Time and Frequency Characteristic of 802.11AX (original) (raw)

When Is Multiple Access Beneficial? An Analysis of Multi-User Performance in IEEE 802.11ax

Proceedings of the 20th ACM International Symposium on Mobility Management and Wireless Access on 20th ACM International Symposium on Mobility Management and Wireless Access

IEEE 802.11ax introduces OFDMA (Orthogonal Frequency Division Multiple Access), that allows multiple users to transmit or receive frames concurrently. The standard suggests that OFDMA will provide reduced latency and increased throughput in dense scenarios compared to single-user OFDM. This work uses the latest 802.11ax models supplied by the widely used open-source network simulator NS-3 (version 3.34) to investigate the OFDMA performance under various downlink traffic loads and various application settings for both UDP and TCP traffic. Our simulation results show that the actual benefits of OFDMA over OFDM can only be extracted under intermediate traffic loads for UDP and TCP. We observe that in comparison to OFDM, OFDMA provides more consistent performance in the case of video streaming and video conferencing. Further, it provides lesser latency for web-based applications.

A Tutorial on IEEE 802.11ax High Efficiency WLANs

IEEE Communications Surveys & Tutorials

While celebrating the 21st year since the very first IEEE 802.11 "legacy" 2 Mbit/s wireless Local Area Network standard, the latest Wi-Fi newborn is today reaching the finish line, topping the remarkable speed of 10 Gbit/s. IEEE 802.11ax was launched in May 2014 with the goal of enhancing throughputper-area in high-density scenarios. The first 802.11ax draft versions, namely D1.0 and D2.0, were released at the end of 2016 and 2017. Focusing on a more mature version D3.0, in this tutorial paper, we help the reader to smoothly enter into the several major 802.11ax breakthroughs, including a brand new OFDMAbased random access approach as well as novel spatial frequency reuse techniques. In addition, this tutorial will highlight selected significant improvements (including PHY enhancements, MU-MIMO extensions, power saving advances, and so on) which make this standard a very significant step forward with respect to its predecessor 802.11ac.

Performance analysis of IEEE 802.11ac based WLAN in wireless communication systems

International Journal of Electrical and Computer Engineering (IJECE), 2019

IEEE 802.11ac based wireless local area network (WLAN) is emerging WiFi standard at 5 GHz, it is new gigabit-per-second standard providing premium services. IEEE 802.11ac accomplishes its crude speed increment by pushing on three distinct measurements firstly is more channel holding, expanded from a maximum of 80 MHz up to 160 MHz modes. Secondly, the denser modulation, now using 256-QAM, it has the ability to increase the data rates up to 7 Gbps using an 8×8 multiple input multiple output (MIMO). Finally, it provides high resolution for both narrow and medium bandwidth channels. This work presents a study to improve the performance of IEEE 802.11ac based WLAN system. 1. INTRODUCTION Recently, wireless communications have fundamentally developed because of the trend setting innovation of cell phones, convenient gadgets and the fast development of Internet of Things (IOT) [1], astute transportation frameworks and person to person communication. IEEE 802.11 is a well-known standard that widely used to control the physical layer determinations for executing wireless local area network (WLAN) computer for various frequency bands such as 900 MHz and 2.4, 3.6, 5, and 60 GHz [2]. At 1997 the basics of IEEE 802.11 was discharged and then the results were revised. This system with its corrections are focusing on the items of wireless systems such as Wi-Fi. On the other hand, every modification is revoked when it is established in the last version of the system. The companies resort to market to get the corrections and updates in order to improve the capabilities of products. These revised systems will become new standards. Wireless communications heading towards high bandwidth of data transmission for multi-users at the same time. IEEE 802.11 standards evolution is shown in Figure 1. This paper introduces the history of IEEE 802.11 standard in section 2. While section 3 presents how IEEE 802.11 developped and improved to IEEE 802.11ad.The simulation results with detailed discussions are presented in section 4. Finally, the important conclusions and some suggestions for further improvement of the proposed work are discussed in section 5.

Review Paper on 802.11ax Scheduling and Resource Allocation

2020

Nowadays a fast remote Internet association is a need as opposed to a luxury. IEEE 802.11ax could be a revolution to present an improvement over this age of 802.11. 802.11ax has been accepted to convey next-generation Wireless Local Area Network (WLAN) techniques. 802.11ax using multiple techniques as using modulation 1024 Quadrature Amplitude Modulation (QAM), Orthogonal Frequency Division Multiple Access (OFDMA), robust high efficiency signaling for better operation at a significantly lower Received Signal Strength Indication (RSSI), Target Wakeup Time (TWT) where the station can request to wake up at any time in the future and more. 802.11ax achieves multiple benefits as enabling a more than 35% speed burst, reduce overhead and latency, and more. This paper gives a review of the IEEE 802.11ax resource allocation scheduling in both: 1) Downlink (DL) data transfer 2) Uplink (UL) data transfer. KEYWORD: IEEE 802.11ax, Scheduling, MU-MIMO, Resource allocation, Wi-Fi, OFDMA How to cit...

Resource Management for OFDMA based Next Generation 802.11ax WLANs

2016

Recently, IEEE 802.11ax Task Group has adapted OFDMA as a new technique for enabling multi-user transmission. It has been also decided that the scheduling duration should be same for all the users in a multi-user OFDMA so that the transmission of the users should end at the same time. In order to realize that condition, the users with insufficient data should transmit null data (i.e. padding) to fill the duration. While this scheme offers strong features such as resilience to Overlapping Basic Service Set (OBSS) interference and ease of synchronization, it also poses major side issues of degraded throughput performance and waste of devices' energy. In this work, for OFDMA based 802.11 WLANs we first propose practical algorithm in which the scheduling duration is fixed and does not change from time to time. In the second algorithm the scheduling duration is dynamically determined in a resource allocation framework by taking into account the padding overhead, airtime fairness and ...

An Improved Channel Access Model for IEEE 802.11 WLANs

Journal of Engineering Science and Technology Review, 2013

In this paper, a robust channel access strategy is proposed. The research is motivated by the inefficiency of current IEEE 802.11 WLAN systems. We adopt a dynamic allocation strategy that improves throughput efficiency in high-data-rate WLANs, by splitting the packet transfer of the system to speedup communication. The proposed model grants each node autonomous access to the pool of available resources using orthogonal frequency division multiplexing (OFDM)-a fourth generation wireless technology. The models for the system are derived and simulated with field data for both inbound and outbound traffics. Results obtained from the simulation represents best practices and yields better system performance compared to the existing IEEE 802.11 WLAN systems.

Performance Impact of CSMA/CA on the throughput of IEEE 802.11 Networks

A wireless LAN is a LAN that uses the air as a medium of transmission to permit data transmission among fixed, or moving computers. The MAC layer of 802.11 employs the carrier sense multiple access/collision avoidance (CSMA/CA) to provide reliable frame transmission. This paper presents the impact of CSMA/CA on the performance of IEEE 802.11 networks. We measure the IEEE 802.11 wireless network throughput from a number of hosts to the access point (AP). The paper shows the factors that lead the difference between theoretical and measured throughput

An Overview of WLAN Performance, Some Important Case-Scenarios and Their Associated Models

Wireless Personal Communications, 2014

The study of the 802.11 standard has been very intense for more than a decade now. Several works have striven at understanding its performance, even in the simplest topology of a wireless local area network (WLAN) with a single access point (AP). The present survey is an effort to classify and present the enormous literature on the subject into several important casescenarios, and summarizes the current understanding of WLAN performance. The resulting performance and associated models are discussed (and sometimes extended) and simulation results are used to illustrate them. We also highlight interesting open research problems that we believe the community should address.

IEEE 802.11ac: The Next Generation Wifi Standard

Up to now most users depending on Wi-Fi networks to access e-mail and webpages which does not require more bandwidth. Due to increase in higher bandwidth applications such as high definition video streaming, large file transfer we require larger bandwidth and super speed Wi-Fi links (exceeding 1Gbps). This article describes the some of the important features of IEEE 802.11acwhen compared to previous legacies 802.11a/b/g/n and challenges facing by it. We will study the ability of this standard for the new usage models.