3 Reference Configuration
24.0023GPPGSM - UMTS Public Land Mobile Network (PLMN) Access Reference ConfigurationRelease 17TS
3.0 General
The reference configuration for PLMN (in A/Gb mode and GERAN Iu mode) access interfaces is shown in figure 1.
: reference point.
TE2: V -type terminal.
TA: Terminal Adaptor.
GERAN: GSM/EDGE Radio Access Network.
CN: Core Network.
Figure 1: PLMN Access Reference Configuration (in A/Gb mode and GERAN Iu mode)
There are two types of MT:
– MT0 includes functions belonging to the functional group MT, with support of no terminal interfaces.
– MT2 includes functions belonging to the functional group MT, and with an interface that complies with the 3GPP TS 27.00z series Terminal Adaptation Function specifications [33], [34], [35]. Accordingly, the interchange circuit mapping at the MT2 to TE interface shall comply with the ITU-T V.24 [42] recommendation; while the physical implementation shall conform either to the ITU-T V.28 [43], or to the IrDA IrPHY Physical signalling standard specification [44], or to the PCMCIA 2.1 [45], or to the PC-Card 3.0 [45], electrical specification or to later revisions.
The MT plus any TE constitutes the Mobile Station, MS.
The terminal equipment functional groups TE2 and TA are conceptually the same functional groups as those in the ISDN.
The reference configuration for PLMN (Iu mode) access interfaces is shown in figure 2.
: reference point.
TA: Terminal Adaptor.
MT: Mobile Termination.
ME: Mobile Equipment.
UE: User Equipment
UTRAN: UMTS Radio Access Network.
E-UTRAN: Evolved UMTS Radio Access Network.
CN: Core Network.
5G-AN: 5G Access Network.
Figure 2: PLMN Access Reference Configuration (UTRAN Iu mode, E-UTRAN, or 5G-AN)
There is no reference point identified for the TA Function. The TA Function is considered as a part of the Mobile Termination and with an interface that complies with the 3GPP TS 27.00z series Terminal Adaptation Function specifications [33], [34], [35].
3.1 Mobile Termination (MT)
The MT performs the following functions, which performs the following functions:
– radio transmission termination;
– radio transmission channel management;
– terminal capabilities, including presentation of a man-machine interface to a user;
– speech encoding/decoding;
– error protection for all information sent across the radio path. This includes FEC (forward error correction) and, for signalling and user data (except for transparent data services), ARQ (automatic request for retransmission);
– flow control of signalling and mapping of user signalling to/from PLMN access signalling;
– flow control of user data (except for transparent data services) and mapping of flow control for asynchronous transparent data services;
– rate adaptation of user data (see 3GPP TS 44.021[14]) and data formatting for the transmission SAP (3GPP TS 25.322 [41]);
– multiple terminal support;
– mobility management.