GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

11 General
11.1 Overview
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GSM 09.02 version 5.3.0: August 1996
Clause 11 to 14 specify the protocol elements to be used to provide the MAP services described in
clause 5.
Clause 12 specifies the elements of procedures for the MAP protocol. Clause 13 specifies the mapping on
to TC service primitives. Clause 14 specifies the application contexts, operation packages and abstract
syntaxes for the MAP protocol as well as the encoding rules to be applied.
11.2 Underlying services
The MAP protocol relies on the services provided by the Transaction Capabilities (TC) of signalling system
number 7, as referenced in clause 4.
11.3 Model
The MAP Protocol Machine (MAP PM) can be modelled as a collection of service state machines (SSMs) -
one per MAP specific service invoked - coordinated by a MAP dialogue control function with its one state
machine: MAP dialogue state machine (DSM). There are two types of Service State Machines: Requesting
Service State Machines (RSM) and Performing Service State Machines (PSM).
A new invocation of a MAP PM is employed on the receipt of a MAP-OPEN request primitive or a
TC-BEGIN indication primitive. Each invocation controls exactly one MAP dialogue. For each MAP specific
service invoked during a dialogue, a MAP RSM is created at the requestor's side and a MAP PSM is
created at the performer's side.
This modelling is used only to facilitate understanding and the MAP behaviour descriptions and is not
intended to suggest any implementation. SDL descriptions are organized according to this model.
How the MAP-service-user and the MAP refer to a MAP dialogue (i.e. a MAP PM invocation) is a local
implementation matter.
How TC dialogue identifiers are assigned to a MAP PM invocation is also a local implementation matter.
11.4 Conventions
The behaviour of the MAP PM depends on the application-context-name associated with the dialogue. One
major difference is that the MAP requests the transfer of the application-context-name by TC only for
those contexts which do not belong to the so-called "version one context set".
The "version one context set" is a set of application-contexts which model the behaviour of a MAP V1
implementation according to the latest phase 1 version of TS GSM 09.02. This set is defined in clause 12.
The procedures described in clause 12 are used when the application-context-name does not refer to a
dialogue between an MSC and its VLR. When the application-context-name refers to a dialogue between
an MSC and its VLR the MAP PM procedures are a local implementation matter.