OFDM Relay Cognitive Radio Multiple Antennas Resource Allocation Full Duplex Spectrum Sensing Synchronization Spectrum Sharing Interference Cancellation Channel Estimation Feedback Stochastic Geometry Bi-directional Energy Harvesting Heterogeneous Networks FBMC HetNet Equalization relay networks Ultra Low Power TVWS MIMO interference SC-FDMA CDMA Duplex channel capacity interference suppression 5G Reliability C-V2V in-band full-duplex system OCBT CLI body area networks 5G mobile communication antenna arrays NR positioning health care Resource sharing Location-based LTE-TDD FS-NOMA Power allocation OTDOA hybrid control overhead estimated position overlapping resource block management amplify and forward communication power uncertainty CoMP quality of service cellular radio Rat-dependent positioning telecommunication traffic Handoff Femtocell inter user interference UFMC mode selection GFDM QAM Zigbee frame structure Vehicular communication Vehicle-to-vehicle communication non-orthogonal multiple access QR Factorization Spatial capacity LTE-based V2V Number of training blocks Communication range user fairness Mode 3 resource selection distributed mode maximum likelihood method Metaheuristics cross-link interference Dynamic TDD Uplink SCMA system V2X DQN estimated position updating —Device-to-device (D2D) D-TDD dynamic HetNet indoor positioning spectrum partitioning - Computation offloading multi-access edge computing P-NOMA partial overlap Subband filtering Multi-user Receiver reinforcement learning RSRP weighting smart factory
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