---
Author: János Kövesdi
Version: 155 17-CNL 113 580, Rev. A
Date: 2013-09-05

---
= BSSAPP (V7.3.0) Protocol Modules for TTCN-3 Toolset with TITAN, Function Specification
:author: János Kövesdi
:revnumber: 155 17-CNL 113 580, Rev. A
:revdate: 2013-09-05
:toc:

== How to Read This Document

This is the Function Specification for the set of BSSAPP protocol modules. BSSAPP protocol modules are developed for the TTCN-3 Toolset with TITAN.

== Scope

The purpose of this document is to specify the content of the BSSAPP protocol modules. Basic knowledge of TTCN-3 ‎<<_2, [2]>> and TITAN TTCN-3 Test Executor <<_3, ‎[3]>> is valuable when reading this document.

= General

Protocol modules implement the message structures of the related protocol in a formalized way, using the standard specification language TTCN-3. This allows defining of test data (templates) in the TTCN-3 language ‎<<_2, [2]>> and correctly encoding/decoding messages when executing test suites using the Titan TTCN-3 test environment ‎<<_3, [3]>>.

The protocol modules are using Titan’s RAW encoding attributes <<_4, ‎[4]>> and hence they are usable with the Titan test toolset only.

= Functional Specification

== Protocol version implemented

This set of protocol modules implements protocol messages and constants of the BSSAPP protocol. The modules are based on 29.018 V7.3.0 (see ‎<<_1, [1]>>).

=== Unimplemented Messages, Information Elements and Constants

None.

[[protocol-modifications-deviations]]
=== Protocol Modifications/Deviations

None.

[[encoding-decoding-and-other-related-functions]]
== Encoding/Decoding and Other Related Functions

This product also contains encoding/decoding functions, which assure correct RAW encoding of messages when sent from Titan and correct RAW decoding of messages when received by Titan. Implemented encoding/decoding functions:

[cols=3*,options=header]
|===

|Name
|Type of formal parameters
|Type of return value

|`enc_PDU_BSSAPp`
|PDU_BSSAPp
|octetstring

|`dec_PDU_BSSAPp`
|octetstring
|PDU_BSSAPp
|===

= Terminology

No specific terminology is used.

= Abbreviations

BSSAPP:: Base Station System Application Part+ (BSSAP+)

TTCN-3:: Testing and Test Control Notation version 3

= References

[[_1]]
[1] 3GPP TS 29.018 V7.3.0 (2006-12) +
3rd Generation Partnership Project; Technical Specification Group Core Network; General Packet Radio Service (GPRS) Serving GPRS Support Node (SGSN) - Visitors Location Register (VLR) Gs interface layer 3 specification (Release 7)

[[_2]]
[2] ETSI ES 201 873-1 v.3.2.1 (2007-02) +
The Testing and Test Control Notation version 3. Part 1: Core Language

[[_3]]
[3] User Guide for the TITAN TTCN-3 Test Executor

[[_4]]
[4] Programmer’s Technical Reference for the TITAN TTCN-3 Test Executor