Base Station Controller - Base Tranceiver Station (BSC-BTS) Interface General Aspects
The present document is an introduction to the 08.5x - 08.6x series of 3GPP Technical Specifications and deals with the definition of the base station controller (BSC) to base transceiver station (BTS) interface defined inside the base station system (BSS) for the GSM system. These Technical Specifications define the basic interface with some identified options requiring further elaboration. The BSC-BTS interface is mandatory within GSM only if the BSC and the BTS are not colocated.