Analiza kvalitete mobilne govorne usluge

master's thesis

• Title (english): Analysis of mobile voice service quality
• Author: Ivana Perčinlić
• Mentor: Krešimir Malarić (mentor)
• Committee member: Krešimir Malarić (predsjednik povjerenstva)
• Committee member: Dina Šimunić (član povjerenstva)
• Committee member: Gordan Ježić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2016-07-11, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Govorne usluge danas predstavljaju jednu od ključnih usluga koju osiguravaju telekom
operatori. Stoga je vrlo bitno osigurati njihovu kvalitetu i prijenos. U novim
generacijama mreža se nastoji uvesti zajednička infrastruktura te integracija usluga za
fiksne i mobilne mreže. Zajednička infrastruktura se temelji na IMS platformi koja
omogućuje mrežama nove generacije "sve-IP" rješenje, odnosno prijenos svih usluga,
pa tako i govora, komutacijom paketa. U početku razvoja mreža, govor se prenosio
samo tehnologijom komutacije kanala i to je osiguravalo dobru kvalitetu, ali ne i
efikasnost. Zbog toga u mrežama novijih generacija postoje razna interoperabilna rješenja,
poput prijenosa govora putem IP protokola i "fallbacka" koji prilikom uspostave
govornog poziva vraća uređaj na 2G/3G mreže i koristi komutaciju kanala. VoLTE
prenosi sve podatke komutacijom paketa, a kvalitetu usluge osigurava prioritizacijom
paketa tako da glasovni paketi imaju prednost nad ostalim podatkovnim paketima. Jedan
od ključnih indikatora performansi kojima se mjeri kvaliteta usluge je vrijeme za
uspostavu poziva. Parametri koji utječu na kvalitetu usluge su kodek, performanse
uređaja i performanse mreže (kapacitet, zagušenje, mehanizmi kojima se rješava zagušenje).
Rezultati mjerenja su pokazali da VoLTE ima nisko vrijeme za uspostavu
poziva, a u isto vrijeme zadržava kvalitetu poziva. Razlog tome je spomenuta prioritizacija
glasovnih paketa i razni optimizacijski postupci u radijskoj pristupnoj mreži.
VoLTE je podloga i za buduću petu generaciju mreža te za razliku od ostalih prijenosa
govora u domeni komutacije paketa omogućava sigurnosne mehanizme za osiguravanje
kvalitete prijenosa govora čak i ako su loši uvjeti u mreži.

Abstract (english)

Nowadays, mobile voice services represent one of the key services provided by
mobile network operators. Hence, it is very important to ensure a quality of service
and transmission of voice services. The new generation networks aim to introduce a
shared infrastructure and integration of services for fixed and mobile networks. Infrastructure
is IMS-based and enables "all-IP" solution for new generation networks
and transmission of all services, even voice, in packet switched domain. In early start
of deployment of networks, voice was only transmitted in circuit switch domain and
technology like that was ensuring good voice quality but not efficiency. Because of
that there are many interoperable solutions like Voice over IP or Circuit Switched Fallback
which conducts fallback on 2G/3G networks and uses circuit switched domain.
VoLTE transmits all data in packet switched domain and quality of service is ensured
by prioritization of packets so voice packets have bigger priority than the rest of
the data packets. One of key performance indicators which are used for measuring
quality of service is call setup time. Parameters which affect quality of service are
codec, performance of mobile devices and network performance (bandwidth, congestion).
Measurement results showed that VoLTE ensures quality of service because of
prioritization of voice packets and that it has short call setup time because of optimization
procedures in radio network. VoLTE is foundation for future 5G networks
because it provides mechanisms for assuring quality of service even in poor network
conditions.

• Keywords: Mobilne mreže; LTE; VoLTE; Vrijeme uspostave poziva; Kvaliteta usluge
• Keywords (english): Mobile networks; LTE; Voice over LTE; Call Setup Time; Quality of Service
• Language: croatian
• URN:NBN: urn:nbn:hr:168:218404
• Study programme: Title: Information and Communication Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka informacijske i komunikacijske tehnologije (magistar/magistra inženjer/inženjerka informacijske i komunikacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2018-02-06 11:11:11