Implementation of SI 13 message and rest octets for SI 3 message which are using for GPRS.
TDMA Mapping for GPRS channels.
Channel combinations for GPRS.
Representation of a GPRS RLC/MAC block in a bit vector.
PDTCH logical channel for GPRS.
GPRS L1 interface for communication between PCU and OpenBTS.
Implementation of gprs coding schemes 1,2,3,4 for PDTCH channel.
umtrx: set timing offset and clocking frequency

Measured offset and set to zero based on Nokia 3120 handset.

Signed-off-by: Thomas Tsou <tom@tsou.cc>
Handover implementation.