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.

Method of controlling handover in a multicellular radio communications network, and speed estimation methods relating thereto

Abstract: In a multicellular radio communications network, when a mobile station satisfies a criterion for automatic intercellular handover from a source cell to a target cell, the speed of movement of the mobile station with respect to the base station of the target cell is estimated on the basis of the measured levels of the signal which the mobile station has received from this base station before the handover criterion is satisfied. Depending on the layers of the cells concerned, it is then possible to take account of this speed estimate in order to decide whether or not to trigger intercellular handovers.

IEEE 802.11 Handovers Assisted by GPS Information

Abstract: IEEE 802.11 networks are now very common and are present in various locations. While roaming through access points, a mobile node is often required to perform a link layer handover. This mechanism causes user-interceptable connection loss and breaks in time-sensitive communication, especially if a network layer handover follows the link layer handover. Many solutions attempting to improve this process have been proposed but only a few use geolocation systems in the management of the handover. In this article, we present a new method to enhance both link layer and network layer handovers using geolocation information provided by a GPS system. The idea behind our algorithm is to predict the next mobile node point of attachment and the associated sub-network using the position of the mobile nodes. This method has been implemented using the new Mobile IP daemon for GNU/Linux operating system and evaluated through two scenarios

Caching Meets Millimeter Wave Communications for Enhanced Mobility Management in 5G Networks

Abstract: One of the most promising approaches to overcoming the uncertainty of millimeter wave (mm-wave) communications is to deploy dual-mode small base stations (SBSs) that integrate both mm-wave and microwave ( $\mu \text{W}$ ) frequencies. In this paper, a novel approach to analyzing and managing mobility in joint mmwave– $\mu \text{W}$ networks is proposed. The proposed approach leverages device-level caching along with the capabilities of dual-mode SBSs to minimize handover failures and reduce inter-frequency measurement energy consumption. First, fundamental results on the caching capabilities are derived for the proposed dual-mode network scenario. Second, the impact of caching on the number of handovers (HOs), energy consumption, and the average handover failure (HOF) is analyzed. Then, the proposed cache-enabled mobility management problem is formulated as a dynamic matching game between mobile user equipments (MUEs) and SBSs. The goal of this game is to find a distributed HO mechanism that, under network constraints on HOFs and limited cache sizes, allows each MUE to choose between: 1) executing an HO to a target SBS; 2) being connected to the macrocell base station; or 3) perform a transparent HO by using the cached content. To solve this dynamic matching problem, a novel algorithm is proposed and its convergence to a two-sided dynamically stable HO policy for MUEs and target SBSs is proved. Numerical results corroborate the analytical derivations and show that the proposed solution will significantly reduce both the HOF and energy consumption of MUEs, resulting in an enhanced mobility management for heterogeneous wireless networks with mm-wave capabilities.

Satellite cellular communication methods for performing cell-to-cell handoff

Abstract: Handoff methods perform cell-to-cell handoff between cells of the same satellite and between cells of different satellites. Handoff is initiated by an individual subscriber unit (ISU) based on local conditions. Once handoff is needed, the ISU chooses a candidate cell to transfer its communication based on a dynamic handoff candidate list provided by the satellite. After selecting a candidate cell, the ISU requests handoff, the satellite or satellites perform the handoff and communication begins over a new channel in the candidate cell.

Method for determining position of mobile communication terminals

Abstract: A number of different solutions are disclosed for gathering access delay and distance measurement information for use in determining the position of a cellular mobile station (112, 160). For all of these solutions, one frequency and one uplink channel in each cell are dedicated for position determination. In one aspect of the present invention, a method is provided for determining the position of a mobile station (112, 160) using handover procedures for all of the cells or certain predefined cells in the network (100). One uplink channel is dedicated within each cell in the network (100) to be used for position determination. These positioning channels continuously listen for handover access requests. Cells detecting (124) the access bursts can measure (124) the access delay and determine the distance (128) to the requesting mobile station (112, 160). A triangulation calculation (128) is used to pinpoint the mobile station's (112, 160) position. In another aspect of the present invention, a method is provided for determining the position of a mobile station (112, 160) using position determination procedures for all of the cells or certain predefined cells in the network (100).