This post might be a bit out of the overall context but I thought it couldn’t hurt to loose a few words about a recent coding project of mine. As you might have noticed, I have put some of my open source projects on Gitlab after emigrating from Github last year (and moved on to … Continue reading Creating Libreoffice Documents on the Server with PHP
Today lets have a look at how the 5G Core (5GC) does Connection-, Registration- and Session-Management for 5G devices. As in the previous posts, the procedures are described in 3GPP TS 23.501 which is the 5G analog to the 4G LTE core network description in 3GPP TS 23.401. I guess the similar number is no … Continue reading The 5G Core – Part 6 – Connection-, Registration- And Session Management
Last month, Ubuntu 18.04 LTS was released and I could hardly wait as I wanted to do a major redesign of my cloud services at home to streamline my setup and make it more flexible, extensible and powerful. So let’s virtualize it!
If you go by 3GPP and common sense it can be expected that most operators having an LTE network today will launch 5G as what is referred to as 5G EN-DC (eUTRAN New Radio – Dual Connectivity), a.k.a. 5G NR ‘option 3’ in 3GPP circles. In other words, mobile devices will still camp on the … Continue reading What Comes After 5G EN-DC?
5 years ago I wrote an obituary on the Thalys train on-board Wifi system. After a brilliant start in 2007 the system was working well for a while before it more and more became unusable. Fortunately, while cellular coverage on the German part along the tracks was and still is lousy, mobile network operators in … Continue reading Thalys Improves On-Board Internet Access – Somewhat
When GSM was designed, the network and the voice service running over it were inseparable. That’s because the GSM network was designed in the 1980s as a mobile voice network. Fast forward 20 years and the picture had changed significantly with LTE having been designed as a wireless network that only transports IP packets. Agreed, … Continue reading VoLTE and VoWifi – Wireless Telephony Has Truly Become Network Independent
In the good old fixed line SIP world, the originator of a speech call told the other side which speech codecs it supported. The other side then picked a suitable codec and informed the originator about the choice. That was it and things were ready to go. In VoLTE, you might have guessed, it’s not … Continue reading VoLTE – Some Thoughts On Codec Negotiation
Yes, I’m a comparatively late convert to Open Source as I’ve only installed Linux on a production machine I used for everyday work back in 2009. At the time there wasn’t a lot of discussion about using a 64 bit version of Linux on x86, the mainstream was still on 32 bit at the time. … Continue reading Is It Time To Move To AMD64?
Microsoft Windows 10 behaves like a spy under your fingertips these days, Apple gives you less and less freedom on its desktop OS, so there's never been a better time to regain privacy and freedom by switching to Linux on the desktop. Over the years I wrote many articles on this blog about my Linux … Continue reading Moving to Linux Full Time – Dan Gillmor Writes About His Experiences
Every now and then it would be great to have a full operating system on a tablet rather than Android or another mobile optimized and castrated replacement that is just too inflexible for my taste. From some reports I've seen over time I was aware that Ubuntu has some sort of touch screen and on-screen keyboard integration but little is written about it. Recently, I came across the Lenovo Yoga 3 – 11" that has a 360 degrees rotatable keyboard and a touch screen. It can be used as a Laptop, as a screen only with the keyboard as a stand and in a full "tablet" like mode with the screen rotated 360 degrees so it rests on the backside of the keyboard. That sounded interesting and it's price tag of €599 fit my idea of what I would pay for such a device. But would it run Linux in a way that the device is usable in a non-keyboard mode? I tried hard to find more information on the net but came up pretty much empty handed. So I decided to give it a try myself as some of the stuff that I found at least indicated that it could work. After about a week I'm ready to give you an account of how it went from me, so here we go. It's going to be one of those long blog entries so if you only care for the summary, jump right to the end the post. Otherwise just read on for the nitty-gritty details of my adventure.