PDTCH - What does PDTCH stand for? The Free Dictionary
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After the mobile has the parameters set for a data call, the network instructs it to go to a PDTCH where the data session is executed.
These bits of information initially are sent on the BCCH or PBCCH then transferred to the PACCH while the mobile is receiving data on a PDTCH. RR deals with the various resources needed to maintain the call.