UMTS/WCDMA Coverage and Capacity Planning for Better Safety and Operation of Railway, A Case Study of Addis Ababa – Djibouti Route

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Addis Ababa University


This thesis involves planning of coverage and estimated capacity of Universal Mobile Telecommunications Service network for railway (UMTS-R) which uses Wideband Code Division Multiple Access (WCDMA) radio interface between the third generation (3G) base station and user equipment for railway better operation and safety by replacing Global System for Mobile Communication – Railway (GSM-R) to ensure safety and increase additional services for future railway system so that customer satisfaction is enhanced. The Addis Ababa – Djibouti railway route at long stage operation (in 2035) is taken as a case study and geographical and morphological nature of the route is taken with the assumption of further extension of suburban areas in the future. The design involves certain steps including: creating route path on Google earth as KML/KMZ file, convert to AutoCAD file using Zonums online solution and then to TAB file using MapInfo professional 7.8. Finally Atoll radio network simulation uses this file as an input to design the coverage while nature of each node B site is taken in to consideration to optimize the coverage and capacity. The design involves numerous parameter calculations and WCDMA standard or assumed values used to compute the link budget of two samples that are mostly used data rates (12.2Kbps voice and 144 Kbps packet switched data) by using Okumura-Hata path loss model which is chosen reasonably after simulating the cell range versus path loss using MATLAB software. A rough estimation of both uplink and downlink maximum capacity is done for the mixed traffic. Repeated simulation trials have been done to obtain better redundant or reliable network service and ends up with 97 Node B sites to serve a redundant system in which half number of the total Node Bs can fully operate the route with acceptable signal level for the case study route. Finally, a rough comparison of Universal Mobile Telecommunication Services – Railway (UMTS-R) and GSM-R capacity and coverage for the route is done. As a result, an extra estimated capacity and better and reliable coverage is obtained. To make this design full and practically operable, there is a room to extend on analysis of inters and intra system interference, Electromagnetic Compatibility analysis, cost analysis and detail system optimization.



GSM-R, WCDMA, UMTS-R, Optimization, Capacity, Coverage, ATOLL, EMC