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Cell Acquisition and Synchronization for Unlicensed NB-IoT
Linköping University, Department of Electrical Engineering, Communication Systems.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Narrowband Internet-of-Things (NB-IoT) is a new wireless technology designed to support cellular networks with wide coverage for a massive number of very cheap low power user devices. Studies have been initiated for deployment of NB-IoT in unlicensed frequency bands, some of which demand the use of a frequency-hopping scheme with a short channel dwell time. In order for a device to connect to a cell, it must synchronize well within the dwell time in order to decode the frequency-hopping pattern. Due to the significant path loss, the narrow bandwidth and the device characteristics, decreasing the synchronization time is a challenge. This thesis studies different methods to decrease the synchronization time for NB-IoT without increasing the demands on the user device. The study shows how artificial fast fading can be combined with denser reference signalling in order to achieve improvements to the cell acquisition and synchronization procedure sufficient for enabling unlicensed operation of NB-IoT.

Abstract [sv]

Narrowband Internet-of-Things (NB-IoT) är en ny trådlös teknik som är designad för att hantera mobilnät med vidsträckt täckning för ett massivt antal mycket billiga och strömsnåla användarenheter. Studier har inletts för att operera NB-IoT i olicensierade frekvensband, varav några kräver att frekvenshoppande spridningsspektrum, med kort uppehållstid per kanal, används. För att en användarenhet ska kunna ansluta till en basstation måste den slutföra synkronisingsfasen inom uppehållstiden, så att basstationens hoppmönster kan avkodas. På grund utav den stora signalförsvagningen, den smala bandbredden och användarenhetens egenskaper är det en stor utmaning att förkorta synkroniseringstiden. Detta examensarbete studerar olika metoder för att förkorta synkroniseringstiden i NB-IoT utan att öka kraven på användarenheten. Arbetet visar att artificiell snabb-fädning kan kombineras med tätare referenssignalering för att uppnå förbättringar i synkroniseringsprocessen som är tillräckliga för att möjliggöra operation av NB-IoT i olicensierade frekvensband.

Place, publisher, year, edition, pages
2017. , p. 74
Keywords [en]
Narrowband Internet-of-Things, NB-IoT, unlicensed, cell search, cell acquisition, synchronization, artificial fast fading, binary sequences, peak sidelobe level
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:liu:diva-139862ISRN: LiTH-ISY-EX--17/5082--SEOAI: oai:DiVA.org:liu-139862DiVA, id: diva2:1134090
External cooperation
Ericsson Research
Subject / course
Communication Systems
Presentation
2017-08-18, 10:15 (English)
Supervisors
Examiners
Available from: 2017-08-18 Created: 2017-08-17 Last updated: 2017-08-18Bibliographically approved

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CiteExportLink to record
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Citation style
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