The implementation of a wireless communication telephony system needs a proper planning and designing of a system. Such designing needs a link budget calculation for proper call establishment. Radio propagation profoundly site specific and varies considerably based on speed of mobile terminal, frequency of operation and the parameters like antenna height, antenna gain, transmitted power, path loss, other losses and receiver sensitivity. The received signal strength depends on the path loss and the parameters of the transmitter and receiver. Quality of call establishment is based on received signal strength. Signal strength varies based on the environment and the intermediate losses.