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1.SCOPE
2.DOCUMENT STATUS
2.1COPYRIGHT NOTICE
2.2ERRATA
2.3COMMENTS
3.REFERENCES
3.1NORMATIVE REFERENCES
4. DEFINITIONS AND ABBREVIATIONS
4.1DEFINITIONS
4.2ABBREVIATIONS
4.3REQUIREMENTS
5.GENERAL DESCRIPTION OF USSD
5.1INTRODUCTION
5.2THE USSD STANDARD
5.2.1 USSD phase
5.2.2 USSD phase
5.2.3 USSD phase+Enhanced USSD
5.3USSD CHARACTERISTICS AND PARAMETERS
5.3.1 General
5.3.2 The USSD Dialogue
5.3.3 Data Coding Scheme (DCS)
5.3.4 Service Code (SC)
5.3.5 USSD Timers
5.3.6 Multiple Dialogues
5.3.7 Addressing Aspects
5.3.8 Length of USSD String
6.WAP AND GSM USSD
6.1INTRODUCTION
6.2USSD DIALOGUE CONTROL PROTOCOL (UDCP)
6.3DATA CODING SCHEME (DCS)
6.4SERVICE CODE (SC)
6.5USSD OPERATION TIMERS
6.6MULTIPLE DIALOGUES
6.7ADDRESSING ASPECTS
6.8LENGTH OF THE USSD STRING
6.9THE USSD STRING
6.9.1 UDCP Information Element
6.9.2 Encoding of the USSD String
7.USSD DIALOGUE CONTROL PROTOCOL
7.1GOALS AND REQUIREMENTS
7.2ARCHITECTURAL OVERVIEW
7.3ADDRESSING
7.4UDCP SERVICE PRIMITIVES
7.4.1 Introduction
7.4.2 UDCP-Data
7.4.3 UDCP-Error
7.4.4 UDCP-Release
7.5DATA TRANSFER
7.5.1 Motivation
7.5.2 Procedure
7.6ERROR HANDLING
7.6.1 Motivation
7.6.2 Procedure
7.7USSD DIALOGUE RELEASE
7.7.1 Motivation
7.7.2 Procedure
7.8TIMERS AND COUNTERS
7.8.1 Idle Timer (IT)
7.8.2 Number Of RR (NumOfRR)
7.9PROTOCOL DATA UNITS
7.9.1 General
7.9.2 Data PDU
7.9.3 Data_Long PDU
7.9.4 Receive Ready (RR) PDU
7.9.5 Error PDU
7.9.6 Release Dialogue (RD) PDU
7.10HEADER FIELDS
7.10.1 More To Send flag (MTS)
7.10.2 Address Field
7.10.3 Version Flag
7.10.4 Error Code
7.10.5 Release Code
8.UDCP STATE TABLES
8.1EVENT PROCESSING
8.2ACTIONS
8.2.1 Timers
8.2.2 Counters
8.2.3 Messages
8.2.4 Output Buffer
8.2.5 USSD Dialogue
8.2.6 States
8.3MOBILE INITIATED USSD DIALOGUE
8.3.1 Mobile
8.3.2 Network
8.4NETWORK INITIATED USSD DIALOGUE
8.4.1 Mobile
8.4.2 Network
8.5EXAMPLE OF WDP AND UDCP
APPENDIX A.STATIC CONFORMANCE REQUIREMENT
A.1. FUNCTIONS
1. Scope
This document describes the mapping of WAP onto GSM Unstructured Supplementary Service Data (USSD) phase 2. The document includes a brief description of GSM USSD. For a complete description refer to [GSM0290], [GSM0390] and [GSM0490].
The GSM USSD service lack some fundamental services needed in order to use it as a bearer of the WAP protocols, and other applications with similar communication need. For example, the GSM USSD service is half-duplex and does not carry a destination address (only the MSISDN of the mobile phone). The USSD Dialogue Control Protocol (UDCP) has been defined in order to overcome these limitations. UDCP is specified in this document. The UDCP protocol is not part of the GSM Specifications from ETSI.
2. Document Status
This document is available online in the following formats:
• PDF format at http://www.wapforum.org/.
2.2 Errata
Known problems associated with this document are published at http://www.wapforum.org/.
2.3 Comments
Comments regarding this document can be submitted to the WAP Forum in the manner published at http://www.wapforum.org/.
3. References
3.1 Normative references
[GSM0290] ETSI European Digital Cellular Telecommunication Systems (phase 2) :
Unstructured Supplementary Service Data(USSD) – stage 1 (GSM 02.90)
[GSM0338] ETSI European Digital Cellular Telecommunication Systems (phase 2+) :
Alphabets and language-specific information (GSM 03.38)
[GSM0340] ETSI European Digital Cellular Telecommunication Systems (phase 2+) :
Technical realization of the Short Message Service (SMS) Point-to-Point (P)
(GSM 03.40 version 5.6.x)
4. Definitions and Abbreviations
4.1 Definitions
For the purpose of this specification the following definitions apply.
External Node
A node external to the GSM network. For example, a WAP Gateway.
Message
A general name for any PDU type.
Protocol Control Information (PCI)
Information exchanged between two protocol entities to coordinate their joint operation.
Protocol Data Unit (PDU)
A unit of data consisting of protocol control information and possibly user data.
Service Data Unit (SDU)
An amount of data handed down to the lower layer and whose identity is preserved from one end of a connection to the other.
4.2 Abbreviations
For the purposes of this specification the following abbreviations apply.
DCS Data Coding Scheme
ETSI European Telecommunication Standardization Institute
GSM Global System for Mobile Communication
IE Information Element
MSISDN Mobile Subscriber ISDN (Telephone number or address of device)
MS Mobile Station
MSB Most significant bits
NEI Network Element Identifier
PCI Protocol Control Information
PLMN Public Land Mobile Network
4.3 Requirements
This specification uses the following words for defining the significance of each particular requirement:
MUST
This word, or the terms « REQUIRED » or « SHALL », mean that the definition is an absolute requirement of the specification.
MUST NOT
This phrase, or the phrase « SHALL NOT », mean that the definition is an absolute prohibition of the specification.
SHOULD
This word, or the adjective « RECOMMENDED », mean that there may exist valid reasons in particular circumstances to ignore a particular item, but the full implications must be understood and carefully weighed before choosing a different course.
5. General description of USSD
5.1 Introduction
The GSM standard includes a wide range of supplementary services (Call Barring, Call Forwarding,etc). The services may be managed by entering text strings. For example, entering the text string “**21*1234567# SEND” will divert all incoming calls to the number 1234567. However, most MS manufacturers provide more user friendly methods to do this.
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