So there we go, first mobile network operators in the US and Korea have officially announced that they will start VoLTE (Voice over LTE) service with the Samsung Galaxy III shortly. Sounds interesting, but I've been using Skype on 3G for years now which is also Voice over IP and it has worked quite well. … Continue reading US and Korean Operators Launch VoLTE – Some Thoughts
All answers have been held as short as possible and require an understanding and study of the corresponding chapter of the book. Answers for the LTE and VoLTE chapters: LTE Answer 1: A 10 MHz FDD LTE channel is split into 600 sub-carriers. LTE Answer 2: X2 Handovers are performed directly between two eNodeBs while … Continue reading LTE and VoLTE Q&A
As I tend to be a bit on the security conscious side of the discussion, I like the 2G-Allow switch on my Pixel 6 with LineageOS. By disabling 2G, I’m not prone to fallback attacks by network jamming and my device recovers more quickly from a loss of LTE coverage. For most of my daily … Continue reading ‘Allow 2G’ Switch in Android – How About Roaming?
It’s March 2024 and for the first time in 5 years (thank you Covid pandemic), I was in the US again. So far, so good, but there is one significant difference this time, at least from a technical point of view: For the first time ever, I’m roaming with Verizon! Most travelers won’t even notice, … Continue reading Roaming Report – Part 1 – Roaming with Verizon – A First!
It’s the time of the year again to reflect on what has happened in the last 12 months. It’s been quite a ride again, with many things happening, and also some things not happening. So if you are interested, come with me on a trip through my year in tech 2023.
Over the past years, I’ve been using LineageOS on a 2019 high end smartphone. It has served me well over the years. When LineageOS moved from Android 11 and 12, however, they wanted me to side-load a new ROM image instead of using the app based updater. As I wasn’t sure if this update would … Continue reading LineageOS 20 on a Refurbished Pixel 6
After seeing the many transmission errors over the Starlink air interface that TCP can handle quite well, particularly on Linux with the BBR congestion avoidance algorithm, I was of course wondering if this has an audible impact on real time voice services when used over Starlink. So here’s how that went:
And while I’m already writing about recent personal roaming firsts, I should also mention that I saw my first personal 5G use while roaming in Austria in May 2021.
In just 6 weeks from now, two of the three German wireless network operators will switch-off their 3G networks. This has long been in the cards and gave me a bit of a worry. This is because I run LineageOS on my personal smartphone, and since it has a somewhat esoteric chipset from a LineageOS … Continue reading 3G Switch-Off and Conversations
Now that the non-Standalone (NSA) flavor of 5G has been pretty much established around the globe, it is likely that more focus is put on the 5G standalone (SA) flavor of the technology. In effect that means two things: Instead of using LTE as an anchor for a 5G air interface connection, 5G can stand … Continue reading Voice over NR Whitepapers