This paper presents the performance analysis of Bluetooth Low Energy (BLE) IEEE 802.15.1 standard in the piconet topology networks. The performance of the BLE network is analyzed in terms of connection interval (CI) and the number of slaves (NS) by using OMNET++ (v4.6) simulator. In the performance investigation process Data Length Extension (DLE) features is used with an application payload size of 60 bytes in order to achieve the best performance in a BLE (P2P) network. The modeled networks and due to the nature of short-range BLE wireless communication show a good matching between analytical and simulation results. For Single-Slave (or one like) piconet the obtained maximum simulation throughput is 478.7 kbps when a connection interval of (7.5) ms is used.