Gsm-r Radio Network Planning And Dimensioning For Isaka-kigali Railway Line

Railway Control and Communication system is the heart of safe and reliable railwayrnoperations. From the very birth of railway operations up to now, railways have encounteredrnchallenges in operations mainly accidents due to head to head collision for trains moving inrnopposite directions on a same track and rear-end collision in case a train hits the one in frontrndue to high speed and not enough breaking power as a result of lack of efficientrncommunication and train control system. Besides this, railway capacity optimization whichrninvolves use of maximum number of trains on a track in given time period also requiresrnefficient communication and control for train dispatching. Different means for train controlrnand communication have been used such as Terrestrial Trunked Radio (TETRA), GlobalrnSystem for Mobile Communication – Railway (GSM-R), Enhanced position and locationrnreporting system (EPLRS), inductive loop, satellite, and the current trend of Long TermrnEvolution – Railway (LTE-R).rnThis thesis project focuses on planning a GSM-R radio communication network for ISAKAKIGALIrnRailway line. GSM-R has been chosen due to its several advantages such as beingrnthe first international communication network designed specifically for railways; GSM-R hasrnbeen proven to maintain a reliable communication link between the train and the ground;rnGSM-R has a great experience of nearly 3 decades which shows its maturity as arncommunication and control system for trains and the last but not the least, GSM-R is at thernheart of European Train Control System Level 3(ETCS-3) which implements a moving blockrntechnology. Network coverage planning and dimensioning is carried in three phases whichrnare technical analysis of elements causing traffic on the network for network dimensioning,rncalculation of important parameters for Base Transceiver Station (BTS) deployment andrnnetwork simulation in Atoll software to calculate the number of BTSs required providingrnradio coverage for the entire line. The obtained results are that a total of 92 BTSs are requiredrnto provide a fully redundant GSM-R network whereby each cell’s BTS is assigned a singlernfrequency channel except at Major station and other medium stations where more than onernfrequency channel is required due to high telecommunication traffics taking place there, andrnthe network has to be able to support a total traffic intensity of 7.54Mbps in busy hour.rnCoverage in tunnels is chosen to use leaky feeders connected to BTS adjacent to tunnel entry.

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