What is GPRS+

[Neo]

MTNBroadband,

Can you please explain the difference between GPRS and GPRS+ ?

Is it, as I suspect, just different coding schemes? I'm assuming MTN GPRS is cs1 and cs2, while GPRS+ is cs3 and cs4?

Can you also confirm what coding schemes you'll be using on EDGE? Will it be higher than cs5?

 

[ScrnScrm]

I can answer that for you.
GPRS uses GMSK modulation. EDGE uses 8-PSK/GMSK Modulation.
The difference between GPRS and GPRS+ is the Coding scheme used - GPRS Plus uses CS4, which allows a user data rate of 20Kbs per channel. EDGE has been implemented using MCS9 coding scheme on 8-SPK/GMSK modulation, which allows a user data rate of 59.2Kbs per channel. Four channels X 59.2 = 236.8Kbs max throughput on EDGE as it stands now.

cheers -

 

[MTNBroadband]

MTNBroadband,

Can you please explain the difference between GPRS and GPRS+ ?

Is it, as I suspect, just different coding schemes? I'm assuming MTN GPRS is cs1 and cs2, while GPRS+ is cs3 and cs4?

Can you also confirm what coding schemes you'll be using on EDGE? Will it be higher than cs5?

Hi. You are correct that GPRS+ is coding schemes 3 and 4 which is why 98% of available GPRS handsets already support this and ScrnScrm has given the detail. Some handsets support four 'timeslots' for download so can now handle 4 x 20 kbps = 80 kbps instead of the previous limit of 4 x 12 = 48 kbps. Other handsets support two or three timeslots.

EDGE has 8 coding schemes and they are all supported by MTN. These are a different family of coding schemes from GPRS and EDGE also has other features aiming at a more robust connection and generally faster data throughputs under the same radio conditions as a comparable GPRS connection.

As a rule take off 5-10% off the nominal radio speed of any of these technologies to get a more realistic maximum user experience because of protocol overheads.

 

[ScrnScrm]

...EDGE has 8 coding schemes and they are all supported by MTN....

...As a rule take off 5-10% off the nominal radio speed of any of these technologies to get a more realistic maximum user experience because of protocol overheads....

eh, mtnbb- to correct some of your above statements.

EDGE has 9 coding schemes (listed here in Kilo bits per second per channel) :

MCS1 = 8.4
MCS2 = 11.2
MCS3 = 14.8
MCS4 = 17.6
MCS5 = 22.4
MCS6 = 29.6
MCS7 = 44.8
MCS8 = 54.4
MCS9 = 59.2

MCS1 to MCS 4 use GMSK (same coding scheme as GPRS) and MCS5 to MCS9 use 8PSK modulation.

The above quoted speeds are NOT nominal radio speeds, so you do not have to substract transmission overhead. For example, the Radio data rate per timeslot for MCS9 is actually 69.2kb/s.

As a side note - i am not trying to shoot you down or anything like that - your presence is MUCH appreciated on this forum!!!!!!!! (hopefully people will stop PMing me about EDGE now!)
I just want to make sure that the right information is posted here, so think of me as your auditor

Later -

 

[unspokenchaos]

http://en.wikipedia.org/wiki/GPRS

interesting read