Communication networks for public safety based on fourth generation mobile technologies

Diplomsko delo opisuje širokopasovni komunikacijski sistem za javno varnost, ki je osnovan na tehnologijah četrte generacije mobilnih sistemov. V prvem delu so opisane obstoječe ozkopasovne komunikacijske tehnologije, ki se uporabljajo za potrebe javne varnosti. Te tehnologije so TETRA, DMR, TETRAPOL in P25. Nato so podane zahteve, ki jih določajo standardi s področja javne varnosti, ter opis omrežja FirstNet. Temu sledi podrobnejši opis mobilnega sistema LTE/EPC, kjer so opisani elementi omrežja, koncept mobilnost med sistemi 3GPP, mobilnost med celicami in baznimi postajami, varnostne razširitve sistema, metode za zagotavljanje kvalitete storitev, mehanizmi za virtualizacija sistemskih virov MVNO in APN, pregled standardov s področja javne varnosti ter razširjene funkcionalnosti (P2T, DMO, relejna postaja) širokopasovnega sistema za potrebe javne varnosti. V zadnjem delu naloge so podane možnosti za realizacijo sistema BB-PPDR preko tehnologije LTE/EPC. Opisan je koncept poslovnega APN, koncept MVNO in nacionalnega gostovanja, deljenega radijskega omrežja LTE in realizacija omrežja na osnovi namenskega sistem LTE/EPC. V praktičnem delu, so bile opravljene meritve obstoječega komercialnega omrežja. Meritve so bile izvedene v primestnem okolju. Zajemale so naslednje parametre: čas potreben za prehod terminala v stanje aktivnosti, obhodni čas prenosa paketov, dosežene prenosne hitrosti, oddajno moč terminala in jakost sprejetega signala. Odzivnostne in zmogljivostne karakteristike komercialnega mobilnega omrežja so prikazane v histogramih in grafih CDF ter tabelah z glavnimi vrednostmi. Rezultati nam služijo za oceno potencialne kapacitete in zmogljivosti komunikacijska omrežja za potrebe javne varnosti, realiziranega na osnovi mobilnih tehnologij četrte generacije.The thesis describes the broadband communication system for public safety, which is based on fourth generation mobile technologies. The first part describes the existing narrowband technologies that are used for public safety. These technologies are TETRA, TETRAPOL, DMR and P25. After that are described the concepts and requirements set by standards and the network FirstNet. This is followed by a more detailed description of the LTE/EPC systems, which incluede the network elements, the concept of mobility between 3GPP systems, mobility between cells and base station, security extensions of system, methods to ensure the quality of service, mechanisms for virtualization of system resources MVNO and APN, inspection standards in the field of public security and extended functionality (P2T, DMO, Relay Station) of a broadband system for needs of public safety. Finally part of the teoretical section represents a various concepts for the realization of the system BB PPDR over LTE/EPC. Described concepts are Non-Mission Critical Interworking with Commercial Mobile Radio Networks, Partly Mission Critical Roaming with Commercial Mobile Radio Networks, RAN Sharing Scenario and the realization based on Dedicated System LTE/EPC. For the practical part of thesis, measuerements were made of the existing commercial networks. They were carried out in a suburban enviroment. They included the following parametrs: the time required for the passage of the terminal into a state of activity, round trip time of packages, achieved transfer speeds, the transmission power of terminal and the power of the received signal. The responsiveness and performance of the commercial network is shown in histograms and CDF graphs and tables of key values. The results serve to assess the potential capacity and performance of the communications networks for the purpose of public safety, realized on the basis of the fourth generation mobile technologies