MOBILE APPLICATION PART Chapter 12 has described the signaling between a mobile station (MS) and a mobile switching center (MSC) in a cellular (public land) mobile network (CMN, PLMN). The present chapter describes the mobile application part (MAP) of signaling system (SS7). MAP defines a number of remote operations (transactions) that support mobile telecommunications. Public switched telecommunication networks (PSTN) are f^lxed networks. A subscriber line is fixed (attached) to a local exchange, which has a record for each of its subscribers. . | Signaling in Telecommunication Networks. John G. van Bosse Copyright 1998 John Wiley Sons Inc. ISBNs 0-471-57377-9 Hardback 0-471-22415-4 Electronic MOBILE APPLICATION PART Chapter 12 has described the signaling between a mobile station MS and a mobile switching center MSC in a cellular public land mobile network CMN PLMN . The present chapter describes the mobile application part MAP of signaling system SS7 . MAP defines a number of remote operations transactions that support mobile telecommunications. Public switched telecommunication networks PSTN are fixed networks. A subscriber line is fixed attached to a local exchange which has a record for each of its subscribers. The record contains semipermanent and temporary data. Semipermanent data in the record include the subscriber s directory number and service profile. This is a list of features for example call waiting which the subscriber has requested and the telecom has agreed to supply for a monthly or per-use charge. The temporary data include information on the current subscriber state busy idle denied service and during the times that the subscriber is involved in a call details about the connection. The exchange consults these data when processing the subscriber s calls. When a MSC is serving a MS it needs similar data. However a MS is mobile. At different points in time it can be in the service area of different MSCs. It is not practical to store the information on all mobiles at every MSC. Instead this information is stored in centralized databases. One of the purposes of MAP transactions is to enable the MSCs to obtain information about a MS from these databases. This chapter describes two versions of MAP. The . version denoted here as IS-MAP is defined by the Electronic Industries Association EIA and the Telecommunications Industry Association TIA . The international version 478 INTRODUCTION TO IS-MAP 479 used in the Global System for Mobile Communications GSM and denoted here as GSM-MAP is .
