- This topic has 13 replies, 1 voice, and was last updated 12 years, 1 month ago by Pix.
2nd February 2009 at 18:28 #55592roopaGuest
How does a GPRS attached Mobile Station know whether a cell site is only GPRS or EDGE enabled ?? is it present in the System Information ???2nd February 2009 at 18:42 #55593PixGuest
Probably 🙂 And that should be in the 3GPP… but where ?? I’ll try to find it out tomorrow.11th February 2009 at 15:29 #55594roopaGuest
hey pix… got the answer???11th February 2009 at 19:59 #55595PixGuest
… i’m sorry, i’m very very busy…
have you try drilling into the 3GPP ?12th February 2009 at 08:41 #55596PixGuest
I got the answer:
The System Information 13 is modified:
broadcast of the fields EGPRS_PACKET_CHANNEL_REQUEST and BEP_PERIOD in SI13 message is done if cell is EGPRS capable.
So the MS knows beforehand if the cell is EGPRS or GPRS (or nothing, if there is no SI13).12th February 2009 at 11:26 #55597paraHOGuest
3GPP TS 046020th February 2009 at 16:31 #55598Alex RicheGuest
EGPRS_PACKET_CHANNEL_REQUEST is used by handset & not by the network.
What exactly does the network tell the MS??20th February 2009 at 18:37 #55599PixGuest
a SI message is broadcasted by the cell (the si13), and in this si, there is the field EGPRS PACKET CHANNEL REQUEST.
I’m not talking about the uplink channel request message.21st February 2009 at 14:59 #55600Alex RicheGuest
RAC, Network Control Order parameters, GPRS Power Control parameters, Options – NMO & Access burst type would be carried on SI 13 when PBCCH is not available.
I wonder where EGPRS PACKET CHANNEL REQUEST would be part of that. That is part of PSI1 message.21st February 2009 at 16:15 #55601PixGuest
well, it’s there… keep looking 🙂 i don’t think it’s an alcatel-lucent proprietary implementation, youshould be able to find the same thing in all vendors.26th February 2009 at 14:34 #55602Alex RicheGuest
It might sound strange! I could not find any piece of document until now which specifies that “EGPRS PACKET CHANNEL REQUEST” is part of down link. The name itself very much sounds like uplink! Spent some days on specs!26th February 2009 at 17:48 #55603PixGuest
you got to love specs now, don’t you?
a channel request is an uplink message, but it doesn’t mean that this name can’t be used as a field name in a downlink message 😉
I’m glad you spent time looking for it. Would you mind sharing in which spec you found it exactly ?27th February 2009 at 13:39 #55604Alex RicheGuest
0460-8l0 & 0408-7l0 predominantly & few other related docs!
am going nuts, but at the same time just loving the wonder called “GSM”. Man, am in love with it.27th February 2009 at 18:38 #55605PixGuest
GSM oozes brainiak stuff… you can feel people did really think it through, 15 years ago :))