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) spectrum partitioning dynamic HetNet indoor positioning D-TDD - Computation offloading multi-access edge computing P-NOMA partial overlap Subband filtering Multi-user Receiver reinforcement learning RSRP weighting smart factory
Status : Presented 
Date : 2012-10 
Title : Energy-Efficient Spectrum Access for Ultra Low Power Sensor Networks 
Authors : Seokwon Lee, Sungsoo Park, Gosan Noh, Yosub Park and Daesik Hong 
Conference : IEEE MILCOM 
Abstract : This paper investigates a dynamic spectrum access (DSA) scheme for ultra low power sensor networks (ULPSN) in an open spectrum where multiple systems coexist and interfere with each other. Low transmission power and simple communication protocol are significant obstacles for ULPSN to operate in the open spectrum. The DSA has been researched to solve this problem by assuming that coexisting systems can perfectly detect each other. However, this assumption is limited for ULPSN because detection of ULPSN in coexisting system is difficult due to sensitivity limitation of spectrum sensing. As a result, available spectrum is more scarce for ULP system than other coexisting systems. Thus, we derive a new Markov chain model of open spectrum access. Based on the Markov chain mode, we design a DSA scheme to maximize the energy efficiency and investigate the channel access and switch policy of the proposed DSA within the framework of partially observable Markov decision process (POMDP). The simulation results demonstrate that the proposed DSA scheme yields improved energy efficiency and lifetime compared to a random channel selection for ULPSN. 
URL : http://ieeexplore.ieee.org/xpl/articleDe...r+Networks 
Download : http://mirinae.yonsei.ac.kr/?module=file...95fd3c7f74 

Seokwon Lee; Sungsoo Park; Gosan Noh; Yosub Park; Daesik Hong, "Energy-efficient spectram access for ultra low power sensor networks," MILITARY COMMUNICATIONS CONFERENCE, 2012 - MILCOM 2012 , vol., no., pp.1,6, Oct. 29 2012-Nov. 1 2012
doi: 10.1109/MILCOM.2012.6415750
keywords: {Markov processes;energy conservation;low-power electronics;protocols;radio spectrum management;telecommunication power management;wireless sensor networks;DSA scheme;Markov chain model;POMDP;ULPSN;channel access;coexisting systems;communication protocol;dynamic spectrum access scheme;energy efficiency;energy-efficient spectrum access;low transmission power;open spectrum access;partially observable Markov decision process;random channel selection;sensitivity limitation;spectrum sensing;switch policy;ultra low power sensor networks;Energy consumption;Energy efficiency;Interference;Markov processes;Niobium;Sensors;Switches},
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6415750&isnumber=6415559

List of Articles
No.
Status Datesort
2 [Other Conf. Papers] Seokwon Lee, Sungwoo Weon, Sooyong Choi, Jang-won Lee, Changsoon Park, Youngsoo Kim, Young-jun Hong, and Daesik Hong, "Increasing the Life-time of 802.15.4-based Wireless Sensor Networks," BODYNETS 2013, Oct. 2013 file Presented  2013-10 
» [IEEE MILCOM] Seokwon Lee, Sungsoo Park, Gosan Noh, Yosub Park and Daesik Hong, "Energy-Efficient Spectrum Access for Ultra Low Power Sensor Networks", IEEE MILCOM, October 2012 file Presented  2012-10