SIST EN 302 093-1 V1.1.1:2005

• Abstract:

  Procedures for establishing, maintaining and clearing of point-to-poin t bearer connections within an already established multiconnection cal l in the context of separation of call control and bearer connection c ontrol, applicable at the public B-ISDN UNI (TB and coincident SB and TB reference points)

• Status: Published
• Publication Date: 31-Dec-2004
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2005
• Due Date: 01-Jan-2005
• Completion Date: 01-Jan-2005
• Ref Project: ETSI EN 302 093-1 V1.1.1 (2000-06) - Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Point-to-point multiconnection bearer control specification in a separated call and bearer environment; Part 1: Protocol specification

SIST EN 302 093-1 V1.1.1:2005 is the Slovenian adoption of ETSI EN 302 093-1 V1.1.1, a European telecommunications standard for the Broadband Integrated Services Digital Network (B-ISDN) Digital Subscriber Signalling System No. two (DSS2) protocol. It specifies how to establish, maintain, and clear point-to-point bearer connections inside a multiconnection call when call control and bearer control are separated, for use at the public B-ISDN User-Network Interface (UNI).

The document is aimed at B-ISDN terminal equipment, customer networks, and public network implementations that need to keep each bearer under separate control while still tying it to one multiconnection call.

What does SIST EN 302 093-1 V1.1.1:2005 specify?

SIST EN 302 093-1 V1.1.1:2005 specifies the bearer-control side of point-to-point multiconnection calls at the B-ISDN UNI. It focuses on the procedures, messages, and information elements used when call control and bearer control are separated.

The scope covers the interface between a B-ISDN terminal equipment and a public network at the coincident S and T reference point, and between a B-ISDN customer network and a public network at the T reference point. The document is organized into clauses for scope, references, definitions, abbreviations, description, operational requirements, primitives and state definitions, coding requirements, signalling procedures, interworking, supplementary services, parameter values, and SDLs.

Annex	What it covers
Annex A	Guidelines for setting the instruction indicator in the call association and bearer identifier information elements
Annex B	How the bearer identifier and call association are used at the user-network interface

What are the key requirements of SIST EN 302 093-1 V1.1.1:2005?

The core requirement is that bearer connections for a multiconnection call are controlled separately from the call itself. Clause 5 explains that each bearer can be set up or released independently, which matters in practice because one call can carry several bearers without changing the call state.

Bearer setup and release

Clause 5 says new bearer connections are added with SETUP messages and removed with RELEASE messages. Multiple bearer setups and multiple bearer releases can be outstanding in parallel, so implementations do not need to serialize bearer changes one by one.

Clause 9 adds that bearer establishment can start as soon as the multiconnection call is in progress, and that bearer clearing does not affect the call state. This lets an implementation add or remove traffic paths while keeping the call alive.

Message content and identifiers

Clause 8 modifies the SETUP message so that it carries a call association and, when needed, a bearer identifier. In practice, this is what links each bearer request to the right multiconnection call and to the right bearer object.

Clause 8 also states that the call association carries either a call identifier or a call segment identifier, not both. The bearer identifier is a 23-bit value with a direction flag, and it is used only between the peer control entities involved in that bearer.

Procedures at the UNI

Clause 9 defines what the preceding and succeeding sides do when a bearer is established across the coincident S and T reference point. If a bearer request refers to an unrecognized call association, the receiving side rejects it with a release-complete response.

Clause 9 also explains the forwarding behavior when a side is not a point of call/bearer coordination. That matters for implementations that relay bearer requests across intermediate entities before the request reaches the local call control user.

Interaction with the base protocol

Clause 7 says the bearer-control state definitions coincide with those in EN 300 443-1, and no additional primitives are defined between DSS2 layer 3 and the Signalling ATM Adaptation Layer (SAAL). The base protocol therefore remains the reference for the common call-control behavior.

Clause 8 and clause 14 both build on EN 300 443-1: the message coding rules follow its principles, and no extra SDLs are required beyond those in its annex A. Clause 13 likewise states that no additional parameter values are needed.

What terms does SIST EN 302 093-1 V1.1.1:2005 define?

• B-ISDN - Broadband Integrated Services Digital Network; the broadband ISDN environment in which the protocol operates.
• DSS2 - Digital Subscriber Signalling System No 2; the signalling system used for the protocol.
• SAAL - Signalling ATM Adaptation Layer; the layer 2 service used by the layer 3 procedures.
• UNI - User-Network Interface; the interface between terminal or customer equipment and the public network.
• connection state - The state of a connection as known by the layer 3 Bearer Control entity.
• call association - The identifier that ties a bearer establishment request to a multiconnection call between peer call control entities.
• bearer identifier - The identifier that ties a bearer establishment request to a specific bearer instance within a call.
• preceding side / succeeding side - The side that sends a bearer establishment request across an interface, and the opposite side that receives it.

Who uses SIST EN 302 093-1 V1.1.1:2005?

SIST EN 302 093-1 V1.1.1:2005 is used by designers and implementers of B-ISDN terminal equipment, customer networks, and public network signalling systems. It is also relevant to protocol testers and interoperability engineers who need to verify bearer setup, bearer release, and identifier handling at the UNI.

Network operators and suppliers use it when they support multiconnection call capability, especially where call control is separated from bearer control. The document also matters to quality and conformance teams working against the DSS2 protocol stack.

Which standards are used with SIST EN 302 093-1 V1.1.1:2005?

• EN 300 443-1 - The base DSS2 protocol for basic call/bearer control; this standard builds on it and reuses its call state, message, and coding framework.
• ETS 300 437-1 - Defines the SAAL primitives used to illustrate layer 3 to layer 2 communication.
• EN 301 068-1 - Provides the ATM transfer capability and traffic parameter indication used independently for each bearer.
• ETS 301 067-1 - Provides traffic parameter negotiation during call and connection establishment.
• ETS 301 003-1 - Provides peak cell rate modification by the connection owner.
• EN 302 091-1 - Covers prenegotiation, named in the reference list as a related DSS2 and B-ISDN standard.
• ITU-T Recommendation I.413 - Defines the B-ISDN user-network interface structure used by the bearer control procedures.
• ITU-T Recommendation Q.2961 - Cited in the bibliography as supporting information on additional traffic parameters.

What does the SIST EN 302 093-1 V1.1.1:2005 document contain?

The document gives the protocol description, operational rules, message coding, and signalling procedures needed for separated bearer control. It includes coding for the SETUP message additions, the call association information element, and the bearer identifier information element, with bit-format figures and coding tables.

It also contains step-by-step signalling behavior at the coincident S and T reference point and at the T reference point, plus the rules for forwarding, rejecting, and clearing bearer requests. Annex A provides instruction-indicator guidance, and Annex B explains how call association and bearer identifier values relate call objects and bearer objects at the UNI.

SLOVENSKI STANDARD
01-januar-2005
âLURNRSDVRYQRGLJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL%,6'1±3URWRNRO
GLJLWDOQHQDURþQLãNHVLJQDOL]DFLMHãW'66±6SHFLILNDFLMDNUPLOMHQMD
YHþ]YH]QHJDQRVLOFDRGWRþNHGRWRþNHYRNROMXNMHUVWDNOLFLQQRVLOHFORþHQD±
GHO6SHFLILNDFLMDSURWRNROD
Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling
System No. two (DSS2) protocol; Point-to-point multiconnection bearer control
specification in a separated call and bearer environment; Part 1: Protocol specification
Ta slovenski standard je istoveten z: EN 302 093-1 Version 1.1.1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

European Standard (Telecommunications series)
Broadband Integrated Services Digital Network (B-ISDN);
Digital Subscriber Signalling System No. two (DSS2) protocol;
Point-to-point multiconnection bearer control specification
in a separated call and bearer environment;
Part 1: Protocol specification

2 ETSI EN 302 093-1 V1.1.1 (2000-06)
Reference
DEN/SPS-05133-1
Keywords
bearer, B-ISDN, DSS2, layer 3, protocol, UNI
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.:[phone] Fax:[phone]
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
Individual copies of the present document can be downloaded from:
http://www.etsi.org
The present document may be made available in more than one electronic version or in print. In any case of existing or
perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF).
In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive
within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at http://www.etsi.org/tb/status/
If you find errors in the present document, send your comment to:
[e-mail]
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2000.
All rights reserved.
ETSI
3 ETSI EN 302 093-1 V1.1.1 (2000-06)
Contents
Intellectual Property Rights.5
Foreword.5
1 Scope .6
2 References .6
3 Definitions.7
4 Abbreviations .7
5 Description .7
5.1 Application to interface structure .7
5.2 Capabilities supported by the present document .7
5.3 General overview .8
6 Operational requirements .8
6.1 Provision and withdrawal.8
6.2 Requirements on the originating network side .8
6.3 Requirements on the destination network side .8
7 Primitive definitions and state definitions.8
7.1 Primitive definitions.8
7.2 State definitions.9
8 Coding requirements .9
8.1 Messages .9
8.1.1 Modification to messages defined in EN 300 443-1.9
8.1.1.1 SETUP .9
8.1.1.2 Other messages .10
8.2 Information elements.10
8.2.1 Call association.10
8.2.2 Bearer identifier .11
8.2.3 Other information elements .11
9 Signalling procedures at the coincident S and T reference point .12
b b
9.1 Introduction .12
9.2 Establishment of a bearer .12
9.2.1 Additional procedures at a preceding side .12
9.2.1.1 Additional procedures at a preceding side that is a point of call/bearer coordination.12
9.2.1.2 Additional procedures at a preceding side that is not a point of call/bearer coordination.13
9.2.2 Additional procedures at a succeeding side .13
9.2.2.1 Additional procedures at a succeeding side that is not a point of call/bearer coordination.13
9.2.2.2 Additional procedures at a succeeding side that is a point of call/bearer coordination.13
9.3 Clearing of a connection.13
ETSI
4 ETSI EN 302 093-1 V1.1.1 (2000-06)
10 Signalling procedures at the T reference point.14
b
11 Interworking with other networks .14
12 Interactions with supplementary services.14
13 Parameter values .14
14 Dynamic description SDLs .14
Annex A (informative): Guidelines for the use of the instruction indicator .15
Annex B (informative): Significance and use of the bearer identifier and call association at
the user-network interface .16
Bibliography.17
History .18
ETSI
5 ETSI EN 302 093-1 V1.1.1 (2000-06)
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 European Standard (Telecommunications series) has been produced by ETSI Technical Committee Signalling
Protocols and Switching (SPS).
The present document is part 1 of a multi-part standard covering the Digital Subscriber Signalling System No. two
(DSS2) protocol; Point-to-point multiconnection bearer control specification in a separated call and bearer environment,
as described below:
Part 1: "Protocol specification;
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification for the user";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the user".
The Protocol specification, of the present document, builds upon the basic call control procedures defined in
EN 300 443-1 [5] by adding protocol elements and procedures required to enable separate call and bearer control.
National transposition dates
Date of adoption of this EN: 5 May 2000
Date of latest announcement of this EN (doa): 31 August 2000
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 28 February 2001
Date of withdrawal of any conflicting National Standard (dow): 28 February 2001
ETSI
6 ETSI EN 302 093-1 V1.1.1 (2000-06)
1 Scope
The present document specifies the procedures for establishing, maintaining and clearing of bearer connections to point-
to-point multiconnection calls at the B-ISDN user-network interface.
It specifies the essential features, procedures, and messages required for controlling bearer connections associated to
point-to-point multiconnection calls in a functionally separated call and bearer control environment.
The procedures specified by the present document are applicable at the interface between a B-ISDN terminal equipment
and a B-ISDN public network (coincident S and T reference point) as well as at the interface between a B-ISDN
b b
customer network and a B-ISDN public network (i.e. at the T reference point).
b
The separated bearer control protocol defined by the present document is applicable to control bearers associated to a
multiconnection call which is controlled independently by means of a separate call control protocol.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication, edition number, version number, etc.) or non-
specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, subsequent revisions do apply.
• A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
[1] ETSI EN 302 091-1: "Broadband Integrated Services Digital Network (B-ISDN) and Broadband
Private Integrated Services Network (B-PISN); Digital Subscriber Signalling System No. two
(DSS2), Broadband Inter-Exchange Signalling (B-QSIG), and Signalling System No. 7 (SS7);
Prenegotiation; Part 1: Protocol specification".
[2] ETSI ETS 300 437-1: "Broadband Integrated Services Digital Network (B-ISDN); Signalling
ATM Adaptation Layer (SAAL); Service Specific Co-ordination Function (SSCF) for support of
signalling at the User-Network Interface (UNI); Part 1: Specification of SSCF at UNI [ITU-T
Recommendation Q.2130 (1995), modified]".
[3] ETSI ETS 301 067-1: "Broadband Integrated Services Digital Network (B-ISDN); Digital
Subscriber Signalling System No. two (DSS2) protocol; Connection characteristics; Negotiation
during call/connection establishment phase; Part 1: Protocol specification [ITU-T
Recommendation Q.2962 (1996), modified]".
[4] ETSI ETS 301 003-1: "Broadband Integrated Services Digital Network (B-ISDN); Digital
Subscriber Signalling System No. two (DSS2) protocol; Connection characteristics; Peak cell rate
modification by the connection owner; Part 1: Protocol specification [ITU-T Recommendation
Q.2963.1 (1996), modified".
[5] ETSI EN 300 443-1: "Broadband Integrated Services Digital Network (B-ISDN); Digital
Subscriber Signalling System No. two (DSS2) protocol; B-ISDN user-network interface layer 3
specification for basic call/bearer control; Part 1: Protocol specification [ITU-T Recommendation
Q.2931 (1995), modified]".
[6] ITU-T Recommendation I.413: "B-ISDN user-network interface".
[7] ETSI EN 301 068-1: "Broadband Integrated Services Digital Network (B-ISDN); Digital
Subscriber Signalling System No. two (DSS2) protocol; Connection characteristics; ATM transfer
capability and traffic parameter indication; Part 1: Protocol specification [ITU-T
Recommendations Q.2961.1 (1995), Q.2961.2 (1997), Q.2961.3 (1997), Q.2961.4 (1997),
modified]".
ETSI
7 ETSI EN 302 093-1 V1.1.1 (2000-06)
3 Definitions
For the purposes of the present document, the following terms and definitions apply:
connection state: state for each connection (see subclause 7.2) which is known by the layer 3 Bearer Control entity.
The different Connection states correspond to the call/connection states defined in clause 2 of EN 300 443-1 [5], i.e. the
states of the Q.2931 protocol entities on both sides of the UNI and relate to each call associated bearer.
bearer identifier: identifier used to identify a bearer instance to which a particular bearer establishment request relates
between two CC entities. The value of the bearer identifier is significant between two adjacent CC entities. The value is
unique within a call between two adjacent CC entities.
call association: identifier used to identify a multiconnection call instance to which a particular bearer establishment
request relates between two CC entities. The value of a call identifier is significant between two adjacent call control
entities. The value carried in the call association is significant between two adjacent CC entities.
preceding side: with respect to a given bearer, the side of an interface between two bearer control entities from which
bearer establishment across the interface originates.
succeeding side: with respect to a given bearer, the side (opposite to the preceding side) of an interface between two
bearer control entities which receives bearer establishment request across the interface.
4 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ATM Asynchronous Transfer Mode
BC Bearer Control
CC Call Control
B-ISDN Broadband Integrated Services Digital Network
DSS2 Digital Subscriber Signalling System No 2
SAAL Signalling ATM Adaptation Layer
SDL Specification and Description Language
UNI User-Network Interface
5 Description
5.1 Application to interface structure
The bearer control procedures apply to the interface structures defined in ITU-T Recommendation I.413 [6]. They use
the functions and services provided by layer 2 (i.e. the SAAL). The layer 3 procedures request the services of layer 2
and receive information from layer 2 using the primitives defined in ETS 300 437-1 [2]. These primitives are used to
illustrate the communication between the protocol layers and are not intended to specify or constrain implementations.
5.2 Capabilities supported by the present document
The present document builds upon the basic point-to-point combined call/bearer control protocol defined in
EN 300 443-1 [5] to enable the separate control of bearers being associated to a multiconnection call.
ETSI
8 ETSI EN 302 093-1 V1.1.1 (2000-06)
5.3 General overview
The present document provides the procedures, messages and information elements needed for establishing,
maintaining and clearing of bearer connections being associated with a point-to-point multiconnection call.
After a multiconnection call has been initiated or has progressed to the active state, bearer connections can be added to
the call by individual bearer connection set-up requests from the calling party or the called party, using the separated
bearer control protocol specified in the present document, which is based on the procedures in EN 300 443-1 [5]. Each
new connection establishment request shall use a new call reference (see clause 4 of EN 300 443-1 [5]). Bearers may be
established or released from the multiconnection call at any time while not modifying the call state. New connections
can be established by the calling party or the called party by sending a SETUP message as defined in EN 300 443-1 [5],
which in addition contains the call association information element in order to associate that bearer with the
multiconnection call. Connections may be released from the call by the calling party or the called party by sending a
RELEASE message as defined in EN 300 443-1 [5].
The individual bearers are controlled independently. In particular, multiple bearer connection establishment requests
may be initiated in parallel (i.e. the requesting party does not need to wait for a response related to one bearer
connection set-up request before issuing another one). Similarly, multiple bearer connection release requests may be
pending at the same tim
...