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Paper Abstract and Keywords
Presentation 2016-05-16 14:30
[Poster Presentation] An Experimental Study on Network-Listening Based Synchronization with Loop-Back Self-Interference Canceller
Sho Nabatame, Mitsukuni Konishi, Atsushi Nagate, Teruya Fujii (SoftBank) SR2016-4 SRW2016-4
Abstract (in Japanese) (See Japanese page) 
(in English) The overlaid cell structure, in which a large number of small cells are deployed in a macro-cell coverage area, is considered to be a promising approach in order to accommodate rapidly increasing mobile data traffic. In the overlaid cell structure, eICIC (enhanced Inter-Cell Interference Coordination) is an essential technique to avoid the interference between the macro cells and the small cells when co-channel deployment is used. Because eICIC conducts interference coordination in the time domain, accurate timing synchronization is required between the macro cells and the small cells. We have proposed a network-listening based synchronization method, which enables accurate synchronization even indoors without receiving GPS signal. In the proposed method, a small-cell eNB receives a macro-cell downlink synchronization signal and establishes synchronization with the macro-cell eNB. However, we need to update synchronization periodically and receive a macro-cell signal even while there is a loop-back interference signal from the small-cell eNB itself. In order to solve the problem, we have proposed a method to mute the transmission and avoid loop-back self-interference. Although this works well, it is an issue that the spectral efficiency is deteriorated by the signal stopping. In this paper, we propose a synchronization method that cancels loop-back self-interference without stopping the transmission of small-cell eNB and clarify the effect of the proposed method by computer simulations and laboratory experiments using the first-ever prototype system.
Keyword (in Japanese) (See Japanese page) 
(in English) LTE-Advanced / Layered cell configuration / HetNet / Small cell / Timings synchronization / Network listening / Radio-interface based synchronization /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 29, SR2016-4, pp. 9-14, May 2016.
Paper # SR2016-4 
Date of Issue 2016-05-09 (SR, SRW) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF SR2016-4 SRW2016-4

Conference Information
Committee SR SRW  
Conference Date 2016-05-16 - 2016-05-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Hotel Lasaretti, Oulu, Finland 
Topics (in Japanese) (See Japanese page) 
Topics (in English) SmartCom2016 
Paper Information
Registration To SR 
Conference Code 2016-05-SR-SRW 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An Experimental Study on Network-Listening Based Synchronization with Loop-Back Self-Interference Canceller 
Sub Title (in English)  
Keyword(1) LTE-Advanced  
Keyword(2) Layered cell configuration  
Keyword(3) HetNet  
Keyword(4) Small cell  
Keyword(5) Timings synchronization  
Keyword(6) Network listening  
Keyword(7) Radio-interface based synchronization  
Keyword(8)  
1st Author's Name Sho Nabatame  
1st Author's Affiliation SoftBank Corp (SoftBank)
2nd Author's Name Mitsukuni Konishi  
2nd Author's Affiliation SoftBank Corp (SoftBank)
3rd Author's Name Atsushi Nagate  
3rd Author's Affiliation SoftBank Corp (SoftBank)
4th Author's Name Teruya Fujii  
4th Author's Affiliation SoftBank Corp (SoftBank)
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Speaker Author-1 
Date Time 2016-05-16 14:30:00 
Presentation Time 100 minutes 
Registration for SR 
Paper # SR2016-4, SRW2016-4 
Volume (vol) vol.116 
Number (no) no.29(SR), no.30(SRW) 
Page pp.9-14 
#Pages
Date of Issue 2016-05-09 (SR, SRW) 


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