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The purpose of recommending MSC (Message
Sequence Chart) is to provide a trace language for the specification and description of the communication behaviour of system components and their environment by means of message interchange. Since in MSCs the communication behaviour is presented in a very
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The diagram shows three entities. At start the phone is disconnected. A user tries to establish a connection. A connection request is sent to the switch and a timer is started. An alternative deals with two possibles responses: 1 - The timer goes off because the switch did not reply and the phone
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intuitive and transparent manner, particularly in the graphical representation, the MSC language is easy to learn, use and interpret. In connection with other languages it can be used to support methodologies for system specification, design, simulation, testing, and documentation.
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In an MSC, the vertical lines are autonomous execution entities. They usually represent state machines executing in parallel. The state machines need not be on the same computer.
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In a
Sequence Diagram, a vertical line is usually an object. The object can be active (in its own thread of execution) or passive (in the execution context of an active object).
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In a
Sequence Diagram an arrow is usually understood as an operation call on a class. It is therefore synchronous and the calling entity hangs until the operation returns.
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In an MSC an arrow is usually an asynchronous message sent from one entity to another one. Once the message is sent the sending entity resumes its execution.
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The MSC 2000 version added object orientation, refined the use of data and time in diagrams, and added the concept of remote method calls.
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In-line expressions: alternative composition, sequential composition, exception, optional region, parallel composition, iteration (loop).
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Control flow: horizontal arrow with the 'call' prefix, dashed arrow for reply symbol, method and suspension symbols in between.
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is strongly inspired by the ITU-T MSC. Still, for historical reasons, the default basic principles are quite different:
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Data concept: The user can use any data concept, if binding is undefined the default data concept is the one from
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MSC head, lifeline, and end: a vertical line with a box at the top, and a box or a cross at the bottom.
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goes back to the disconnected state.2 - The switch grants the connection and the call is established.
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The relationship between the MSC requirements and the executable specification is not clear,
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Property
Sequence Chart, a way to describe properties in an MSC or a Sequence Diagram.
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549:(2002). "Multiple instances and symbolic variables in executable sequence charts".
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590:. Lecture Notes in Computer Science. Vol. 7916. Springer. pp. 19–35.
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and proposed Live
Sequence Charts (LSC) as an extension on the MSC standard .
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Conditions: usually used to represent a state of the underlying state machine.
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semantics that makes it impossible to capture some behavioral requirements,
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Instance creation: horizontal dashed arrow to the newly created instance.
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Specification and
Description Language, an MSC related ITU-T language.
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The first version of the MSC standard was released on March 12, 1993.
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It has been said that MSC has been considered as a candidate for the
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Coregion: a double dashed instance line to describe unordered events.
511:(2005-02-22). "LSCs: Breathing Life into Message Sequence Charts".
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Time interval: relative and absolute with a dashed vertical arrow.
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harts), which are the way of expressing a sequence of MSCs.
422:"Towards a Harmonization of UML-Sequence Diagrams and MSC"
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Ekkart
Rudolph; Jens Grabowski; Peter Graubmann (1999).
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Latest version has been published in
February 2011.
447:"UML 2.0 vs. SDL/MSC – Ericsson Position Statement"
588:SDL 2013: Model-Driven Dependability Engineering
74:The 1996 version added references, ordering and
286:suggested that MSC had shortcomings such as:
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400:"What is new in MSC 2000 relative to MSC 96"
78:expressions concepts, and introduced HMSC (
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275:for modelling large or complex systems.
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27:Interaction diagram from the SDL family
586:Emmanuel Gaudin; Eric Brunel (2013).
197:a semaphore instance representation.
163:Reference: reference to another MSC.
57:International Telecommunication Union
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267:However, proponents of MSC such as
178:as defined in Z.121 recommendation.
126:Message exchange: horizontal arrow.
653:Unified Modeling Language diagrams
121:Dynamic process creation in an MSC
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203:SDL-RT Semaphore extension to MSC
140:Timers: start, cancel, time out.
513:Formal Methods in System Design
208:a save symbol to save messages.
643:Formal specification languages
271:think that MSC is better than
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624:message sequence chart (MSC)
445:Øystein Haugen (June 2000).
596:10.1007/978-3-642-38911-5_2
323:Interaction diagrams in UML
55:family standardized by the
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658:Software modeling language
622:ITU-T Recommendation Z.120
108:The existing symbols are:
478:"Message Sequence Charts"
149:Time constraint in an MSC
135:Call operation in an MSC
525:10.1023/A:1011227529550
426:University of Göttingen
169:MSC Reference in an MSC
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41:message sequence chart
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18:Message Sequence Chart
573:10.1145/583854.582429
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279:Live Sequence Charts
262:interaction diagrams
648:Telephone exchanges
551:ACM SIGPLAN Notices
290:MSC propose a weak
49:interaction diagram
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605:978-3-642-38910-8
215:Comparison to UML
186:Symbol extensions
16:(Redirected from
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483:. Archived from
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374:. Archived from
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363:Øystein Haugen.
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292:partial ordering
221:Sequence Diagram
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616:External links
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564:10.1.1.20.5984
557:(11): 83–100.
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157:Action: a box.
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104:Symbols in MSC
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490:on 2006-08-26
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492:. Retrieved
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404:. Retrieved
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547:David Harel
509:David Harel
474:David Harel
284:David Harel
632:Categories
494:2009-09-20
459:2009-09-19
431:2014-08-25
406:2009-09-19
385:2009-09-19
365:"MSC 2000"
349:2009-09-19
330:References
82:igh-level
559:CiteSeerX
519:: 45–80.
227:Lifelines
51:from the
638:Diagrams
454:Ericsson
372:Ericsson
305:See also
269:Ericsson
264:in UML.
219:UML 2.0
90:equence
76:inlining
47:) is an
533:1551133
273:UML 2.0
86:essage
67:History
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561:
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343:"HMSC"
244:Arrows
192:SDL-RT
529:S2CID
488:(PDF)
481:(PDF)
450:(PDF)
379:(PDF)
368:(PDF)
600:ISBN
43:(or
592:doi
569:doi
521:doi
317:SDL
311:PSC
176:SDL
53:SDL
45:MSC
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