About the Author: Calin is a network engineer, with more than 8 years of experience in
designing, installing, troubleshooting, and maintaining large enterprise WAN and LAN networks. Currently he's Cisco (CCNA, CCNP, CCIP) and Linux (LPIC) certified and working to obtain CCIE certification.
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“2.5G provides some of the benefits of 3G (e.g. it is packet-switched) and can use some of the existing 2G infrastructure in GSM and CDMA networks. GPRS is a 2.5G technology used by GSM operators. Some protocols, such as EDGE for GSM and CDMA2000 1x-RTT for CDMA, can qualify as “3G” services (because they have a data rate of above 144 kbit/s), but are considered by most to be 2.5G services (or 2.75G which sounds even more sophisticated) because they are several times slower than “true” 3G services.” http://en.wikipedia.org/wiki/2.5G
I believe that based on this topic you can start a never ending discussion (e.g. Windows vs. Linux )
[...] the-difference-between-3g-and-4g Tags: International Telecommunication Union, UMB, wimax This entry was posted on Saturday, March 14th, 2009 at 16:36 and is filed under Internet, Mobil ell. Cell, Netværk, Telefoni, Trådløst internet. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site. [...]
The 3 G used in WCDMA
up to 5 Mhz as bandwhith whith only one frequency ( Indeed we have 2
one for Uplink sense and the other is for the Downlink one)
But the 3 g is
interferences and noise sensitive meaning lowering capacity si our system
is affected by noises
The 4 G on LTE uses several sub carriers for some reasons like a way to fight some selectve interfrences affecting some frequencies we can cancel temporarily in one hand and in oher other
we can also by serial to parallel change of the data before IFFT modulation to enlarge the duration of the symbol in order to prevent Intersymbol interferences
The subcarriers ’s choice is made deliberatly by time symbol as separation for the same goal
Really interesting, but I do not agree about EDGE being 3G.
From my knowledge GPRS is 2G and EDGE is 2.5G
Hi Liviu! I know the same but look here:
“2.5G provides some of the benefits of 3G (e.g. it is packet-switched) and can use some of the existing 2G infrastructure in GSM and CDMA networks. GPRS is a 2.5G technology used by GSM operators. Some protocols, such as EDGE for GSM and CDMA2000 1x-RTT for CDMA, can qualify as “3G” services (because they have a data rate of above 144 kbit/s), but are considered by most to be 2.5G services (or 2.75G which sounds even more sophisticated) because they are several times slower than “true” 3G services.”
http://en.wikipedia.org/wiki/2.5G
I believe that based on this topic you can start a never ending discussion (e.g. Windows vs. Linux
)
Thanks for comment!
[...] the-difference-between-3g-and-4g Tags: International Telecommunication Union, UMB, wimax This entry was posted on Saturday, March 14th, 2009 at 16:36 and is filed under Internet, Mobil ell. Cell, Netværk, Telefoni, Trådløst internet. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site. [...]
this is jack
Man, I will watch anything Craig Mathias puts out…super helpful.
thanks!
Disagree about EDGE.
2.5 G GPRS
2.75 EDGE
3G UMTS
3.5G HSPA
3.75G IMS
4G LTE
Super helpful ! thanks Craig
What is the reason for delay in implementing 3G and 4G Mobile services?
A nice overview of the mobile generations (from 1st to 4th):
http://www.nil.com/ipcorner/FirstMileWireless/
In my opinon the big difference is as follows:
The 3 G used in WCDMA
up to 5 Mhz as bandwhith whith only one frequency ( Indeed we have 2
one for Uplink sense and the other is for the Downlink one)
But the 3 g is
interferences and noise sensitive meaning lowering capacity si our system
is affected by noises
The 4 G on LTE uses several sub carriers for some reasons like a way to fight some selectve interfrences affecting some frequencies we can cancel temporarily in one hand and in oher other
we can also by serial to parallel change of the data before IFFT modulation to enlarge the duration of the symbol in order to prevent Intersymbol interferences
The subcarriers ’s choice is made deliberatly by time symbol as separation for the same goal
THANKYOU GOOGLE VERY GOOD EXPELING ABOUT 3G/4G