Full Duplex Coming to to Wireless

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Dairyxox

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#168547 17-Mar-2015 21:14

New Radio IC Technology may double the data capacity of wireless devices

This seems to be some real innovation after recent technology advancements have been more brute force (merely increasing the spectrum of frequency used.)
In theory it could double the bandwidth of existing frequency use. The best news in wifi in a long time.

I like the analogy, "like trying to listen to someone whisper while yelling at someone else"

Dairyxox

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#1261936 18-Mar-2015 20:23

Nobody cares?
Maybe have an effect on latency too, since the radio no longer has to take turns to switch between sending, then receiving.

tdgeek

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#1261943 18-Mar-2015 20:30

Great. BUT, I'd wait for Steve Biddles's comment. Wifi is not an unlimited resource, I would doubt that full duplex will be "free", there will be a cost, of perhaps latency, real world speed, somewhere along the line

Dairyxox

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#1261944 18-Mar-2015 20:33

I guess it will cost energy (Watts) for the incorporated logic, and in dealing with more bits. It must also cost $$ as these advances are business for someone.

tdgeek

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#1261947 18-Mar-2015 20:44

My cost comment was opportunity cost, not financial. We went from G to N, to AC, a lot of speed there. If full duplex was that easy, we would have it now?

Dairyxox

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#1261988 18-Mar-2015 21:38

Thats the point though, it wasn't easy.
Those advances were, and they were' brute force'. This one is the real innovation.

jjnz1

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#1261994 18-Mar-2015 21:50

Wow, this could have major benefits in severely populated city areas where frequency (and capacity) is at a premium.

I wouldn't put my house on it until I could see actual products that use this tech though.

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raytaylor

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#1262192 19-Mar-2015 10:22

Full duplex, even if the uplink isnt that fast, will make a huge difference.
It would basically eliminate hidden node issues or collision collapse if they could pair it with TDMA right from version 1 out of the box.

So I would find acceptable if the system used a 20mhz downlink channel to get ~108mbit and a 5mhz uplink to get ~40mbit or even 20mbit in a single chain. That way acknowledgement packets could be returned faster, and the AP can be streaming more data faster without needing to wait as long for acknowledgements.

Over a short distance however, the acknowledgements come back pretty quick so in terms of TCP, it wouldnt make too much difference.

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sbiddle

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#1262201 19-Mar-2015 10:33

jjnz1: Wow, this could have major benefits in severely populated city areas where frequency (and capacity) is at a premium.

I wouldn't put my house on it until I could see actual products that use this tech though.

It's worth remembering this topic is really "full duplex coming to 802.11 WiFi". Full duplex wireless exists, and has done for a long time. Typically it's protocols that are FDD rather than TDD.

eXDee

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#1262346 19-Mar-2015 12:36

sbiddle:
jjnz1: Wow, this could have major benefits in severely populated city areas where frequency (and capacity) is at a premium.

I wouldn't put my house on it until I could see actual products that use this tech though.

It's worth remembering this topic is really "full duplex coming to 802.11 WiFi". Full duplex wireless exists, and has done for a long time. Typically it's protocols that are FDD rather than TDD.

Expanding on this with an example of a brand that some people may commonly know, Ubiquiti Airfiber is an example of a point to point FDD capable full duplex solution.

https://www.ubnt.com/airfiber/airfiber/