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[tsvwg] Re: 5G+ Ultra (aka L4S)

Ruediger.Geib@telekom.de Mon, 27 April 2026 07:29 UTC

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From: Ruediger.Geib@telekom.de
To: ingemar.s.johansson=40ericsson.com@dmarc.ietf.org
Thread-Topic: 5G+ Ultra (aka L4S)
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Date: Mon, 27 Apr 2026 07:29:41 +0000
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Subject: [tsvwg] Re: 5G+ Ultra (aka L4S)
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Hi Ingemar,

 

thanks…commercial roll out was more than a year ago in Germany (I think, Gamescon 2024). T-Mobile US meanwhile supports L4S by 5G-SA too. Other (mobile network) operators test L4S.  

 

Apart from network operator gear, terminating equipment and applications need to support L4S (AccECN and a transport-protocol making use of it). For the time being that creates a certain similarity of the supported applications by those network operators with commercial L4S deployments (cable and mobile). It’s not yet: turn on L4S on a router and all interactive real-time app delays are gone…

 

Regards,

 

Ruediger

 

Von: Ingemar Johansson S <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org> 
Gesendet: Freitag, 24. April 2026 13:43
An: tsvwg <tsvwg@ietf.org>; l4s-discuss@ietf.org
Betreff: [tsvwg] 5G+ Ultra (aka L4S)

 

As a FYI
L4S support in 5G is now definitely being rolled out
https://www.telekom.com/en/media/media-information/archive/5g-ultra-for-video-calls-1104096 
And for those who can, and wish to order the new option.

https://www.telekom.de/optionsuebersicht/mobilfunk/5gplus-ultra 


/Ingemar

=================================

Ingemar Johansson  M.Sc. 

Master Researcher

 

Ericsson Research

GFTL ER NAP NCM Netw Proto & E2E Perf

Laboratoriegränd 11

977 53, Luleå, Sweden

+46-73 078 3289

 <mailto:ingemar.s.johansson@ericsson.com> ingemar.s.johansson@ericsson.com

www.ericsson.com <http://www.ericsson.com/> 

 

      Experience is merely the name 

          men gave to their mistakes.
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