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Effect of lateral displacement of a high-altitude platform on cellular interference and handover

Thornton, J and Grace, D (2005) Effect of lateral displacement of a high-altitude platform on cellular interference and handover. IEEE Transactions on Wireless Communications. pp. 1483-1490. ISSN 1536-1276

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Abstract

A method for predicting movements in cellular coverage caused by lateral drift of a high-altitude platform (a quasi-stationary platform in the stratosphere) is developed. Cells are produced by spot beams generated by horn-type antennas on the platform. It is shown how the carrier-to-interference ratio (CIR) across these cells varies when the antenna payload is steered to accommodate the lateral movement of the platform. The geometry of the antenna beam footprint on the ground is first developed and then applied to a system of many cochannel beams. Pointing strategies are examined, where the pointing angle is calculated to keep, for example, a center cell or an edge cell in the same nominal position before and after the platform drift, and the CIR distribution is calculated. It is shown that the optimum pointing angle depends on the desired level of CIR across the service area, typically lying between 3 +/- 0.75 degrees for a platform drift of 2'km and corresponding to a cell in the middle ring. It is shown that it is necessary for a significant proportion of users to perform a handover to maintain a given CIR after platform drift. The analysis reveals that there is an optimum pointing angle that minimizes the probability of handover for a particular value of drift and CIR.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: antennas, broadband communication, high-altitude platforms, interference, DYNAMIC CHANNEL ASSIGNMENT, WIRELESS COMMUNICATIONS, POWER-CONTROL, PERFORMANCE, ALGORITHMS, SERVICES
Institution: The University of York
Academic Units: The University of York > Electronics (York)
Depositing User: Sherpa Assistant
Date Deposited: 15 Dec 2006
Last Modified: 16 Oct 2014 07:54
Published Version: http://dx.doi.org/10.1109/TWC.2005.850282
Status: Published
Refereed: Yes
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/1829

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