Mobile communication has become fundamental for the human life; there is a thriving in the developed technologies. So, the operators are facing a lot of problems for the best uses of the different radio access technology (RATs) that they may have. In this paper, RAT selection algorithm based on four different Radio Access Technologies (RATs).These technologies coexist, namely [UMTS and LTE with Omni directional Antenna, GSM with three sectors and DCS with three sectors. Voice and data application are considered in the heterogeneous wireless networks.sumulation results show the improvement of the whole capacity, Qos and decreases the percentage of UN served users after applying the Proposed Model. For common propagation model (free space). The paper is done via Mat lab tool which will be built based on a random distribution of the customer

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