Abstract
The accuracy of the predicted Received Signal Strength (RSS) is the key issue in the mobile network design. In the last decades many models invented to predict the RSS in specific locations. One of the most famous models is Hata model, which is developed originally based on measurements done in Tokyo – Japan. The objective of this paper is to modify Hata model at frequency band 900 MHz to match the environments of Tripoli area, the capital of Libya. The modifications was based on real measurements of the RSS which were conducted in the concerned area. The modified model is expected to be used during the designing phase of the mobile networks in the future. The measurements is collected in five types of areas (Dense Urban, Urban, Dense Suburban, Suburban and Rural). The regression method is used to modify the Hata model parameters to match the real measured values of RSS within an acceptable range of accuracy. The RMSE (root mean square error) was calculated and used as an assessment factor for the modified module. The modified module gives 4.7 to 23.6 dB improvement in the accuracy of predicting the path loss, i.e. (46.5% to 66.4%) of Hata model values.