Category: Uncategorized

The Cell Hunters

I’ve recently discovered the blog of James Pole who’s writing about wireless networks in New Zealand. Looks like he is a ‘cell hunter’ and has good background information about how GSM, UMTS and cellular networks look like in practice. That reminds me of Nobbi, a German enthusiast who’s also got an interesting site about GSM cells and network monitoring. If you speak German and are interested in the topic his site contains a lot of gems.

If you know about other people who write about the topic, please leave a comment.

New EU Regulation Mandates Operators To Inform Customers Of Roaming Costs Via SMS

Here’s an interesting additional piece of information on the EU decision to limit prices for European users roaming with their mobile phones to other EU countries: According to this Teltarif article, the EU roaming regulation coming into effect this summer not only limits prices but also requires operators to inform their customers via SMS of the prices they charge for incoming and outgoing calls when they detect that a user roams in a foreign EU network. Applause for this piece of legislation because I am sure 9 out of 10 people today have no idea who much they are charged when making or taking phone calls while abroad. Also, this is in my opinion the first positive usage for roaming detection devices that usually trigger useless SMS messages in the "Welcome in country XYZ, please use the network often for (undisclosed) roaming charges" fashion 🙂

Antenna Hide And Seek

Another reflection from my recent visit to the U.S.: While in Europe cellular towers and antennas can be spotted easily and everywhere be it both in cities and countryside, I was a bit astonished to only rarely notice them in the U.S!?

After a couple of days I figured out why: Many of the antennas are put directly on walls of taller buildings instead of on top of buildings and are sometimes even camouflaged. The sophistication ranges from using a similar color as the building up to painting the house’s brick structure on the antennas itself. Not sure if the trend continues as I saw quite a few examples of camouflaged antennas on buildings and the usual grey antennas on the top of the building, probably newer and by another operator. No longer a need for hiding them?

The Carnival Of The Mobilists #78

Cotmbutton
Ricky over at Symbian Guru hosts edition 78 of the Carnival of the Mobilist this week. The Carnival is definitely THE resource out there that captures the best articles written about wireless in the past 7 days in the blog sphere. Only quickly browsing over it before writing this reference, I’ve already discovered David Beer’s article analyzing Palm’s strategy for the Foleo. Can’t wait to go in depth on the rest as well. So head over and enjoy!

Where’s the MAC Modem Driver For S60 Phones?

Tommi over at his S60 blog brings us the good news that Nokia has stepped up its activities to bring better support of N-Seires phones for Mac users. What I am still missing and constantly keep looking for is USB modem support for S60 phones. I am close to consider buying a Mac notebook when my current computing equipment needs replacement but this is one of the few things that still keep me from really doing it.

Some will say, pah, not needed, just use Bluetooth to connect to the phone. Good idea, but not fast enough anymore for HSDPA phones such as the N95. Anyone aware that USB modem drivers for the MAC exist for N-Series phones and I just did not find them so far?

Another theoretical approach might be to have a virtual machine running with Windows XP inside and install the drivers there!? Anyone tried this before? I haven’t the slightest clue if it’s possible. Even if it is would it be possible for Mac applications to use a dial up connection running in the virtual Windows XP? Any news and hints welcome!

Amazed By The Wifi Mesh of MIT’s One Laptop Per Child Project

Last week I had the enormous pleasure to have been invited to MIT’s Media Lab in Cambridge, Massachusetts to take a look at their activities and in particular the One Laptop Per Child (OLPC) project. Walter Bender gave an intro and a hands on demo of the laptop and as you can see on the picture on the left he had all the eyes and ears of the audience.

Olpc_sm
It’s difficult if not impossible not be amazed by any part of the project and the green/white prototypes of the laptop and its software. As somebody who looses a word or two every now and then about communication and networks, I was especially interested in the Wifi Mesh network implementation and what kids can do with it. Communicating with each other, playing, painting pictures etc. etc. and of course get access to the Internet if a gateway is in reach of just one of the laptops forming a mesh network. Individual laptops act as a mesh node even when they are switched off. Great stuff! Details about the OLPC project in general and about the mesh implementation (complying to the current draft of 802.11s as much as possible) specifically can be found here.

The 3GSMWorldCongress Has Been Rebranded

Heike Scholz over at "Mobile Zeitgeist" is at the pulse of the time with her report that the 3GSMWorldCongress has been re-branded by the GSM Association into the "Mobile World Congress".

It’s an interesting move but I still haven’t figured out the real reasons for it… I think it’s more than just a new marketing strategy. Has there been a struggle about the rights to the name? Anyone?

Removing "3GSM" from the name of the conference opens up a number of interesting possibilities for the congress to develop in the future. The official statement for the re-branding is:

"The GSMA is rebranding the 3GSM World Congress and its sister event in
Asia to reflect their role encouraging the development of compelling
new mobile services for end-users."

I am not quite sure how the re-branding will help that goal!? Anyone? By removing "3GSM" from the name the congress might open up potentially for other technologies to be also present. We saw a bit of this already this year with a number of people showing WiMAX at their booths.

Another possibility for the name change could be that the GSM Association now considers GSM and UMTS to be the world’s dominant wireless standard implying that it’s obvious that a mobile world congress can only be about this technology!?

Whatever the reasons are I am sure it’s more than what they say in their official statement. Comments welcome.

WiMAX Waves

Lately, I’ve stumbled over statements like "Our WiMAX product supports 802.16e Wave 1 and 2 feature sets". It’s mentioned a lot but nobody goes into the details of what kind of features the different "waves", or versions, actually contain. So I’ve done some research on my own. I still don’t have all the details, but at least some clues.

From an article on "Mobilehandsetsdesignline":

"…The Wave 1 feature set focuses on single-input, single-output antenna systems and basic mobility.


On the heels of Wave 1 will be Wave 2 certification testing. In addition to Wave 1
backward compatibility, Wave 2 focuses on advanced antenna array
features such as multiple-input, multiple output (MIMO) arrays and
using space-division multiple access (SDMA)-based beam forming. Wave 2
will most likely begin testing in late 2007 or early 2008. …"

And from "Informatm":

Wave 1 mobile WiMAX certification will embrace products in the 2.3GHz and 3.5GHz profiles. Wave 2 certification will then feature 2.5GHz products, and products with smart antenna capabilities like MIMO and beamforming.

In 2.3GHz the Plugfest tested channelization in the 8.75MHz range
for the Korean WiBro profile and 5MHz and 10MHz for the rest of the
world.

In 2.5GHz and 3.5GHz frequencies the channelization was 5MHz and 10MHz and in 3.5GHz the 7MHz profile was also utilised.

And finally, here’s a link to an Intel presentation where physical layer (only) functionality of wave 1 and wave 2 devices are described on the final two pages.

Is anyone aware of an official and published full list of wave 1 and wave 2 functionalities on all layers? If so, please let me know.