So 2022 will be 802.11ax?
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802.11ax is already here and shipping now as we speak. 2019 should be the year it is widely available to consumer.
As far as I can tell, ALL current and upcoming so called 5G implementation around the world are based on NR mmWave. Which requires a line of sight for it to work, and you can guess, pretty much useless in most of your day to day use.
You want 5G in 3.5Ghz and lower end spectrum. And this isn't happening yet, these will likely start as early as 2Q 2019, assuming all the testing are good. So far from most of the report I have read on Real World testing, none of the LAA, MU-MIMO perform as good as advertise, i.e Lots more work and tuning to be done.
A lot telecom ( Actually all the major three, Huawei, Ericsson, Nokia ) equipment manufacture advertise their Hardware as 5G software upgradable. Assuming the contract can not be alter for better / newer alternative, most carrier are already upgrading their cell tower now and all the way through 2019 and 2020. And that is assuming everyone has their Cell tower connected via 10Gbps Fibre ( or more ), which is not true for many countries.
So it does make a lot of sense for Apple to support 5G in 2020. Because unless some miracle happen in the next 6 months, the initial 5G will be ... meh.
( I was expecting a lot from LAA, eLAA, MU-MIMO, NR FD MIMO, etc... but none of it so far perform as good as the Lab test and marketing slides. Much like the industry expert have been saying, 5G is an evolution more than revolution. and it is going to take a few more years to smooth out all the issues )
Edit: And I forgot to mention the crappy Antenna from Apple needs to get re-engineered.