Before I installed my first Jitsi server I thought that it must be quite a complicated affair. I searched around a bit and found a simple way to install it via a docker-compose script. The Docker script sets up a couple of Docker containers that encapsulate the different programs required to run the Jitsi-meet server such as the web server, the xmpp server and other stuff. Neat. However, there were two problems that prompted me to search for another solution in a hurry.
Are New SIM Cards Required for 5G SA?
When LTE was launched a decade ago a clear cut was made from GSM security when it came to SIM cards and authentication. As far as I remember, LTE was the first system in which mutual authentication between network and devices became mandatory. Fortunately, by the time LTE came around the corner, most subscribers already had a UMTS capable SIM cards that supported this so there was only little pain. So how about 5G?
The Data Rate of a Jitsi Voice Call
Over 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.
I’ll Do A Live Jitsi Meet Install Session at ‘Hidden Service’ – The First DiVOC Event!
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…
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
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.
600 Mbit/s Outside – 6 Mbit/s Inside
5G is slowly making its way into Cologne with incredible date rates. Recently, however, I discovered just what it means to have a simple insulating window between you and the network outside.
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’.
I’ve Got 5G At Home Now!
A 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.