The use and general aspects of the BSC to BTS interface (the A-bis interface) are given in Recommendation TS 08.51
. This recommendation specifies the general structure of layer 3 and traffic management procedures and messages used on the A-bis interface to support signalling procedures as defined in Recommendation TS 04.08
. Network management procedures and messages for the A-bis interface are defined in Recommendation TS 08.59
. The functional split between BSC and BTS is defined in recommendation TS 08.52
. The procedures and messages required to support this split are defined in detail in this recommendation.
This delta recommendation only includes modified part concerning specifically the DCS 1800 short term solution (phase 1).