Originally Posted by merdhead
What's with the 3.9G? I think fractional generations are pretty stupid (what's the generation between your mother and your grandmother?), but it's pretty clear that new air interfaces mark generations and LTE uses a different one to UMTS, hence it's 4G. What exactly are you waiting for in 4G?
Originally Posted by trowa
4G is LTE (Long Term Evolution). 4G requires new hardware and software upgrades on the towers. At least for the US (Verizon and AT&T), 4G will run on the 700 MHz band. This will allow deeper penetration into buildings and areas where the 800 MHz band couldn't reach.
Speeds can go from 326 Mbit/s dl and 86 Mbit/s. It offers increased spectrum flexibility in allowing faster rollouts from WCDMA and can hold more users per cell.
I at first didn't label LTE/HSOPA "4G" because although many use that label, many other times LTE/HSOPA routinely gets referred to as "pre-4G" or "post-3G", or that HSOPA is a "transitionary technology towards 4G", etc. Also, HSOPA is nicknamed "Super 3G". "3.9G" is what Japan is calling their upcoming LTE/HSOPA network to launch in 2010. I guess it's just confusing because of the abstract umbrella terms being used. But I will change it anyway.
Here is a good quote from 3GAmericas.org about this:
"Since 2006, significant progress has been made by the Radiocommunication Sector of the International Telecommunication Union (ITU-R) in establishing an agreed and globally accepted definition of ‘4G’ wireless systems, and in 2008, the ITU-R is expected to release a full set of documentation for this definition. At that time the vision will be translated into a set of requirements by which technologies and systems can, in the near future, be determined a part of IMT-Advanced and in doing so, earn the credible right to be considered 4G.
Thus, any claim that a particular technology is a so-called ‘4G technology’ prior to that definition is in reality simply a marketing spin, creating market confusion and deflating the importance of the telecommunications industry standards. Technologies should be verified against a set of agreed-upon requirements in order to qualify as ‘4G’, and this will happen in the future when the requirements are outlined by the ITU. Only then will it be understood what is, and can be rightly and credibly called, 4G. "
Originally Posted by bareform
Very nice chart! Cleared a big deal of the terminology for me and I guess most people here!
Originally Posted by Maury Markowitz
Winterspan, would you consider "donating" this chart to the wikipedia? Or more accurately, the wiki commons? I think it would dramatically improve a couple of articles on that site. Maury
Originally Posted by solipsism
Good idea! If you [winterspan] do, also upload the Excel file so it can be updated easily.
Hey, thanks guys. I would love to. I don't have time to HTML it for wikipedia right now, but maybe this week -- unless someone else would like to do it
I am also going to expand it to include all mobile phone technology, like older standards and the CDMA/3GPP2 track as well.Here is a link to the excel file
. its on a stupid file hosting server, so you have to click "free download" on the page.
Anyways, here is the final updated pic. There are a few changes made from the first one:
Originally Posted by Splinemodel
No, that's the aggregate data throughput of a single channel. I seem to remember that channel bandwidth for WCDMA is 5MHz. cells tend to operate on multiple channels. As more users enter a cell, the channels get overloaded. This is where the CDMA comes in. So actual data throughput depends on how many users are sharing a channel, and how much of it they are using. A lot of technology goes into load-balancing cell channels.
That sounds right... 14.4mbps is NOT the aggregate bandwidth for the whole cell. But of course everyone should definitely take ALL max speeds with a grain of salt. I don't know the details of it, but I do know that there are 15 HSDPA channels in every 5mhz of bandwidth.. I need to look at it closer. Anyways, bottom line is the faster the theoretical speed, the faster the real-world practical throughput SHOULD be, right? so it's always better to have faster and more advanced technology.
Also, btw, the move from UTMS/384 to ANY form of HSDPA (and HSUPA) is great not just because of the increased throughput, but because of the massively reduced latency on the connection. HSDPA return latencies are around 70-100ms versus 3-5x that or more from UMTS. And then when you add HSUPA on the uplink side, the whole round trip becomes almost similar to a home broadband connection. This will be imporant for multi-player games, VOIP, video chat, etc.
By the way, for you or anyone else who wants more info, here are some good sources I found (besides Wiki of course):
GSM/UMTS Technology Center
"EDGE, HSPA, LTE: The Mobile Broadband Advantage"
"Mobile Broadband: The Global Evolution of UMTS/HSPA - 3GPP Release 7 and Beyond" by 3G Americas