Title: LTE-indoor: a novel PHY layer design for future 5G indoor femtocell networks

Authors: Kuo-Chang Ting; Jung-Shyr Wu; Chih-Cheng Tseng

Addresses: Minghsin University of Science and Technology, No. 1, Xinxing Rd., Xinfeng Hsinchu 30401, Taiwan ' National Central University, No. 300, Zhongda Rd., Zhongli District, Taoyuan City 32001, Taiwan ' National Ilan University, No. 1, Sec. 1, Shennong Rd., Yilan City, Yilan County 260, Taiwan

Abstract: Small cell technology such as femtocell plays an important role in 5G heterogeneous network especially in the indoor environments. However, it is unreasonable that the design of the PHY layer in femtocell networks follows that of the macrocell since the channel model used in indoor environments is entirely different from that used in urban or rural areas. To boost the PHY throughput of femtocell network, LTE-indoor (LTE-I), a new PHY layer frame structure, is proposed to accommodate more symbols in a slot time as well as to adopt higher order modulations and narrower guard bands. Furthermore, through carrier aggregation (CA) techniques, the PHY layer throughput can be further booted as high as 18.2 Gbps. The proposed LTE-I frame structure also supports the ultra-reliable and low latency communications (URLLC) by making the subcarrier spacing wider to increase the symbol rate with almost no throughput loss.

Keywords: cyclic prefix; delay spreads; femtocell; inter-symbol interference; ISI; long-term evolution; LTE; PHY; licensed-assisted access; LAA; throughput; wireless local area network; WLAN.

DOI: 10.1504/IJAHUC.2020.108427

International Journal of Ad Hoc and Ubiquitous Computing, 2020 Vol.34 No.3, pp.186 - 197

Received: 18 Mar 2019
Accepted: 13 Oct 2019
Published online: 13 Jul 2020 *

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