- This topic has 8 replies, 1 voice, and was last updated 16 years, 9 months ago by Da Architect.
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17th July 2007 at 12:56 #48228rf fanGuest
Hi all,
I have folowing problem: GPRS users often recieve timeout after start downoading. Radio conditions are good, TEMS shows “T3168 Expired Packet Assignment Timeout”. There is a timeslot reserved for data and cell haven’t congestion problems …..
Any advices ?Thanks !
17th July 2007 at 19:14 #48229PixGuestwhat is the definition and the use of the T3168 ? have you found out in the 3GPP ? (i don’t feel like looking for it by myself 🙂 )
18th July 2007 at 08:05 #48230rf fanGuestOf cource I check it:)
T3168 is used on the mobile station side to define when to stop waiting for a Packet Uplink Assignment message after sending of a Packet Resource request message. It is set to 2.5 that means 2s. In all other cells with same value, GPRS work correctly. Any advices ?
19th July 2007 at 07:14 #48231raviGuesthi pix
I have a gprs enabled Airtel SIM . When I am in roaming and try to connect to the internet , I get a msg :- Packet data not active , but GPRS is enabled in that area.
What could be the reason ?
When I come back to my home state , the gprs starts working automatically ?19th July 2007 at 11:31 #48232PixGuestRf Fan,
Well, in this case… What do you think about this : the MS sends the request in order to keep the connection “alive” longer, but it doesn’t actually expect an answer. This is a trick used to speed up the GPRS reactivity…
Of course if it happens only in this cell, it is a bit weird. I think i would start by check the UL TBF establishment failure in the QoS Stats, that would certainly give a lead. Other than that, I don’t really see what could be the problem…
If there’s nothing on the QoS stats, then it is certainly not impacting the users… and if there is a problem, then you can certainly check the causes of the failures with some more detailed stats. Check also the GSM stats, if there is a radio problem in the cell.
Let me know if you find anything..
19th July 2007 at 11:32 #48233PixGuestAnd before all, don’t hesitate to do a SW reset of the cell (GSM + GPRS). Surprisingly good results sometimes :))
20th July 2007 at 10:10 #48234Da ArchitectGuestDear rf fan,
Re-initialization of PDCH timeslots in the problamatic cell would help also.
22nd July 2007 at 11:57 #48235rf fanGuest10X for answers,
there isn’t anyting suspiciously in stats, exept “Data drop (connections, non released normaly)” .It is 11 percent per day, but this is rural cell that has a bit low data traffic and this counter isn’t so accurate.
Tommorow i’ll check detailed stats and re-initialization of PDCH timeslots ……
We done SW reset, but it didn’t help 🙂24th July 2007 at 10:34 #48236Da ArchitectGuestDear rf fan,
some cells become GPRS sleeping, and you can notice this when
GPRS_UL_TBF_estab_fail_radio_rate is high while GPRS_UL_TBF_request is small, therefore initialization of PDCH TS is recommended to wake up these cells. -
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