This TS 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 TS 24.008
and TS 44.018
. Support for Location Services (LCS) related signalling, as defined in TS 23.271
, is also included. TS 23.271
identifies new A-bis signalling to support BTS-embedded Type B LMUs as well as standalone, Type B LMUs. The standalone Type B LMU supports the layer 1 and 2 signalling for the A-bis as well as the Location Service message defined in this TS.
The use and general aspects of the Base Station Controller (BSC) to Base Station Transceiver (BTS) interface (the A-bis interface) are given in TS 48.051
Network management procedures and messages for the A-bis interface are defined in GSM TS 08.59
The functional split between BSC and BTS is defined in TS 48.052
. The procedures and messages required to support this split are defined in detail in this TS.