Murad, Ridwan (PhD)Hagere, Demessie2019-01-092023-11-042019-01-092023-11-042018-11http://etd.aau.edu.et/handle/123456789/15578Universal Mobile Telecommunications System (UMTS) which has been standardized by the 3rd Generation partnership project (3GPP) organization, utilizes Wideband Code Division Multiple Access (WCDMA) as radio access technology. UMTS are designed to meet the increasing demands for high data rate applications and greater mobility. High data rate applications include voice, video telephony, Video streaming, File Transfer protocol (FTP), high quality image and wireless internet access. But there are many factors like loading of cell, interference etc. that limits to access these high data rate services or limits the capacity of the systems. The uplink channel is, by nature, an interference-constrained multiple-access channel. Cross border interference is caused due to the usage of the same set frequencies between two adjacent boundaries of different operators. This is the case where other operator locates their base stations in close proximity in order to provide comparable coverage to their customers. This thesis attempts to identify cross boarder interference, analysis to its impacts to the uplink capacity of all service in UMTS systems and loss of revenues is presented. The work starts with UMTS overview and learn some important concept about UMTS uplink channel interference. Then go deep into uplink channel capacity and apply the two load analysis methods to estimate the capacity loss. In the end revenue is calculated using the tariff incurred for each types of service. Ethio telecom can use this research to gain a better understanding of the problem in order to plan a strategy required to be profitable. The results described in this thesis will be a valuable contribution towards the awareness of how interference of another operator’s network (which we can’ t control) affects the performance of the network elements at boarder town.en-USCross Boarder InterferenceWCDMAUplink ChannelCapacityRevenueThesis