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Optimising CDMA cell planning with soft handover

Ghosh, Sasthi C., Whitaker, Roger Marcus, Allen, Stuart Michael and Hurley, Stephen 2013. Optimising CDMA cell planning with soft handover. Wireless Personal Communications 68 (2) , pp. 321-347. 10.1007/s11277-011-0454-9

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Abstract

Soft handover (SHO) is one of the fundamental features of code division multiple access (CDMA) systems such as universal mobile telecommunication system (UMTS), and it is affected by the placement and density of cells. Inclusion of soft handover in optimization models for UMTS and CDMA cell site selection and configuration has previously been very limited but it is important for coverage because it can provide gain to the user. Some authors have excluded SHO on the basis of tractability while others have found that omitting SHO in planning gives adequate solutions. As such the incorporation of SHO remains an important component for definitive investigation in optimisation models for cell planning. In this paper we focus on the problem and effect of including SHO in cell planning optimisation.We introduce a new cell planning optimisation model that explicitly incorporates SHO and reduces computational complexity. Exact results can be obtained when the orthogonality factor is zero, while a conservative approximation of interference is used to generate lower bounds on coverage in the general case.We demonstrate the tractability of this model and show that it leads to improved lower bounds for coverage maximisation in network planning.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Computer Science & Informatics
Systems Immunity Research Institute (SIURI)
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Uncontrolled Keywords: Cell planning; Soft handover; Power control; Radio network design; UMTS; CDMA; Fade margin
Publisher: Springer
ISSN: 0929-6212
Funders: EPSRC
Last Modified: 05 Jul 2019 21:28
URI: http://orca.cf.ac.uk/id/eprint/17294

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