Open BTS

Abstrak Dalam penulisan proyek akhir ini membahas mengenai decoding komunikasi GSM terenkripsi. Alat yang digunakan adalah RTL-SDR yang dapat menangkap sinyal BTS (Base Transceiver Station) dan aplikasi Gr-GSM untuk proses decoding data yang ditangkap dari BTS. Tujuan dari penulisan proyek akhir adalah untuk menganalisis keamanan data pada jaringan komunikasi GSM. Dari hasil analisis ini dapat disimpulkan bahwa, dari proses pengujian penangkapan sinyal dan decoding mendapatkan informasi operator dari frekuensi berupa GSM Frame Number, IMSI (International Mobile Subscriber Identity), TMSI (Temporary IMSI), algoritma keamanan yang digunakan pada operator, dan data komunikasi pada keamanan GSM. Abstract In this final project writing discusses the decoding of encrypted GSM communications. The tool used is RTL-SDR which can capture BTS (Base Transceiver Station) signal and Gr-GSM application for data decoding process captured from BTS. The purpose of writing the final project is to analyze data security on GSM communication networks. From the results of this analysis can be concluded that, from the process of testing the signal capture and decoding obtain operator information from the frequency of GSM Frame Number, IMSI (International Mobile Subscriber Identity), TMSI (Temporary IMSI), security algorithm used on operators, and communication data on GSM security.

Pulogadung Industrial Zone is one area for industries with specialized management by PT Jakarta Industrial Esatate Pulogadung. Including the management of telecommunications and its infrastructure needs to be coordinated with area authorities.
From the drivetest results JIEP Region seen there are still some areas with low coverage. This is because the distance between the sites are still far apart and the condition of buildings in the industrial area locations are mostly multi-storey buildings.
In accordance with the regulatory situation, BTS offers a solution to repair cellular coverage with the adjustment to the minimum requirement of space and aesthetics. Distributed Antenna System, known as BTS Hotel offers technology base station is centered on one location serving multiple remote sites. Each remote site is connected to the base station using a fiber. Remote site placed in locations that have not been reached for the optimal mobile services for a particular target.The objective of this scheme is to plan the network BTS Hotel in Pulogadung Industrial Estate as the solution of the expansion of the service area and increase service capacity by planning coverage planning, capacity planning, and fiber optic network. This was done to estimate the number of poles and extensive coverage of every cell and fiber optic network topology.
The results of the design using a Multiple-Carrier Multiple-Technology configuration. OBQ value obtained from the design of 27.95 Mbps / km2 for 3G UMTS networks and 10.51 Mbps / km2 for 4G LTE networks. Number pole of the result of design as much as 43 pole, with an area of 0.098 Km2 coverage / cell and a radius of 194.5 m. As for the fiber optic network, using the Single Core Multi Mode Fiber Optic requiring a total cable length of about 15.89k m.
Keywords—BTS Hotel; Capacity Planning; Coverage Planning

Abstrak Open Base Transceiver Station (OpenBTS) merupakan aplikasi telekomunikasi open source yang berjalan di linux. Teknologi ini mampu menggantikan infrastruktur jaringan Global System for Mobile Communication (GSM) komersial. Dengan openBTS, implementasi BTS menjadi lebih mudah dan murah, serta biaya SMS antar user dapat menjadi lebih murah atau bahkan gratis. Penelitian ini mengimplementasikan OpenBTS versi 5 dengan layanan SMS pada jaringan GSM menggunakan sistem operasi ubuntu 14.04 dan USRP tipe RAD1.

The “geo-encryption” or “location-based encryption” is a security algorithm that limits the access or decryption of information content to specified locations and/or times. This algorithm does not replace any of the conventional cryptographic algorithms, but instead adds an additional layer of security to exist stack. GSM is chosen as a case study to implement geo-encryption in its key generation part due to its many properties that are beneficial to this protocol. GSM's BTSs are distributed across the network and their signal can reach places like urban canyons and indoor environments inside the network. In GSM, data stream between mobile subscriber (MS) and BTS is encrypted by A5 encryption algorithm. A5's encryption and decryption key (kc) is generated base on MS's SIM card parameter (ki) and a random number, RAND. At this project we have used MS's location information to generate this key by geoencryption algorithm idea. Encrypted data only in the MS's location, that just GSM network is aware of it, can be decrypted and its accuracy depends on used positioning algorithm.

PT. Telkomsel, Tbk adalah salah satu operator jaringan Telekomunikasi di Indonesia. Sampai tahun 2016 ini, PT. Telkomsel, Tbk terus membangun jaringan baru di wilayah Jabodetabek. Salah satu alasannya adalah traffic yang sangat tinggi di wilayah Jabodetabek terutama traffic data. Ekspansi jaringan di Jabodetabek  ini meliputi penambahan BTS (Base Transceiver Station) dan tentunya link penghubung antar BTS ke BSC (Base Station Controler) dan MSC (Mobile Switching Center).
Sehubungan dengan hal tersebut, maka diperlukan suatu perencanaan jaringan yang baik agar diperoleh performansi yang optimum. Dari sisi BTS, perlu direncanakan terutama dalam hal kapasitas kanal. Sedangkan kendala yang dihadapi untuk wilayah jabodetabek adalah keterbatasan lahan dan biaya operasional untuk mendirikan sebuah site. Untuk mengatasi hal tersebut maka PT Telkomsel bekerjasama dengan beberapa operator telekomunikasi mencoba sebuah solusi dengan membangun system Hotel BTS. Pada system ini PT. Telkomsel, Tbk menggunakan medium transmisi fiber optic untuk mengaplikasikan system Hotel BTS tersebut.
Kata kunci: traffic meningkat, perencanaan jaringan, system hotel BTS