Page 447 - 5G Basics - Core Network Aspects

Core network aspects 1

5 Conventions

In this Recommendation, references to "mobile network" should be read as applying equally to GSM/UTRAN
[ITU-T Q.1741] networks and ANSI-41/cdma2000 [ITU-T Q.1742] networks.
In addition:
• "he" should be read as gender neutral, that is referring to "he" or "she" as appropriate; and
• "his" should similarly be read as gender neutral.

6 Service features

The PAM service provides a mobile user with access to voice and video telephony services utilizing the
PSTN/ISDN via an available access point (AP) with an appropriate dual mode mobile terminal. Whether the
AP is connected to the legacy network via a PSTN analogue or an ISDN access interface does not affect the
service from the PAM user's point of view.
The dual mode dual radio mobile terminal provides the user the accesses to the legacy PSTN/ISDN and mobile
networks using a single terminal.

6.1 Service numbering
The PAM service supports two types of numbering:

• The user is identified by a discrete PAM service number (referred to as a "fixed PAM service number"
which may be in the form of, e.g., an UPT number). The fixed PAM service number is used separately
from the user's mobile number (MSISDN). The fixed PAM service number is used to make and
receive calls when the user is being provided service by means of a PSTN/ISDN access, while the
mobile number (MSISDN) is used when the user is being provided service by means of a mobile
network access.
• The user is identified by his MSISDN, which is also his PAM service number, independent of whether
he is being provided service by a PSTN access or a mobile network access.

6.2 Service subscription
The user needs to subscribe to the PAM service in advance.

• When the fixed PAM service number is used, the subscription information is as follows:
– a fixed PAM service number assigned by the provider;
– a user identity assigned by the provider which links to the PAM service number of the user;
– the user's associated MSISDN for re-routing the terminating call to the mobile network in case
the call is not possible to be completed through the PSTN/ISDN;
– the service access code (SAC) of PAM service which corresponds to the PAM service controlling
point of the home network.
• When a MSISDN is used as the PAM service number, the subscription information is as follows:
– the user's IMSI;
– a user identity assigned by the provider which links to the IMSI of the user terminal;
– the service access code (SAC) of PAM service which corresponds to the PAM service controlling
point of the home network;
– the PAM service subscription to be registered in the user's service profile (in the HLR/AuC
(HSS)).

6.3 Registration and authentication for legacy fixed network access

The mobile user needs to register at a fixed network access point before making and receiving calls.
Authentication is mandatory when a mobile user requests legacy PSTN/ISDN access.

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