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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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Journal ArticleDOI
Wonjun Lee1, Eunkyo Kim1, Joongheon Kim1, Inkyu Lee1, Choonhwa Lee1 
TL;DR: An MAV handover algorithm is proposed in this paper to exploit movement pattern for avoiding unnecessary handovers in the integrated WLAN and Mobile WiMAX networks to address seamless ubiquitous access.
Abstract: This paper addresses a movement-aware vertical (MAV) handover algorithm between WLAN and Mobile WiMAX for seamless ubiquitous access. An MAV handover algorithm is proposed in this paper to exploit movement pattern for avoiding unnecessary handovers in the integrated WLAN and Mobile WiMAX networks. If a mobile station (MS)'s velocity is high and its movement pattern is irregular, unnecessary handovers likely occur more frequently. Therefore, the MS velocity and moving pattern are important factors for the handover decision procedure. To avoid unnecessary handovers, the MAV handover algorithm adjusts the dwell time adaptively and predicts the residual time in the cell of target base station (BS). Consequently, the adaptive dwell timer of MAV handover algorithm allows an MS a better connection as long as possible. Our simulation results show that the reduction of unnecessary handovers by leads to significant throughput improvements.

87 citations

Patent
23 Apr 2008
TL;DR: In this paper, the authors present a method and apparatus for handling RL and handover failures based on context transfer details and RACH procedures that enhance the failure handling procedures, where a UE includes the identity of an evolved Node-B (eNodeB) and/or cell as an information element (IE) in an RRC connection request.
Abstract: The method and apparatus disclosed are used for handling RL and handover failures based on context transfer details and RACH procedures that enhance the failure handling procedures. After an RL failure, a user equipment (UE) includes the identity of an evolved Node-B (eNodeB) and/or cell as an information element (IE) in an RRC connection request and/or a cell update message or any other RRC message along with a UE identity.

87 citations

Patent
08 Aug 1995
TL;DR: In this paper, the authors proposed a method and apparatus used in the context of a digital cellular communication network for allowing a remote unit to determine the conditions under which a handoff should occur and the procedure to be followed.
Abstract: A method and apparatus used in the context of a digital cellular communication network for allowing a remote unit to determine the conditions under which a handoff should occur and the procedure to be followed. The method and apparatus of the present invention controls handoffs in a manner which causes the boundaries of a cell within a digital cellular network to remain relatively well defined and to very closely conform to the boundaries of a cell of an advanced mobile phone system with which the cellular digital packet data system is associated. The present invention also reduces the effort required by a remote unit within a cellular digital packet data communication system when attempting to change channels. Primary and Secondary Thresholds are defined in accordance with the present invention. These Thresholds aid in determining when a link should be handed off (and thus define the boundaries of cells of the system) and which channels are appropriate candidates to attempt to scan to track a hop or determine when to initiate a handoff. The Thresholds represent performance thresholds which can be used to determine whether the airlink can reliably transmit information.

87 citations

Journal ArticleDOI
TL;DR: A reinforcement learning based handoff policy named SMART is proposed to reduce the number of handoffs while maintaining user Quality of Service (QoS) requirements in mmWave HetNets and proposes reinforcement-learning based BS selection algorithms for different UE densities.
Abstract: The millimeter wave (mmWave) radio band is promising for the next-generation heterogeneous cellular networks (HetNets) due to its large bandwidth available for meeting the increasing demand of mobile traffic. However, the unique propagation characteristics at mmWave band cause huge redundant handoffs in mmWave HetNets that brings heavy signaling overhead, low energy efficiency and increased user equipment (UE) outage probability if conventional Reference Signal Received Power (RSRP) based handoff mechanism is used. In this paper, we propose a reinforcement learning based handoff policy named SMART to reduce the number of handoffs while maintaining user Quality of Service (QoS) requirements in mmWave HetNets. In SMART, we determine handoff trigger conditions by taking into account both mmWave channel characteristics and QoS requirements of UEs. Furthermore, we propose reinforcement-learning based BS selection algorithms for different UE densities. Numerical results show that in typical scenarios, SMART can significantly reduce the number of handoffs when compared with traditional handoff policies without learning.

87 citations

Patent
13 May 1997
TL;DR: In this article, a handover scheduling command is transmitted over the first channel to the mobile station, and upon receipt of the handoff scheduling command, the mobile stations (14 and 16) performs steps necessary to establish a second communications link over a second channel (27), prior to the scheduled handover time.
Abstract: A method and apparatus are provided for controlling mobile and base stations (14 and 16) during satellite (12) based telecommunications to perform scheduled handovers between two communications channels (26 and 27). The base station (16) determines when a handover will be necessary. Once determined, the base station (16) generates a handover scheduling command (node #4) which includes a scheduled handover time representing a time in the future at which the handover will occur. The handover scheduling command is transmitted over the first channel to the mobile station (14). Upon receipt of the handover scheduling command, the mobile station (14) performs steps necessary to establish a second communications link over a second channel (27), prior to the scheduled handover time. At the scheduled handover time (node #21), the mobile and base stations (14 and 16) have established the second communications link on the second channel (27). To establish the second channel the mobile station calculations of the second channels frequency, timing offset and power level (node #11). By using a scheduled handover process, the mobile and base stations (14 and 16) avoid the production of interference and breaks within a conversation transmitted therebetween.

87 citations


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