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Author:Laine, Teemu
Title:New synchronization metrics for packet networks
Uudet synkronointimetriikat pakettiverkkoihin
Publication type:Master's thesis
Publication year:2010
Pages:[8] + 92      Language:   eng
Department/School:Tietoliikenne- ja tietoverkkotekniikan laitos
Main subject:Tietoverkkotekniikka   (S-38)
Supervisor:Aalto, Samuli
Instructor:Pietiläinen, Antti
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201203131547
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  944   | Archive
Keywords:mobile backhaul synchronization
Timing over Packet (ToP)
frequency synchronization
phase synchronization
time synchronization
MATIE
MAFE
TDEV
MTIE
PLL filter simulation
mobiili-verkkojen synkronointi
Timing over Packet (ToP)
taajuussynkronointi
vaihesynkronointi
aikasynkronointi
MATIE
MAFE
TDEV
MTIE
orjakellon simulointi
Abstract (eng): This thesis introduces the challenging research area of network synchronization over packet-switched transport networks (also known as timing over packet (ToP)).
Synchronization in telecom terminology consists of frequency, phase and time synchronization which require different approaches and performance metrics.
Since the focus is on cellular network synchronization, technology requirements pose a strict demand for the new packet-based mobile backhaul replacing a traditional TDM-based infrastructure as a common timing reference distributor.

Consequently, synchronization metrics are the crucial performance indicators and estimators needed for system designing and performance verification related to ToP solutions.
Packet metrics derived from the traditional synchronization metrics as well as completely new metrics such as MATIE and MAFE are analyzed and studied in great detail.
Furthermore, an improved MATIE is also developed in a search for better performance.

Several measurements are conducted and from the several data recorder the implemented synchronization metrics are calculated and analyzed against simulated and real packet slave clock implementations etc.
As a result, MAFE is proven to be the best frequency stability estimate and MATIE (or MATIE modification) one of the best phase stability estimates but not that applicable to satisfy the traditional MTIE masks.
MTIE from simulated clock output would be the most applicable.
Abstract (fin): Tämä työ esittelee verkkojen synkronoinnin haasteet pakettikytkentäisten siirto-verkkojen yli esimerkiksi mobiili-verkon tukiasemiin, joka tunnetaan nimellä ToP (timing over packet).
Tässä yhteydessä synkronisaatio tarkoittaa yhteisen taajuuden, vaiheen tai ajan mahdollistamista, jotka vaativat hieman erilaisia menetelmiä ja metriikoita.
Työssä keskitytään mobiili-verkkojen synkronointiin, joissa tekniikka asettaa tarkat vaatimukset synkronoinnin tarkkuudelle.
Siirtoverkkojen muuttuminen aikajakoisista tekniikoista pakettikytkentäiseen vaatii synkronoinnin uudelleen miettimistä.

Synkronointimetriikat ovat tärkeitä suorituskykyindikaattoreita ja -ennustajia, joita tarvitaan ToP -järjestelmän suunnittelussa ja testauksessa.
Perinteisistä kellometriikoista johdetut pakettimetriikat sekä täysin uudet pakettimetriikat on tutkittu ja analysoitu tarkkaan.
Näiden lisäksi uutta MATIE -metriikkaa yritettiin parantaa paremman suorituskyvyn toivossa.

Tutkimuksessa on tehty useita mittauksia ja tietokoneella toteutettuja metriikoita sovellettiin saatuihin mittaustuloksiin sekä verrattiin itse toteutettuihin simuloituihin orjakelloihin.
Tuloksena saatiin, että MAFE osoittautui kestäväksi ja toimivaksi taajuusstabiilisuusmittariksi ja MATIE (tai paranneltu MATIE) on toimiva, mutta ei kovin käyttö-kelpoinen perinteisten maskien kanssa.
Parhaaksi ratkaisuksi osoittautui MTIE -metriikka simuloidun orjakellon ulostulosta.
ED:2010-10-14
INSSI record number: 41080
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