A.1 Information transfer attributes
22.0013GPPPrinciples of circuit telecommunication services supported by a Public Land Mobile Network (PLMN)Release 17TS
A.1.1 Information transfer capability
This attribute describes the capability associated with the transfer of different types of information through a PLMN and another network or through a PLMN.
Values:
– unrestricted digital information;
transfer of information sequence of bits at its specified bit rate without alteration; this implies bit sequence independence, digit sequence integrity and bit integrity.
– speech;
digital representation of speech information and audible signalling tones of the PSTN coded according to the encoding rule defined in the 3GPP TS 26 series of specifications.
– 3,1 kHz Ex PLMN;
unrestricted digital information transfer within the PLMN and 3.1 kHz audio restricted within the ISDN.
– group 3 Fax;
transfer of Group 3 Fax information.
A.1.2 Information transfer mode
This attribute describes the operational mode of transferring (transportation and switching) through a PLMN.
Values:
– circuit.
A.1.3 Information transfer rate
This attribute describes the bit rate (circuit mode). It refers to the transfer of digital information between two access points or reference points.
Values:
– appropriate bit rate, throughput rate.
A.1.4 Structure
This attribute refers to the capability of the PLMN and if involved other networks to deliver information to the destination access point or reference point in a structure.
Note: This attribute has not been utilised in 3GPP TS 22.002 [5] or 3GPP TS 22.003 [6].
Values:
– not applicable.
A.1.5 Establishment of communication
This attribute associated with a telecommunication service describes the mode of establishment used to establish and a given communication.
In every telecommunication service communication may be between users within the PLMN or between a user in the PLMN and a user in another network.
Values:
– demand Mobile Originated (MO) only;
– demand Mobile Terminated (MT) only;
– demand Mobile Originated or Terminated (MO, MT).
A.1.6 Communication configuration
This attribute describes the spatial arrangement for transferring information between two or more access points. It completes the structure associated to a telecommunication services as it associates the relationship between the access points involved and the flow of information between these access points.
Values:
– point-to-point communication;
this value applies when there are only two access points.
– multipoint communication;
this value applies when more than two access points (1) are provided by the service. The exact characteristics of the information flows must be specified separately based on functions provided by the PLMN.
NOTE 1: The number of access points can be undefined.
– broadcast communication;
this value applies when more than two access points (2) are provided by the service. The information flows are from a unique point (source) to the others (destination) in only one direction.
NOTE 2: The number of destination access points can be undefined.
A.1.7 Symmetry
This attribute describes the relationship of information flow between two (or more) access points or reference points involved in a communication.
It characterizes the structure associated to a communication service.
Values:
– unidirectional;
this value applies when the information flow is provided only in one direction.
– bidirectional symmetric;
this value applies when the information flow characteristics provided by the service are the same between two (or more) access points or reference points in the forward and backward directions.
– bidirectional asymmetric;
this value applies when the information flow characteristics provided by the service are different in the two directions.
A.1.8 Data compression
This attribute indicates whether use of a data compression function is desired (and accepted) between an MT and IWF.
Values:
– use of data compression requested/not requested;
– use of data compression accepted/not accepted.