{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,20]],"date-time":"2026-02-20T19:05:36Z","timestamp":1771614336014,"version":"3.50.1"},"reference-count":29,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2020,10,14]],"date-time":"2020-10-14T00:00:00Z","timestamp":1602633600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JSAN"],"abstract":"<jats:p>Heterogeneous networks (HetNets), which are combined with a macrocell and picocell in the same coverage, are expected to further increase the system capacity in fifth-generation mobile systems and beyond. In HetNets, the cell range expansion (CRE) technique plays an important role and can allow more user equipment (UE) to access the picocell, i.e., virtually expand the picocell coverage. However, conventional CRE techniques that provide a fixed cell selection offset (CSO) for all UE may worsen user throughput if UE is forced to connect to the picocell because the received signal-to-interference plus noise ratio of the UE becomes lower. Therefore, we propose a personal picocell scheme using an adaptive control CRE technique to improve user throughput in which different CSOs are assigned to UE to form each optimal picocell for each UE. In this paper, we first describe the aspects and algorithm of the proposed scheme. Then, we show the user throughput for adaptive control CRE in comparison with conventional CRE by using system-level computer simulations for the two types of HetNets, i.e., single-band and multi-band HetNets. In the simulations, we first clarify the optimal parameters of the adaptive control CRE. We then show the average and 5-percentile user throughput of the optimized adaptive control CRE in comparison with that of conventional CRE. From these results, we confirmed that the personal picocell scheme using the adaptive control CRE can improve the 5-percentile user throughput while maintaining the average user throughput compared with that of conventional CRE.<\/jats:p>","DOI":"10.3390\/jsan9040048","type":"journal-article","created":{"date-parts":[[2020,10,14]],"date-time":"2020-10-14T08:59:22Z","timestamp":1602665962000},"page":"48","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Personal Picocell Scheme Using Adaptive Control CRE in Heterogeneous Mobile Networks"],"prefix":"10.3390","volume":"9","author":[{"given":"Kento","family":"Fujisawa","sequence":"first","affiliation":[{"name":"Graduate School of Engineering, Kogakuin University, Tokyo 163-8677, Japan"}]},{"given":"Fumiya","family":"Kemmochi","sequence":"additional","affiliation":[{"name":"Graduate School of Engineering, Kogakuin University, Tokyo 163-8677, Japan"}]},{"given":"Hiroyuki","family":"Otsuka","sequence":"additional","affiliation":[{"name":"Department of Information and Communications Engineering, Kogakuin University, Tokyo 163-8677, Japan"}]}],"member":"1968","published-online":{"date-parts":[[2020,10,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1065","DOI":"10.1109\/JSAC.2014.2328098","article-title":"What Will 5G Be?","volume":"32","author":"Andrews","year":"2014","journal-title":"IEEE J. Sel. Areas Commun."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1109\/MVT.2014.2380581","article-title":"Horizon 2020 and Beyond: On the 5G Operating System for a True Digital Society","volume":"10","author":"Soldani","year":"2015","journal-title":"IEEE Veh. Technol. Mag."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1397","DOI":"10.1587\/transcom.E98.B.1397","article-title":"5G Radio Access: Requirements, Concept and Experimental Trials","volume":"E98-B","author":"Nakamura","year":"2015","journal-title":"IEICE Trans. Commun."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1109\/MVT.2015.2496240","article-title":"Massive MIMO and mmWave for 5G Wireless HetNet: Potential Benefits and Challenges","volume":"11","author":"Bogale","year":"2016","journal-title":"IEEE Veh. Technol. Mag."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1352","DOI":"10.1587\/transcom.2018TTI0002","article-title":"Recent Activities of 5G Experimental Trials on Massive MIMO Technologies and 5G System Trials Toward New Services Creation","volume":"E102-B","author":"Okumura","year":"2019","journal-title":"IEICE Trans. Commun."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Ishii, H., Kishiyama, Y., and Takahashi, H. (2012, January 3\u20137). A novel architecture for LTE-B:C-plane\/U-plane split and Phantom Cell concept. Proceedings of the 2012 IEEE Globecom Workshops; Institute of Electrical and Electronics Engineers (IEEE), Anaheim, CA, USA.","DOI":"10.1109\/GLOCOMW.2012.6477646"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1109\/MWC.2010.5490974","article-title":"LTE-advanced: Next-generation wireless broadband technology [Invited Paper","volume":"17","author":"Ghosh","year":"2010","journal-title":"IEEE Wirel. Commun."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Dahlman, E., Dimou, K., Parkvall, S., and Tullberg, H. (2013, January 6\u20138). Future wireless access small cells and heterogeneous deployments. Proceedings of the ICT 2013 Institute of Electrical and Electronics Engineers (IEEE), Casablanca, Morocco.","DOI":"10.1109\/ICTEL.2013.6632154"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1109\/TNET.2013.2246820","article-title":"Algorithms for Enhanced Inter-Cell Interference Coordination (eICIC) in LTE HetNets","volume":"22","author":"Deb","year":"2013","journal-title":"IEEE\/ACM Trans. Netw."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"101903","DOI":"10.1109\/ACCESS.2020.2997761","article-title":"Multi-Objective Optimization of Green Small Cell Allocation for IoT Applications in Smart City","volume":"8","author":"Chi","year":"2020","journal-title":"IEEE Access"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Dghais, W., Souilem, M., Chi, H.R., Radwan, A., and Taha, A.-E.M. (2020, January 7\u201311). Dynamic Clustering for Power Effective Small Cell Deployment in HetNet 5G Networks. Proceedings of the ICC 2020\u20132020 IEEE International Conference on Communications (ICC); Institute of Electrical and Electronics Engineers (IEEE), Dublin, Ireland.","DOI":"10.1109\/ICC40277.2020.9149059"},{"key":"ref_12","unstructured":"(2010). Potential Performance of Range Expansion in Macro-Pico Deployment (R1\u2013104355), 3GPP. TSG RAN WG1."},{"key":"ref_13","unstructured":"Tian, P., Tian, H., Zhu, J., Chen, L., and She, X. (2011, January 14\u201316). An adaptive bias configuration strategy for range extension in LTE-advanced heterogeneous networks. Proceedings of the IET International Conference on Communication Technology and Application (ICCTA 2011); Institution of Engineering and Technology (IET), Beijing, China."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1084","DOI":"10.1109\/LCOMM.2011.082611.111387","article-title":"Capacity and Fairness Analysis of Heterogeneous Networks with Range Expansion and Interference Coordination","volume":"15","author":"Guvenc","year":"2011","journal-title":"IEEE Commun. Lett."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Kikuchi, K., and Otsuka, H. (2012, January 9\u201312). Proposal of adaptive control CRE in heterogeneous networks. Proceedings of the 2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications\u2014(PIMRC); Institute of Electrical and Electronics Engineers (IEEE), Sydney, NSW, Australia.","DOI":"10.1109\/PIMRC.2012.6362914"},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Kikuchi, K., and Otsuka, H. (2013, January 8\u201311). Parameter optimization for adaptive control CRE in HetNet. Proceedings of the 2013 IEEE 24th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC); Institute of Electrical and Electronics Engineers (IEEE), London, UK.","DOI":"10.1109\/PIMRC.2013.6666723"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"117","DOI":"10.1587\/comex.4.117","article-title":"Adaptive control CRE and its throughput performance in HetNet","volume":"4","author":"Nakazawa","year":"2015","journal-title":"IEICE Commun. Express"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Nakazawa, S., Naganuma, N., and Otsuka, H. (2017, January 8\u201311). Enhanced adaptive control CRE in heterogeneous networks. Proceedings of the 2017 14th IEEE Annual Consumer Communications & Networking Conference (CCNC); Institute of Electrical and Electronics Engineers (IEEE), Las Vegas, NV, USA.","DOI":"10.1109\/CCNC.2017.7983206"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Naganuma, N., Nakazawa, S., Suyama, S., Okumura, Y., and Otsuka, H. (2016, January 5\u20138). Adaptive control CRE technique for eICIC in HetNet. Proceedings of the 2016 Eighth International Conference on Ubiquitous and Future Networks (ICUFN); Institute of Electrical and Electronics Engineers (IEEE), Vienna, Austria.","DOI":"10.1109\/ICUFN.2016.7536967"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Fujisawa, K., Kemmochi, F., and Otsuka, H. (2019, January 22\u201325). Personal-Cell Scheme Using Adaptive Control CRE for Multicarrier HetNets. Proceedings of the 2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall); Institute of Electrical and Electronics Engineers (IEEE), Honolulu, HI, USA.","DOI":"10.1109\/VTCFall.2019.8891193"},{"key":"ref_21","unstructured":"Mu, Q., Liu, L., Chen, L., and Jiang, Y. (2013, January 24\u201326). CQI table design to support 256 QAM in small cell environment. Proceedings of the 2013 International Conference on Wireless Communications and Signal Processing; Institute of Electrical and Electronics Engineers (IEEE), Hangzhou, China."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Iwamoto, M., Matsuoka, S., Iwasaki, H., and Otsuka, H. (2014, January 28\u201330). Transmission performance of OFDM with 1024-QAM in the presence of EVM degradation. Proceedings of the 2014 IEEE Asia Pacific Conference on Wireless and Mobile; Institute of Electrical and Electronics Engineers (IEEE), Bali, Indonesia.","DOI":"10.1109\/APWiMob.2014.6920262"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Ota, T., Nakamura, M., and Otsuka, H. (2017, January 4\u20137). Performance evaluation of OFDM-based 256- and 1024-QAM in multipath fading propagation conditions. Proceedings of the 2017 Ninth International Conference on Ubiquitous and Future Networks (ICUFN); Institute of Electrical and Electronics Engineers (IEEE), Milan, Italy.","DOI":"10.1109\/ICUFN.2017.7993849"},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Naganuma, N., Osawa, K., Mashino, J., Suyama, S., and Otsuka, H. (2018, January 10\u201312). Proposal of CQI table switching control method corresponding to 256-QAM for CRE in HetNet. Proceedings of the 2018 International Conference on Information Networking (ICOIN); Institute of Electrical and Electronics Engineers (IEEE), Chiang Mai, Thailand.","DOI":"10.1109\/ICOIN.2018.8343135"},{"key":"ref_25","unstructured":"ITU Report, M.2135-1 (2009). Guidelines for Evaluation of Radio Interface Technologies for IMT-Advanced, International Telecommunication Union."},{"key":"ref_26","unstructured":"(2017). Evolved Universal Terrestrial Radio Access (E-UTRA); Introduction of 1024 Quadrature Amplitude Modulation (QAM) in LTE downlink (Release 15), 3GPP. Technical report No. 36.783."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"272","DOI":"10.1587\/comex.2018XBL0053","article-title":"Transmission performance of OFDM-based 1024-QAM in multipath fading conditions","volume":"7","author":"Tian","year":"2018","journal-title":"IEICE Commun. Express"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Otsuka, H., Tian, R., and Senda, K. (2019). Transmission Performance of an OFDM-Based Higher-Order Modulation Scheme in Multipath Fading Channels. J. Sens. Actuator Netw., 8.","DOI":"10.3390\/jsan8020019"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Kemmochi, F., Fujisawa, K., and Otsuka, H. (2019, January 22\u201325). Potential Design for Modulation and Coding Scheme in mmWave Multicarrier HetNets. Proceedings of the 2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall); Institute of Electrical and Electronics Engineers (IEEE), Honolulu, HI, USA.","DOI":"10.1109\/VTCFall.2019.8891460"}],"container-title":["Journal of Sensor and Actuator Networks"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2224-2708\/9\/4\/48\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T10:20:52Z","timestamp":1760178052000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2224-2708\/9\/4\/48"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,10,14]]},"references-count":29,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2020,12]]}},"alternative-id":["jsan9040048"],"URL":"https:\/\/doi.org\/10.3390\/jsan9040048","relation":{},"ISSN":["2224-2708"],"issn-type":[{"value":"2224-2708","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,10,14]]}}}