OFDM Relay Cognitive Radio Multiple Antennas Resource Allocation Full Duplex Spectrum Sensing Synchronization Spectrum Sharing Interference Cancellation Channel Estimation Feedback Heterogeneous Networks Energy Harvesting Stochastic Geometry Bi-directional Equalization relay networks FBMC HetNet CDMA channel capacity SC-FDMA interference MIMO Ultra Low Power Duplex TVWS CLI in-band full-duplex system D-TDD interference suppression Reliability 5G C-V2V indoor positioning reinforcement learning RSRP weighting User grouping Rat-dependent positioning Communication range multi-access edge computing hybrid - Computation offloading —Device-to-device (D2D) estimated position updating control overhead resource block management estimated position overlapping Femtocell NR positioning frame structure Zigbee body area networks channel estimation error Handoff CoMP packet delay power uncertainty ultra-dense small cell network GFDM antenna arrays 5G mobile communication UFMC WVAN mode selection inter user interference health care Vehicular communication cross-link interference resource selection FS-NOMA Dynamic TDD Number of training blocks Mode 3 Uplink SCMA system Multi-user Receiver LTE-TDD user fairness smart factory V2X Metaheuristics Location-based QR Factorization partial overlap P-NOMA dynamic HetNet spectrum partitioning Cell-free and 5G networks. overloading massive connectivity DQN mMIMO distributed mode non-orthogonal multiple access OTDOA maximum likelihood method Resource sharing Power allocation non-orthogonal multiple access (NOMA)
Status : Presented 
Date : 2015-03 
Title : Impacts of Sub Hub on Connectivity of IEEE 802.15.4 in Healthcare Environments 
Authors : Sungwoo Weon, Seokwon Lee, Sooyong Choi, Jang-Won Lee, and Daesik Hong 
Conference : WCNC 2015 
Abstract : In this paper, we consider IEEE 802.15.4 based wireless body area sensor networks (WBASN) in the healthcare environment. Connectivity is a critical constraint in the healthcare environment. In particular, disconnection from a sensor hub is a significant problem that leads to sensor node orphaning. To address this, we propose to use a sub hub designed to enhance WBASN connectivity. The sub hub understudies the original (main) sensor hub and acts to resolve the problems associated with disconnection. We also propose two protocols for use in operating the sub hub. Each protocol prevents the sensor nodes from being orphaned, and forwards data from the sensor nodes to the original sensor hub. In addition, we evaluate the connectivity performance of our proposed protocols and analyze the disconnection tolerance and the number of packet drops. To demonstrate the performances of the proposed protocols, we developed an IEEE 802.15.4 compliant system level simulator with an OPNET Modeler. Simulation results show the individual merits and the demerits of each of the protocols in terms of connectivity. In addition, the energy efficiency of our proposed protocol is evaluated. 
URL : http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7127613 
Download : http://mirinae.yonsei.ac.kr/?module=file...le_srl=343 

Weon, Sungwoo; Lee, Seokwon; Choi, Sooyong; Lee, Jang-Won; Hong, Daesik, "Impacts of sub hub on connectivity of IEEE 802.15.4 in healthcare environments," Wireless Communications and Networking Conference (WCNC), 2015 IEEE , vol., no., pp.1042,1047, 9-12 March 2015
doi: 10.1109/WCNC.2015.7127613
keywords: {Handover;IEEE 802.15 Standards;Measurement;Medical services;Power demand;Protocols},
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7127613&isnumber=7127309

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» [IEEE WCNC] Sungwoo Weon, Seokwon Lee, Sooyong Choi, Jang-Won Lee, and Daesik Hong, "Impacts of Sub Hub on Connectivity of IEEE 802.15.4 in Healthcare Environments", IEEE WCN 2015 file Presented  2015-03