Zeebo: Gaming For The Next Billion

At a recent games developer conference, Brazil based Tectoy presented their new video gaming console called Zeebo for the next billion. Looking at the specs it's clear that it doesn't want to compete with other current gaming consoles, which have much more processing power. Instead, this gaming console is targeted at emerging markets where people can not afford other consoles and much less to buy high priced games. The interesting twist in this case is that Zeebo has a built in 2G/3G modem to download games so there is no need for establishing physical distribution channels of any kind. I guess that this will help to save a lot of cost.

I can imagine that at some point, the wireless connection might also be opened for other uses such as multiplayer gaming, e-mail, the web, etc. First to be sold in Brazil, Tectoy has brought Claro on board as a network partner and the Wiki article linked above mentions a lot of game companies who will supply games.

The chipset of the box will be supplied by Qualcom, who, according to this article, has invested $5.5 million into Tectoy and BREW will be used as a software platform (only mentioned once in the article, no great details on this, so this has to be investigated a bit further). BREW of course is already known from CDMA based mobile phones in the US so I there are already a lot of developers out there that could easily port their games to the console.

There we go, this is one of the first wireless but non mobile devices with built in 3G connectivity beyond todays mobile and notebook / 3G dongle centric devices for the mass market that I know of. And who knows, maybe a role model for a future wireless game distribution model for high-end game consoles.

HSPA Uplink Speeds from 1 to 11.5 MBit/s

A couple of days ago I had a post on the currently defined downlink speeds of HSPA from 1 to 80 MBit/s. As the uplink is just as important as the downlink for many application, 3GPP has also kept improving data rates in this direction. The following table shows the speeds defined up to Release 8 of 25.306.

  • Category 1 , 10ms:  0.7 MBit/s
  • Category 2,    2ms:  1.4 MBit/s
  • Category 3, same as 2 but only 10ms TTI
  • Category 4,    2ms:  2.8 MBit/s
  • Category 5,  10ms:  2.0 MBit/s (no, not a mistake, it's slower)
  • Category 6,    2ms:  5.7 MBit/s
  • Category 7,    2ms: 11.5 MBit/s

For the nitty gritty details see table 5.1g. To get to the raw speeds quoted above, divide the maximum number of bits per transport block by the transport block length (the tranmit time interval). Example: Category 2 mobiles can send up to 14484 bits in 10ms (TTI). That's 14484 bit / 0.001s = 1.448 MBit/s. Note that there are 2 TTI lengths, 10ms and 2ms. For higher speeds, shorter TTIs are needed and the 2ms block has to be used for maximum speed.

The speed increases are achieved by lowering the Spreading Factor from 4 to 2 (i.e. how many bits (or chips to be exact) are required to encode one user data bit on the air interface) and by increasing the number of simultaneous code streams (from one in category 1 to four in category 7).

A strong word of caution: Like for the downlink, these values are top speeds. The higher the maximum speed the less likely it is a user will experience them in a live newtork as the signal conditions under which they are achievable are only available in an ever shrinking part of a cell. Most users will not see such high speeds, especially when they are indoors and have no line of sight to the base station antennas.

VOLGA Forum Publishes Stage 1 Specification for CS Voice over LTE

Not too long ago I reported on the foundation of the VOLGA (Voice Over LTE via Generic Access) Forum, which, as the abbreviation implies, wants to specify and implement a pragmatic approach for using the current circuit switched voice solution can over LTE. Looks like they have been quick to start their work, as the Stage 1 document for the proposed service is now already available on their website. Stage 1 is the first of 3 steps to describe a service from the basic concept (stage 1) to methods and procedures (stage 2) to the fine details including composition of messages (stage 3). Beyond what's already been written in 3GPP TR 23.879, I found the following interesting details:

  • The interface between the Volga Access Controller can be either A (GSM) or Iu (UMTS), in either their tradition variant or over IP. So if IP is selected the VOLGA solution is end to end (compare also to my R4 MSC post).
  • Transcoding Free Operation (TFO) shall be supported
  • H.324M for Video Calls shall be supported (great, completely forgot about that)

So, as you can see, quite some interesting details in the document, despite only being a stage 1 document.

Can't wait to see stage 2 and stage 3. Congrats to the VOLGA forum for the swift action!

Book Review: Wireless Broadband – Conflict and Convergence

Mobile-broadband
Wireless Broadband – Conflict and Convergence. Sounds interesting, I decided, so I got a copy, not the least also because I know the work of Vern Fotheringham's co-author, Chetan Sharma, which I find very interesting and I have quoted him in my recent book.

Everybody always says the telecommunications market in the US is different from the rest of the world and this book explains why. The authors first go a bit back in time to explain how the telecommunications act of 1996 was designed to introduce competition in the US telcom market. 12 years later, the authors contest an utter failure of the policy, with AT&T and the baby Bells back in control both of the fixed line telephony, DSL and wireless sectors with little hope for change on the horizon. It's very interesting to follow the twists and turns and to compare it to what happened in other countries in which similar regulation attempts have been undertaken, sometimes with more, sometimes with less success.

It's a bit of a shortcoming of the book that the authors have not undertaken this, since similar decisions have been taken elsewhere, often with more success due to fine tuning over the years or by using a different approach to regulation altogether. Also, in my opinion, the book is a bit too optimistic on the influence WiMAX will have on the overall competitive situation. In today's world, where it is not enough to be a powerful player in only a single country, even with 300 million people, I have my doubts if the single nationwide WiMAX provider in the US can really make a difference, with wireless devices not optimized for voice and produced only for a relatively small audience. While GSM and CDMA based networks in the US share the later problem, they still have a big advantage with their inherent voice capability. Well, time will tell.

So no matter if you live in the US or somewhere else and would like to know why the telecommunication sector in the US is what it is today and how it could potentially evolve in the future, this book is definitely for you!

HSPA+ Speeds in Which Areas

I keep mentioning in posts on HSPA data speeds that one has to be very careful when using such numbers as they represent the theoretical maximum that is only reached very close to the base station. In various presentations, one can often see graphs where speeds are shown over the percentage of users, i.e. what speeds 95% of the users are experiencing to the speed only experienced by 5% of the users. But what does that mean when plotted over a geographical area?

Ericsson has done a great job of visualizing this in their 1/2009 edition of the Ericsson review on page 8 figure 2. I can't reproduce it here, but I encourage you to follow the link and check it out for yourself, it's very insightful! As you can see in the 3 pictures, which represent various stages of the HSPA+ evolution, the direct benefit of adding higher top speeds gets more and more limited the higher the speed.

What the pictures don't show, however, is that subscribers not enjoying the best radio coverage do also benefit from higher speeds, in a different way though. By having at least some users in the zones where data can be transmitted faster, users under ordinary conditions benefit because the overall cell capacity has increased, as some uses can transfer their data faster, thus leaving more time to serve other users.

Great visualizations, thanks to Stefan Ström, Dirk Gerstenberger, Johan Bergman and Fredrick Gunnarsson for the article!

In Case of Emergency (ICE) Information on the SIM card

During the Mobile World Congress in Barcelona this year, I heard from Adrian Scrase for the first time that 3GPP has specified how to put information on the SIM card for "In Case of Emergency" (ICE) events, i.e. to help first responders to identify someone and to contact their next of kin.

A great idea and now that it is specified it will hopefully become a worldwide accepted feature. It's not in current phones and SIM cards yet so it will take a couple of years for the feature to be added. Let's keep our fingers crossed a critical mass is reached so people actually enter information and first responders actually use the feature.

As somebody asked me over at Forum Oxford at how it will work in practice, I've had a look at the standards:

  • The user enters ICE information like names of persons, relation to these persons and phone numbers. For details see 3GPP TS 22.101, A28
  • During an emergency, the information can be retrieved by pressing '* * *'. That's specified in 3GPP TS 22.030, 6.8
  • The information is stored in a new file on the SIM card referred to as EF(ICE_DN) and the format is described in 3GPP TS 31.102

Carnival of the Mobilists (G20 Edition) at London Calling

Cotm-button
It's time for another Carnival of the Mobilists and this week's edition is hosted by Andrew Grill over at London Calling. As always, a great read and I fully agree with Andrew on the post of the week by Dennis Bournique where he explains that despite recent misinterpretations, the iPhone does not account for more than 50% of the US mobile data traffic.

So for the latest and greatest from the mobile blogosphere, head over and enjoy!

I’ll be Presenting at the Forum Oxford Future Technologies Conference

You might have noticed my earlier post on my upcoming Oxford University course on LTE Services I'll be doing together with Ajit Jaokar after Easter. In addition to that I am happy to announce that I've also been invited to speak at this year's Forum Oxford Future Technologies Conference on Friday, April 24, 2009.

My topic: Evolution of Mobile Networks. Impact and Possibilities for Future Services.

As I attended last year as a visitor myself, I fully agree with Tomi Ahonen that this is the "can't miss event" of the year and it's at a very moderate price as well. Most of last year's presentations were filmed and the event's web site has links to the individual presentations.

Here's the provisional agenda:

09:00 start (speakers shown in order of presentations)

* Professor William Webb, Head of Research and Development, Ofcom
Presentation: Wireless Communications: The Future Revisited
(I reviewed his book on the same topic here)

* Nick Allott, Chief Technical Officer, OMTP

* Graham Trickey, Senior Director, GSM Association (tbc)

* Phil Northam, Global Manager, Samsung Mobile Innovator
Presentation: 'War is Peace'.

* Martin Sauter, Wireless Consultant and Author, WirelessMoves
Presentation: Evolution of Mobile Networks. Impact and Possibilities for Future Services.

* Mark Curtis, CEO, Flirtomatic
Presentation: Dislocation of Expectation: the Challenges of a Mobile Start-up.

* Simon Cavill, Chief Technology Officer / Director of Strategy, Mi-Pay
Presentation: “Show me the Money!” – Why mobile money is this year's Next Big Thing.

* Professor Ed Candy, Chief Technology Officer, 3 Group

* Tony Fish, CEO, AMF Ventures
Presentation: My Digital Footprint.

* Helen Keegan, Specialist in Mobile Marketing, Advertising and Media, Beep Marketing
Presentation: Media and Marketing in a Mobile 2.0 world

* Agustin Calvo, CEO, Movidream, Spain
Presentation: A Mobile Marketing Evolution to Contextual Interactivity and VRM.

* Christine Maxwell, Chief Information Architect, MobileWorks 3D Inc.
Presentation: Use of the Arts in Designing the Mobile World

* Ramu Sunkara, CEO, Qik (tbc)
Presentation: The Revolution Will Be Live Streamed: Live Mobile Video for the Masses.

A great lineup I would say and I am also looking forward very much to the lively discussions between all attendees during the coffee and lunch breaks and to the always stimulating and controversial Q&A sessions after the presentations.

And some more links for those of you who'd like to find out more:

Hope to see you there!

Picocells in Action

Pico- and Femtocells have been a hotly debated topic at the Mobile World Congress this year and to my great pleasure I've been offered the opportunity to have a look at a real Picocell installation in a live network after returning home.

So one day, I was invited to visit an installation at a shopping mall, where a number of GSM picocells from IP.Access were deployed, as the surrounding macro network did not cover the interior of the mall very well. In essence, this means that the picocell was deployed as a coverage filler rather than to add capacity to the macro network.

It looks like the network operator using the picocells was not the only one having coverage problems, as I saw a number of repeater antennas throughout the building from other operators. Repeaters are another solution to get in-house coverage but I was told that while it sounds easy enough, they are rather tricky to deploy as permission is needed for the external antenna on the roof. Also, the coax cables running through the shopping center to the antennas inside are quite expensive and again a permission is required to lay the cables and install the antennas in the hallways.

Picocells on the other hand require no permission whatsoever and the installation is rather trivial: A phone line for DSL that serves as a backhaul link, a DSL modem and the picocell itself, that's all it takes. In the specific installation I was shown, an Ethernet switch was connected in addition as the DSL link was also used to connect the computers of the shop back to the mother ship. Quite a nice setup as the backhaul cost for the picocell is effectively zero that way.

I ran a couple of calls over the picocell and couldn't tell the difference in voice quality in the picocell compared from that in the macro network. Moving from the picocell to the macro network worked quite well as soon as I left the coverage area which was around 20 meters. I'd say there were only using a very low power output. In the opposite direction, however, the mobile lost coverage and had to perform a network search before the picocell was found. My test mobile revealed that the macro cell did not broadcast the parameters for reselecting into the picocell. Looks like it hasn't been configured correctly at the time I tried.

All in all, I was very impressed with the simplicity of the setup and not only the customers coming to the mall but also those that work there are probably quite happy to have the network there and are probably even unaware that their call is not handled by the macro network but is actually backhauled via a DSL IP connection.

Thanks for the visit, it was very insightful!