Prototipo de red GSM basada en SDR (Software Defined Radio)

Abstract

This final career project proposes the implementation of a GSM (Global System for Mobile Communications) network prototype based on SDR (Software Defined Radio) using the Linux-based OpenBTS software and the USRP (Universal Software Radio Peripheral) hardware. The GSM standar has been chosen because it is one of the most successful standards with the greatest impact socio-economic and technological on the mobile telephony ecosystem and It has been key in the development of subsequent generations. By integrating GSM with SDR, it is possible to implement a prototype of an experimental GSM network, which can become a testbed for future innovations and developments in SDR dynamics that seek to provide alternative mobile infrastructures to rural populations that are still they are part of the great digital divide. The project is structured as follows. Chapter one briefly describes theoretical aspects related to the project such as: GSM, SDR and open source projects such as OpenBTS and the USRP platform. Chapter two presents the requirements of the prototype to be implemented in both software and hardware. In addition, the installation processes of the operating system, libraries, dependencies, the OpenBTS project and its services are exposed: Asterisk, SIPAuthServe, SMQueue and OpenBTS as such, which are then configured. In chapter three the tests of prototype operation are exposed making a telephone call and sending a short text message between two mobile terminals. Chapter four presents the conclusions and recommendations obtained throughout the implementation of the project.