| dc.description.abstract | Node-B is major communication media between RNC and user equipment (UE), it contains radio frequency(RF) transmitter(s) and the receiver(s) used to communicate directly with the mobiles. In uplink, the Node B receives the upload data, it transfers signals and transmits to the RNC. In downlink, it also handovers the data from RNC and transmits it to UE. Therefore, the service quality of mobile communication depends upon the location of the Node B and the design of antenna. However, the construction of Node B has not been approved by the owner of land as usual or triggered protest from neighboring residents. Since operators can’t build up with the best location identified it has been quite important for the height, direction and the angle of antenna design that must be considered for good service quality of mobile communication.
So far engineers usually works out the height, direction and angle of antenna in terms of their own experiences as the Node B is installed. Coverage area of antenna meets the expected performance or not, it only relies on data collected by signal test afterward to adjust. The continuous adjustment probably occurs when performing invalid data.
The thesis is to take advantage of signal coverage model and input antenna type, height, angle and node B transmit frequency related data to estimate coverage range and signal strength. Furthermore the antenna and Node B parameters were adjusted referring to the need to improve the area covered by the cell loading. The results above were estimated. In the research, the model was verified by comparing with the data collected by signal test in practice. It supports the angle of antenna design in the future and efficiently optimizes the existing service quality of mobile communication. | en_US |