This year's CES we can hear a good news: the Wi-Fi market is about to recover... A new version of the Wireless Local Area Network (WLAN) standard that focuses on supporting greater client density should begin to grow in the market in 2017 – IEEE 802.11ax; expected to open at the 2017 International Consumer Electronics Show (CES), We will hear the chip information that supports the 802.11ax standard, and perhaps a few access point devices that support the standard. The most advanced WLAN routers are 802.11ac Wave-2, multi-user (MU) MIMO and 4x4 antenna arrays, enabling spatial re-use to minimize multiple simultaneous users. Channel sharing; marketing of such systems is usually based on peak data transfer rates to clients, but the most important advantages are increased network capacity and improved user experience in crowded networks. The success of Wi-Fi leads to channel congestion. It is necessary to consider how to allocate bandwidth to all client devices fairly while responding to the increase in the number of users and data transmission requirements. 802.11ax will be able to cope with increasing congestion problems and provide more Good bandwidth management. Although the 802.11ax standard may not be officially adopted until 2019, it is expected to see early chips supporting the standard in 2017. The new standard extends MU-MIMO in the 2.4 GHz and 5 GHz bands to an 8x8 antenna array, so it is expected to increase network capacity to four times that of 802.11ac, which limits MU-MIMO to the 5 GHz band; With better antenna configuration and other signaling technology improvements, the .11ax standard will also outperform the .11ac, especially outdoors. The 802.11ax specification will also support a more complete bandwidth allocation; Wi-Fi uses a listen-before-transmit mechanism to avoid conflicts in wired Ethernet source communication protocols, while the .11ax standard draws on more current Honeycomb LTE technology. Specifically, the newly added orthogonal frequency division multiple access (OFDMA) communication protocol can bring scheduled resource allocation to Wi-Fi; in this mode, each access point plays a more role. Like a small cellular base station, the allocation of control channel bands is basically to divide the channel into smaller bands for each user. .11ax's OFDMA communication protocol supports downlink and uplink channel management, which is particularly useful in effectively supporting the different needs of different devices; for example, bandwidth can be appropriately allocated to devices that are playing 4K streaming video, or Send short bursts in real time to support IoT applications. Although OFDMA will help improve channel efficiency and quality of service, the technology requires both signal transmission and reception to support it, so the benefits need to increase with the penetration of client devices supporting OFDMA over time. Will appear. At the same time, 8x8 MU MIMO antennas will be the main method to improve network capacity management. This array will also benefit the 11ac Wave-2 and other old devices, allowing users to enjoy the benefits of the new standard network. The new standard also allows client devices to schedule wake-up times for communication, which reduces power consumption and reduces competition by allowing the client to maintain longer sleep periods in the wireless circuit; the standard supports 1024 QAM encoding and long OFDM. Long OFDM symbol to achieve a larger channel width. In addition, the management of multiple access points has been improved. Another advantage of 802.11ax is that it can work with other Wi-Fi standards such as 802.11ad (WiGig); the 60 GHz .11ad standard provides the largest indoor connection bandwidth, such as support for wireless HDMI playback 4K video, VR headset Online, as well as the wireless link dock (docking staTIons). The 802.11ax standard will bring immediate advantages to crowded businesses, hotspots, and apartment buildings with families with many client devices. It uses the best Wi-Fi technology and adds technology from LTE, combining the two. Long became the key to developing the best performance .11ax solution. For the consumer market, the challenge of the 802.11ax standard will be to convey the advantages of density rather than the theoretical peak speed; after all, what is important to the consumer is the best user experience, not the specifications of the device. (Reference text: Wi-Fi Expands with .11ax at CES, by Kevin Krewell)
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