his is an implementation of Packet Control Unit (PCU) according to TS 04.60

The PCU is part of BSS, so it connects directly to SGSN.

For this PCU the dependent libosmocore patch is in contrib which has to be
applied on top of libosmocore 2ae5f186929a720b5604e2bd19ef54606b37fb87.

This PCU enables
 * Support for EPDAN
 * Support for PUAN with CRBB

== Current limitations ==

 * No PFC support
 * No fixed allocation support
 * No extended dynamic allocation support
 * No unacknowledged mode operation
 * Only single slot assignment on uplink direction
 * No half-duplex class support (only semi-duplex)
 * No handover support
 * No measurement support
 * No TA loop
 * No power loop
 * No CS loop
 * No EGPRS