09.033GPPSignalling Requirements on Interworking between the Intergrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) and the Public Land Mobile Network (PLMN)TS
4.1 Requirements for the mobile network
In order to be integrated in the fixed network the PLMN must comply with the following requirements:
a) The Mobile Application Part (MAP) which supports information exchanges between the nodes of the mobile service uses the facilities of Transactions Capabilities (TC) of Signalling System No. 7 (SS7). Therefore the equipments of the mobile network must comply with the specifications of the interface between TC and the application user. If TC functions are integrated in the mobile network equipments, the latter must comply with the relevant specifications (CCITT Recommendations Q.771 to Q.774).
b) For MAP messages routing purpose, the mobile nodes must provide the Signalling Connection Control Part (SCCP) via TC with an address complying with the relevant specifications (CCITT Recommendations Q.711 to Q.714).
c) For call set-up, the Mobile-services Switching Centres (MSCs) must interface with the fixed exchanges. In the detailed interworking specifications, the fixed network signalling considered are the SS7 and its User Parts (Telephone User Part (TUP) or Integrated Services Digital Network User Part (ISUP)). The MSCs must comply with the same signalling interface specifications as the fixed exchanges.
d) The Public Land Mobile Network (PLMN) and the signalling on the radio path must provide the information needed to ensure a correct interworking with the fixed network. The interworking in the MSCs must occur with a minimum loss of information.
e) The PLMN nodes must interface with the SS7 signalling network. For that, they must comply with the Message Transfer Part (MTP) specifications (CCITT Recommendations Q.701 to Q.707).
f) The signalling interface between ISDN and PLMN is described in ETS 300 303.