The Data Rate of a Jitsi Voice Call

Jitsi - voice data rateOver the past couple of weeks I’ve been using my own Jitsi instance for many voice and video calls between family and friends. It’s easy to install and use on mobile devices, which is of prime importance when asking others to communicate with you in a different way than how they are used to. One thing that made me raise my eyebrows a bit, however, was the data rate of a simple one to one voice call.

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I’ll Do A Live Jitsi Meet Install Session at ‘Hidden Service’ – The First DiVOC Event!

Hidden Service conference logo

Easter is coming and most of us will be staying at home this year. Sadly, that also means that Easterhegg, a ‘small’ German hacker event organized by the Chaos Computer Club Hamburg, has been canceled. But far from giving up, the organizers have decided to experiment how such an event could potentially be organized in cyber space.

So Easterhegg 2020 has become Hidden Service (hiding Easter eggs I suppose…), a DiVOC event, which stands for ‘Digital Verteiltes Online Chaos’. The official translation is ‘Digitally Distributed Online Chaos’ but maybe they should have translated it to ‘Distributed Virtual Online Chaos’ to match with the abbreviation. In any case, read it backwards, add a 19…

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5G Standalone Architecture – RRC Inactive State

The show must go on, so at some point, network operators will start putting 5G core networks in place which means that mobile devices will use the 5G NR Standalone (SA) air interface for signaling instead of LTE anchor cells. So I had a look at 3GPP TS 38.331 which contains the Radio Resource Control (RRC) specification to see how RRC is done in 5G.

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Jitsi Meet and the Number of Video Participants

Jitsi video conference
A Jitsi video conference with many participants – video channels pixelated for privacy 🙂

In the previous blog entry, I’ve been looking at a number of different commercial video conferencing solutions and if they offer native Linux support. There are a couple of fabulous products with good Linux support out there that easily support sessions with 15-20 simultaneous video participants. Unfortunately, from a privacy and confidentiality point of view, most of them don’t fare very well at all.

As confidentiality and privacy are very important to me, a potential solution for me and others is Jitsi, which is open source from client to server and can be installed on private infrastructure. The big question for me was however: How many video participants can the clients and the server handle in a single conference? A search on the web didn’t really result in a good answer. So I set out to find out for myself.

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Linux and Conferencing Solutions

Like many others in the industry, I am doing a lot of work in my ‘home office’ lately while the Corona virus continues to make normal life as we know it impossible. A lot of people, including myself, have started to use various video calling and conferencing solutions a lot more than before and I was quite surprised how many of those closed source and commercial solutions have a native Linux implementation.

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The Endless Flat Rate

Fun post today: Once upon a time, the term ‘flat rate‘ for Internet connectivity meant that you pay a monthly fee and could use the Internet as much as you wanted. But then a lot of mobile network operators started to misuse the term. While still offering a fixed monthly price, the amount of data was limited. Once that amount was used up a speed step-down to a few kilobits per second would be enforced for the rest of the month. At these speeds, Internet connectivity is pretty much useless these days. So much for the ‘flat rate’, the term was totally burned.

Now, more and more operators have started to offer ‘real’ flat rates without a speed step-down. But how do you advertise this? One German network operator has decided to use the German word “endlos” (endless). I admit I had to smile. After years and years of using English words in advertisements because it’s hip and cool, they had to revert back to German as they’ve run out of English words and ideas that haven’t been misused in this context.

The Cloud Native 5G Core Network

When you look through the 5G core network specification documents of 3GPP such as TS 23.501 and 23.502 the idea I got was that it’s pretty much the same as before. Yes, the interfaces and network components have new names but by and large the 5G core network does the same things as today’s core networks and also pretty much in the same way. One thing that stands out just a little bit, though, is that control plane network components are now referred to as ‘functions’ and that the interfaces between them are now ‘service based’. In practice, that means the interactions are now stateless and use http query/responses and data is encoded in JSON format instead of the stateful connections with protocols for signaling interactions as before. O.k. so fine, I thought, 3GPP has moved to web based technologies. But that’s only the tip of the iceberg according to this interesting paper from 5G Americas on ‘5G and the Cloud’.

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I’ve Got 5G At Home Now!

Image: 5G speeds in CologneA couple of weeks ago in January 2020 I spotted the first 5G antenna at the cell site that serves my home in Cologne on my way home. My first reaction: ‘Hm, that wasn’t there this morning…’. It wasn’t switched-on straight away. but when I came back from vacation early in February, I was greeted with a 5G logo after arriving at home. And even without ‘holding the phone the right way’ I immediately got well over 660 Mbit/s out of the downlink channel.

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5G RRC Protocol And How It Compares to 4G RRC

Recently I’ve been looking a bit at the 5G NR Radio Resource Control (RRC) protocol in 3GPP TS 38.311 to get an idea how it is structured and how it compares to the LTE RRC protocol specified in 3GPP TS 36.331. As Ralf points out in the comments below (thanks very much!) some parts of it are already used today to embed 5G configuration information in 4G RRC messages for EN-DC, while other parts will become relevant with 5G NR Standalone, i.e. once a 5G core network is available and devices and the gNBs have implemented standalone operation.

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