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Paper Abstract and Keywords
Presentation 2013-01-31 10:45
BBU-RRH Switching Schemes for Centralized RAN
Shinobu Nanba, Takayuki Warabino, Takahiro Hayashi (KDDI R&D) SIP2012-93 RCS2012-250
Abstract (in Japanese) (See Japanese page) 
(in English) Mobile data traffic has been increasing at a rapid pace over the past few years due to the rise of both smartphones and tablets. Small cell deployments are one of the most effective ways to increase system capacity by improving the spatial reuse of radio resources for the explosive increase in traffic loads. However, it leads to be a large cost impact for operators. Centralized RAN (C-RAN) has been proposed, which has the potential ability to reduce network costs due to reductions in civil work and/or electricity costs at local base station sites by centralizing baseband units to the center side. Moreover, C-RAN can be expected to further reduce network costs using baseband unit (BBU) pooling functions in which the centralized BBU resources can be dynamically allocated to remote radio heads (RRHs) depending on traffic load. This paper proposes semi-static and adaptive BBU-RRH switching schemes for C-RAN and evaluates their effectiveness through simulations. Under conditions of 100 RRHs, here, a RRH is comparable to a cell, and traffic distribution with a typical traffic profile in office (business) area, we confirmed that the number of BBUs can be reduced by 26% and 47% for semi-static and adaptive schemes, respectively, compared with conventional cell deployment.
Keyword (in Japanese) (See Japanese page) 
(in English) Centralized RAN / BBU-RRH switching schemes / BBU pooling / / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 424, RCS2012-250, pp. 73-78, Jan. 2013.
Paper # RCS2012-250 
Date of Issue 2013-01-24 (SIP, RCS) 
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)
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Conference Information
Committee SIP RCS  
Conference Date 2013-01-31 - 2013-02-01 
Place (in Japanese) (See Japanese page) 
Place (in English) Viewport-Kure-Hotel (Kure) 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2013-01-SIP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) BBU-RRH Switching Schemes for Centralized RAN 
Sub Title (in English)  
Keyword(1) Centralized RAN  
Keyword(2) BBU-RRH switching schemes  
Keyword(3) BBU pooling  
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1st Author's Name Shinobu Nanba  
1st Author's Affiliation KDDI R&D Laboratories, Inc. (KDDI R&D)
2nd Author's Name Takayuki Warabino  
2nd Author's Affiliation KDDI R&D Laboratories, Inc. (KDDI R&D)
3rd Author's Name Takahiro Hayashi  
3rd Author's Affiliation KDDI R&D Laboratories, Inc. (KDDI R&D)
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Date Time 2013-01-31 10:45:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # SIP2012-93, RCS2012-250 
Volume (vol) vol.112 
Number (no) no.423(SIP), no.424(RCS) 
Page pp.73-78 
#Pages
Date of Issue 2013-01-24 (SIP, RCS) 


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