3 Bearer Services

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

This clause provides a list of the existing GSM Bearer Services and indicates the values for each attribute in the minimal set.

The following attributes have the same value for all GSM Bearer Services. Their values are as follows:

Information Transfer Mode: "Circuit" (note 1);

Information Transfer Rate: Not applicable (note 2);

Establishment of Communication: "Demand";

Symmetry: "Bi-directional Symmetric" (note 3);

Communication Configuration: "Point to point".

NOTE 1: GPRS (BS 70) requires "packet" information transfer mode.

NOTE 2: The Information Transfer Rate attribute is not applicable because it depends on the reference point assumed in the GSM PLMN, transit or terminating network.

NOTE 3: Asynchronous services using 1 200/75 bps. and GPRS (BS 70) require a value of "Bi-directional Asymmetric".

All GSM asynchronous NT Bearer Services may support data compression to enhance user data throughput.

GSM NT Bearer Services 2x and 3x may support V.120 interworking, enabling data terminals connected to an MS to interwork with V.120 [18] terminal adapters on the ISDN as shown in the figure 2 below.

Figure 2: Model of GSM V.120 Interworking

Table 2 contains the list of the Bearer Services and the values for the remaining attributes in the minimal set.

Table 2

Bearer Service Number

Bearer Service Name

Access Structure

Access Rate

Information Transfer Capability

QOS Attribute

Notes

20

Asynchronous General Bearer Service

Asynch

note 7

note 7

note 7

See note 6

21

Asynchronous

300 bps

Asynch

300 bps

UDI or 3.1Khz

T or NT

22

Asynchronous

1.2 kbps

Asynch

1.2 kpbs

UDI or 3.1kHz

T or NT

23

Asynchronous

1200/75 bps

Asynch

1 200/75 bps

UDI or 3.1kHz

T or NT

See note 4

24

Asynchronous

2.4 kbps

Asynch

2.4 kbps

UDI or 3.1kHz

T or NT

25

Asynchronous

4.8 kbps

Asynch

4.8 kbps

UDI or 3.1kHz

T or NT

26

Asynchronous

9.6 kbps

Asynch

9.6 kbps

UDI or 3.1kHz

T or NT

30

Synchronous General Bearer Service

Synch

note 7

note 7

note 7

See notes 1 and 6

31

Synchronous

1.2 kbps

Synch

1.2 kbps

UDI or 3.1kHz

T

32

Synchronous

2.4 kbps

Synch

2.4 kbps

UDI or 3.1kHz

T or NT

See note 1

33

Synchronous

4.8 kbps

Synch

4.8 kbps

UDI or 3.1kHz

T or NT

See note 1

34

Synchronous

9.6 kbps

Synch

9.6 kbps

UDI or 3.1kHz

T or NT

See note 1

40

General PAD Access Bearer Service

Asynch

note 7

note 7

note 7

See notes 2,4, 5 and 6

41

PAD Access

300 bps

Asynch

300 bps

UDI

T or NT

See note 2

See note 5

42

PAD Access

1.2 kbps

Asynch

1.2 kpbs

UDI

T or NT

See note 2

See note 5

43

PAD Access

1 200/75 bps

Asynch

1200/75 bps

UDI

T or NT

See note 2

See note 4

See note 5

44

PAD Access

2.4 kbps

Asynch

2.4 kbps

UDI

T or NT

See note 2

See note 5

45

PAD Access

4.8 kbps

Asynch

4.8 kbps

UDI

T or NT

See note 2

See note 5

46

PAD Access

9.6 kbps

Asynch

9.6 kbps

UDI

T or NT

See note 2

See note 5

50

General Packet Access Bearer Service

Synch

note 7

note 7

note 7

See notes 5 and 6

51

Packet Access

2.4 kbps

Synch

2.4 kbps

UDI

NT

See note 5

52

Packet Access

4.8 kbps

Synch

4.8 kbps

UDI

NT

See note 5

53

Packet Access

9.6 kbps

Synch

9.6 kbps

UDI

NT

See note 5

61

Alternate Speech/ Data

See note 3

70

GPRS

Async

Variable

UDI

T or NT

81

Speech Followed by

Data

See note 3

NOTE 1: The non-transparent versions of Bearer Services 32, 33 and 34 are only specified for the Basic Packet service, defined in GSM 09.06 [14].

NOTE 2: Although the general information transfer capability is UDI, the information transfer capability on the network-specific interface between the IWF and the PAD may be UDI or 3,1 kHz and is the choice of the network operator.

NOTE 3: The data phase of Bearer Services 61 and 81 will be the same as Bearer Services 20 – 34 with 3,1 kHz Information Transfer Capability.

NOTE 4: Bearer Service 23 and 43 are applicable to Mobile Originated (MO) calls only. The 75 bps is used in the uplink and the 1200 bps is used in the downlink.

NOTE 5: This Bearer Service is applicable to Mobile Originated (MO) calls only.

NOTE 6: This General Bearer is independent of any nominal rate. It is elaborated in more detail in subclause 3.1

NOTE 7: Please refer to subclause 3.1.

3.1 General bearer service user data characteristics

The tables below describe the characteristics of the General Bearer Services. The indicated fixed network user rates are possible, but support of General Bearer Service does not imply support of all rates.

3.1.1 3,1 kHz Audio

Fixed Network User Rate

Access Structure

Information Transfer Capability

QoS attributes

Note

0.3 kbit/s

Asynch

3,1 kHz

NT or T

note 2

1.2 kbit/s

Asynch, Synch

3,1 kHz

NT or T

notes 1 and 2

1.2/0.075 kbit/s

Asynch

3,1 kHz

NT or T

note 2

2.4 kbit/s

Asynch, Synch

3,1 kHz

NT or T

note 2

4.8 kbit/s

Asynch, Synch

3,1 kHz

NT or T

note 2

9.6 kbit/s

Asynch, Synch

3,1 kHz

NT or T

note 2

14.4 kbit/s

Asynch, Synch

3,1 kHz

NT or T

19.2 kbit/s

Asynch, Synch

3,1 kHz

NT or T

28.8 kbit/s

Asynch, Synch

3,1 kHz

NT or T

NOTE 1: Not applicable to synchronous NT service.

NOTE 2: These services are also supported by the GSM Phase 2 Specifications.

3.1.2 V.110 UDI

Fixed Network User Rate

Access Structure

User Information Layer 1 protocol

QoS Attribute

Notes

0.3 kbit/s

Asynch

V.110

NT or T

note 2

1.2 kbit/s

Asynch, Synch

V.110

NT or T

note 1

note 2

2.4 kbit/s

Asynch, Synch

V.110

NT or T

note 2

4.8 kbit/s

Asynch, Synch

V.110

NT or T

note 2

9.6 kbit/s

Asynch, Synch

V.110

NT or T

note 2

14.4 kbit/s

Asynch, Synch

V.110

NT or T

19.2 kbit/s

Asynch, Synch

V.110

NT or T

28.8 kbit/s

Asynch, Synch

V.110

NT or T

38.4 kbit/s

Asynch, Synch

V.110

NT or T

48 kbit/s

Synch

V.110

T

56 kbit/s

Synch

V.110

T (in a 64 kbit/s environment)

NOTE 1: Not applicable to synchronous NT service.

NOTE 2: These services are also supported by the GSM Phase 2 Specifications.

3.1.3 X.31 Flag Stuffing UDI

Fixed Network User Rate

Access Structure

User Information Layer 1 protocol

QoS Attribute

Notes

2.4 kbit/s

Synch

X.31 Flag Stuffing

NT

note

4.8 kbit/s

Synch

X.31 Flag Stuffing

NT

note

9.6 kbit/s

Synch

X.31 Flag Stuffing

NT

note

14.4 kbit/s

Synch

X.31 Flag Stuffing

NT

19.2 kbit/s

Synch

X.31 Flag Stuffing

NT

28.8 kbit/s

Synch

X.31 Flag Stuffing

NT

38.4 kbit/s

Synch

X.31 Flag Stuffing

NT

48 kbit/s

Synch

X.31 Flag Stuffing

NT

56 kbit/s

Synch

X.31 Flag Stuffing

NT

NOTE: These services are also supported by the GSM Phase 2 Specifications.

3.1.4 V.120

Fixed Network User Rate

Access Structure

User Information Layer 1 protocol

QoS Attribute

Notes

1.2 kbit/s

Asynch

V.120

NT

2.4 kbit/s

Asynch, Synch

V.120

NT

4.8 kbit/s

Asynch, Synch

V.120

NT

9.6 kbit/s

Asynch, Synch

V.120

NT

14.4 kbit/s

Asynch, Synch

V.120

NT

19.2 kbit/s

Asynch, Synch

V.120

NT

28.8 kbit/s

Asynch, Synch

V.120

NT

note 1

38.4 kbit/s

Asynch, Synch

V.120

NT

48 kbit/s

Asynch, Synch

V.120

NT

56 kbit/s

Asynch, Synch

V.120

NT

note 2

NOTE 1: Requires a new code point in V.120 specification to be defined.

NOTE 2: Not applicable in a 56 kbit/s environment.

3.1.5 Bit Transparent Mode

Fixed Network User Rate

Access Structure

User Information Layer 1 protocol

QoS Attribute

Notes

56 kbit/s

Synch

Bit transparent

T (RDI) (in a 56 kbit/s environment)

64 kbit/s

Synch

Bit transparent

T (UDI) (in a 64 kbit/s environment)

Annex A (informative):
Change history

Change history

SMG No.

TDoc. No.

CR. No.

Subclause affected

New version

Subject/Comments

SMG#22

305/97

A004

2.0

5.3.0

HSCSD use of multiple TS in alternate & followed by Services.

SMG#28

812/99

A006

0,1, 2, 3

7.0.0

Addition of Supplementary Code for GPRS. (R98) Applied March 2, 1999 based on R97

7.0.2

Update to Version 7.0.3 for Publication