citations

Patent
Dan Forsberg1
06 Jul 2006
TL;DR: In this paper, a secure session keys context approach is proposed for wireless mobile nodes without sacrificing the security between a mobile node and wireless access points in an access network, which has all the good features, like mobility and security optimization, of the currently existing proposals of key-request, pre-authentication, and pre-distribution but also provides improved scalability for the access network and for the mobile node.
Abstract: Handoffs must be fast for wireless mobile nodes without sacrificing the security between a mobile node and wireless access points in an access network. A secure session keys context approach is shown having all the good features, like mobility and security optimization, of the currently existing proposals of key-request, pre-authentication, and pre-distribution but also providing improved scalability for the access network and for the mobile node. The new approach is compared to the existing proposals including memory requirements and especially how to reduce memory usage using a “just-in-time” transfer of security information between access points and a mobile node during a handover.

90 citations

Proceedings ArticleDOI
Z. Dai1, R. Fracchia1, J. Gosteau, P. Pellati, Guillaume Vivier 
19 May 2008
TL;DR: A new user centric algorithm for vertical handover, which combines a trigger to continuously maintain the connection and another one to maximize the user throughput is proposed, which raises the system capacity, thus increasing the gain that can be achieved with a WiMAX and WiFi heterogeneous deployment.
Abstract: Next generation wireless communications will likely rely on integrated networks consisting of multiple wireless technologies. Hybrid networks based, for instance, on systems such as WiMAX and WiFi can combine their respective advantages on coverage and data rates, offering a high Quality of Service (QoS) to mobile users. In such environment, WiFi/WiMAX dual mode terminals should seamlessly switch from one network to another, in order to obtain improved performance or at least to maintain a continuous wireless connection. This paper proposes a new user centric algorithm for vertical handover, which combines a trigger to continuously maintain the connection and another one to maximize the user throughput (taking into account the link quality and the current cell load). Moreover, we detail the implementation of that algorithm in existing standard technologies like 802.11 and 802.16. We show that, compared to more classical handover approaches, our proposed algorithm raises the system capacity, thus increasing the gain that can be achieved with a WiMAX and WiFi heterogeneous deployment.

90 citations


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