SUMMARY
Indoor area is an area that lacks a signal so that the signal attenuation continues to be problems that often occur. To overcome these problems need the support of a communication system that can include a signal in the room so that customers can keep communicate with smoothly. The need for application of indoor mobile communications system to support the outdoor system that can serve the entire mobile service users. This research discusses the planning of indoor femtocell LTE 4G network at the electronics building of the Balikpapan State Polytechnic is on the floor 1,2 and 3 with models Cost 231 multiwall indoor propagation. This design is simulated using 5.4 Software Radiowave Propagation Simulator (RPS). From the calculation results, the number of Femtocell Access Points (FAP) on each floor is 3, the placement of FAP in the middle part of each floor of the Electronics building. From the design results obtained on the 1st floor RSRP value of -32.18 dBm and SIR of 12.31 dB, for floors 2 RSRP -34.20 dBm and SIR of 13.52 dB, and floor 3 RSRP value of -33.32 dBm and SIR is 13.27 dB