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标题: What is WiFi 6? Everything You Need to Know [打印本页]

作者: irfan_kolkata 时间: 2019-04-11 16:41
标题: What is WiFi 6? Everything You Need to Know
What is WiFi 6?[br][br]As mentioned in the introduction, WiFi 6 is the latest standard of WiFi which is bringing a host of speed, security, and connectivity improvements. The current latest WiFi standard which we are using is the 802.11ac which you might have noticed on your router’s or smartphone’s specifications. The new standard which is going to replace 802.11ac in the near future is called the 802.11ax. However, since this nomenclature is very confusing, the WiFi Alliance has released a simple numbering system for WiFi which will make it easier to understand for consumers. Since the latest version of WiFi standard, the 802.11ax, is the sixth instalment, it is dubbed as the WiFi 6. Here are all the WiFi standards released till now in reverse chronological order:[br][br]802.11ax -] WiFi 6 (scheduled release in 2019)[br]802.11ac -] WiFi 5 (released in 2013)[br]802.11n -] WiFi 4 (released in 2009)[br]802.11g -] WiFi 3 (released in 2003)[br]802.11a -] WiFi 2 (released in 1999)[br]802.11b -] WiFi 1 (released in 1999)[br]Note: WiFi 1, WiFi 2, and WiFi 3 names are not officially recognised. We are just using it as it makes sense.[br][br][br][br] (, 下载次数: 0) [br][br]As you can see, the older names although technically more revealing were not consumer friendly. However, now by just taking one look at the new names, a consumer will be able to understand if he or she is getting the latest standard of WiFi or not. WiFi Alliance has also introduced new WiFi logos which will make it easier for people to see which WiFi standard they are connected to. The symbols are pretty self-explanatory as they show a number embedded in the WiFi icon, as shown in the picture above.[br][br][br]In conclusion, WiFi 6 is the latest WiFi standard which is slated to be released in 2019. Now, that we know what actually WiFi 6 is, let’s take a look at all the improvements that it’s bringing to the table.[br][br]What are the Benefits of WiFi 6 Standard?[br][br]The new WiFi 6 standard is bringing a ton of new enhancements. Not only will the standard enable faster connections, but it will also make them more secure and reliable. Here are all the improvements that you are going to get with it:[br][br]1. Speed Improvements[br][br]WiFi 6 is bringing significant speed improvements. While it’s not as big as the one we saw when we moved from WiFi 4 to WiFi 5, it’s still quite a lot. In the perfect WiFi connectivity situations, users can see a theoretical 40% increase in connectivity speeds. The new standard achieves that by improving data encoding resulting in higher throughput. Basically, WiFi 6 devices will be able to pack more data in the same spectrum space. This is made possible by the new chips which are much more powerful and capable than their previous counterparts.[br][br][br][br] (, 下载次数: 0) [br][br][br][br]That said, speed is just a small part of improvements which are coming with the new WiFi standard and probably the least important one. The main focus of 802.11ax or WiFi 6 is not to make the connectivity faster, instead, it is to make it more efficient. As you will see in the next sections, WiFi 6 will make our lives so much better and more secure.[br][br]2. Spectrum Usage Improvements[br][br]The new WiFi 6 standard will operate in both 2.4 GHz and 5 GHz channels. This means that you will have the advantage of not only having long-range connectivity but also higher data throughput. Some tech companies like Apple and Facebook are also lobbying for releasing the 6 GHz bandwidth for WiFi usage. If that happens, it will release never before used channels resulting in lesser congestion and hence better connectivity.[br][br][br][br] (, 下载次数: 0) [br][br]3. MU-MIMO Improvements[br][br]MU-MIMO or “Multi-user Multiple input, Multiple output” is the technology that allows a WiFi access point to connect to multiple devices at once. Before MIMO was a thing, a WiFi access point would connect to one device at a time while other devices have to wait in line for connection. Since the switch actually happens within microseconds, we users don’t notice the switch, that is, till the number of devices is pretty small and there are no other networks causing interference. As soon as you increase the number of client devices for an access point, you will start seeing things like delayed response (Latency) and drop connections.[br][br][br][br] (, 下载次数: 0) [br][br]This improved with the introduction of MU-MIMO connection with WiFi 5 (802.11ac) as it allows multiple devices to connect to a single access point simultaneously. WiFi 6 improves upon this by increasing the number of devices that can simultaneously connect to a source. The WiFi 5 standard supported 4 devices, that too for only downlink. The new WiFi 6 standard will allow 8 devices to simultaneously connect to an access point and it will work for both downlink and uplink connections.[br][br]OFDMA Improvements[br][br]OFDMA or “Orthogonal Frequency Division Multiple Access” is another technology improvement that will improve efficiency, latency, and throughput. This one is a little hard to explain in simple terms but I will try my best, so stick with me a little bit. Till now, the latest WiFi standard which is the 802.11ac or WiFi 5 uses OFDM technology which uses individual channels to carry data designated for specific client devices. The problem with this approach is that it results in wasted capacity.[br][br][br][br] (, 下载次数: 0) [br][br][br][br]For example, let’s say your smartphone is accessing data from your router. While your router has the capacity to deliver higher data throughput, you might just be browsing Twitter. That means despite you not using your data to optimal capacity, the data transfer is using the entire bandwidth, and that results in loss of capacity. With the new OFDMA technology, the data channel is chopped up so that data from different devices can be bundled together to ensure that no bandwidth is wasted.[br][br][br][br] (, 下载次数: 0) [br][br]Since multiple devices are able to send data at the same time, it not only improves efficiency but also results in lower latency. This together with MU-MIMO enhancement improves the connectivity even if there are 30 devices connecting to the same access point at the same time.[br][br]BSS Coloring[br][br]BSS Coloring is one of the biggest improvements coming with the new WiFi 6 standard. One of the main problems with current WiFi standard is not the throughput rate rather the amount of interference which causes that rate to drop. At any moment, we are surrounded by multiple access points (routers, security cameras, monitors, and more) and client devices transmitting their signals. Since all of them are using more or less the same bandwidth, they interfere with each other leading to a drop in connectivity.[br][br][br][br] (, 下载次数: 0) [br][br]That happens because an access point waits for a data frame to pass before it starts transmitting data, even if that data frame is from another network. Hence, a user will experience latency even when he is using a single client device. What BSS coloring does is that it allows access points to attach an identifier to data frames on its network. Thus, theoretically, it will be able to tell if a data frame is coming from another network and keep on transmitting without stopping the connection. A crude pictorial representation of the same concept is shown in the picture above. While a data frame is passing over our access point (marked red), since it knows that the data frame is not from its network, it keeps on transmitting data (marked blue).[br][br]Do note that, for an access point to use BSS coloring effectively, other network signals have to be below a weakness threshold. That means, if you live in an area where other networks’ signal strength is above that threshold, BSS coloring will not work. That said, it’s still a big improvement as it should work in most situations.[br][br]Target Wake Time (TWT)[br][br]Target Wake Time or “TWT” is an awesome new feature which is great for battery life on our mobile devices. Currently, when multiple devices are connected to the same access point and are waiting for their turn to receive data, they all remain awake which drains battery life (as shown in the picture below). With WiFi 6 standard, the access point will basically be able to tell devices in line the exact time that they will receive the connection so that they can sleep while in line.[br][br][br][br] (, 下载次数: 0) [br][br][br][br]It is kind of like putting appointments on your calendar. Once the appointment is set,your device doesn’t have to anxiously wait for its turn and waste battery life. It can just wake up at the right time and receive data. Theoretically, this should allow a device to use 7x less power on WiFi than they currently do which should result in better battery life.[br][br][br][br] (, 下载次数: 0) [br][br]These are all the major changes that are coming with the new WiFi 6 standard. Now, let’s see when we can hope to enjoy these improvements.[br][br] (, 下载次数: 0) [br][br]When will We See WiFi 6 Certified Devices?[br][br]Since WiFi 6 standard is set to be ratified sometime in 2019, we should see WiFi 6 compatible client devices by the end of 2019 and the start of 2020. That said, depending on the user’s upgrade cycle, it might be at least 3-4 years before the industry shifts to the standard. As far as WiFi 6 capable access points (routers) are concerned, some of the early mover companies including Asus (ASUS RT-AX88U –Rs. 20000) and NetGear (NETGEAR Nighthawk – Rs. 21000) have already launched some products.

作者: sk001 时间: 2019-04-11 16:54
good information dear

作者: Rintu sk 时间: 2019-04-11 17:21
nice information thanks

作者: Thinesh 时间: 2019-04-11 19:41
Good information

作者: sakhr68 时间: 2019-04-14 01:06
Nice info brother

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