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The management of quality of service in communication network systems, particularly to support multimedia applications, includes service requirements, hardware implementation, propagation path loss and system requirements. The signal attenuation between multiple mobile stations and base stations affected by various free space path loss, zones of poor coverage, dropouts, effects of multi-path reception, fading due to parameters like vegetation, rain, and snowfall deteriorates the strength of signals. An attempt has been made to modify the Walfisch-Ikegami model of propagation path loss model by adding the effect of vegetation, sea, rain and snowfall. A simulation has been carried out. The impact of these parameters on the quality of service is presented.