SIST EN 300 138-6 V1.4.5:2003

SLOVENSKI STANDARD
01-december-2003
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Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary
service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 6: Abstract
Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification for the network
Ta slovenski standard je istoveten z: EN 300 138-6 Version 1.4.5
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)
Integrated Services Digital Network (ISDN);
Closed User Group (CUG) supplementary service;
Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 6: Abstract Test Suite (ATS) and partial Protocol
Implementation eXtra Information for Testing (PIXIT)
proforma specification for the network
�
2 ETSI EN 300 138-6 V1.4.5 (1999-11)
Reference
REN/SPS-05163-6 (1a1i0jfc.PDF)
Keywords
ISDN, DSS1, supplementary services, CUG,
ATS, PIXIT, network
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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 1999.
All rights reserved.
ETSI
3 ETSI EN 300 138-6 V1.4.5 (1999-11)
Contents
Intellectual Property Rights.5
Foreword .5
1 Scope.6
2 References.6
3 Definitions and abbreviations .7
3.1 Definitions.7
3.2 Abbreviations .8
4 Abstract Test Method (ATM) .8
4.1 Description of ATM used.8
4.1.1 Conventions for test components and PCOs .9
4.1.2 Conventions for variables and parameters .10
4.2 Alternative ATM .10
5 Untestable test purposes.11
6 ATS conventions.11
6.1 Declarations part .11
6.1.1 Type definitions .11
6.1.1.1 Simple type definitions.11
6.1.1.2 Structured type definitions .12
6.1.1.2.1 TTCN structured type definitions.12
6.1.1.2.2 ASN.1 structured type definitions.12
6.1.1.3 ASP type definitions.13
6.1.1.3.1 TTCN ASP type definitions.13
6.1.1.3.2 ASN.1 ASP type definitions .13
6.1.1.4 PDU type definitions.13
6.1.1.4.1 TTCN PDU type definitions.13
6.1.1.4.2 ASN.1 PDU type definitions .13
6.1.2 Test suite constants .13
6.1.3 Test suite parameters .14
6.1.4 Variables.14
6.1.4.1 Test suite variables.14
6.1.4.2 Test case variables .14
6.1.5 Test suite operation definitions.14
6.2 Constraints part.14
6.2.1 Structured type constraint declaration.14
6.2.2 ASN.1 type constraint declaration .15
6.2.2.1 Specification of encoding rules .15
6.2.3 ASP type constraint declaration.15
6.2.3.1 ASN.1 ASP type constraint declaration .15
6.2.3.2 TTCN ASP type constraint declaration.15
6.2.4 PDU type constraint declaration .15
6.2.4.1 ASN.1 PDU type constraint declaration.15
6.2.4.2 TTCN PDU type constraint declaration .15
6.2.5 Chaining of constraints .15
6.2.5.1 Static chaining.15
6.2.5.2 Dynamic chaining.15
6.2.6 Derived constraints .16
6.2.7 Parameterized constraints .16
6.2.8 Value assignment.16
6.2.8.1 Specific values .16
6.2.8.2 Matching values .16
6.3 Dynamic part .16
ETSI
4 ETSI EN 300 138-6 V1.4.5 (1999-11)
6.3.1 Test cases.16
6.3.2 Test steps .17
6.3.2.1 PTC1_IN.17
6.3.2.2 PTC1_OUT.17
6.3.3 Defaults.17
7 ATS to TP map.17
8 PCTR conformance.17
9 PIXIT conformance.17
10 ATS conformance .18
Annex A (normative): Protocol Conformance Test Report (PCTR) proforma.19
A.1 Identification summary .19
A.1.1 Protocol conformance test report.19
A.1.2 IUT identification.19
A.1.3 Testing environment.20
A.1.4 Limits and reservations.20
A.1.5 Comments.20
A.2 IUT conformance status .20
A.3 Static conformance summary.20
A.4 Dynamic conformance summary.21
A.5 Static conformance review report .21
A.6 Test campaign report.22
A.7 Observations.23
Annex B (normative): Partial PIXIT proforma.24
B.1 Identification summary .24
B.2 Abstract test suite summary .24
B.3 Test laboratory .24
B.4 Client (of the test laboratory).25
B.5 System Under Test (SUT).25
B.6 Protocol information .26
B.6.1 Protocol identification .26
B.6.2 Parameter values.26
B.6.3 Configuration of IUT.28
B.6.4 Parameter values - information element codings.28
B.6.5 Parameter values - information elements received from IUT .28
B.6.6 CUG features.28
B.6.7 Timer values.29
B.7 Basic call PIXIT items .29
B.7.1 Parameter values - information element codings.29
Annex C (normative): Abstract Test Suite (ATS).30
C.1 The TTCN Graphical form (TTCN.GR).30
C.2 The TTCN Machine Processable form (TTCN.MP) .30
Annex D (informative): General structure of ATS.31
History.32
ETSI
5 ETSI EN 300 138-6 V1.4.5 (1999-11)
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 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 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 6 of a multi-part standard covering the Digital Subscriber Signalling System No. one
(DSS1) protocol specification for the Integrated Services Digital Network (ISDN) Closed User Group (CUG)
supplementary service, 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";
Part 5: "Test Suite Structure and Test Purposes (TSS&TP) specification for the network";
Part 6: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification for the network".
The present version updates the references to the basic call specifications.
National transposition dates
Date of adoption of this EN: 29 October 1999
Date of latest announcement of this EN (doa): 31 January 2000
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 July 2000
Date of withdrawal of any conflicting National Standard (dow): 31 July 2000
ETSI
6 ETSI EN 300 138-6 V1.4.5 (1999-11)
1 Scope
This sixth part of EN 300 138 specifies the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra
Information for Testing (PIXIT) proforma for the Network side of the T reference point or coincident S and T reference
point (as defined in ITU-T Recommendation I.411 [10]) of implementations conforming to the stage three standard for
the Closed User Group (CUG) supplementary service for the pan-European Integrated Services Digital Network (ISDN)
by means of the Digital Subscriber Signalling System No. one (DSS1) protocol, EN 300 138-1 [2].
EN 300 138-5 [4] specifies the Test Suite Structure and Test Purposes (TSS&TP) related to this ATS and partial PIXIT
proforma specification. Other parts specify the TSS&TP and the ATS and partial PIXIT proforma for the User side of
the T reference point or coincident S and T reference point of implementations conforming to EN 300 138-1 [2].
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, the latest version applies.
• 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] EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System
No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control;
Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[2] EN 300 138-1 (V1.3): "Integrated Services Digital Network (ISDN); Closed User Group (CUG)
supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[3] EN 300 138-2 (V1.3): "Integrated Services Digital Network (ISDN); Closed User Group (CUG)
supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification".
[4] EN 300 138-5 (V1.3): "Integrated Services Digital Network (ISDN); Closed User Group (CUG)
supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 5: Test
Suite Structure and Test Purposes (TSS&TP) specification for the network".
[5] ISO/IEC 9646-1: "Information technology - Open Systems Interconnection - Conformance testing
methodology and framework - Part 1: General concepts".
[6] ISO/IEC 9646-2: "Information technology - Open Systems Interconnection - Conformance testing
methodology and framework - Part 2: Abstract test suite specification".
[7] ISO/IEC 9646-3: "Information technology - Open Systems Interconnection - Conformance testing
methodology and framework - Part 3: The Tree and Tabular Combined Notation (TTCN)".
[8] ISO/IEC 9646-4: "Information technology - Open Systems Interconnection - Conformance testing
methodology and framework - Part 4: Test realization".
[9] ISO/IEC 9646-5: "Information technology - Open Systems Interconnection - Conformance testing
methodology and framework - Part 5: Requirements on test laboratories and clients for the
conformance assessment process".
[10] ITU-T Recommendation I.411 (1993): "ISDN user-network interfaces - Reference configurations".
ETSI
7 ETSI EN 300 138-6 V1.4.5 (1999-11)
[11] CCITT Recommendation X.209 (1988): "Specification of basic encoding rules for Abstract Syntax
Notation One (ASN.1)".
[12] EN 300 196-1: "Integrated Services Digital Network (ISDN); Generic functional protocol for the
support of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
Abstract Test Suite (ATS): see ISO/IEC 9646-1 [5]
Implementation Under Test (IUT): see ISO/IEC 9646-1 [5]
Lower Tester (LT): see ISO/IEC 9646-1 [5]
Point Of Control And Observation (PCO): see ISO/IEC 9646-1 [5]
Protocol Implementation Conformance Statement (PICS): see ISO/IEC 9646-1 [5]
PICS proforma: see ISO/IEC 9646-1 [5]
Protocol Implementation Extra Information For Testing (PIXIT): see ISO/IEC 9646-1 [5]
PIXIT proforma: see ISO/IEC 9646-1 [5]
System Under Test (SUT): see ISO/IEC 9646-1 [5]
UpperTester(UT): see ISO/IEC 9646-1 [5]
ETSI
8 ETSI EN 300 138-6 V1.4.5 (1999-11)
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ASP Abstract Service Primitive
ATM Abstract Test Method
ATS Abstract Test Suite
BER Basic Encoding Rules
CM Co-ordination Message
CP Co-ordination Point
CUG Closed User Group
ExTS Executable Test Suite
IA Incoming Access
ICB Incoming Calls Barred
IUT Implementation Under Test
LT Lower Tester
MOT Means Of Testing
MTC Main Test Component
OA Outgoing Access
OCB Outgoing Calls Barred
PCO Point of Control and Observation
PCTR Protocol Conformance Test Report
PDU Protocol Data Unit
PICS Protocol Implementation Conformance Statement
PIXIT Protocol Implementation eXtra Information for Testing
PTC Parallel Test Component
SUT System Under Test
TP Test Purpose
TTCN Tree and Tabular Combined Notation
UDI Unrestricted Digital Information
UT Upper Tester
4 Abstract Test Method (ATM)
4.1 Description of ATM used
The requirement for testing the network IUT is to focus on the behaviour of the network IUT at the user-network
interface where a T reference point or coincident S and T reference point applies. Thus the IUT is the network DSS1
protocol entity at a particular user-network interface and is not the whole network.
It is possible to specify an ATS based on a Single party (remote) test method for such an IUT. However, it is considered
that an ATS based on such an approach is of limited use as the only way to specify IUT generated PDUs is to use the
"implicit send" statement. Many users of such an ATS would replace the "implicit send" statements with descriptions of
the behaviour at other interfaces.
An ATS based on a multi-party test method is considered to be more useful in that it is closer to how a real test suite
would be constructed. Such a test method specifies behaviour at multiple network interfaces. One very important
limitation here is that tests are focused on one particular interface. Thus the test system is made up one Main Test
Component (MTC) and one or more Parallel Test Components (PTC), see figure 1.
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9 ETSI EN 300 138-6 V1.4.5 (1999-11)
4.1.1 Conventions for test components and PCOs
Master part Slave part
MTCA
PTC1
CPA1
L0 PCO L1 PCO
IUT
NETWORK
Figure 1: Multi-party test method
In a master/slave arrangement, the MTC is considered to be the master while the PTCs are the slaves. The "slave" testers
are only an explicit description of how to deal with the "other" interfaces during the testing process, i.e. "how to make
the IUT send the required message".
This means, in particular, that the verdict will only be assigned from the protocol aspects observed on the interface
under test (i.e. by the "master" tester), as it would be observed by a terminal connected to this interface. A failure in the
correlation between the protocol at the different interfaces to which the different testers are connected, i.e. in the
mechanism of the functional service itself, will not cause a FAIL verdict. For instance, if the IUT fails to send a message
on the tested interface after another interface has received the proper stimulus, the verdict will be INCONCLUSIVE.
The MTC MTCA has two functions in this configuration. Firstly, it has the MTC function of controlling the one or more
PTCs. Thus it is responsible for starting the PTCs and afterwards co-ordinates activities by exchanging Co-ordination
Messages (CM) with the PTCs. Secondly it is responsible for the behaviour of the Lower Tester (LT) at PCO L0.
A combination of the remote and multi-party test methods is applied. As can be seen from figure 1, several PCOs are
used. All PCOs reside at the service access points between layers 2 and 3.
ETSI
10 ETSI EN 300 138-6 V1.4.5 (1999-11)
SUT
MTC PTC1
Layer 3 IUT Layer 3
  
L0    L1
Layer 2 Layer 2
 

 
    
Layer 1 Layer 1
Service provider
Figure 2: Combination of the remote and multi-party test methods
The MTC PCO is named "L0" ("L" for Lower). PCO L0 is used to control and observe the behaviour of the IUT and
test case verdicts are assigned depending on the behaviour observed at this PCO. The PTC PTC1 uses PCO L1. This
PCO is used to control and, in a limited way, observe the behaviour of the network equipment at interfaces other than
the one under test. No verdicts are assigned at this PCO.
As stated in a previous paragraph, the non-receipt of network generated messages at L0, which are stimulated by events
at the L1, will result in INCONCLUSIVE rather than FAIL verdicts being assigned.
4.1.2 Conventions for variables and parameters
MTCA
call reference CREF1
B channel (basic) bch_num1 (to PTC1)
channel nr (primary) CH_NUM1
PCO L0 IPN0, LIPN0
PTC1
call reference P1CREF
B channel (basic) P1_bch_num
channel nr (primary) P1_CH_NUM
PCO L1 IPN1, LIPN1
4.2 Alternative ATM
As stated in subclause 4.1, an ATS based on a single-party (remote) ATM is possible. Such an ATS may be generated
from the one specified in the present document. The following general steps should be taken:
1) remove all PTC behaviour;
2) remove all CREATE statements;
3) replace CMs which are used to provoke PDUs at the MTC, with implicit send statements.
An example, showing the difference between the multi-party ATM and single-party ATM for a single test case, is given
in tables 1 and 2.
ETSI
11 ETSI EN 300 138-6 V1.4.5 (1999-11)
Table 1: Test case dynamic behaviour table using multi-party ATM
TEST CASE DYNAMIC BEHAVIOUR
Test Case Name HOLD_N04_001
Group RemoteUser_ST_OR_T/Holding/
Purpose Ensure that the IUT, while in the Active call state N10, to notify
the non-served user that the call is held
sends a NOTIFY message with a notification indicator coded as
"remote hold" to user B and remains in the Active call state.
Default DF69901(1)
Configuration CONFIG1
Comments 9.2.1 valid optional
Nr | Label| BEHAVIOUR DESCRIPTION | CREF | V | COMMENTS
1 | |CREATE ( PTC1: PTC1_IN_servedUser) | | |
2 | | +PR31002 | | |preamble N10
3 | | CPA1!CP_M START TWAIT |S_HL | |
4 | | L0?NOTIFYr |A_NO20(CREF1,hold_NID) |(P)|
5 | | +CS59901(10,1) | | |check N10
6 | | ?TIMEOUT TWAIT | |(I)|
7 | | +PO49901(1) | | |postamble N0
DETAILED COMMENTS:
Table 2: Test case dynamic behaviour table using single-party ATM
TEST CASE DYNAMIC BEHAVIOUR
Test Case Name HOLD_N04_001
Group RemoteUser_ST_OR_T/Holding/
Purpose Ensure that the IUT, while in the Active call state N10, to notify
the non-served user that the call is held
sends a NOTIFY message with a notification indicator coded as
"remote hold" to user B and remains in the Active call state.
Default DF69901(1)
Configuration
Comments 9.2.1 valid optional
Nr | Label| BEHAVIOUR DESCRIPTION | CREF | V | COMMENTS
1 | |+PR31002 | | |preamble N10
2 | | |NO20(CREF1,hold_NID) | |
3 | | L0?NOTIFYr |A_NO20(CREF1,hold_NID) |(P)|
4 | | +CS59901(10,1) | | |check N10
5 | | ?TIMEOUT TWAIT | |(I)|
6 | | +PO49901(1) | | |postamble N0
DETAILED COMMENTS:
5 Untestable test purposes
There are no untestable test cases associated with this ATS and ATM.
6 ATS conventions
This clause is structured similarly to the structure of a TTCN ATS. However, the names of the subclauses are arranged
in a way more suitable to the present document.
6.1 Declarations part
6.1.1 Type definitions
6.1.1.1 Simple type definitions
Where appropriate, simple types have a length, a value list or a range restriction attached.
Simple types defined as being of some string type (e.g. BIT STRING, OCTET STRING), have a length restriction or a
value list attached.
ETSI
12 ETSI EN 300 138-6 V1.4.5 (1999-11)
Simple types, defined as being of INTEGER type, have a value list or a range restriction attached.
6.1.1.2 Structured type definitions
6.1.1.2.1 TTCN structured type definitions
All structured type definitions are provided with a full name.
All elements in every structured type definition, defined as being of some string type (e.g. BIT STRING,
OCTET STRING), have a length restriction attached.
If an element in a structured type definition is defined as being of a referenced type, the (possible) restriction is defined
in that referenced type.
For information elements the identifier, which is unique for each element, has its type defined as a simple type where the
value list is restricted to the single value which is the identifier itself. This has the advantage that it allows a test system
derived from this ATS to easily identify information elements embedded in messages. An ATS where information
element identifiers are represented as unrestricted types can present difficulties for a derived test system in the case
where it needs to find one information element embedded in a number of others and the constraints for the other
elements have the any-or-omit value. In such a case the test system cannot easily find the beginning of each information
element.
6.1.1.2.2 ASN.1 structured type definitions
ASN.1 has been used for two major reasons. First, types defined in ASN.1 can model problems that "pure" TTCN
cannot. For instance, data structures modelling ordered or unordered sequences of data are preferably defined in ASN.1.
Second, ASN.1 provides a better restriction mechanism for type definitions by using sub-type definitions.
The fact that ASN.1 provides a better restriction mechanism for type definitions is used for the purpose of achieving
type-compatibility.
Tables 3 and 4 show the typical use of ASN.1. The FIE type in table 3 is written in ASN.1 to permit the use of the SET
OF construction in the components field. Constraints of the FIE type can therefore be written using the SUPERSET
function which allows to match a single component which may be delivered together with a set of other components.
Table 4 shows the reject component type which is defined following the ASN.1 declaration in EN 300 196-1 [12].
Table 3: ASN.1 type definition FIE
ASN.1 Type Definition
Type Name: FIE
Comments: Facility information element taken from EN 300 196; 11.2.2.1.
Specified here for both send & receive event.
Type Definition
SEQUENCE {
informationElementIdentifier FIE_I,
length FIE_LengthType,
extBit BIT STRING (SIZE (1)),
spareBits BIT STRING (SIZE (2)),
protocolProfile BIT STRING (SIZE (5)),
components SET OF Component }
Table 4: ASN.1 type definition RejectComponent
ASN.1 Type Definition
Type Name: RejectComponent
Comments: Reject Component is not specific to any particular operation. The invokeID may be
used to identify a specific operation.
Type Definition
SEQUENCE {
invokedID CHOICE {
invokeID InvokeIDType,
null NULL },
problem CHOICE {
generalProblem [0] IMPLICIT GeneralProblem,
invokeProblem [1] IMPLICIT InvokeProblem,
returnResultProblem [2] IMPLICIT ReturnResultProblem,
returnErrorProblem [3] IMPLICIT ReturnErrorProblem } }
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13 ETSI EN 300 138-6 V1.4.5 (1999-11)
The possibility to use TTCN and ASN.1 in combination is used, i.e. referring to an ASN.1 type from a TTCN type.
6.1.1.3 ASP type definitions
6.1.1.3.1 TTCN ASP type definitions
TTCN ASP type definitions only contain one PDU or no PDU at all. The relationship between an ASP type and a PDU
type is one-to-one. That is, there exists one ASP type definition for each PDU type definition (if that ASP type contains
a PDU).
All TTCN ASP type definitions are provided with a full identifier.
Some ASPs are not parameterized as shown in the example in table 5. Such ASPs are only used for requesting or
receiving service from the lower layer.
Table 5: TTCN ASP type definition DL_REL_IN
TTCN ASP Type Definition
ASP NAME : DL_REL_IN
(DL_RELEASE_INDICATION)
PCO Type : SAP
Comments :
Parameter Name | Parameter Type | Comments
Detailed Comments :
Table 6 shows an example of a parameterized ASP. All ASPs containing PDUs contain only that PDU and no other
parameters.
Table 6: TTCN ASP type definition DL_DATA_RQ_ALERT
TTCN ASP Type Definition
ASP NAME : DL_DATA_RQ_ALERT
(DL_DATA_REQUEST)
PCO Type : SAP
Comments :
Parameter Name | Parameter Type | Comments
mun (MessageUnit) |ALERT_PDU |
Detailed Comments :
6.1.1.3.2 ASN.1 ASP type definitions
There are no ASN.1 ASP type definitions in the ATS.
6.1.1.4 PDU type definitions
6.1.1.4.1 TTCN PDU type definitions
The TTCN PDU type reflects the actual data being transferred or received. All PDUs are embedded in ASPs.
If a specific PDU type definition contains elements defined in terms of a pre-defined type, that element has a restriction
attached to it.
6.1.1.4.2 ASN.1 PDU type definitions
There are no ASN.1 PDU type definitions in the ATS.
6.1.2 Test suite constants
No test suite constants are used or defined in this ATS.
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14 ETSI EN 300 138-6 V1.4.5 (1999-11)
6.1.3 Test suite parameters
Each test suite parameter is defined in terms of a predefined type or a referenced type. A referenced type is used when it
is necessary to attach restrictions to these type definitions (it is not allowed to include restrictions directly in the test
suite parameter table). The referenced type can have a length or value restriction attached to it in its declaration table.
6.1.4 Variables
6.1.4.1 Test suite variables
No test suite variables are used or defined in this ATS.
6.1.4.2 Test case variables
Each test case variable is defined in terms of a predefined type or a referenced type. A referenced type is used when it is
necessary to attach restrictions to these type definitions (it is not allowed to include restrictions directly in the test case
variable table). The referenced type can have a length or value restriction attached to it in its declaration table.
Where test case variables are used in constraints, they are passed as formal parameters.
6.1.5 Test suite operation definitions
The description part of a test suite operation definition uses either natural language or meta C.
Table 7: Test suite operation definition ASSIGN_CHI
Test Suite Operation Definition
Operation Name: ASSIGN_CHI(basic, primary: CHI; basic_flag: BOOLEAN)
Result Type : CHI
Comments : This operation is used to assign a correct Channel identification information
element to PDUs dependent on the type of access that is tested.
Description
{
if(basic_flag)
return basic;
else
return primary
}
Detailed comments:
The test suite operation definition shown in table 7 is used in the constraints part when assigning an element of type CHI
a value. As previously described, the CHI type can be defined in two ways depending on whether the ATS is testing
basic or primary rate access. This operation is used to assign a value to an element of CHI type. It takes three
parameters:
primary: a constraint of type CHI valid for primary rate access;
basic: a constraint of type CHI valid for basic access;
basic_flag: a boolean value: TRUE if basic access is applicable, FALSE otherwise.
This operation returns the correct constraint according to the Boolean flag basic_flag. That constraint will then be
assigned to the specific element of type CHI.
6.2 Constraints part
6.2.1 Structured type constraint declaration
For every structured type definition there exists one or more structured type constraint.
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15 ETSI EN 300 138-6 V1.4.5 (1999-11)
6.2.2 ASN.1 type constraint declaration
Constraints of this type are used to assign the corresponding type a specific value. These constraints are used for the
purpose of modelling unordered data or specific types that cannot be expressed in TTCN.
6.2.2.1 Specification of encoding rules
All ASN.1 constraints contained in this ATS are encoded according to ISDN, i.e. the ASN.1 data types are a
representation of structures contained within the ISDN specification (basic call, Generic functional protocol or
individual supplementary service). For example, if octets of an information element are specified in ASN.1 as a
SEQUENCE then this should be encoded in an Executable Test Suite (ExTS) as any other ISDN information element
specified using tabular TTCN. Encoding associated with the Basic Encoding Rules (BER), as specified in CCITT
Recommendation X.209 [11], should not be applied to any of the ASN.1 constraints specified in this ATS.
6.2.3 ASP type constraint declaration
6.2.3.1 ASN.1 ASP type constraint declaration
No ASN.1 ASP type constraint declarations exist in this ATS.
6.2.3.2 TTCN ASP type constraint declaration
For TTCN ASP constraint declarations there is a one-to-one relationship between its type and the constraint. That is,
there is only one constraint for each TTCN ASP Type Declaration. The reason for this is that the ASPs are used only for
carrying a specific PDU value. The many ASP constraints (and types) could have been avoided by using the meta type
PDU, but that was not suitable as values inside a specific PDU have to be referenced. To reference elements inside a
valueofmetatype PDU is not allowed according to ISO/IEC 9646-3 [7], so each ASP has to be defined as having a
parameter of a specific PDU type.
In all ASP constraints the embedded PDU constraint is either chained static or "semi-dynamic". That is, the PDU
constraint is always fixed to a specific ASP constraint but it (the PDU) may be parameterized.
All ASP constraints have a specific value for its parameter. No matching symbols are used in ASPs.
6.2.4 PDU type constraint declaration
6.2.4.1 ASN.1 PDU type constraint declaration
No ASN.1 PDU type constraint declaration exists in this ATS.
6.2.4.2 TTCN PDU type constraint declaration
PDU constraints are used for assigning values or patterns to the data being sent or received.
6.2.5 Chaining of constraints
6.2.5.1 Static chaining
Static chaining, that is a fixed reference to a specific constraint, is used in this ATS. The static chaining is used for static
binding of both variables and sub-structures.
6.2.5.2 Dynamic chaining
Dynamic chaining is achieved when having a reference to a value which is unknown. The only thing known (before
run-time) is the type of that reference. The reference is passed as a parameter. Strict dynamic chaining is not used in this
ATS. What is used is something that is called "semi-dynamic chaining". The definition of semi-dynamic chaining is that
the fixed reference is parameterized with an unknown value. That value is received as a parameter.
ETSI
16 ETSI EN 300 138-6 V1.4.5 (1999-11)
Table 8: TTCN ASP constraint declaration A_RST1
TTCN ASP Constraint Declaration
Constraint Name: A_RST1(FLAG: INTEGER)
ASN.1 Type : DL_DAT_IN_RESTARTr
Derivation Path:
Comments :
Parameter Name Parameter Value Comments
mun RST1(FLAG) RST1(FLAG)
Detailed comments:
Table 8 is an example of semi-dynamic chaining. The TTCN ASP constraint is parameterized with an INTEGER value
named FLAG. That value is passed further down in the structure as a parameter to a static named PDU constraint
reference.
6.2.6 Derived constraints
No derivation of any constraints is used. All constraints are considered to be base constraints.
6.2.7 Parameterized constraints
Parameterized constraints are used in this ATS.
6.2.8 Value assignment
6.2.8.1 Specific values
For specific value assignment both explicit values and references to explicit values are used.
6.2.8.2 Matching values
As matching values the following mechanisms are used:
Instead of Value:
AnyOrOmit "*"
AnyValue "?"
Omit "-"
Inside value:
AnyOne "?"
AnyOrNone "*"
6.3 Dynamic part
6.3.1 Test cases
Each test case contains the test purpose text from EN 300 138-5 [4]. To be able to read and understand the test case
dynamic behaviour it is recommended that the test steps are understood first.
ETSI
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