08.513GPPBase Station Controller - Base Tranceiver Station (BSC-BTS) Interface General AspectsTS
The full structure of the Technical Specifications specifying the BSC to BTS interface are as follows:
5.1 Technical Specification 3GPP TS 08.52 BSC-BTS Interface Principles
The present document gives the principle basis for the rest of the specifications specifying the interface between the base station controller and the base transceiver station. It gives the functional split between these two entities.
5.2 Technical Specification 3GPP TS 08.54 BSC-BTS Layer 1 Specification
The present document defines the structure of the physical layer at the BSC – BTS interface. The physical interface is either chosen as 2048 kbit/sec or as 64 kbit/sec, both according to standard CCITT recommendations.
Depending on location of transcoders, speech is standard A-law or it is 16 kbit/sec remote control protocol multiplexed or rate adapted to 64 kbit/sec in the same way as data.
5.3 Technical Specification 3GPP TS 08.56 BSC-BTS Layer 2 Specification
At layer 2 the signalling information is passed by a standard LAPD protocol mechanism in accordance with the CCITT Recommendations Q.920 and Q.921.
5.4 Technical Specification 3GPP TS 08.58 BSC-BTS Layer 3 Specification
The present document specifies the layer 3 procedures used on the BSC-BTS interface for control of the GSM services. The functional split between BSC and BTS is defined in Technical Specification 3GPP TS 08.52.
5.5 Technical Specification 3GPP TS 12.21 BSC-BTS Operation/Maintenance Signalling
The present document defines the transport mechanism for O&M messages over the Abis interface. O&M procedures and messages are defined in 3GPP TS 12 series.
5.6 Technical Specification 3GPP TS 08.60 Inband Control of Remote Transcoders and Rate Adaptors
The transcoder is a part of the BSS and may optionally be located outside the BTS (e.g. at MSC-site or at BSC-site) in order to make it possible to multiplex speech and data channels on the links within the BSS and on the BSC-BTS link.
The present document describes the protocol which carries the full rate speech and data frames between the transcoder and the radio link codec across a 16 kbit/sec interface. Both full rate speech and full rate data services are covered. It also defines the signals needed for remote controlling the timing of the transcoder in accordance to the transmission time at the radio link. It also addresses the signals for voice activity and comfort noise. It interfaces the 06- series to the 05-series.
5.7 Technical Specification 3GPP TS 08.61 Inband Control of Remote Transcoders and Rate Adaptors for Half Rate Traffic Channels
This Technical Specification describes the protocol which carries the half rate speech and data frames between the transcoder and the radio link codec across a 16 kbit/sec or an 8 kbit/sec interface. Both half rate speech and half rate data services are covered. It also defines the signals needed for remote controlling the timing of the transcoder in accordance to the transmission time at the radio link. It also addresses the signals for voice activity and comfort noise.
Annex A (informative):
Version for Release 99
Update to 3GPP TS style. Editorial corrections to reference clause. IPR clause removed.