Van Boom 22 ms test 230Verizon shocked many by specifying 30 ms as the latency on its 5G network. Its top officials predicted much faster connections; many, especially politicians, talk of 1 ms. In multiple independent tests, Verizon usually was somewhat better than 30 ms, down to 24 ms In Telstra in Australia, Daniel van Boom and Ian Knighton of CNET found 22 ms in a test. A thoughtful article. A test in Korea returned 25 ms. Several in England were 30-35 ms.

The latency can be brought down by putting special servers inside the carrier system, an Edge Network. Expect 15-25 ms depending on where in the network the servers are deployed. Most will be one to three routers from the cell, perhaps at a C-RAN or exchange. Some will be further back in the network.Verizon is also improving the transport and backhaul on its system, which could be almost as effective as a regional edge network.

1 ms works in the lab, but less than 15-20 ms will be rare on public networks for years. 

For almost all purposes, the meaningful latency is from the phone to the server it's trying to reach. If servers were frequently placed at the cell, that could be 10-15 ms. Few if any carriers are planning that, however. An industrial 5G network can have a server at the 5G cell, bringing latency down to about 10 ms.

URLLC, the next version of 5G, will reduce all the above figures by ~5ms. In-building and similar locations with URLLC should be able to get down to 4-7 ms, mostly after 2023.

DT and Vodafone have started offering Edge, on a system designed by MobiledgeX. Nicki Palmer says Verizon Edge will be commercial by yearend 2019. China will build an incredible network, bringing over one billion people within 25 ms of a server. 

The "air latency" of today's 5G is 8-12 ms. That's meaningful for a network architect but has nothing to do with user experience. The "1 millisecond" was an aspirational goal to promote 5G, not really expect for many years.

dave ask


Rethinking Jan 27: Coronavirus could invalidate all projections. I reported on AIDS for 2 years. This could be worse because it spreads in air. Let us hope and pray.

Details on all 5G phones, as prices drop to $285 ** All actual 5G networks worldwide ** Facebook ordered to repost Italian fascist page. ** Apple China sales down 35%** Qorvo sees 300M 5G 2020 & 750M 2023 mmWave <10%

** Bharti demands India Gov more than double prices and enforce cartel. Sunil Mittal "Situation is dire. It is a matter of survival for everyone." ** Wi-Fi 6 meets ITU 5G criteria @stephenjcrowley ** Samsung $8B for Chinese memory plants ** Morgan paying billions for Altice fiber

Dec 10 Sprint bringing $300-500 5G phones to US 2020. Nokia, Lenovo, HMD ** H., Apple, and AMD doing 5 nm test runs on TSMC's 5 nm. Early results are 15-30% better than 7 nm ** AT&T low-band 5G built to >65% US. Speeds slower than 4G at launch. ** 

Verizon CEO Ronan Dunne: >1/2 VZ 5G "will approximate to a good 4G service" Midband in "low hundreds" Mbps ** CFO John Stephens says AT&T is going to cut capex soon. ** Huawei in 16 days sold 1,000,000 5G Mate 20s.  


Welcome  Asia is installing hundreds of thousands of 5G radios and adding 5G subs by the tens of millions. The west is far behind. 200,000,000 in 2020

The demand is there, and most of the technology works. Meanwhile, the hype is unreal. Time for reporting closer to the truth.

I'm Dave Burstein, Editor. I've been reporting telecom since 1999. I love to hear from readers and say thank you when you find an error.

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