After the Immediate assignment, what are you receiving from the MS ?
It is strange that the MS is acknowledging this message, or even sending blocks. It is supposed to be a DL TBF establishment…
On receipt of an Immediate Assignment message, the mobile station stops monitoring downlink CCCH and switches to the assigned PDCH and starts listening for downlink RLC/MAC blocks identified by the assigned DL TFI; it starts timer T3190.
Ok… so what you can check:
– are you sending the data blocks on the correct PDCH ?
– are you using the correct TFI ? TA ?
– is T3190 already expired in MS ?
– is your P.D.Assign in the good format ?
… what else ?