Wi Fi 6 The Next Generation of Wireless

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Introduction, Another new amendment to the Wi Fi standard Every new generation of Wi Fi brings an opportunity. to pause and consider the transformational changes that will be affecting us in the coming years. Today Wi Fi networks already experience bandwidth intensive media content and multiple Wi Fi. devices per user Moving forward networks will face a continued dramatic increase in the number of. devices a tripling of the total global IP traffic and a diverse range of new technologies that will all. heavily rely on Wi Fi, Figure 1 Cisco Visual Networking Index Forecast and Trends 2017 2022 Whitepaper. As with previous generations Wi Fi 6 also known as 802 11ax will improve high density performance. and provide faster throughput In addition this new generation of Wi Fi will augment customary. speed and density improvements with new capabilities designed for technology trends of the future. IoT connections will represent more than half of all global connected devices by 2022 Virtual and. augmented reality network traffic is poised to grow twelve fold by 2022 Wi Fi networks of the. future need to be nimble and efficient to accommodate increased client density high throughput. requirements and a diversity of new applications, Wi Fi 6 offers several new improvements to make it the highest performing set of wireless protocols. ever developed Not only will Wi Fi 6 boost overall performance but it is designed to perform. efficiently in real world scenarios New features such as OFDMA uplink MU MIMO TWT BSS. color and new modulation schemes all work together to allow end users to experience always on. connectivity without bottlenecks or performance degradation. 2 Cisco Systems Inc meraki cisco com,Evolution of Wi Fi. Since 1999 Wi Fi has evolved rapidly to provide significantly higher throughput and performance. In 2013 802 11n handed the baton to 802 11ac by providing users with higher speed and higher. reliability while conserving power for mobile devices Over the last several years 802 11ac Wave. 2 has improved maximum data rates beyond 1 Gbps While 802 11ac Wave 1 and Wave 2 provided. significantly increased throughput over older standards the ability to get reliable multigigabit. performance and spectral efficiency was still missing from the 802 11 Wi Fi standard and required an. additional amendment, The development of the 802 11ax amendment started in 2013 as a group of technical experts came.
together to discuss the challenges that Wi Fi might face in coming years Wi Fi was contending with. being a victim of its own success as its use became ubiquitous Experts noted the projected increase. of Wi Fi devices such as mobile phones consumer electronics and IoT devices With more devices. Wi Fi would face increasing interference and decreased performance The group saw a need to. get legacy devices IoT devices and high throughput devices to all work together efficiently The. task group discussed problem statements and solutions ultimately outlining the requirements for. Wi Fi 6 also known as High Efficiency WLAN This new generation of Wi Fi will be intelligent enough. to enable the dense and pervasive wireless environments of the future. 3 Cisco Systems Inc meraki cisco com,The Next Generation Wireless Landscape. Looking forward several trends are changing wireless networks as we know them today Wireless. faces an increasing use of high throughput applications increased density of wireless devices and a. change in the needs of networks,Higher Throughput Requirements. The total amount of internet traffic from 2017 2022 will be higher than in the previous 32 years of the. internet Wi Fi will be the transport mechanism for more than half of that traffic In addition to existing. bandwidth challenges an influx of new Wi Fi 6 mobile devices is expected to hit networks in late 2019. and 2020 The data traffic per smartphone is expected to increase by ten times from 2016 to 2022. Adding to Wi Fi data rate requirements 5G networks will be offloading significant amounts of traffic. to Wi Fi These developments will cause challenges for Wi Fi networks which are already dealing. with a steady influx of increasing clients higher client density and high throughput applications. Bandwidth intensive 4K video is expected to grow from three percent of all IP traffic in 2017 to twenty. two percent in 2022 4K video already challenges networks with 15 to 18 Mbps throughput but 8K. streaming video is coming online as well consuming roughly 1 Gbps of throughput Augmented. and virtual reality applications will have increasing use and consume anywhere from 600 Mbps to 1. Gbps of traffic These new bandwidth challenges will require worldwide Wi Fi connection speeds to. increase 2 2x between 2017 and 2022, Figure 2 Projected average global Wi Fi network connection speeds compared to 2017. 4 Cisco Systems Inc meraki cisco com,Higher Density Networks. The next several years will see a 50 increase in networked devices per person resulting in an. average of 3 6 connected devices per person As device counts increase users are also expecting a. more rich and seamless wireless experience However laptops wearables and mobile phones will. cause significant interference and degraded performance for the rest of the network In addition to. the steady stream of increased clients network admins will have to account for dynamic changes as. mobile users physically move locations more often As multiple mobile clients move through spaces. that have overlapping coverage from wireless stations STA traditional collision avoidance protocols. begin to decrease in efficiency This effect is particularly pronounced at higher data rates and. modulation schemes that are more susceptible to noise. Figure 3 Example of a high density network,Changing Network Needs.
With four times as many Wi Fi connected devices as humans on the planet the world s population is. more connected than ever before The days of workers tethered to work stations around centralized. company data centers are on the decline The previous five Wi Fi generations assisted this. untethering transition and the next generation looks to push the bounds of mobility even further Wi. Fi 6 will lay the groundwork for the growing use of applications like collaborative HD video streaming. augmented reality on the manufacturing floor virtual reality entertainment and IoT Internet of things. devices will represent more than half of all global connected devices and connections by 2022 and. 80 of new IoT projects will be wireless IoT devices are provided benefits with Wi Fi 6 potentially. allowing three times better power efficiency and additional spectral efficiency This will lower the. barrier of development for warehouse robots wireless dependent asset tracking sophisticated. sensors and more,5 Cisco Systems Inc meraki cisco com. Wi Fi 6 Capabilities and Benefits, Despite the challenges in the changing wireless landscape users expect wireless deployments to. be pervasive and to support high capacity and a high density of clients Wi Fi 6 is designed to meet. these changing needs performance that will exceed 802 11ac Wave 2 by over 3 4 times support for. higher density with more efficient airtime support for a higher scale of client devices and significant. battery saving While Wi Fi 6 will be able to deliver theoretical data rate growth of around 37 its. largest benefit is the ability to deliver high efficiency performance in real world environments As the. number of clients increase Wi Fi 6 will be able to sustain far more consistent data throughput than. previous 802 11n and 802 11ac amendments There are controlled environments with a very small. amount of clients where previous generations of Wi Fi may provide higher throughput This is due to. the longer frames and wider guard intervals of 802 11ax which help provide resiliency. In addition to consistent real world data throughput Wi Fi 6 comes with the additional benefits of. wider coverage ranges better reliability better IoT operation and more. Figure 4 Data throughput with increasing users for 802 11ax compared to. 802 11ac and 802 11n based on Cisco sponsored research. Several new technologies such as OFDMA help contribute to the new benefits for next generation. wireless networks Borrowed from LTE technology OFDMA helps to significantly reduce overhead. and latency IoT devices will enjoy improved efficiencies since the 2 4 GHz spectrum has been added. to 802 11ax along with power saving features like Target Wake Time TWT. 6 Cisco Systems Inc meraki cisco com,Wi Fi 6 Benefits. Consistent data throughput in dense Additional frequency spectrum for IoT and other. environments devices, Wider coverage range Power savings for wireless devices. Increased reliability and reduced Improved outdoor performance. disconnections,CAPABILITIES WI FI 5 802 11AC WI FI 6 802 11AX.
Standard Description Very high throughput High throughput high efficiency. Operates in Spectrum 5 GHz only 2 4 5 GHz,OFDMA N A DL UL MU OFDMA. MU MIMO Downlink only Downlink uplink, Channel Width 20 40 80 80 80 160 MHz 20 40 80 80 80 160 MHz. Guard Interval 800 400 ns 800 1600 3200 ns, Frequency Modulation 256 QAM with MCS 1 to 9 1024 QAM with MCS 1 to 11. Power Save STBC U APSD STBC U APSD Target Wake Time TWT. Spectral Efficiency N A BSS coloring, Table 1 802 11ax and 802 11ac capability comparisons. 7 Cisco Systems Inc meraki cisco com,OPERATION IN BOTH 2 4 AND 5 GHZ SPECTRUM.
While 802 11n enhanced operation with both the 2 4 GHz and 5 GHz bands 802 11ac only focused. on 5 GHz 802 11ax adds additional spatial streams by supporting both the 2 4 and 5 GHz bands. In addition 802 11ax operates in 20 40 and 80 MHz similar to 802 11ac Since 160 MHz is not. recommended for enterprise deployments it is not covered in this white paper The added 2 4 GHz. spectrum provides several benefits for longer range outdoor use cases and improved coverage for. IoT devices While the spectrum is noisy and congested the better propagation abilities of 2 4 GHz. combined with efficiency improvements of 802 11ax should help maximize the potential of the. 2 4 GHz band,802 11b 802 11a,802 11g 802 11n,2 4 GHz 5 GHz. 802 11n 802 11ac,802 11ax 802 11ax, Figure 5 802 11ax operates in both the 2 4 and 5 GHz spectrum. 8 Cisco Systems Inc meraki cisco com,OFDM TO OFDMA. One of the biggest benefits of 802 11ax is the transition from Orthogonal Frequency Division. Multiplexing OFDM towards Orthogonal Frequency Division Multiple Access OFDMA With 802 11n. and 802 11ac OFDM offers the ability to divide bandwidth into multiple frequency subchannels With. 802 11ax OFDMA enhances the network efficiency by multiplexing users in frequency and space. minimizing contention for wireless medium The increasing amount of connected devices such as. IoT devices can place a strain on APs when trying to connect along with a host of other devices In. previous generations of Wi Fi a small transmission from a single client would be able to monopolize. an entire channel OFDMA allows more efficient transmission of data to multiple devices allowing for. a 20 MHz channel to be split into small resource units RUs or sub channels An 802 11ax AP can use. the entire 20 MHz channel to send data to a single client or split the channel to send data to 9 clients. using 9 RUs Additionally the data can also be modulated using MCS10 or 11 to increase throughput. This is predicted to have transformational effects on Wi Fi efficiency as well as chipset design for IoT. devices New chipsets can be designed more elegantly as they no longer have to operate on 40 MHz. or 80 MHz channels,20 MHz 20 MHz, Figure 6 Nine resource units RUs in a single 20 MHz channel. Even with 802 11ac Wave 2 networks customers that deploy high density wireless deployments with. 5 GHz do not need to configure 80 MHz channels but instead can choose the narrower 40 MHz or. standardize on 20 MHz in order to focus on capacity and reuse of channels With 802 11ax customers. get the ability to divide the channel width even smaller slots such as 2 MHz to tackle transmission to. multiple IoT devices, Since most traffic consists of downloads from AP to clients downlink OFDMA is of particular.
interest for most deployments It allows more efficient aggregation of data to multiple stations These. capabilities will be beneficial to allow a diversity of applications and devices with different needs. to work efficiently together Someone who is posting on Twitter can now simultaneously send data. within a channel that is also sending high definition video. 9 Cisco Systems Inc meraki cisco com,MULTI USER MIMO. MU MIMO is technology that allows an AP to service multiple clients simultaneously across a. supported number of wireless streams or channels While this capability existed in 802 11ac multi user. MIMO will now add communication in the upstream direction With 8x8 support which was added. during the 802 11n amendment new APs can now support four simultaneous 2x2 MU MIMO clients. in both the upstream and downstream directions MU MIMO will work together with OFDMA to allow. multiple clients to communicate simultaneously across multiple frequency ranges as well as multiple. spatial streams,FROM 4X4 TO 8X8, Most enterprise 802 11ac access points offer four transmit and four receive chains offered within an. access point designated as 4x4 While 802 11n and 802 11ac theoretically supported the ability to. requirements and a diversity of new applications Wi Fi 6 offers several new improvements to make it the highest performing set of wireless protocols ever developed Not only will Wi Fi 6 boost overall performance but it is designed to perform efficiently in real world scenarios New features such as OFDMA uplink MU MIMO TWT BSS

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