Last year I reviewed ‘Dealers of Lightning‘, a great book about Xerox PARC in the 1970 where pretty much all of the technology was invented we are still using today on our graphical user interface based PCs today. Over the past year a number of very interesting videos have appeared that are a great complement to the overall story and impressively show just how many things were invented there.
Continue reading ‘Dealers of Lightning’ Revisited – Xerox Alto Videos
A few years ago a number of clever guys figured out how to access the layer 1 functionality of a certain type of modem chip built into entry level GSM phones and implement the GSM stack on a PC. I had a lot of fun getting that to work in a virtual machine and I learnt a lot in the process. Now a few guys have come up with something at least equally impressive: An open source implementation of an LTE eNB base station and an LTE UE.
Software updates are great because they keep installations secure and add new functionality. Moving from one Debian version to the next, however, is sometimes a bit painful for projects that modify system configuration files. My VPN-Wifi-Pi project that uses a Raspberry Pi as a Wifi Access Point and an OpenVPN tunnel to a VPN server for secure Wifi access in hotels and other places is unfortunately no exception.
Wi-Fi is the Internet access technology of choice just about anywhere indoors these days. But just how many people can you connect with Wi-Fi in a small space and still get acceptable (my definition: > 10 Mbit/s) datarates?
5G is many things to different people. For most, 5G is about more network capacity and faster speeds for Internet access. The main challenge for this goal is that there is little spectrum still available below 6 GHz, a frequency that is generally seen as the limit for the current air interface technologies around. So 5G below 6 GHz brings only few benefits for the broadband Internet use case, it could easily be done with LTE as well. Ultimately, to get to higher speeds and more network capacity, higher frequency bands have to be tapped. The problem here is that with conventional technologies, communication range is severely limited.
Setting up Eduroam on a PC securely including certificate checking during authentication to prevent password theft is quite a bit of a challenge but not impossible. On Android, things are even more difficult and it’s a bit strange that many universities are showing how to configure Eduroam manually on their help pages rather than linking to the Eduroam Configuration Assistant Tool (eduroamCAT) web page that makes things a lot easier.
Recently, I’ve been thinking a bit how network densification will look like once the capacity of macro cells is no longer sufficient to satisfy demand. As statistics keep telling us, a significant part of cellular data traffic is not generated outdoors but actually indoors. When densifying the network its unlikely that this would work well from the outside, densification has to be done from within buildings.
Continue reading Small Cell Network Sharing As A Way Forward To Network Densification?
While traveling, I recently spent some time on a University campus in the US and sat in the Library reading room for a few hours. When I observed the students there for a while I noticed that none, not even a single one of them used a mouse with their computers. Instead, they were all using the touchpad of their notebooks while I was the only one in the reading room who actually had a mouse at the side of this computer.
When I was recently at the Ohio State University for a few days I noticed the following interesting statistics about their Wi-Fi network:
Quite impressive numbers, especially when setting them into perspective:
Continue reading 11.000 Wi-Fi Access Points At Ohio State University
Time flies and it’s already 3 years since the previous edition of my book became available. Time for an update and I’ve worked hard over the course of the past 12 months to ensure my introduction book on wireless networks continues to reflect the latest state of how the technology is deployed and functions in practice. A lot of things have happened in the past three years so I had to adapt the title a bit and the third edition is now called ‘From GSM to LTE-Advanced Pro and 5G‘! So what’s new?
Continue reading From GSM to LTE-Advanced Pro and 5G – My Latest Book Is Now Available!