he PCCCH are optional in GPRS and currently not implemented by OsmoPCU. This means that we cannot use 11bit RACH bursts, which would be useful for later EGPRS support.
Without PCCCH, there is no PRACH, and without PRACH, there is no multi-slot EGPRS TBF assignment in single-phase access.
3GPP TS 44.060 already in Release 10:
1.6 Restrictions Independently of what is stated elsewhere in this and other 3GPP specifications, mobile station support for PBCCH, PCCCH and PACKET PSI STATUS is optional for A/Gb-mode of operation. The network shall never enable PBCCHand PCCCH.