• Title, Summary, Keyword: wireless local area network(WLAN)

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WLAN Security Access Protocol for Rapid Initial Link Setup Process (신속한 초기 링크 셋업 과정을 위한 WLAN 보안 접속 프로토콜)

  • Kim, Min-Hee;Park, Chang-Seop
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.25 no.6
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    • pp.1515-1523
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    • 2015
  • It has been prevalent to be serviced through WLAN(Wireless Local Area Network) as a variety of mobile devices have been introduced. If the number of mobile devices increases rapidly for the network access in a limited range of ESS(Extended Service Set), a lengthy connection delays are induced due to the initial link setup process of the IEEE 802.11i which is WLAN security standard. In this paper, we propose a new initial link setup protocol which can be executed in the ESS area of WLAN.

Performance analysis of private multimedia caching network based on wireless local area network (WLAN 기반 개인형 멀티미디어 캐싱 네트워크 성능 분석)

  • Ban, Tae-Won;Kim, Seong Hwan;Ryu, Jongyeol;Lee, Woongsup
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.8
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    • pp.1486-1491
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    • 2017
  • In this paper, we propose a private multimedia caching scheme based on wireless local area network (WLAN) to improve the quality of service for high capacity and high quality multimedia streaming services which are recently increasing and to reduce the traffic load of core networks. The proposed caching scheme stores multimedia in the storage device mounted on WLAN APs and provides streaming services on its own without Internet connection in accordance with the request from clients. We have implemented a test network based on real commercial networks and measured the performance of the proposed caching scheme in terms of frames per second (FPS) and buffering time. According to the performance measurement results, the proposed caching scheme can reduce the average buffering time by 73.3% compared to the conventional streaming scheme. In addition, the proposed caching scheme can also improve the average FPS by 71.3% compared to the conventional streaming scheme.

Performance Improvement Method of IEEE 802.11 WLAN DCF (IEEE 802.11 WLAN에서의 DCF 성능개선 방안)

  • Park, doo-jin;Ko, dong-yub;Lim, seog-ku
    • Proceedings of the Korea Contents Association Conference
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    • pp.130-134
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    • 2007
  • DCF(Distributed Coordination Function) of IEEE 802.11 WLAN(Wireless Local Area Network) MAC Layer apply to CSMA/CA(Carrier Sense Multiple Access with Collision Avoidance) for solution of collision when the station try to access at the same time. But DCF happens falling performance as increasing a number of stations. In this paper, we suggest algorithm that improved performance in congestion. And we compare DCF, DCF+ and proposed algorithm respect to saturation throughput, delay, collision rate and drop rate using NS2(Network Simulator 2) simulation tool.

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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.

Indoor Positioning Using WLAN Signal Strength (무선랜의 신호세기를 이용한 실내 측위)

  • Kim, Suk-Ja;Lee, Jin-Hyun;Jee, Gyu-In;Lee, Jang-Gyu;Kim, Wuk
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.8
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    • pp.742-747
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    • 2004
  • Outdoors we can easily acquire our accurate location by GPS. However, the GPS signal can't be acquired indoors because of its weak signal power level. Adequate positioning method is demanded for many indoor positioning applications. At present, wireless local area network (WLAN) is widely installed in various areas such as airport, campus, and park. This paper proposes a positioning algorithm using WLAN signal strength to provide the position of the WLAN user indoors. There are two methods for WLAN based positioning, the signal propagation method uses signal strength model over space and the empirical method uses RF power propagation database. The proposed method uses the probability distribution of the power propagation and the maximum likelihood estimation (MLE) algorithm based on power strength DB. Test results show that the proposed method can provide reasonably accurate position information.

Feasibility study of wireless motion control (Wireless 모션제어의 가능성 연구)

  • Lee, Don-Jin;Ahn, Jung-Hwan
    • Proceedings of the KSME Conference
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    • pp.82-86
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    • 2001
  • This papers deals with feasibility study of wireless motion control. Wireless telecommunication advances with development of IT technology and extends more and more areas. So we selected Bluetooth out of the technologies(Bluetooth, SWAP(SharedWireless Access Protocol), IrDA(Infra Red Data Association), WLAN(Wireless Local Area Network)) which was developed for local data communication and set up simple experimental system for wireless data transfer and server and client program for wireless data transfer was wrote. We successfully transferred some data wirelessly with this program.

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A Study of UMTS-WLAN Interworking Architecture for Guaranteeing QoS (QoS 보장을 위한 UMTS와 WLAN의 인터워킹 구조)

  • Kim, Hyo-Jin;Yu, Su-Jung;Lee, Jung-Kap;Song, Joo-Seok
    • The KIPS Transactions:PartC
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    • v.13C no.5
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    • pp.607-612
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    • 2006
  • Universal Mobile Telecommunications System (UMTS) and Wireless Local Area Network (WLAN) have been developed independently. Then, many researchers have studied UMTS-WLAN interworking architecture for the efficiency. However, the transmission capacity difference of two networks causes the transmission quality degradation. Therefore, this paper proposes a UMTS-WLAN interworking architecture for Quality of Service (QoS). The proposed architecture is based on tight coupling and dynamically guarantees QoS by the mobility prediction method. The proposed architecture is simulated by ns-2. Performance experimental results show that the proposed architecture reduces the handover dropping probability comparing with the existing method and enhances the amount of receiving packets comparing with the method without guaranteeing QoS.

Efficient security mechanism in 3GPP-WLAN interworking (3GPP-WLAN interworking에서의 효율적인 보안 메커니즘)

  • 신상욱
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.14 no.3
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    • pp.137-144
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    • 2004
  • 3GPP(3rd Generation Project Partnership)-WLAN(Wireless Local Area Network) interworking refers to the utilization of resources and access to services within the 3GPP system by the WLAN UE(User Equipment) and user respectively. The intent of 3GPP-WLAN Interworking is to extend 3GPP services and functionality to the WALN access environment. We propose an efficient mechanism for the setup of UE-initiated tunnels in 3GPP-WLAN interworking. The proposed mechanism is based on a secret key which is pre-distributed in the process of authentication and key agreement between UE and 3GPP AAA(Authentication, Authorization Accounting) server. Therefore it can avoid modular exponentiation and public key signature which need a large amount of computation in UE. Also the proposed scheme provides mutual authentication and session key establishment between UE and PDGW(Packet Data Gateway).

Security Design of Information Security for Wireless Local Area Network (무선 네트워크망의 정보보호를 위한 시스템 설계)

  • Kim, Jung-Tae;Jung, Sung-Min
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.729-732
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    • 2003
  • Security and privacy issues complicate wireless local area network deployment. for a wired network, certain levels of security are maintained since access to the physical medium is restricted to the devices physically connected to the network. Though wireless local area networks offer some built-in security features, security breaches are possible if appropriate precautions are not taken. This paper describes security issues related to wireless local area networks and presents a software approach for restricting and controlling wireless access. The system authenticates users on the basis of identity, privileges and access hardware by distributed software agents that implement security policy and restrict unauthorized access.

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Real-Time Frequency Interference Analysis System for Performance Degradation Analysis of MIMO-OFDM WLAN Due to WPAN Interferer (WPAN 간섭원에 의한 MIMO-OFDM WLAN의 성능 열화 분석을 위한 실시간 주파수 간섭 분석 시스템)

  • Yoon, Hyungoo;Park, Jin-Soo;Jang, Byung-Jun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.1
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    • pp.88-91
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    • 2016
  • In this paper, we have proposed the frequency interference analysis system using both LabVIEW and Universal Software Radio Peripheral(USRP) for performance degradation analysis of Multi Input Multi Output-Orthogonal Frequency Division Multiplexing(MIMO-OFDM) Wireless Local Area Network(WLAN) due to Wireless Local Area Network(WPAN) interferer. The proposed system consists of three part, i.e., victim, channel, and interferer. Both victim and interferer are implemented by LaBVIEW and a USRP board. Then interfering signal and additive white Gaussian noise are combined with the wanted signals of a victim. Measured Bit Error Rate(BER) at the victim receiver is compared with theoretical BER according to various signal to interference plus noise power ratio (SINR) values. Measured and theoretical BER curves show good agreement.