Sin t

1
Adaptation of SOMT to the development of systems
based upon a standard
JUAN PABLO ALBALADEJO MÁRQUEZ JAVIER PONCELA
GONZÁLEZ
2
Adaptation of SOMT to the development of systems
based upon a standard

• Introduction
• DECT network layer
• SOMT methodology
• Requirements analysis
• System analysis
• System design
• Object design
• Conclusions

• Introduction

3
Introduction

• Need for fast and reliable development processes
• Maintenance of quality levels
• More capable methods
• Formal languages
• Object orientation

SDL92
Introduction
4
Objective

• Adaptation of SOMT to the development of systems
  based upon a standard

Method

• Election of an object-oriented methodology
• Use of the tool Tau 3.2 by Telelogic
• Modelling of the network level of a DECT system
  (Digital Enhanced Cordless Telecommunication)

Introduction
5
Adaptation of SOMT to the development of systems
based upon a standard

• Introduction
• DECT network layer
• SOMT methodology
• Requirements analysis
• System analysis
• System design
• Object design
• Conclusions

6
DECT network level

• DLC Data Link Control
• MAC Medium Access Control
• LLME Lower Layer Management Entity
• CC Call Control
• MM Mobility Management
• LCE Link Control Entity

Introduction
7
Adaptation of SOMT to the development of systems
based upon a standard

• Introduction
• DECT network layer
• SOMT methodology
• Requirements analysis
• System analysis
• System design
• Object design
• Conclusions

8
SOMT methodology
Requirements

• Capability to be used with formal languages
• Adaptation to the object-oriented focus
• Progressive evolution towards the final result
• Traceability among the elaborated models
• Integration with the chosen tool

SOMT methodology
9
SOMT (SDL-oriented Object Modeling Technique)
SOMT methodology
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Adaptation of SOMT to the development of systems
based upon a standard

• Introduction
• DECT network layer
• SOMT methodology
• Requirements analysis
• System analysis
• System design
• Object design
• Conclusions

11
Requirements analysis
Modified SOMT activities
SOMT activities

• Textual requirements model
• Requirements use case model
• Requirements object model
• System operation model
• Data dictionary

• Incorporation of the standard

• Data dictionary

Requirements analysis
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DECT standard

• Study of the architecture
• Particularization for GAP (Generic Access
  Profile)

Data dictionary

• Nouns section
• Mobility Management (MM) - Entity in charge of
  managing the identities, authentication,
  localization, access rights, key assignment and
  ciphering.
• Actions section
• Identification of PT - Procedure used by FT to
  ask PT for its identification using specific
  parameters such as IPUI o IPEI. (MM Procedure)
• Relations section implicitly elaborated

Requirements analysis
13
Adaptation of SOMT to the development of systems
based upon a standard

• Introduction
• DECT network layer
• SOMT methodology
• Requirements analysis
• System analysis
• System design
• Object design
• Conclusions

14
System analysis
Modified SOMT activities
SOMT activities

• Analysis use case model

• Analysis use case model
• Analysis object model
• Textual documentation

• Analysis object model

• Textual documentation

System analysis
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Analysis use case model (1)

• Dynamic viewpoint of the standard
• Messages exchange
• Timer handling
• State changing
• Different levels of hierarchy
• HMSCs
• Use cases
• Behaviour patterns

System analysis
16
Analysis use case model (2)

• Increased formality compared to the standard
• Connection through implinks of each diagram with
  its definition in the data dictionary

System analysis
17
Textual documentation

• Original purpose to complete the description of
  the system
• Modified purpose explain the informalities in
  the use case model
• Treated aspects
• Handling of timers in subdiagrams
• Actions associated to the expiry of timers
• Reuse of diagrams

System analysis
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Object model (1)

• Static viewpoint of the standard
• Elaboration
• Cooperating objects association and composition
  relations
• Similar objects inheritance relations

System analysis
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Object model (2)

• Elaboration
• Contained information attributes
• Performed actions operations
• Connection through implinks of each class with
  its definition in the data dictionary

System analysis
20
Adaptation of SOMT to the development of systems
based upon a standard

• Introduction
• DECT network layer
• SOMT methodology
• Requirements analysis
• System analysis
• System design
• Object design
• Conclusions

21
System design
Modified SOMT activities
SOMT activities

• Design uses case model
• Design module structure
• Architecture definition
• Textual requirements

• Object model

• Design uses case model

• Architecture definition

System design
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Object model (1)

• Advance in the study of the standard
• Introduction of Card class
• Modification of existing relations
• Connection through implinks with the analysis
  object model classes

System design
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Object model (2)

• Incorporation of attributes
• Adition of operatios related to the new classes

System design
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Design module structure

• Detailed study of the standard
• Considerations concerning the implementation
• Connection through implinks with the design
  object model classes

System design
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Architecture definition

• Translation of the former model contents to
  SDL92
• Taking into account of the object model
• Structural and functional modules

System design
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F_NWK system

• Blocks modelling the composition relations
• Incompatibility of blocks and processes
• Adyacent levels modelled as the environment

System design
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Nwk block

• Analogue structure to the one defined in the
  standard
• Adyacent levels modelled as the environment

System design
28
Adaptation of SOMT to the development of systems
based upon a standard

• Introduction
• DECT network layer
• SOMT methodology
• Requirements analysis
• System analysis
• System design
• Object design
• Conclusions

29
Object design
Modified SOMT activities
SOMT activities

• Object design model (SDL)

• Object design model (SDL)
• Interfaces
• Behaviour

Object design
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Interfaces definition

• Signal lists
• SIGNALLIST SAP0_NWK DL_DATA_IND,
  DL_ESTABLISH_CFM, DL_ESTABLISH_ IND,
  DL_RELEASE_CFM, DL_RELEASE_IND
• Messages and primitives
• / ETS 300 175-5 5, subsclause 16.3.6.1 /
• / /
• newtype ASP_MM_IDENTITY_REQ
• struct
• mm_endpoint_identifier ENDPOINT_IDENTIFIER /
  // /
• identity_type IDENTITY_TYPE / / / /
• iwu_to_iwu IWU_TO_IWU / / / /
• endnewtype ASP_MM_IDENTITY_REQ
• Information elements
• / ETSI 300 175-5 5, subclause 7.7.19 /
• / /
• newtype IDENTITY_TYPE

Object design
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Behaviour definition
First step
Second step

• Connection through implinks of the behaviours
  withs their definitions in the data dictionary

Object design
32
Adaptation of SOMT to the development of systems
based upon a standard

• Introduction
• DECT network layer
• SOMT methodology
• Requirements analysis
• System analysis
• System design
• Object design
• Conclusions

33
Conclusions

• Common advantages to SOMT and M-SOMT
• Object-orientation and use of formal languages
• Progressive evolution towards the final result
• Connection of the elaborated models
• Improvements of M-SOMT
• Improved use of the previous models in the
  elaboration of the next ones

Conclusions
34
M- SOMT methodology
SOMT methodology
Conclusions
35
Adaptation of SOMT to the development of systems
based upon a standard
JUAN PABLO ALBALADEJO MÁRQUEZ JAVIER PONCELA
GONZÁLEZ