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GSM TS 48.001 |
geran2 |
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BSS-MSC interface - General aspects |
The present document is an introduction to the TS 48.0xx series of Technical Specifications and deals with the definition of the base station system (BSS) to mobile switching centre (MSC) (referred to as the A-interface) defined for the GSM system.
It also introduces Technical Specifications in the TS 48.020 series, dealing with the support of data services on this interface.
The present document gives an overview of the content of the TS 48.0xx and TS 48.020 series of Technical Specifications explaining how the detailed content of the Technical Specifications is partitioned and how the Technical Specifications can be used to support a full BSS-MSC interface.
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GSM TS 48.002 |
geran2 |
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BSS-MSC interface - Interface principles |
The present document gives the principles on which the detailed interface specifications in the rest of the TS 48.0xx series of Technical Specifications are based.
The set of fixed equipment accessed from the MSC through one particular instance of the interface will be later referred to as a Base Station System (BSS). A BSS ensures the coverage of n cells, where n can be 1 or more.
The function of a BSS may be further subdivided into a control function, performed by one Base Station Controller (BSC) and a transceiving function, performed by "n" Base Transceiver Station equipments (BTS), one for each cell. However, the study of such a split is outside the scope of the 48.0xx series of Technical Specifications, where the BSS will be considered as a whole.
The BSS-MSC interface defined in the TS 48 series of Technical Specifications is designed to support a wide range of possible architectures on both sides. Characteristics like location of the transcoders/rate adaptation to the MSS or inside the BSS (either physically integrated into the transceivers or very near to the MSC) or the use of traffic or signalling concentration at either side are left to the operators' choice. Annex A to the present document contains guidance information concerning the use of remote mobile switching units, which for the purposes of the present document are considered as part of the MSC.
The BSS-MSC interface is commonly called "A-Interface". It is subdivided into the Control Plane (signalling) and the User Plane (traffic). Throughout this document the term "MSC" is used to reflect both planes of the Mobile Core Network, although in some architecture the Mobile Core Network is split into MSC-Server (MSC-S) and Media Gateway (MGW).
Direct connection between two BSSs is not supported by this A-Interface.
This A-Interface may be based on
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TDM using 1 or more 2048 kbit/s digital transmission system interfaces. Each 2048 kbit/s interface provides 31*64 kbit/s channels which can be used for traffic (User Plane) or signalling (Control Plane) as the operator requires, and/or
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IP supporting User Plane and/or Control Plane (SIGTRAN).The signalling is layered, terminology similar to that in the OSI reference model is used in this series, however the layers referred to are not identical to the equivalently named layer in the OSI model.
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This A-Interface User Plane is defined at the boundary of the MSC and
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in case of TDM, it has a per channel bit rate of 64 kbit/s, but the net radio path traffic channel is at a rate of less than 16 kbit/s. A speech transcoder or data rate adapter function is thus needed for the rate conversion. The interface is designed such that the transcoding or rate adaptation function may be geographically situated at either the MSC site or the BSS site, however the transcoder is considered to be part of the BSS
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in case of IP, it has a flexible channel bit rate, adapted to the payload size. The speech transcoding function can be part of either the BSS or the Core Network or can be omitted (transcoding free operation), allowing e.g. for use of both, PCM encoded speech and compressed speech, over the A-Interface. The data rate adapter function is always located inside the BSS, using a 64kbit/s unrestricted digital interface (Clearmode) over IP.
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The A-Interface has been designed around the aims of TS 48.001 allowing each component and the system as a whole to evolve.
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GSM TS 48.004 |
geran2 |
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BSS-MSC interface - Layer 1 specification |
The present document defines the structure of the physical layer (layer 1) of the BSS-MSC interface for supporting traffic channels. Use of the physical layer for supporting Signalling System No.7 signalling links is covered in Technical Specification TS 48.006.
The physical layer is the lowest layer in the OSI Reference Model and it supports all functions required for transmission of bit streams on the physical medium.
For the present document only digital transmission will be considered, the use of analogue transmission is a national concern.
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GSM TS 48.006 |
geran2 |
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Signalling transport mechanism Specification for the BSS-MSC interface |
The present document is split into four parts, clauses 4 to 6 dealing with the MTP, clause 6a dealing with M3UA/SCTP, clause 7 dealing with interface functions towards higher layers and clauses 8 to 10 dealing with the SCCP and its use.
The MTP provides a mechanism giving reliable transfer of signalling messages. Clauses 4 to 7 of the present document deal with the subset of the MTP that can be used between an BSS and an MSC, which is compatible with a full MTP.
The M3UA/SCTP provides a mechanism giving reliable transfer of signalling messages over an IP network.
The SCCP is used to provide a referencing mechanism to identify a particular transaction relating to for instance a particular call. Clauses 8 to 10 identify the SCCP subset that should be used between a BSS and an MSC. The SCCP can also be used to enhance the message routing for (for instance) operations and maintenance information.
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GSM TS 48.008 |
geran2 |
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Mobile Switching Centre - Base Station system (MSC-BSS) interface - Layer 3 specification |
The present document specifies the layer 3 procedures used on the Base Station System (BSS) to Mobile-services Switching Centre (MSC) interface for control of GSM services.
For the purposes of call control and mobility management, messages are not interpreted at the Base Station System (BSS) which acts as a relay function. These messages and procedures are documented in 3GPP TS 24.008, the only relevant issues covering these messages in the present document are those concerned with error conditions at the interface, and the headers that are required for the correct addressing of the messages. This is specified in more detail in TS 48.002.
The functional split between MSC and BSS is defined in TS 48.002 and states that the BSS is responsible for local radio resource allocation and in order to support this the required procedures between BSS and MSC are defined in detail in the present document.
TS 48.002 also states that the BSS is responsible for the scheduling of all CCCH/BCCH messages and therefore some procedures for providing the BSS with the necessary information to be passed on these channels for individual calls (i.e. paging) are defined in the present document, but the scheduling is not discussed.
This interface and consequently these layer 3 procedures are designed to support BSSs providing one or more cells.
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GSM TS 48.016 |
geran2 |
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GPRS - BSS-SGSN interface - Network service |
The present document specifies the Network Service used on the Base Station System (BSS) to Serving GPRS Support Node (SGSN) interface (Gb interface).
The protocol stack on the Gb interface is defined in the stage 2 Technical Specification TS 43.060.
The Network Service entity provides network services to the BSSGP entity specified in TS 48.018.
The layer 1 of the Gb interface is specified in TS 48.014.
In the present document, the communication between adjacent layers and the services provided by the layers are distributed by use of abstract service primitives. But only externally observable behaviour resulting from the description is normatively prescribed by the present document.
The service primitive model used in the present document is based on the concepts developed in ITU-T Recommendation X.200.
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GSM TS 48.018 |
geran2 |
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GPRS - BSS-SGSN - BSS GPRS protocol (BSSGP) |
The present document specifies or references procedures used on the Base Station System (BSS) to Serving GPRS Support Node (SGSN) interface for control of GSM packet data services.
The functional split between BSS and SGSN is defined in 3GPP TS 23.060 which states that a BSS is responsible for local radio resource allocation. The required procedures between BSS and SGSN are defined in detail in the present document.
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GSM TS 48.020 |
ct3 |
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Rate adaption on the BSS-MSC interface |
The present document defines rate adaptation functions to be used in PLMN Base Station Systems (BSS) transcoders and IWF
The number of Base Station System - Mobile-services Switching Centre (BSS - MSC) traffic channels supporting data rate adaptation may be limited. In this case some channels may not support data rate adaptation. Those that do, shall conform to this specification.
NOTE: This specification should be considered together with TS 44.021 to give a complete description of PLMN rate adaptation.
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GSM TS 48.031 |
geran2 |
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LCS - SMLC-SMLC - SMLCPP specification |
The present document contains the definition of the SMLCPP protocol to be used between two Serving Mobile Location Centres (SMLC).
The LCS architecture is described in TS 43.059. The following aspects of it are relevant to the issue:
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each SMLC controls a number of LMUs, and a given LMU is under the direct control of a single SMLC;
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there is a direct communication path, independent of SMLCPP, between a LMU and the SMLC that controls it;
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deciphering keys are controlled by one SMLC in the location area and sent to other SMLCs in the same location area.
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SMLCPP runs between two SMLC functions in the same PLMN. Transport is outside the scope of the present document. It assumes a transport service between these functions, as provided by BSSAP-LE. The present document assumes that the underlying transport (e.g., as described by BSSAP-LE specifications) provides for transport and routing for any two pairs of SMLCs which need to run SMLCPP exchanges.
The main functions of SMLCPP are described in TS 43.059. The key aspects are:
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allowing an SMLC to ask for and obtain information about Radio Interface Timing (RIT), as known from measurements done by LMUs not under its direct control;
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allowing an SMLC, that controls deciphering keys in the location area, to sent them to other SMLCs in the same location area.
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GSM TS 48.051 |
geran2 |
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BSC-BTS interface - General aspects |
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The present document is an introduction to the 48.5xx - 48.6xx 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.
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GSM TS 48.052 |
geran2 |
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BSC-BTS interface - Interface principles |
The use and general aspects of the A-bis interface are given in TS 48.051.
The present document gives the principle basis for the rest of the specifications specifying the interface between the Base Station Controller, BSC, and the Base Transceiver Station, BTS, with its transceivers, TRX. These components together form the Base Station System, BSS. (The interface between MSC and the BSS is specified in TS 48.001 and TS 48.020).
The intention with this interface is to get a unified way of connecting remotely located BTSs/TRXs to a BSC allowing for the interconnection of BSCs and BTSs/TRXs from different manufacturers.
In order to keep the BTS as simple as possible, BTS contains only those functions which have to recide close to the radio interface.
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GSM TS 48.054 |
geran2 |
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BSC-BTS interface - Layer 1 structure of physical circuits |
The use and general aspects of the A-bis interface are given in TS 48.051.
The present document defines the structure of the physical layer (layer 1) of the BSC - BTS/TRX interface for supporting traffic channels and control channels. Use of the physical layer for supporting link protocol is covered in TS 48.056.
The physical layer is the lowest layer in the OSI Reference Model and it supports all functions required for transmission of bit streams on the physical medium.
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GSM TS 48.056 |
geran2 |
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BSC-BTS interface - Layer 2 specification |
The present document specifies the link layer used for signalling on the A-bis interface between BSC and BTS. The use and general aspects of the A-bis interface are described in TS 48.051 and the interface aspects in TS 48.052.
The Link Access Procedure on the D-channel (LAPD) specification used on the A-bis interface in the GSM PLMN is a subset of the EN 300 125 which in turn has less options than the CCITT Recommendation Q.921.
This description contains first the protocol definitions and second the services provided by the layer 2 to the layer 3.
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GSM TS 48.058 |
geran2 |
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BSC-BTS Interface - Layer 3 Specification |
The present document 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 3GPP TS 24.008 and TS 44.018. Support for Location Services (LCS) related signalling, as defined in 3GPP TS 23.071, is also included. 3GPP TS 23.071 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 the present document.
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 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 the present document.
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GSM TS 48.060 |
geran1 |
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In-band control of remote transcoders and rate adaptors for full rate traffic channels |
When 64 kbit/s traffic channels are used on the A-bis interface, the speech shall be coded according to CCITT Recommendation G.711 and the data rate adaptation shall be as specified in TS 44.021 and TS 48.020.
In the case where 16 kbit/s traffic channels are used for full rate speech, enhanced full rate speech, Adaptive Multi-Rate speech, Adaptive Multi-Rate Wideband speech or full rate data service, then the present document shall apply for frame structure and for control of remote transcoders and additional rate adaptors.
For Adaptive Multi-Rate speech the present document specifies the 16 kBit/s submultiplexing, both for the full and the half rate traffic channels (TCH/AFS, TCH/AHS, TCH/WFS and O-TCH/WHS). The specification for 8 kBit/s submultiplexing is given in TS 48.061, both for the full and the half rate traffic channels (TCH/AFS and TCH/AHS).
Additionally, the present document specifies the 32 kBit/s submultiplexing for Adaptive Multi-Rate Wideband speech. However it reuses the frame structure of the 16 kBit/s submultiplexing for Adaptive Multi-Rate speech.
The use and general aspects of the A-bis interface are given in TS 48.051.
NOTE: The present document should be considered together with the GSM TS 06 series of specifications, TS 44.021 (Rate Adaptation on the MS-BSS Interface) and TS 48.020 (Rate Adaptation on the BS/MSC Interface).
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GSM TS 48.061 |
geran1 |
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In-band control of remote transcoders and rate adaptors for half rate traffic channels |
The present document describes the protocol between the Base Transceiver Station (BTS) and the remote Transcoder/Rate Adaption Unit (TRAU) for speech and data on half rate traffic channel (TCH/H).
For Half Rate speech and half rate data the protocol is specified for 8 kbit/s and 16 kbit/s submultiplexing scheme.
For Adaptive Multi-Rate speech the present document specifies the 8 kBit/s submultiplexing, both for the full and the half rate traffic channels (TCH/AFS and TCH/AHS). The specification for 16 kBit/s submultiplexing is given in Rec TS 48.060, both for the full and the half rate traffic channels (TCH/AFS and TCH/AHS).
The present document should be considered together with the TS 46 series, TS 44.021 (Rate Adaption on the MS BSS Interface) and TS 48.020 (Rate Adaption on the BTS/MSC Interface).
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GSM TS 48.071 |
geran2 |
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LCS - SMLC-BSS interface - Layer 3 specification |
The present document contains the coding of information necessary for support of location service operation on the SMLC-BSS interface layer 3.
Clause 2 gives the functional definitions and contents of messages for location service operations. Clause 3 gives the general format and coding for messages used for location service and the format and coding of information elements used for location service operations.
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GSM TS 48.103 |
geran2 |
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BSS-MGW interface - User plane transport mechanism |
The present chapter describes the transport on the A Interface UP over E1/T1 interface; for more information see TS 48.001.
Layer 1 shall utilise digital transmission:
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at a rate of 2048 kbit/s with a frame structure of 32 x 64kbit/s time slots, as specified in ITU-T
Recommendation G.705 clause 3 for E1 interface; or
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at a rate of 1 544 kbit/s with a frame structure of 24 x 64 kbit/s time slots, as specified in T1.102 specification for
T1 interface.
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The payload is either PCM encoded speech (see ITU-T Recommendation G.711) or CSData (see TS 48.020).
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