• Title/Summary/Keyword: Wireless Coexistence

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Cognitive Beamforming Based Smart Metering for Coexistence with Wireless Local Area Networks

  • Lee, Keonkook;Chae, Chan-Byoung;Sung, Tae-Kyung;Kang, Joonhyuk
    • Journal of Communications and Networks
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    • v.14 no.6
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    • pp.619-628
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    • 2012
  • The ZigBee network has been considered to monitor electricity usage of home appliances in the smart grid network. ZigBee, however, may suffer from a coexistence problem with wireless local area network (WLAN). In this paper, to resolve the coexistence problem between ZigBee network and WLAN, we propose a new protocol constructing a cognitive smart grid network for supporting monitoring of home appliances. In the proposed protocol, home appliances first estimates the transmission timing and channel information of WLAN by reading request to send/clear to send (RTS/CTS) frames of WLAN. Next, based on the estimated information, home appliances transmit a data at the same time as WLAN transmission. To manage the interference between WLAN and smart grid network, we propose a cognitive beamforming algorithm. The beamforming algorithm is designed to guaranteeing zero interference to WLAN while satisfying a required rate for smart metering. We also propose an energy efficient rate adaptation algorithm. By slowing down the transmission rate while satisfying an imperceptible impact of quality of service (QoS) of the receiver, the home appliance can significantly save transmit power. Numerical results show that the proposed multiple antenna technique provides reliable communications for smart metering with reduced power comparing to the simple transmission technique.

Analysis on the impact of Mutual Interference between the Wireless Data communication systems within the 2.4㎓ ISM Band Channel environment (2.4 ㎓ ISM대역 채널 환경에서 무선 데이터 시스템간의 상호 간섭 영향 분석)

  • 김성철
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.6
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    • pp.1068-1075
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    • 2004
  • The WLAN(IEEE 802.l1b) and Bluetooth(IEEE 802.15.1) employed on 2.4㎓ ISM band wireless networks provide complementary services within the same environments. Coexistence between the networks will be impaired, if the mutual packets are uncertainty associated the timing or gaussian distance. This paper analyzes the impact of the mutual interference on the services performance in order to develope a method of coexistence between the WLAN and Bluetooth. The analysis is illustrated by examining the symbol error rate versus signal to noise interference ratio in terms of the carrier frequency of set.

Coexistence between Wireless Fidelity and Wireless Microphone in TV Band

  • Cho, In-Kyoung;Lee, Il-Kyoo;Cho, Ju-Phil
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.6 no.3
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    • pp.906-918
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    • 2012
  • Wireless Fidelity (WiFi) and Wireless microphone are assumed to operate on adjacent channels in TV White Spaces(TVWS). The Scenario of WiFi potentially interfering with Wireless microphone is analyzed through Minimum Coupling Loss (MCL) and Spectrum Engineering Advanced Monte Carlo Analysis Tool (SEAMCAT) based on the Monte-Carlo simulation method. In the case of single WiFi interfering with Wireless microphone, the protection distance between WiFi and the Wireless microphone should be at least 25.12 m to avoid WiFi impact on Wireless microphone. When the active number of WiFi is 12, the guard band between WiFi and Wireless microphone should not be less than 4.97 MHz to guarantee that WiFi does not interfere with the Wireless microphone.

Analysis on Coexistence between Unlicensed Wireless Device based on 802.11ah and LTE User Equipment (802.11ah 기반 비면허 무선기기와 LTE 단말기 간 공존 분석)

  • Lee, Il-Kyoo;Park, Yeon-Gyu
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.11
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    • pp.2015-2021
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    • 2017
  • Recently, a lot of attention is fallen to IoT(Internet of Things) for hyper-connected society and the number of unlicensed wireless device has been increasing. Thus, this paper analyzed the impact of unlicensed wireless device on the basis of 802.11ah on licensed LTE user equipment in 900 MHz frequency band for efficient frequency use. As the interference analysis method, Minimum Coupling Loss (MCL) method and Monte Carlo (MC) method were used. In case of one interferer, minimum separation distance between interferer and victim was calculated as about 22 m through the MCL method under the assumption of the worst case. The maximum number of interferer to meet the interference probability of 5% below within a cell radius of the victim was computed as about 3000 by using MC method based on statistical technique. The analysis method and results in this paper are expected to be used for the coexistence between unlicensed wireless device and licensed wireless device.

A Coexistence Mitigation Scheme in IEEE 802.15.4-based WBAN (IEEE 802.15.4 기반 WBAN의 공존 문제 완화 기법)

  • Choi, Jong-hyeon;Kim, Byoung-seon;Cho, Jin-sung
    • Journal of Internet Computing and Services
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    • v.16 no.3
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    • pp.1-11
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    • 2015
  • WBAN(Wireless Body Area Network) operating around the human body aims at medical and non-medical service at the same time. and it is the short-range communication technology requiring low-power, various data rate and high reliability. Various studies is performing for IEEE 802.15.4, because IEEE 802.15.4 can provide high compatibility for operate WBAN among communication standard satisfiable these requirements. Meanwhile, in the case of coexisting many IEEE 802.15.4-based WBAN, signal interference and collision are the main cause that is decreasing data reliability. but IEEE 802.15.4 Standard does not consider about coexistence of many networks. so it needs improvement. In this paper, To solve about this problem, identify coexistence problem of IEEE 802.15.4-based WBAN by preliminary experiments. and propose a scheme to mitigate the reliability decrease at multiple coexistence WBAN. The proposed scheme can be classified in two steps. The first step is avoidance to collision on the CFP through improving data transmission. The second step is mitigation collision through converting channel access method. Proposed scheme is verified the performance by performing comparison experiment with Standard-based WBAN.

Analytical Coexistence Benchmark for Assessing the Utmost Interference Tolerated by IEEE 802.20

  • Abdulla, Mouhamed;Shayan, Yousef R.
    • Journal of Information Processing Systems
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    • v.7 no.1
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    • pp.43-52
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    • 2011
  • Whether it is crosstalk, harmonics, or in-band operation of wireless technologies, interference between a reference system and a host of offenders is virtually unavoidable. In past contributions, a benchmark has been established and considered for coexistence analysis with a number of technologies including FWA, UMTS, and WiMAX. However, the previously presented model does not take into account the mobility factor of the reference node in addition to a number of interdependent requirements regarding the link direction, channel state, data rate and system factors; hence limiting its applicability for the MBWA (IEEE 802.20) standard. Thus, over diverse modes, in this correspondence we analytically derived the greatest aggregate interference level tolerated for high-fidelity transmission tailored specifically for the MBWA standard. Our results, in the form of benchmark indicators, should be of particular interest to peers analyzing and researching RF coexistence scenarios with this new protocol.

Interference Avoidance Technology Using Cognitive UWB in Ultra Wideband Systems (Cognitive UWB 기술을 이용한 UWB 시스템에서의 간섭 회피 기술)

  • Hwang, Jae-Ho;Sohn, Sung-Hwan;Lee, Sung-Jun;Kim, Jae-Moung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.8A
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    • pp.836-846
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    • 2007
  • Wireless Communication is playing a key role in implementing the ubiquitous society. However, due to the increasing wireless and mobile devices occupying the spectrum, the frequency resources are believed to become more and more limited. In order to deal with the problem, coexistence is considered to be a effective method to improve the efficiency of spectrum utilization between several different systems. Here, we utilize the UWB system to realize the coexistence, because it is an ultra wide band system which can co-exist with other narrow band systems. On the other hand, Cognitive Radio technology is an intelligent technology which can sense the spectrum environment and adaptively adjust the parameters for wireless transmission. In this paper, by using Cognitive UWB, the spectrum efficiency of the transmission channels is largely improved; Furthermore, the interference to other systems can be effectively avoided.

Ultra-wideband Coexistence with WiBro

  • Yoon, Young-Keun;Hong, Heon-Jin;Choi, Ik-Guen
    • ETRI Journal
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    • v.29 no.2
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    • pp.234-236
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    • 2007
  • Interference effects of ultra-wideband devices using the frequency band from 3.1 to 10.6 GHz on wireless broadband are evaluated. The ultra-wideband emission power spectral density that would be necessary to protect a wireless broadband station is considered. Also, an analytic scheme based on a system level simulation of a WiBro system is proposed.

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IEEE 802.19 무선 상호공존 표준화 동향

  • Gang, Hyeon-Deok;Park, Ae-Sun;Bang, Seung-Chan
    • Information and Communications Magazine
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    • v.33 no.10
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    • pp.24-30
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    • 2016
  • 본고에서는 IEEE 802.19 무선 상호공존(Wireless Coexistence) 워킹그룹(Working Group)의 구성 및 역할, TV 우휴대역 주파수 공유 시스템간 상호공존 표준기술 및 현재 논의가 진행중인 일반허가접속(General Authorized Access) 주파수 공유시스템간 상호공존 표준기술과 자동차 환경에서의 주파수 공유시스템간 상호공존 표준기술을 소개하고, 비면허대역 LTE(Long Term Evolution)와 무선랜(Wireless Local Area Network, WLAN) 시스템과의 주파수 공유 등의 무선상호공존 이슈들과 관련 표준화 동향에 대해 알아본다.