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Paper Abstract and Keywords
Presentation 2012-10-17 10:50
Investigation on Downlink/Uplink Throughput Performance in Heterogeneous Network Employing Cell Range Expansion for LTE-Advanced
Akihito Morimoto, Nobuhiko Miki, Yukihiko Okumura (NTT DOCOMO) RCS2012-129
Abstract (in Japanese) (See Japanese page) 
(in English) In LTE-Advanced, heterogeneous networks are important to improve further the system throughput per unit area. In heterogeneous network deployment, low power nodes such as femtocells and picocells, which are connected to macrocells via relatively large-latency backhaul, are overlaid onto macrocells. Cell range expansion (CRE), which is a technique for expanding the cell radius of picocells by biasing the reference signal received power in the downlink, is applied to overcome the downlink - uplink imbalance and to obtain an offloading gain. This paper clarifies the impact of the CRE offset value on the user throughput performance in the downlink and uplink, since its effect is different on the links. Furthermore, this paper investigates a method for setting the optimum CRE offset value to maximize the cell-edge user throughput in the downlink and uplink. Simulation results show that when the CRE offset value is set between 8 to 16 dB, the cell-edge user throughput performance can be improved by allocating appropriate resources to protect UEs that connect to the picocells in the downlink. Then, we show that the cell-edge user throughput can be improved by setting the appropriate combination in the target received signal power between the macrocell and picocells according to the CRE offset value, which is decided based on the downlink cell-edge user throughput performance, in the uplink.
Keyword (in Japanese) (See Japanese page) 
(in English) LTE-Advanced / heterogeneous network / cell range expansion / inter-cell interference coordination / transmission power control / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 239, RCS2012-129, pp. 25-30, Oct. 2012.
Paper # RCS2012-129 
Date of Issue 2012-10-10 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2012-129

Conference Information
Committee SR AN USN RCS  
Conference Date 2012-10-17 - 2012-10-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Fukuoka univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) wireless distributed network, general topics 
Paper Information
Registration To RCS 
Conference Code 2012-10-SR-AN-USN-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation on Downlink/Uplink Throughput Performance in Heterogeneous Network Employing Cell Range Expansion for LTE-Advanced 
Sub Title (in English)  
Keyword(1) LTE-Advanced  
Keyword(2) heterogeneous network  
Keyword(3) cell range expansion  
Keyword(4) inter-cell interference coordination  
Keyword(5) transmission power control  
1st Author's Name Akihito Morimoto  
1st Author's Affiliation NTT DOCOMO, Inc. (NTT DOCOMO)
2nd Author's Name Nobuhiko Miki  
2nd Author's Affiliation NTT DOCOMO, Inc. (NTT DOCOMO)
3rd Author's Name Yukihiko Okumura  
3rd Author's Affiliation NTT DOCOMO, Inc. (NTT DOCOMO)
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Date Time 2012-10-17 10:50:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2012-129 
Volume (vol) IEICE-112 
Number (no) no.239 
Page pp.25-30 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2012-10-10 

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