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Reasons for the question
A number of Digital Subscriber Signalling System No. 1 (DSS 1) and
Digital Subscriber Signalling System No. 2 (DSS 2) Recommendations have been
developed to access narrow-band and broadband ISDN basic and supplementary
services; however, additional supplementary services which are identified need
to be specified. Similarly, the introduction of new or enhanced bearer services
may need to be supported by new or enhanced network signalling procedures and
data structures, in particular with respect to ISUP and B-ISUP. The interworking
of network signalling with access signalling protocols is considered an integral
part of the protocol specification activity.
New network architectures and services are enabling significant new technical
capabilities, which need to be fully considered in the definition of advanced
dynamic systems behaviour and supporting signalling protocol capabilities.
Included in this is the emergence of new multimedia services that have resulted
in the development of useful new concepts such as session signalling for the
control of multimedia, multiconnection services. It is necessary to reconcile
and align emerging broadband signalling capabilities, functional entities,
dynamic behaviour, etc. with emerging IN concepts and distributed computing
concepts. Furthermore, it is necessary to apply the concepts of new session
control to various services, including services for the support of multimedia
communication, distribution services, and the interactive control of services
and to take into account multinetwork distribution of the signalling control
functionality.
The introduction of new, or enhancements to, ATM traffic types and connection
configurations may need to be supported by the introduction of additional
protocol elements into the network signalling procedures and data structures.
ISDN service capabilities could be implemented by means of an IN-structured
network; it is necessary to reconcile and align signalling capabilities with
emerging IN concepts and distributed computing concepts. There exists a need for
protocols supporting broadband applications to evolve gracefully and to
interoperate with narrow-band applications. There is a need to continue to study
the application of narrow-band ISDN supplementary services in a broadband ISDN
context.
Question
What new recommendations and what enhancements to existing recommendations
are required in order to:
a) provide the protocols needed to support the provision and evolution of
basic and supplementary services and network features offered in narrow-band
and broadband ISDN networks;
b) support additional ATM traffic types and configurations; and
c) support advanced multimedia applications and services?
Task objectives
1) Maintain existing Recommendations in the H.2xx, H.3xx, H.4xx, Q.7xx,
Q.9xx, Q.26xx (except for Q.2630.1), Q.27xx and Q.29xx-series.
1.1) Re-issue ISDN user-network interface layer 3 specification for basic
call control (Q.931), taking into account all new codepoints assigned and,
if needed, corrections to errors.
Expected completion: 2H2002.
1.2) Revise the Stage 3 description for multiparty supplementary services
using DSS 1 (Q.954) Conference Calling to harmonize with the H-series
Recommendations.
Expected completion: 2H2002
1.3) Specify the testing of DSS 1/ISUP interworking as defined in Q.699.
Expected completion: 2H2001.
2) In response to requirements identified in other questions (e.g. H and
L) for new network capabilities and services, enhance existing and/or create
new Recommendations in the H.2xx, H.3xx, H.4xx, Q.7xx, Q.9xx, Q.26xx (except
Q.2630.1), Q.27xx and Q.29xx-series. Among these enhancements are:
2.1) Identification of calls to a mobile network.
Expected completion: 2H2001.
2.2) Support of optimal concatenation of DME.
Expected completion: 2H2001.
2.3) IN/ISUP interaction for INAP Capability Sets 3 and 4.
Expected completion: 2H2001.
2.4) Enhance Q.932, Generic procedures for the control of ISDN
supplementary services, to support Generic Functional transport.
Expected completion: 2H2002.
2.5) Specify Generic Functional Transport Control, including its support
for existing Generic Functional Terminals and Stimulus Terminals in an IN
environment and including narrow-band and broadband aspects.
Expected completion: 2H2002.
2.6) Create an IN/DSS 1 Integration Roadmap and General Overview and
specify DSS 1/INAP interworking.
Expected completion: 2H2002.
2.7) Revise B-ISUP (Q.2766) to incorporate assignment changes for
Switched Virtual Path Capability (SVPC).
Expected completion: 2H2000.
2.8) Revise B-ISUP (Q.2767) to specify signalling control for soft
permanent virtual path/channel connections (SVPC/SVCC).
Expected completion: 2H2000
2.9) Revise Q.2961 to include all subparts and to support additional
traffic parameters.
Expected completion: 2H2001.
3) Produce the necessary information for Protocol Implementation
Conformance Statements (PICS) with the support of the testing question
(Question Q), if required. To assist the test generation the extensive
usage of formal description techniques (e.g. SDL, ASN.1) is encouraged.
Expected completion: Ongoing.
Relationships
The tasks of this question are related to the specification of U-plane and
C-plane protocols that support or use N-ISDN or B-ISDN. Specification in this
area is related also to ITU-T efforts with ITU-T H-series Recommendations, e.g.
H.323 and H.248. Bearer control signalling, including AAL type 2 signalling, is
covered in Question 15/11.
This question is related to other organizations defining services and
applications of narrow-band and broadband ISDN. Similarly, consideration of
other network requirements, such as performance, numbering, addressing, security
and operations must be included in this question.
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