• Title, Summary, Keyword: IEEE 802.11s

Search Result 462, Processing Time 0.047 seconds

Fast Neighbor Discovery for IEEE 802.11s based Mobile Mesh Node (IEEE 802.11s 기반 이동형 메쉬 노드를 위한 빠른 이웃노드탐색 기법)

  • Song, Byeong-Gu;Kim, Jong-Deok
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.13 no.9
    • /
    • pp.1873-1882
    • /
    • 2009
  • In the ad-hoc mode of IEEE 802.11 standard, beacon is used for power control and network alarming between each node, and also it is for the synchronization in controlling network as PCF. However beacon is also used to inform the neighbor nodes of itself except for original purpose in the environment of IEEE 802.11s. For this, the existing beacon's transmission mechanism can't perform a function in full. In this paper, we suggest much faster neighbor discovery reducing network congestion caused by beacon through modification of beacon transmission mechanism. And we will show that suggesting algorithm more faster full neighbor discovery than traditional neighbor discovery using for IEEE 802.11 through simulation and test in real ad-hoc network.

Performance Evaluation of EDCA Channel Access Scheme at IEEE 802.11e WLANs (IEEE 802.11e 무선 LAN에서 EDCA 기법의 성능 분석)

  • Jeon, Hyeong-Ik;Jang, Jae-Shin
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • v.9 no.1
    • /
    • pp.528-532
    • /
    • 2005
  • As the current IEEE 802.11 wireless LAN standard provides the unified channel access procedure for each traffic service without considering its own traffic characteristics, it is difficult to get its differentiated service qualities at IEEE 802.11 wireless LAN system. To solve this limit, IEEE 802.11e standard that can provide differentiated service to each traffic is under preparation. In this study, we implemented IEEE 802.11e EDCA channel access scheme with NS-2 simulator, and showed its numerical results in various system environments with using average delay and throughput as performance measures.

  • PDF

Impact of legacy DCF stations on voice service using EDCA scheme in IEEE 802.11 wireless LANs (IEEE 802.11 무선 랜에서 EDCA 방식의 음성 서비스에 대한 기존 DCF 단말의 영향 분석)

  • Hwang, Gyung-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.13 no.5
    • /
    • pp.996-1002
    • /
    • 2009
  • The EDCA scheme in IEEE 802.11 MAC protocols was adopted to support QoS of each traffic. The impact of legacy DCF stations on EDCA voice service is studied using extensive simulations. The maximum number of voice sessions are obtained in cases that IEEE 802.11b and IEEE 802.11a physical layers are used.

IEEE 802.16 MAC protocol for coexistence with IEEE 802.11 in shared Frequency band (공용 주파수 대역에서 IEEE 802.11과의 공존을 위한 IEEE 802.16 MAC 프로토콜)

  • Lee, Seung-Hwan;Rhee, Seunghyong
    • Proceedings of the Korea Information Processing Society Conference
    • /
    • /
    • pp.1230-1232
    • /
    • 2009
  • 본 논문에서는 공용 주파수 대역에서 IEEE 802.11 WLAN과 IEEE 802.16 WMAN과의 효율적인 공존을 위한 MAC 프로토콜을 제안한다. 제안한 프로토콜은 IEEE 802.11 WLAN과 IEEE 802.16 WMAN이 주파수를 공유하며 지리적으로 공존하는 환경을 가정하였다. IEEE 802.16 WMAN의 BS(Base station)와 SS(Subscriber station)의 통신에서 DL(Down Link)구간에서는 SS가 자신의 DL-burst에서 IEEE 802.11의 CTS를 보내 주변의 IEEE 802.11 디바이스들의 통신을 지연시킴으로써 IEEE 802.11 WLAN 및 IEEE 802.16 WMAN이 공존하면서도 충돌을 방지해 전송 효율을 높일 수 있다. 본 논문에서 제안하는 MAC 프로토콜의 동작에 대해 설명하고 시뮬레이션을 통해 기존 방법보다 향상된 성능을 유지함을 보인다.

  • PDF

A Survey on Admission Control Mechanisms for providing QoS in the IEEE 802.11 Wireless LANs (IEEE 802.11 무선랜에서 QoS 제공을 위한 허가 제어 연구)

  • Lee, Kye-Sang
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • v.9 no.2
    • /
    • pp.535-538
    • /
    • 2005
  • Wireless LANs based on the IEEE 802.11 standard are widely spread for use nowadays. Traffic which are conveyed over the WLANs change rapidly from normal data such a Email and Web pages, to multimedia data of high resolution video and voice. To meet QoS (Quality of Service) required by these multimedia traffic, the IEEE 802 committee recently has developed a new standard, IEEE 802.11e. IEEe 802.11.e contains two MAC mechanisms for providing QoS: EDCA(Enhanced Distributed Channel Access) and HCCA (HCF Controlled Channel Access). Using these standardized MAC mechanisms as a building platform, various admission control mechanisms can be combined to offer QoS gurantees for multimedia traffic. This paper surveys these research efforts.

  • PDF

QoS Support to Design for IEEE802.11e based in Wireless Mesh Networks (IEEE802.11e를 기반으로 한 Wireless Mesh Networks에서 QoS 향상 방법 설계)

  • Seo, Hyung-Yoon;Kim, Dong-Hyun;Kim, Jong-Deok
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • /
    • pp.702-704
    • /
    • 2010
  • Wireless LAN(Local Area Network) environment to support QoS in IEEE802.11 Working Group has standardized on the IEEE 802.11e. IEEE 802.11e EDCA channel access of the high priority traffic as by raising the probability of a chance to support QoS. This is a high priority traffic than low priority traffic, channel access is not necessarily the first. Therefore, as all traffic channels, if you have the same routing path, lower priority traffic on the performance of high priority traffic, sustainable impact. As a result, EDCA, such as voice or video to guarantee QoS for multimedia applications, follow the crowd. In this paper, to solve these problems by using Multi-Interface Multi-Path Routing Algorithm is proposed. Interface for each use in IEEE 802.11e EDCA Access Category much differently by each of the Routing Path for high priority traffic and guarantee QoS.

  • PDF

A Study on Backoff Algorithm for QoS in IEEE 802.11 Wireless LAN (IEEE 802.11 Wireless LAN에서의 QoS 지원을 위한 Backoff Algorithm에 관한 연구)

  • 조재용;김석호;류동관;곽경섭
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.40 no.12
    • /
    • pp.116-124
    • /
    • 2003
  • According to the convenience and efficiency, IEEE 802.11 WLAN(Wireless LAN) has became rapidly wide-spread on the market. However, QoS support is needed for various multimedia service. In this paper, we consider both MAC method of IEEE 802.11 and IEEE 802.11e and Traffic Category differentiated service by QoS support method. In addition, we study currently existing back-off algorithms in view of comparative analysis. As a result we propose a new back-off algorithm called Collision Rate Based-EDCF. The proposed back-off algorithm confirms the performance by computer simulations in terms of Throughput, and QoS support.

Recent Trends to Next-Generation Wireless LANs (차세대 무선랜 최신 기술동향)

  • Cheong, M.;Lee, S.K.;Bang, S.C.
    • Electronics and Telecommunications Trends
    • /
    • v.27 no.2
    • /
    • pp.1-10
    • /
    • 2012
  • 최근 와이파이를 채용한 스마트폰에 대한 수요가 폭발적으로 증가함에 따라 무선랜에 기반한 새로운 신규 기술들이 활발히 연구되고 있다. Gbps 이상의 전송을 가능하게 하는 IEEE 802.11ac는 차세대 스마트폰을 위한 핵심 기술로서 기존의 IEEE 802.11n에서는 수용할 수 없었던 초고화질의 비디오 전송을 가능하게 한다. 또한 최근에는 무선랜을 사용하여 최대 수 km까지 광역으로 서비스를 지원하기 위한 광역 무선랜이 IEEE 802.11af 및 802.11ah에서 연구되고 있으며, 초기 링크 셋업 시간을 획기적으로 절감하기 위한 IEEE 802.11ai 기술도 활발히 논의되고 있다. 본고에서는 이러한 IEEE 802.11ac, IEEE 802.11af, IEEE 802.11ah, IEEE 802.11ai 무선랜 기술에 대한 표준화 추진 현황 및 주요 이슈들에 대해 기술하고자 한다.

  • PDF

Analysis on the Performance Unfairness Problem of the Heterogeneous Environment with IEEE 802.11b and 802.11e (IEEE 802.11e와 802.11b 표준이 혼재하는 이종환경에서의 불공평 문제 성능 분석)

  • Lim Yujin
    • The KIPS Transactions:PartC
    • /
    • v.12C no.2
    • /
    • pp.217-222
    • /
    • 2005
  • The IEEE 802.11 based wireless local area networks are candidates to lead the broadband connectivity in the home and office scenarios. Recently IEEE proposed the 802.11e as a new standard to provide appropriate Quality of Services to a plethora of emerging real-time multimedia and high demanding applications such as high definition movie and audio distribution, video-conference and voice over IP. This paper studies the IEEE 802.11e/IEEE 802.11b interactions focusing on potential unfairness problems that might appear in networks with heterogeneous wireless LAN technologies as well as in the IEEE 802.11e deployment phase.

Coexistence Mechanism between IEEE 802.15.4 and IEEE 802.11 : ACROS (IEEE 802.15.4 와 IEEE 802.11의 공존 방법 : ACROS)

  • Shin, S.Y.;Lee, J.W.;Kwon, W.H.;Shin, Y.H.;Kim, Y.H.;Kim, J.J.;Kim, Yu-Shin
    • 한국정보통신설비학회:학술대회논문집
    • /
    • /
    • pp.74-84
    • /
    • 2005
  • In this paper, a new coexistence mechanism between IEEE 802.15.4 and IEEE 802.11, ACROS (Active Channel Reservation for coexistence), is proposed. The key idea of ACROS is to reserve the channel for IEEE 802.15.4 transmission. During the reservation, IEEE 802.11 transmissions cannot be occurred. Request-to-send/clear-to-send mechanism of IEEE 802.11 is used to reserve channel. The proposed ACROS mechanism is implemented into PC based prototype. By the experiments, the $e{\pm}ciency$ of ACROS is proved.

  • PDF