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Make yourself at home: A comparative study of VoLTE Roaming architectures
KTH, School of Information and Communication Technology (ICT). (CCS)
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

While the data traffic has increased through the years, the average revenue per user (ARPU) remains flat. Thus, mobile network operators need to find a solution for how to support the growing amounts of traffic at fixed revenue per user. Similarly, the number of roaming users has increased, but according to recent European Union (EU) regulations, mobile network operators have to lower their charges for roaming to zero by June 2017. While this decrease in roaming charges will benefit European roaming users, mobile network operators have to cover their expenses for their own roaming subscribers, thus they have to find a way to lower their operational expenses (OPEX). Additionally, it is important for operators to consider how they might actually benefit from the removal of roaming charges.

This project will focus on roaming in 4th generation (4G) mobile networks. A common roaming scenario would include three different networks: the Home Public Land Mobile Network (HPLMN) a transit network, and a Visited Public Land Mobile Network (VPLMN). Normally, both the signaling traffic and the media payloads traverse these networks, thus causing additional latencies and increasing OPEX. However, in recent years, a new mechanism, called local breakout (LBO), was introduced that can lower the costs of roaming and avoid unnecessary traffic while meeting a roaming user's needs.

The goal of LBO is to decrease the operator's OPEX when supporting roaming subscribers. A secondary goal of LBO is to reduce the latencies experienced by roaming subscribers during their sessions. Achieving both of these goals will satisfy both operators and consumers.

This thesis project analyzes Voice over Long Term Evolution roaming with the aim of presenting the various alternative architectures for Voice over LTE roaming, compare them in different scenarios, and evaluating them based on criteria defined during this project. The conclusion is that the best solution that is applicable to all the mobile network operators for all the possible roaming scenarios does not exist yet. The various VoLTE roaming architectures can be chosen by the mobile network providers according to their needs.

Abstract [sv]

Datatrafiken har ökat genom åren men den genomsnittliga intäkten per användare (ARPU) är fortfarande oförändrad. Mobilnätsoperatörer bör hitta en lösning för att kunna stödja den växande mängden trafik på fasta intäkter per användare. Samtidigt har antalet roaming användare ökat. Enligt de senaste reglerna från Europeiska unionen (EU) måste mobiloperatörer sänka sina roamingkostnader till noll senast juni 2017. Denna minskning av roamingavgifterna kommer att gynna europeiska roaminganvändare, men mobilnätoperatörer måste samtidigt täcka sina kostnader för sina egna roamingabonnenter. Detta medför att mobilnätoperatörer måste hitta ett sätt att sänka sina driftskostnader (OPEX). Dessutom är det viktigt för operatörerna att fundera över hur de faktiskt kan utnyttja denna uteslutning av roamingavgifter.

Detta projekt kommer att fokusera på roaming i den 4:e generationens (4G) mobila nät. Ett vanligt roaming scenario skulle omfatta tre olika nätverk: Home Public Land Mobile Network (HPLMN), transitnätverk, och en Visited Public Land Mobile Network (VPLMN). Vanligen är det både signaleringstrafik och media som passerar dessa nätverk. Det leder till ytterligare latenstider och ökande driftskostnader. Under de senaste åren har en ny mekanism som kallas för Local BreakOut (LBO) införts. Detta används för att sänka kostnaderna för roaming och undvika onödig trafik, samtidigt som den bemöter roaming användarens behov.

Målet med LBO är att minska Operatörens OPEX när den stödjer roaming abonnenter. Ett sekundärt mål av LBO är att minska latensen för roamingabonnenter under sina sessioner. Uppnående av båda dessa mål kommer att tillfredsställa både operatörer och konsumenter.

Detta examensarbete analyserar Voice over Long Term Evolution roaming i syfte att presentera de olika alternativa arkitekturer för Voice over LTE roaming, jämföra dem i olika scenarier, och utvärdera dem utifrån kriterier som fastställs under detta projekt.

Place, publisher, year, edition, pages
2017. , xiv, 52 p.
Series
TRITA-ICT-EX, 2017:1
Keyword [en]
Local breakout, RAVEL, S8HR, VoLTE roaming
Keyword [sv]
Local breakout, RAVEL, S8HR, VoLTE roaming
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-200335OAI: oai:DiVA.org:kth-200335DiVA: diva2:1068217
External cooperation
Telia
Subject / course
Electrical Engineering
Educational program
Master of Science -Communication Systems
Presentation
2017-01-13, Seminar room Grimeton, Isafjordsgatan 22, Kista, 17:00 (English)
Supervisors
Examiners
Available from: 2017-02-01 Created: 2017-02-01 Last updated: 2017-05-17Bibliographically approved

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