28 Jun
2012
28 Jun
'12
3:43 p.m.
Hi, Andreas!
I am not sure that I understand question.
I think, if downlink assignment got lost (no response from mobile to
polling of downlink acknowledgement), we should try to establish this TBF
again (repeat downlink assignment), after that we should transmit in
established TBF all LLC PDUs recieved from SGSN .
2012/6/28 jolly <andreas(a)eversberg.eu>
hi,
i try to unterstand downlink assignment. there are two ways to perform it:
- on AGCH/PAGCH when mobile is in packet idle mode
- on PACCH when mobile is in packet transfer mode (currently ongoing
uplink TBF)
(for establishment of uplink TBF in packet idle mode, the mobile repeats
channel requests after one second timeout.)
i don't see any procedure how the networks repeats a downlink
assignment, if there is no response from the mobile (if downlink
assignment got lost, hence it was not received by mobile). the only
logical procedure i can see is that the messages from SGSN will get
dropped during release of downlink TBF. (the release happens, because
there is no response from mobile to polling of downlink acknowledgements.)
regards,
andreas
--
Regards,
Ivan Kluchnikov.
http://fairwaves.ru