Delovanje sistema za krmiljenje politik in zaračunavanja v mobilnem omrežju četrte generacije

ŠUŠTERŠIČ, ANDREJ (avtor), STERLE, JANEZ (mentor)

V diplomskem delu je predstavljen sistem za krmiljenje politik in zaračunavanja v mobilnem omrežju četrte generacije. Na začetku je predstavljeno omrežje četrte generacije z elementi in vmesniki, ki ga povezujejo. Predstavljeno je delovanje posameznih komponent sistema ter potek prijave uporabnika v mobilno omrežje. V nadaljevanju je podana arhitektura storitvenega omrežja za podporo multimedijskim storitvam z elementi in vmesniki, ki ga povezujejo. Multimedijski podsistem predstavlja standardizirano rešitev za zagotavljanje govornih storitev v mobilnem omrežju, ki za svoje delovanje uporablja paketni podatkovni prenos. Sistem za krmiljenje politik in zaračunavanja nadzira politiko in zaračunavanje v mobilnem omrežju, s katerim lahko oblikujemo storitve z različnimi parametri kakovosti storitve in modeli zaračunavanja, zato predstavlja eno izmed pomembnih novosti četrte generacije mobilnih sistemov. V nadaljevanju so zato podrobno opisani parametri kakovosti storitve, posamezne komponente rešitve ter procedure delovanja sistema za krmiljenje politik in zaračunavanja. Prednosti in praktičen prikaz delovanja sistema in njegovih komponent je predstavljen na postopkih uvedbe novih storitev v produkcijskem mobilnem omrežju. Prav tako je predstavljena uvedba govorne storitve, storitev pretočnega videa, storitev klasične telefonije in dostop do interneta. Vse naštete storitve so realizirane v paketnem mobilnem omrežju. V sklepnem delu pa je na primeru storitve pretočnega videa podan praktičen prikaz delovanja mehanizmov za zagotavljanje kakovosti storitve. Storitev pretočnega videa se je zagotavljala pri močno obremenjeni bazni postaji, na katero so bili povezani tudi ostali mobilni uporabniki. Preizkus je potekal v dveh delih. V prvem delu smo imeli aktiven privzeti podatkovni nosilec s privzetimi parametri kakovosti storitve, kot jih ima dodeljene navaden uporabnik mobilnega interneta. V drugem delu pa smo vzpostavili namenski podatkovni nosilec s parametri kakovosti storitve, ki so prilagojeni za zagotavljanje storitve pretočnega videa. Posledično se je v prvem delu preizkusa ostrina predvajane slike opazno zmanjšala, v drugem primeru pa je ostala ostrina in kakovost slike na najvišji možni ravni. S tem je bila na praktičnem primeru prikazana uspešnost delovanja sistema za krmiljenje politik in zaračunavanja v mobilnem omrežju četrte generacije.

• Jezik: Slovenski jezik
• Ključne besede: napredna evolucija na daljše obdobje, LTE-A, evolucija paketnega sistema, EPS, evolucija paketnega jedra, EPC, mobilno omrežje četrte generacije, 4G, IP multimedijski podsistem, IMS, storitev govora, VoLTE, sistem za krmiljenje politik in zaračunavanja, PCC, kakovost storitve, QoS.
• Vrsta gradiva: Diplomsko delo/naloga
• Organizacija: FE - Fakulteta za elektrotehniko
• Leto izida: 2017
• PID: 20.500.12556/RUL-95808
• Datum objave v RUL: 21.09.2017

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Implementation of a policy and charging control system in fourth generation mobile networks

Izvleček

In this thesis the Policy and Charging Control system of the fourth generation mobile network is presented. The introductory part gives an overview of the fourth generation mobile network architecture, that is, all the network elements and interfaces between them. Also, it deals with the operation of individual components and processes as well as the basic registration to the network. The remainder of the section concentrates on the service network architecture, dubbed IP Multimedia Subsystem. IP Multimedia Subsystem is a standardised architecture (3GPP) which makes use of the underlying packet switched mobile data services for the provision of other multimedia services, mostly multimedia telephony. The Policy and Charging Control system controls the quality and charging parameters of a given subscriber, based on subscription and service used. By means of that system we can design various services using different Quality of Service parameters and charging models. As such it represents one of the most important innovations of the fourth generation mobile network. Hence, the Quality of Service parameters, the individual components and the procedures of this system are described in more detail. The advantages and practical overview of the system and its components are demonstrated by an example of new services introduction. These services are voice services, streaming video services, Internet access and classic telephony services, which are also described to some degree. They all use the packet-switched mobile network as a bearer service. The work concludes with an example of the streaming video service and provides a practical overview of the mechanisms for the provision of the optimal Quality of Service. The streaming video service was provided through a heavily loaded base station, which served also other mobile users. The experiment had two parts. In the first part, an active default bearer with the default Quality of Service parameters was set up, that is in exactly the same way as assigned to a typical mobile Internet user. In the second part, a dedicated bearer with Quality of Service parameters customised for streaming video service was set up. As expected, in the first part of the experiment, the sharpness of the reproduced image was noticeably reduced, and in the second case the sharpness and quality of the image remained at the highest possible level. This experiment demonstrated the desired effectiveness of the Policy and Charging Control system of the fourth generation mobile network.

• Ključne besede: Long Term Evolution Advanced, LTE-A, Evolved Packet System, EPS, Evolved Packet Core, EPC, Fourth Generation Mobile Network, 4G, IP Multimedia Subsystem, IMS, Voice Service, VoLTE, Policy and Charging Control, PCC, Quality of Service, QoS.