The present document defines the requirements for synchronization on the GSM radio sub-system. (However@ it does not define the synchronization algorithms to be used in the Base Transceiver Station (BTS) and Mobile Station (MS). These are up to the manufacturer to specify.)
TS 100 912-2000 history
2003TS 100 912-2003 Digital Cellular Telecommunications System (Phase 2+); Radio Subsystem Synchronization (3GPP TS 05.10 Version 8.11.0 Release 1999)
2002TS 100 912-2002 Digital Cellular Telecommunications System (Phase 2+); Radio Subsystem Synchronization (3GPP TS 05.10 Version 8.10.0 Release 1999)
2001TS 100 912-2001 Digital Cellular Telecommunications System (Phase 2+); Radio Subsystem Synchronization (3GPP TS 05.10 Version 8.8.0 Release 1999)
2000TS 100 912-2000 Digital Cellular Telecommunications System (Phase 2+); Radio Subsystem Syncronization (3GPP TS 05.10 Version 5.4.1 Release 1996)