Sometimes it is just a lot more convenient to do a map search on the PC rather than on the phone. Nevertheless I still want to have the result in Osmand (OpenStreetMap for Android) on my smartphone for later use, e.g. for car navigation. So my approach so far was to first search the location on the PC and once I knew where it is I would manually locate and bookmark it on the smartphone again. Far from ideal… However, I just found out a much simpler way to do this by accident:
After upgrading to VDSL vectoring with a 100 Mbit/s downlink and 40 Mbit/s uplink in Cologne recently, I soon figured out what to do with the additional uplink speed: Advanced synchronization with my network behind a fiber line in Paris. Equally soon I noticed that no longer is my access link the bottleneck but rather under-dimensioned backbone links. So I had to find a way to creatively route my traffic around the problem.
In 5G, Massive MIMO is considered as the holy grail to increase individual datarates, to improve cell capacity, to extend range, or any combination of these. mMIMO is not a single technique, however, there are a number of different flavors that can to a degree be mixed and matched to achieve different things.
I recently came across this paper of Huawei on 5G Spectrum matters and one paragraph in particular caught my attention:
“[…] inter-operator synchronisation and alignment of uplink/downlink transmissions (slot and frame synchronization) is […] necessary for efficient deployment of 5G NR networks in unpaired assignments.”
In other words this sentence says that network operators using adjacent spectrum have to synchronize their radio networks to avoid interference. So why is this necessary and what exactly does that mean?
Remember the days when you traveled in Europe and had to pay high prices for voice and data roaming as soon as you crossed a border or had to buy a local SIM card for reasonably priced mobile Internet access? It seems like those days are long gone but that’s actually not the case, free roaming in the EU only came into effect last year. And even worse, there are still places on mainland Europe apart from Switzerland that are not part of the EU, where one gets a bitter reminder of how things were in the past. An interesting example is Monaco.
Interested in the past, present and the future of microprocessors? If so, the video of Sophie Wilson talking about the ‘Future of Microprocessors’ at Juliacon is a must see! In case the name Sophie Wilson doesn’t ring any bells, have a look at what Wikipedia says about her.
Her presentation will not only tell you about the history of microprocessors but also why performance hasn’t really increased in the past years, the reasons behind this and why the price per transistor on a chip has started increasing again with further miniaturization instead of further decreasing, which has fueled Moore’s law for the past decades. And most important she will give her educated opinion on where we will go from here.
The abbreviation EN-DC (eUTRAN New Radio – Dual Connectivity) indicates that in this type of 5G deployment, 4G LTE and 5G NR will be used simultaneously. However, it looks like that the combination of some frequency bands might prove to be a bit problematic due to self interference as laid out in this interesting whitepaper recently published by Keysight (see page 4).
A few days ago, there’s been a great talk about G.Fast at the Local Chaos Computer Club chapter (C4, Cologne) by Stefan Förster of NetCologne. Here’s a link to the video of the talk (in German). I was particularly interested, because NetCologne recently announced that they have finished their G.fast trial (using the existing telephony copper wiring in buildings) and are about to start commercial service. This sounds like great news and I had quite a number of questions in my mind, including how G.fast can coexist with VDSL Vectoring that the the national incumbent offers in Cologne today.
I couple of days ago I was wondering what Supplementary Uplink (SUL) for 5G is all about, if it is supported for EN-DC (simultaneous LTE+5G data transmission) and what potential benefits it might have.
I can pretty much understand how SUL would help for 5G standalone operation, let’s say on 3.x GHz. The problem here is the limited uplink transmission power of mobile devices which will be the limiting factor when it comes to cell range. The idea of SUL is to add an uplink transmission path on a lower frequency band that can reach farther. Also, it could increase 5G uplink transmission speeds, because I assume that in TDD operation, most operators will give as much of the 3.x GHz carrier capacity as possible to the downlink.
One thing that I think borders on modern (digital) piracy are the charges for data roaming on board of (some) ships. Cellular on-board networks are often connected via satellite and typically, 1 MB of data transfer, which is barely enough to load the front page of a web site these days, is charged in steps 1 euro per 50 kb. In other words, a single web page costs 20 euros to download. No sane being on this planet would ever want to do that so I assume that 99.9% of the revenues generated that way are from people who’s mobile automatically registered to the on-board network when it looses contact to the land based network for a while.