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The Mobile Application Part ('''MAP''') is an SS7 protocol which provides an application layer for the various nodes in GSM and UMTS Mobile Core Networks and GPRS Core Networks to communicate with each other in order to provide services to Mobile Phone users. The Mobile Application Part is the application-layer protocol used to access the Home Location Register, Visitor Location Register, Mobile Switching Center, Equipment Identity Register, Authentication Centre, Short Message Service Center and Serving GPRS Support Node.


FACILITIES PROVIDED

The primary facilities provided by MAP are:

  • Mobility Services: location management (when subscribers move within or between networks), authentication, managing service subscription information, fault recovery,

  • Operation and Maintenance: subscriber tracing, retrieving a subscriber's IMSI

  • Call Handling: routing, managing calls whilst roaming, checking that a subscriber is available to receive calls

  • Supplementary Services

  • Short Message Service

  • Packet Data Protocol (PDP) services for GPRS : providing routing information for GPRS connections

  • Location Service Management Services: obtaining the location of subscribers



PUBLISHED SPECIFICATION


The Mobile Application Part specifications were originally defined by the GSM Association, but are now controlled by ETSI / 3GPP . MAP is defined by two different standards, depending upon the mobile network type:

  • MAP for GSM (prior to Release 4) is specified by 3GPP TS 09.02

  • MAP for UMTS ("3G") and GSM (Release 99 and later) is specified by 3GPP TS 29.002



IMPLEMENTATION


MAP is a Transaction Capabilities Application Part (TCAP) user, and as such can be transported using 'traditional' SS7 protocols or over IP using SIGTRAN via an appropriate adaptation layer such as the SCCP User Adaptation (SUA) layer or MTP3 User Adaptation (M3UA) layer.


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