ETSI TR 101 877 V1.1.1 (2001-06)

SLOVENSKI STANDARD
01-april-2004
Harmonizacija telekomunikacij in internetnega protokola prek omrežij (TIPHON) -
Študija definicije zahtev - Vsebina in zahteve za preprosti klic
Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON);
Requirements Definition Study; Scope and Requirements for a Simple call
Ta slovenski standard je istoveten z: TR 101 877 Version 1.1.1
ICS:
33.020 Telekomunikacije na splošno Telecommunications in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Technical Report
Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON);
Requirements Definition Study;
Scope and Requirements for a Simple call

2 ETSI TR 101 877 V1.1.1 (2001-06)
Reference
DTR/TIPHON-01008
Keywords
IP, service
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ETSI
3 ETSI TR 101 877 V1.1.1 (2001-06)
Contents
Intellectual Property Rights .4
Foreword.4
1 Scope.5
2 References.5
3 Definitions and abbreviations.5
3.1 Definitions . 5
3.2 Abbreviations. 6
4 Services and service capabilities framework.7
4.1 The ITU ISDN approach to describing services. 7
4.2 The TIPHON environment . 7
4.3 Service capability framework . 9
5 Building service applications .10
5.1 Structuring service applications . 10
5.2 Service application models . 11
6 Deriving service capabilities .12
6.1 Structuring service capabilities . 12
6.2 Service capability model. 12
7 Simple call service application.12
7.1 Simple call as a basic service application . 12
7.1.1 Scope of the simple call service application . 13
7.1.2 Behaviour of the simple call service application. 14
7.1.3 Use of service capabilities. 14
7.2 Service capabilities for simple call. 14
7.2.1 Simple connectivity control. 14
7.2.2 Simple registration. 15
8 Prioritized requirements.15
Annex A: Business role model in a TIPHON environment .16
A.0 Introduction.16
A.1 Consumer .16
A.2 Retailer.17
A.3 Service provider.17
A.4 Connectivity provider .17
A.5 Relationships between domains.18
History .19
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4 ETSI TR 101 877 V1.1.1 (2001-06)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Report (TR) has been produced by ETSI Project Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON).
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5 ETSI TR 101 877 V1.1.1 (2001-06)
1 Scope
The present document defines the TIPHON framework that enables services to be developed which are able to
inter-work across multiple communication network domains and diverse network technologies. The framework
identifies services, service capabilities and service applications and defines the relationships between them.
The present document:
• considers how Service Capabilities can be combined to develop Service Applications;
• defines the requirements for a Simple Call Service Application.
The content of the present document does not infer any details of the implementation of any of the concepts expressed
within it.
2 References
For the purposes of this Technical Report (TR), the following references apply:
[1] ETSI TR 101 835: "Telecommunications and Internet Protocol Harmonization over Networks
(TIPHON); Project method definition".
[2] ITU-T Recommendation I.130: "Method for the characterization of telecommunication services
supported by an ISDN and network capabilities of an ISDN".
[3] ITU-T Recommendation I.140: "Attribute technique for the characterization of telecommunication
services supported by an ISDN and network capabilities of an ISDN".
[4] ITU-T Recommendation I.210: "Principles of telecommunication services supported by an ISDN
and the means to describe them".
[5] ITU-T Recommendation I.112: "Vocabulary of terms for ISDNs".
[6] ETSI TR 101 287: "Network Aspects (NA); Terms and definitions".
[7] ITU-T Recommendation E.105: "International telephone service".
[8] ITU-T Recommendation E.106: "Description of an international emergency preference scheme
(IEPS)".
[9] TINA-C: "TINA Business Model and Reference Points".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
administrative domain: bounded entity within which all encompassed constituent elements are under common
ownership, operation and management
domain: result of the application of specific policies to a specific network technology
International Emergency Preference Scheme (IEPS): IEPS enables authorized users to have priority access to
telecommunication services and priority processing of communications in support of recovery operations during
emergency events
network: telecommunications network that provides telecommunications services
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network abstraction LAYER: provides a set of communications capabilities to the Transport Abstraction Layer that
are derived from, but independent of, the capabilities of a specific underlying network technology
network operator: entity that is responsible for the development, provisioning and maintenance of telecommunications
services and for operating the corresponding networks
public: attribute indicating that the application of an item qualified as "public" is offered to any person
This attribute does not indicate any aspects of ownership.
private: attribute indicating that the application of an item qualified as "private" is offered to a pre-determined set of
users
This attribute does not indicate any aspects of ownership.
service: commercial offering to a customer
It comprises functionality - known as a service application - set in a business context. The business context is outside of
the scope of TIPHON to consider as it determined by commercial or political concerns.
service abstraction layer: element of the TIPHON Application Plane that provides a modular and extensible set of
Service Capabilities for use in the creation of Service Applications
service application: integrated set of one or more Service Capabilities
TIPHON will not specify service applications but may consider such groupings where this contributes to the
identification and definition of specific Service Capabilities. The ability to select and combine Service Capabilities
offers a structured, yet flexible, means for creating service applications that:
• are internally coherent and self consistent;
• enable the inter-operation of services between different implementations of TIPHON systems;
• enable inter-working with other systems.
service capability: indivisible and exclusive set of functionality including user and network capabilities
service independent requirement: requirement that applies without reference to currently invoked service capabilities
service provider: entity that provides services to its service subscribers on a contractual basis and who is responsible
for the services offered
The same entity may act as both a network operator and a service provider.
service provider access interface: interface between a network and a service provider's equipment for enabling the
service provider to access specific functionality of a network
transport abstraction layer: provides a set of domain independent capabilities derived from the underlying Network
Abstraction Layer in response to the transport and connectivity requirements of the Service Abstraction Layer
user: entity using the services of a network via terminal equipment
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
GSM Global System for Mobile communication
IEPS International Emergency Preparedness Scheme
ISDN Integrated Services Digital Network
RDS Requirements Definition Study
SCD Service Capability Definition
SP Service Provider
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7 ETSI TR 101 877 V1.1.1 (2001-06)
4 Services and service capabilities framework
Traditional approaches to developing services offered by communications networks have largely been specific to a
single network technology, such as ISDN. This has tended to create problems in enabling services to operate across
multiple network technologies. An alternative approach is to derive a core set of capabilities in an abstract manner and
then map these on to selected network technologies though an abstract, technology neutral, network architecture. By
adopting this approach, the services developed on specific network technologies may be derived from a common core
set of capabilities. This enables easier inter-working between different network technologies at the functional level.
By using a common core set of capabilities to implement services, a basic level of functional inter-working should be
assured for TIPHON based networks. Furthermore, the approach enables technical inter-working problems to be
identified in a structured manner.
The traditional service development approach described has also restricted the development of services to the
limitations of the specific network technologies upon which they are based. The alternative adopted by TIPHON is a
more flexible and extensible approach to service development because it enables services to be constructed from the
aggregation of modular, re-usable components based on the concepts of service applications and service capabilities.
Service Interaction is a common problem within modern communications networks. The modular and hierarchical
approach adopted by TIPHON allows easier identification and resolution of such problems by enabling them to be
traced to the presence or absence of specific capabilities and the relationships between them.
4.1 The ITU ISDN approach to describing services
ITU-T Recommendations I.130 [2], I.140 [3] and I.210 [4] describe a method of describing service applications in the
Integrated Services Digital Network (ISDN) by bearer and teleservice attributes. In general bearer services offer bearer
attributes to teleservices and the teleservices provide service by manipulation of the bearer attributes. This approach
views attributes of an overall service application in 3 parts.
Table 1: ITU ISDN 3 layer service application model
Part Sub-part Assigned attributes (examples)
Low layer Information transfer Mode
Rate
Structure
Access attributes Access channel and rate
Access protocol
Signalling for each of layers 1 to 3
Information protocol for each of layers 1 to 3
High layer Type of User Information
Protocol functions for each of layers 4 to 7
General Supplementary Service provided
QoS
Interworking capabilities
In an environment comprising multiple network technologies, the lower layer attributes will vary between network
technologies. In this approach, the information transfer and access layer attributes cannot be considered common
between users.
4.2 The TIPHON environment
The TIPHON environment considers the case where multiple networks, possibly employing differing network
technologies, inter-work to provide end-to-end communications services as shown in figure 1.
This model supports the different business roles found within the heterogeneous communications environment
envisaged by TIPHON (see Annex A) and commonly found in modern public communications networks. The key
requirements for this environment are:
• separation of service applications and transport services hence enabling users to access their call handling
services irrespective of their transport connection;
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8 ETSI TR 101 877 V1.1.1 (2001-06)
• ability of service applications to work across multiple network domains thereby enabling users to access their
services irrespective of the network domain they are connected to;
• ability of service applications to work across multiple network technologies thereby enabling service providers
to offer services using a range of network technologies;
• ability to recursively construct network domains thereby enabling network providers to extend the reach of their
networks.
By introducing a number of layers of abstraction, the TIPHON model provides a framework that is able to describe an
end-to-end application capable of operating over a heterogeneous infrastructure.
TIPHON Application Plane
Service Application Layer
Service Abstraction Layer
Transport
Plane/Application
Plane Interface
Transport Abstraction Layer
Network Abstraction Layer
Terminal Access Transit Transit Access Terminal
Domain #1 Domain#1 Domain#1 Domain#2 Domain#2 Domain #2
TIPHON Transport Plane
Figure 1: The TIPHON network and service environment model
TIPHON identifies the following layers within this model:
• a Service Application Layer that provides the end to end communications application;
• a Service Abstraction Layer that is defined by a modular and extensible set of Service Capabilities that place
requirements on the Transport Abstraction Layer beneath it;
• a Transport Abstraction Layer that provides a set of domain independent capabilities derived from the underlying
Network Abstraction Layer in response to the transport and connectivity requirements of the Service Abstraction
Layer;
• a Network Abstraction Layer that provides a set of communications capabilities to the Transport Abstraction
Layer that are derived from, but independent of, the capabilities of a specific underlying network technology.
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The TIPHON network and service environment model is separated into two planes that exist across the various network
domains encountered in the end-to-end communications path. The upper plane comprises the Service Application and
Service Abstraction Layers and is termed the TIPHON Application Plane. This plane addresses the implementation of
end-to-end communications applications. The lower plane includes the Transport and Network Abstraction Layers and
is termed the TIPHON Transport Plane. The TIPHON Transport Plane provides domain independent communications
capabilities to the TIPHON Application Plane. Requirements placed upon the TIPHON Transport Plane by the
TIPHON Application Plane are expressed in Service Independent Requirements documents in accordance with the
TIPHON project method [1].
The present document describes the framework for Service Capabilities in the Application Layer. The Network
Abstraction Layer and Transport Abstraction Layer are defined by sets of Service Independent Requirements and are
described elsewhere.
4.3 Service capability framework
TIPHON identifies a number of concepts when considering the TIPHON Application Plane. These are derived from a
decomposition of a service into constituent elements. TIPHON places the following meanings on the terminology used
to describe services as follows:
Service: commercial offering to a customer. It comprises functionality - known as a Service Application - set in a
business context. The business context is outside of the scope of TIPHON to consider as it determined by commercial
or political concerns.
As shown in figure 2, Service Applications are constructed in a modular fashion from Service Capabilities within the
TIPHON Service Abstraction Layer.
Service
Service Application
Service Capability
Service Capability
Service Capability
User Network
Capability Capability
Commercial Context
Figure 2: Services and Service Capabilities
Service Application: a Service Application is an integrated set of one or more Service Capabilities. TIPHON will not
specify Service Applications other than Simple Call but may consider such groupings where this contributes to the
definition of specific service capabilities. The ability to select and combine Service Capabilities offers a structured, yet
flexible, means for creating service applications that:
• are internally coherent and self consistent;
• enable the inter-operation of services between different implementations of TIPHON systems;
• enable inter-working with other systems;
• enable service providers to develop differentiated services that inter-work across multiple networks and multiple
network technologies.
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Service Capability: an indivisible and exclusive set of function
...