From Wikipedia, the free encyclopedia Service layer
Service layer
In intelligent networks (IN) and cellular networks, ser- OSA Service Capability Server
vice layer is a conceptual layer within a network service
An OSA Service Capability Server acts as a secure gateway
provider architecture. It aims at providing middleware
between the IMS network and an application which runs
that serves third-party value-added services and appli-
upon the Open Services Architecture (this is typically a
cations at a higher application layer. The service layer
SIP to Parlay gateway)
provides capability servers owned by a telecommunication
network service provider, accessed through open and se-
cure Application Programming Interfaces (APIs) by ap-
IM-SSF
plication layer servers owned by third-party content The IM-SSF (IP Multimedia Service Switching Function)
providers. The service layer also provides an interface to acts as a gateway between the IMS network and appli-
core networks at a lower resource layer[1]. The lower lay- cation servers using other telecommunication signalling
ers may also be named control layer and transport layer standards such as INAP and CAMEL.
(the transport layer is also referred to as the access layer
in some architectures).[citation needed] Service layer in SOA
The concept of service layer is used in contexts such
as Intelligent networks (IN), WAP, 3G and IP Multimedia In Service oriented architecture (SOA), the service layer
Subsystem (IMS). It is defined in the 3GPP Open Services is the third layer in a five abstraction layer model. The
Architecture (OSA) model, which reused the idea of the model consists of Object layer, Component layer, Service
Parlay API for third-party servers. layer, process layer and Enterprise layer.[3]. The service
In software design, for example Service-oriented ar- layer can be considered as a bridge between the higher
chitecture, the concept of service layer has a different and lower layers, and is characterized by a number of ser-
meaning. vices that are carrying out individual business functions.
Service layer in IMS References
The service layer of an IMS architecture provides mul- [1] Kristofer Kimbler, Service Interaction in Next
timedia services to the overall IMS network. This layer Generation Networks: Challenges and
contains network elements which connect to the Opportunities. Feature Interactions in
Serving-CSCF (Call Session Control Function) using the IP Telecommunications and Software Systems. Papers
multimedia Subsystem Service Control Interface (ISC)[2]. from the sixths International Workshop on Feature
The ISC interface uses the SIP signalling protocol. Interactions in Telecommunications and Software
Systems May 2000. Edition: illustrated. Published
Elements of the IMS service layer by: IOS Press, 2000. ISBN 1586030655,
9781586030650.
The network elements contained with in the service lay-
[2] http://www.3gpp.org/ftp/Specs/html-info/
er are generically referred to as ’service platforms’ how-
23228.htm
ever the 3GPP specification (3GPP TS 23.228 V8.7.0) de-
[3] Service-oriented Architecture Compass: Business
fines several types of service platforms:
Value, Planning, and Enterprise Roadmap. Author:
• SIP Application Server
Norbert Bieberstein, Sanjay Bose, Marc Fiammante,
• OSA Service Capability Server
Keith Jones, Rawn Shah. Edition: illustrated.
• IM-SSF
Published by: FT Press, 2005. ISBN 0131870025,
9780131870024
SIP Application Server
The SIP Application Server (AS) performs the same func-
tion as a Telephony Application Server in a pre-IMS net- See also
work, however it is specifically tailored to support the • IP Multimedia Subsystem (IMS)
SIP signalling protocol for use in an IMS network. • Open Services Architecture (OSA)
• Hierarchical internetworking model
• Multi-tier architecture
Retrieved from "http://en.wikipedia.org/w/index.php?title=Service_layer&oldid=455247730"
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From Wikipedia, the free encyclopedia Service layer
Categories:
• Application layer protocols
• Service-oriented (business computing)
• Middleware
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