1 Framework for defining Bearer Services

02.023GPPBearer Services (BS) Supported by a GSM Public Land Mobile Network (PLMN)TS

Bearer Services are described by attributes, which are intended to be independent. These attributes are described and defined in GSM 02.01 [2]. They are grouped into four categories:

i) Information transfer attributes, which characterize the network capabilities for transferring information from a user access point in a GSM PLMN to a user access point in another network. (Refer to GSM 02.01 [2] and GSM 04.02 [5] for definitions of user access points, originating and terminating networks).

ii) Access attributes, which describe the means for accessing network functions or facilities as seen at the access point in the PLMN (see GSM 02.01 [2]).

iii) Interworking attributes, which describe properties of the terminating network and its access point. The terminating network may include another GSM PLMN or the originating PLMN (see GSM 02.01 [2]).

iv) General attributes, which deal with the service in general.

Figure 1 shows the relation between the groups of attributes and their fields of applicability.

NOTE 1: A transit network may not exist for a Bearer Service.

NOTE 2: Communication may be established from either end.

NOTE 3: The information transfer and access attributes of a Bearer Service relate to a direct peer-to-peer communication of:

– TE to TE;

– TE to a network gateway (supporting, for example, PSTN interworking); or

– network gateway to a TE.

Figure 1: Relation between the groups of attributes and fields of applicability

The following table lists the individual attributes in each of the four groups. The GSM Bearer Service definitions in the present document are based on the "Minimal Set" of attributes.

Table 1: List of Bearer Service attributes

Minimal

Set

Information Transfer Attributes

Information Transfer Mode

X

Information Transfer Rate

X

Information Transfer Capability

X

Establishment of Communication

X

Symmetry

X

Communication Configuration

X

Data Compression

Access Attributes

Access Channel and Rate

Signalling Access Protocols

Information Access Protocols

Information Access Structure

X

Information Access Rate

X

Interworking Attributes

General Attributes

Supplementary Services Provided

Quality of Service

X

Operational and Commercial

Attributes that are not part of the minimal set provide further technical detail and are required to fully define the use of each Bearer Service.

General Packet Radio Service (GPRS) is specified in GSM 02.60 [19].

See the GSM 07-series specifications [6], [7], [8], [9], [20] for information about the Signalling Access Protocols, Information Access Protocols and related access attributes.

GSM supplementary services are defined in GSM 02.04 [3].

Intercommunication is required with services in the PSTN, ISDN, CSPDN, PDN, PSPDN and other PLMNs. The capabilities that describe the Interworking Attributes are described in GSM 03.10 [4] and the GSM 09‑series specifications [10] to [15] and [21].