A soft handover process is common happen in communication, take place when the mobile position is in the interfere concealment place of two neighbor cells. The work of this paper presents modeling access seam on the customer Equipment/Mobile peripheral for the radio interface with 3GPP UMTS standards. Therefore, the main objective of this paper is focus on how the data traffic in both upper link and downer link working in each Medium Access Control/Radio Link Control sub-layer. In this simulation, The OPNET optimization software is used. The simulation is taken three Scenarios, the first scenario is to analyze the soft handover of user in the network when send and revived data in the uplink and downlink from the BTS (node-B) and explain the several cells in UE's Active Set and explain the cells are added into and removed during the simulation. The second scenario is explain the effect of the Node_B coverage area and show the effect of the maximum path loss in network and showing the maximum path loss increase the coverage decrease. The last scenario describe the effect of the Node_B Capacity, when the users move towards the node_B the total transmitted load in the cell will increase and overall uplink productivity of the Node B will increase and uplink transmission power increase this effect that the capacity .the result of the possibility a customer which is soft handover and explain the impact of it, the graph is explained the capacity and the coverage of system