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下一代无线通信标准——802.11AX – 译学馆
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下一代无线通信标准——802.11AX

What is 802.11ax Wi-Fi?

谢谢你观看TECH quickie节目
Thanks for watching TECH quickie.
点击订阅按钮
Click the subscribe button,
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then enable notifications with the bell icon,
这样你就不会错过任何视频了
so you won’t miss any future videos.
在最近的几集中
In the recent episode,
我们抱怨过CPU名称方案混乱
we complained about confusing CPU namings schemes.
但你知道吗?
But you know what?
我认为wifi修改名称
I think WiFi revision nomenclature
可能更糟
maybe even worse.
我是说真的
I mean seriously.
它们一般都以802.11为开头
They started out with 802.11
这对于一般人来说没有意义
which to the average person is about is meaningless
就像是一个对于经济改革的政治活动
as a promise about political campaign finance reform.
之后就是以一串随机的字母结尾
And then they stuck a bunch of seemingly random letters on the end
比如“b”“g”“n”“ac Wave 2”这些东西
like ‘b’ ‘g’ ‘n’ ‘ac’ and ‘ac Wave 2’ of all things.
现在 “b”将给我们带来下一代WiFi标准
Now, the powers that ‘b’ are giving us 802.11AX
即是802.11AX
as our next WiFi standard.
所以他们或许会放些甜头
So either they threw in an axe
来吸引年轻一代
to appeal to the younger generation taco bell style
又或许不会推出最终用户产品
or there were in between revisions
只是一直修改
that never made it into an end-user product.
我们无从得知
We’ll never know.
我们知道的是 AX无线
What we do know, it’s that wireless AX
大概率会给你的WiFi初次体验
does look like it’s gonna to bring some exciting improvements
带来一些令人激动的改善
to your WiFi experience starting,
也许就是令人震惊的网速吧
perhaps unsurprisingly with speed.
现在 如果你从理论上看这点
Now, if you look this back on paper,
你会注意到之前的标准无线AC Wave 2的
you might notice that the maximum theoretical speed
单数剧流最大理论速度
for the previous standard wireless AC Wave 2
是866Mb/S
is 866 Mb/S for a single stream,
无线AX只有1201Mb/S
and then only 1201 for wirelss AX.
虽然这更高了
So it’s higher,
但是却没有我们从WIFI N到WIFI AC 的六倍飞跃
but not a nearly 64 increase like when we ran from N to AC.
不过还是可以接受的
But that is actually OK.
你们也许知道
Because as some of you probably know,
WiFi的最大理论速度
the theoretical maximum speeds for WiFi
是众所周知的不准确
are notoriously inaccurate anyway.
而且实际的变化是由
And real world performance can vary wildly depending on
范围 障碍以及空气中其他的信号
range, obstacles other signals in the air
还有你的接收位置和设备质量来决定的
and the quality of your access point and your device.
所以为解决这些
So to address this,
无线AX着力于开发
wireless AX aims to improve
更多的方式
efficiency in a number of ways
让你获得比AC快得多的
to give you consistently higher real world speeds
持续实速
than what you get with AC.
但最大的挑战也许就是一个技术叫OFDMA ofdma
Perhaps the biggest change is a feature called OFDMA, ofdma…
好吧 随便怎么叫吧
Well, however you say it.
它的作用是把无线信道分成
What it does is chop up each wireless channel,
许多个小的子信道
into many smaller partial channels.
这就使得30个不同的设备可以同时
Which allows up to 30 different gadgets
在单个通道中接入访问点
to talk to the access point at once
而不是仅仅一个
over a single channel instead of just one.
即使子信道比主信道小
Even though the sub channels are smaller than the main channel,
但是访问点的灵活度提高了
the access point gets more flexiblity,
使得它可以根据设备各自的数据需求
allowing it allocate band width to each device
来分配频带
based on its data needs.
它们总体上还是提升了效率的
They should increase performance overall.
OFDMA也是多用户mimo串联工作的
OFDMA also works in tandem with multi-user mimo.
你可以在这个视频中了解更多 但也就是
You can learn more about this up here, but the just of it
使得多用户mimo接入一个访问点
is that multi-user mimo allows an access point
同时连接多个设备
to address multiple devices simultaneously
而不是一个一个的连接
instead of one in a time sequentially.
这就是为什么多用户mimo
And why multi-user mimo
在上一代无线网AC
was introduced for consumers with
就被推荐使用
last-gen wireless AC
无线AX则更进一步发展MIMO
Wireless AX improves on it.
从原来的4台同时连接
Not only by allowing
改进到了8台
8 simultaneous streams instead of just four,
还可以
but also by enabling it
同时上传和下载
for both uploads and downloads
所以 在人山人海的地方
So, uploading photos or
比如商场 演唱会现场
streaming video from a crowded area
上传图片或者加载视频
like a trade show or a concert venue,
有了无线AX
with wireless AX support,
这一切就变得轻松多了
should get a fair bit easier.
另一个很酷的特点是添加了颜色
Another cool feature is the addition of color.
当然了 我不是说无线AX将会
And no, I don’t mean that wireless AX will make
让你两百美元的蹩脚频率看上去多姿多彩
the color on your crappy two hundred dollars notebook screen look better.
而是 它提供了BBS颜色技术
Instead, it supports a feature called BSS color,
是一个可识别数据块和
which is an identifier that is attached
数据帧的技术
to each data chunk or frame
以此来判断无线电是从哪里来的
to indicate what wireless network it came from.
如果有空间中还有其他帧的无线电波的话
You see access points typically wait to transmit
访问点通常要等待传输
if there is already another frame flying through the air.
有了BSS颜色
With BSS color,
一个AP就可以识别出其他网络的帧率
an AP can tell which frame are coming from other networks
并且忽略它们
and ignore them,
只要它们在较弱的
as long as they are below a threshold of weakness
干扰范围之内
to prevent interference.
就可以有效避免降速
This should help avoid unnecessary slowdowns.
如果这些改进都还不够的话
And if all these improvements aren’t enough,
无线AX还可以利用
wireless AX can utilize both
2.4和5千兆赫带
two point four and five gigahertz bands
同时技术公司最近还在研发
with tech company currently trying to get even more
把六千兆赫带的光谱加入到WiFi
spectrum of in the six gigahertz range allocated to WiFi.
对于你的供电设备
And for your battery-powered devices,
它还有另一个特点
it supports yet another new feature called
叫目标唤醒时间
Target Wakeup Time
这使得设备之间可以相通
that allows gadgets to negotiate how often
以此来知道他们需要多长时间传输或者接收数据
and for how long they will need to transmit or receive data.
这使得WiFi的信号发射器可以
This allows the WiFi transponder to sleep
在不必要的传输时休眠
when transmission isn’t necessary,
只要AX设备处于工作状态
which should help to preserve precious battery life
就可以节省你的电量
once AX devices are available.
但是什么时候才会实现呢?
But when will that be?
好吧 很高兴你会问我
Ahh, I’m glad you asked.
实际上 第一个设备和以往一样是路由器
Well, the first devices will be routers as usual.
较早的网络供应商
With early bird network vendors,
比如华硕打算在2018年中旬推出
like a Asus planning mid 2018 launches.
所以 因为新的标准也是兼容的
So, since the new standard is backwards compatible,
如果你想的话你可以早点更新
you could make the upgrade early if you wanted to.
至于客户端设备呢
And as for a client devices, well,
流传的说法是手机 笔记本电脑
the word on the street is that phones and laptops
或许在2019年开始
will probably start hitting the consumer market
出现在市场中
sometime in 2019.
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当TunnelBear打开时
With TunnelBear turned on,
你的连接是安全的
your connection is secured
你在网络上的数据对网络提供商或者是
and your data is kept private
广告商或者是想要攻击你的电脑的
from your Internet provider, advertisers
又或是想从你制造的数据来获利的人都是加密的
or anyone of those who looking to track you
只要你使用了这个软件的服务和浏览了它的主页
or profit from the data that you generate
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TunnelBear有一个高端的隐私协议
TunnelBear has a top-rated privacy policy
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链接在下方
We are going to have that linked below,
即是TunnelBear.com/Linus
it’s TunnelBear.com/Linus.
最后还是谢谢你们的观看
So thanks for watching guys.
如果你不喜欢这个视频 你可以这样
If you dislike this video, you can do that or you can like
如果你喜欢就点这个 或者你可以去看看其他的频道
or you can check other channels
或者想想视频点子和订阅
or come in with video suggestions and subscribe.
哇~
Woo~

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译制信息
视频概述

你对于WIFI了解多少呢?来看看吧

听录译者

赵大诗

翻译译者

_ C_

审核员

审核员 W

视频来源

https://www.youtube.com/watch?v=m_qTs_FQ_jU

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