• Title/Summary/Keyword: 802.11ax

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Spatial Reuse in IEEE 802.11ax: Whether and How to Use in Practice

  • Zhu, Deqing;Luan, Shenji
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.15 no.12
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    • pp.4617-4632
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    • 2021
  • IEEE 802.11ax is a protocol being developed for high-density Wireless Local Area Networks (WLAN). Several algorithms have been proposed to improve the level of spatial reuse applied in IEEE 802.11ax. However, these algorithms are tentative and do not specify how to select the transmit power and carrier sense threshold in practice; It is unclear when and why the tuned parameters lead to better network performance. In this paper, we restricted the scale of transmit power tuning to prevent the case of backfire in which spatial reuse will result in transmission failure. If the restrictions cannot be satisfied, spatial reuse will be abandoned. This is why we named the proposed scheme as Arbitration based Spatial Reuse (ASR). We quantified the network performance after spatial reuse, and formulate a corresponding maximum problem whose solution is the optimal carrier sense threshold and transmit power. We verified our theoretical analysis by simulation and compared it with previous studies, and the results show that ASR improves the throughput up to 8.6% compared with 802.11ax. ASR can avoid failure of spatial reuse, while the spatial reuse failure rate of existing schemes can up to 36%. To use the ASR scheme in practice, we investigate the relation between the optimal carrier sense threshold and transmit power. Based on the relations got from ASR, the proposed Relation based Spatial Reuse (RSR) scheme can get a satisfactory performance by using only the interference perceived and the previously found relations.

IEEE 802.11ax 차세대 무선랜 표준화 동향

  • Son, Ju-Hyeong;An, U-Jin;Go, Geon-Jung;Gwak, Jin-Sam
    • Information and Communications Magazine
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    • v.33 no.10
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    • pp.3-9
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    • 2016
  • AP와 단말이 혼재된 무선랜 환경에서 사용자가 실질적으로 성능 향상을 체감할 수 있는 고효율의 무선랜 표준 개발을 목표로 14년 5월 IEEE 802.11 HEW (High Efficiency WLAN) Task Group이 결성되어 본격적인 표준화 논의가 진행되고 있다. 기존의 무선랜 표준들이 최대전송률 향상에만 초점을 맞췄던 것에 비해, 11ax 표준은 고밀도 중첩 무선랜 환경에서 사용자별 실질적 체감 성능 향상을 목표로 하고 있다. 본 고에서는 6세대 무선랜 표준이 될 IEEE 802.11ax HEW 표준의 표준화 동향 및 주요 요소 기술들에 대해 살펴본다.

WLAN 기술의 발전 방향 및 IEEE 802.11ax 표준화 동향

  • Jeong, Byeong-Hun;Jang, Sang-Hyeon;Yun, Seong-Rok;Kim, Dae-Hyeon
    • Information and Communications Magazine
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    • v.32 no.3
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    • pp.69-76
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    • 2015
  • 무선랜(Wireless LAN)으로도 불리는 Wi-Fi 기술은 1997년 IEEE 802.11 전송 규격(Legacy Standard)이 출간된 이후 지속적인 보완과 개정 작업을 통해 그 규격이 발전되어 가며 스마트폰, Tablet, Note-PC 등 개인 휴대 단말 기기를 위한 데이터 네트워크의 필수적인 구성 요소가 되었다. IEEE 표준과 별도로 표준 인증기관인 Wi-Fi Alliance를 통하여 제품 간 무선연결 호환성의 확보 뿐 아니라 Wi-Fi 기반 서비스 규격 제정에 이르기까지 Wi-Fi 표준 작업이 수행되고 있다. 본고에서는 나날이 발전해 온 Wi-Fi 기술 표준을 전송 속도 향상 측면과 주파수 대역 확장 측면에서 살펴보고, 차세대 Wi-Fi 기술인 IEEE 802.11ax, 즉 HEW(High Efficiency WLAN) 표준에 대하여 살펴보도록 한다.

An Efficient Multi-User Resource Allocation Scheme for Future IEEE 802.11 LRLP Communications (미래 IEEE 802.11 LRLP 통신을 위한 효율적인 다중 사용자 자원할당 기법)

  • Ahn, Woojin;Kim, Ronny Yongho
    • Journal of Advanced Navigation Technology
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    • v.20 no.3
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    • pp.232-237
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    • 2016
  • As a possible standardization of wireless local area network (WLAN), IEEE 802.11 LRLP is under discussion in order to support long range and low power (LRLP) communication for internet of things (IoT) including drones and many other IoT devices. In this paper, an efficient adaptive resource unit allocation scheme for uplink multiuser transmission in IEEE 802.11 LRLP networks is proposed. In the proposed scheme, which adopts OFDMA random access based transmission scheme of IEEE 802.11ax, in order to enhance the efficiency of the slotted OFDMA random access, access point (AP) traces the history of the sizes of successfully transmitted uplink data, and adjusts the sizes of resource units for the next uplink multiuser transmission adaptively. Our simulation results corroborate that the proposed scheme significantly improves the system throughput.

Analysis of Trends in the IEEE 802.11 Family Amendments (IEEE 802.11 개정 트랜드 분석)

  • Kang, Young-myoung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.24 no.11
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    • pp.1554-1557
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    • 2020
  • Looking at the direction of the recent amendments of 802.11 family, there are two major trends. One is to enable the wireless transceivers to support the extremely high-speed wireless transmissions, which has been the mainstream so far. Another big trend is providing a high-performance wireless application platform that meets the demands of the market. This paper summarizes the brand-new IEEE 802.11 amendments from 11ax to 11bf under development by analyzing the innovative features and use cases on them. We provide the vision and direction for the research on the revolutionary data-hungry Wi-Fi 6 and the IEEE 802.11be, alias Wi-Fi 7.

Analysis of IoT Security in Wi-Fi 6 (Wi-Fi 6 환경에서의 IoT 보안 분석)

  • Kim, HyunHo;Song, JongGun
    • Journal of the Institute of Convergence Signal Processing
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    • v.22 no.1
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    • pp.38-44
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    • 2021
  • Wi-Fi provides some low-power connection solutions that other Bluetooth cannot provide, and at the same time brings many benefits. First, there is a potentially higher data rate: it can reach 230mbps. Wi-Fi coverage is also wider than competitors, and its operating frequency is also 5GHz, which is much less congested than 2.4GHz. Finally, it also supports IP networks, which is important if you want to send data to the cloud without complexity. The 802.11ac standard of the previous generation still accounts for most shipments (80.9%) and revenue (76.2%). However, there is a limit to accepting IoT devices that will continue to increase significantly in the future. To solve this problem, the new Wi-Fi 6 standard is expected to be the solution (IEEE 802.11ax) which is quickly becoming the main driving force of the wireless local area network (WLAN) market. According to IDC market research analysts, in the first quarter of 2020, independent access points (APs) supported by Wi-Fi 6 accounted for 11.8% of shipments, but 21.8% of revenue. In this paper, we have compared and analyzed the IoT connectivity, QoS, and security requirements of devices using Wi-Fi 6 network.

IEEE 802.11 ax optimization design study in XR (eXtended Reality) training room

  • Chae, Yeon Keun;Chae, Myungsin
    • International Journal of Advanced Culture Technology
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    • v.10 no.1
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    • pp.253-264
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    • 2022
  • In the era of the pandemic, the importance of a wireless LAN environment has become increasingly important, especially as the era of smart working and non-face-to-face education has become a universal and daily routine. Smartphones, tablets, laptops, PCs, smart watches, and wearable devices, collective referred to as wireless terminals, can be accessed anytime and anywhere through the internet, allowing for consistent and constant access to offices, factories, warehouses, shopping malls, railways, hotels, hospitals, schools, logistics centers, airports, exhibition halls, etc. This sort of access is currently being used in roads, parks, traditional markets, and ports. Since the release of the IEEE 802.11 Legacy Standard in 1997, Wi-Fi technology has been continuously supplemented and revised, and the standard has been continuously developed. In the era of smart working, the importance of efficient wireless deployment and scientific design has become more important. The importance of wireless in the smart factory, in the metaverse era, in the era of pursuing work and life that transcend time and space by using AR, VR, MR, and XR, it is more urgent to solve the shadow area of Wi-Fi. Through this study, we intend to verify the wireless failure problem of the xr training center and suggest improvement measures.

A V2V Transmission Scheme for Safety Message Dissemination in Platooning (군집주행 차량의 안전 메시지 전달을 위한 V2V 전송 기법)

  • Ahn, Woojin;Hong, Hanseul;Kim, Ronny Yongho
    • Journal of Advanced Navigation Technology
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    • v.23 no.6
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    • pp.548-553
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    • 2019
  • Along with advanced vehicle to vehicle (V2V) communication technologies, platooning is regarded as one of the most promising form of autonomous driving solutions in order to increase road capacity. In this paper, we propose a novel V2V transmission scheme for safety message dissemination in platooning. The proposed scheme enhances the efficiency of channel access and multi-vehicle orthogonal frequency division multiple access (OFDMA) transmission by taking advantage of triggered uplink access technique and null data packet feedback report protocol introduced in the sixth generation WLAN standard, IEEE 802.11ax. The simulation results prove that the proposed scheme outperforms the conventional IEEE 802.11 transmission scheme throughout all measured vehicle density range.

WLAN OFDMA Random Access Based Communications for In-Aircraft Wireless Sensor Networks (비행체 무선 센서망을 위한 무선랜 OFDMA 임의접근 기반 통신)

  • Ahn, Woojin;Kim, Ronny Yongho
    • Journal of Advanced Navigation Technology
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    • v.20 no.3
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    • pp.252-257
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    • 2016
  • In this paper a novel access scheme for uplink multiuser transmission based on IEEE 802.11ax random access in in-aircraft wireless sensor networks is proposed. The proposed scheme provides an efficient access control mechanism with three divisions of OFDMA backoff counter (OBO): access, deferring, dropping, which controls the number of potential uplink transmission stations. The proposed scheme can be used efficiently in in-aircraft wireless sensor network where a large number of sensors need to be supported. By using the proposed scheme, since in-aircraft sensors attempt channel access using the proposed differentiated OBO parameters, the number of stations exceeds the access capacity can be efficiently controlled. This paper also provides the mathematical analysis of the proposed scheme, regarding the optimal parameters. According to the performance analysis, the proposed scheme is able to efficiently control the access behavior of wireless sensors in the network.

Distributed UORA Scheme for Autonomous Train Communication in Congested Environment (자율주행 열차의 혼잡 상황 통신을 위한 분산형 UORA 기법)

  • Ahn, Woojin;Kim, Ronny Yongho
    • Journal of Advanced Navigation Technology
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    • v.23 no.6
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    • pp.542-547
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    • 2019
  • Autonomous train is investigated to increase the capacity of railroad, and the reliability of wireless communication plays a critical role in terms of decreasing the inter-train distance. In this paper, we propose a transmission scheme for autonomous train communication in highly congested environment. The proposed scheme, namely distributed uplink orthogonal frequency division multiple access (OFDMA) random access (UORA), applies the triggered uplink access (TUA) and the UORA, introduced in the sixth generation WLAN standard, IEEE 802.11ax, for communication devices on vehicle and platform in a distributed manner. The simulation results show that the proposed scheme efficiently improves the packet transmission success rate in highly congested channel conditions compared to the conventional enhanced distributed channel access (EDCA) transmission scheme.