DocumentIN

Intelligent Networks

Preface

• Intelligent Network (IN) is one concept to specify telecom services, and it has emerged from technical, business and protocol engineering point of view.

• Intelligent Networks are used by teleoperators for creation and management of value added services in telecom networks.

• Originally, IN has been applied in telephone and voice services, but today its meaning is also growing in the service integration of mobile and fixed telephone networks and as gateway to Internet based networks.

Contents

• Introduction and rationale 5• History of IN 11• IN Architecture 22• IN Architecture Evolution 24• IN Services 28• Introduction to Signaling System no. 7 38• IN Conceptual Model

50– Service Plane 53– Global Functional Plane 69– Distributed Functional Plane 83– Physical Plane 112

Contents

• Service Creation and Management124

• IN Markets 132• Future of Telecommunications :

– TMN135

– CAMEL136

– Broadband and Mobile IN 141– MBS

Intelligent Network (IN)

• Intelligent Network offers added value • Open standards, vendor independence• Rapid service creation and deployment• Customized services to users• Centralized service management• New opportunities to make business i.e. new

services, markets and customers• Rapid adaptation to market needs and competition source of Competitive Advantage

Value of Telecom Services

1990 20051995 2000

Digital

Mobile

Broadband

CONNECTIVITY SERVICES

VANS AND MOBILE SERVICES

DIGITAL MEDIA

Telecom Discontinuities

First Wave (1994-2000)

– Network operators and Service Providers

– Alliance building, fight for market share

– Mobile and Value Added growth (IN, data) – Internet becomes the Middleware

Second Wave (2000-2006)

– Broadband access technology solved – Service and Content Providers – Third generation mobile technology

Third Wave (2006 - )– New service and content control based architectures

Computer Controlled Services

TMN = Telecommunication Management NetworkIN = Intelligent Network

INLogical subscribers Logical services

Narrowband Broadband

Dynamic numbering / networks

Local Mobile Business

Differentiation

*** open techno logy ***

* ** custom er segm ents * * *

Separation of IN and Basic Services

NODE A NODE B NODE C

IN Service LogicIN Service Logic

Basic andsupplementaryservicesoffered to customers

Basic call processing

Hooks Hooks Hooks

Intelligent Network terminology

Functional Entity Definition Related productsCall Control Access Function (CCAF)

Provides the means for user to access the CCF; handles call setup, termination, hold-on etc... can also provide user w ith CLASS (Custom Local Area Signalling Services) properties

Service Sw itching Point (SSP), Netw ork Access Point (NAP)

Call Control Function (CCF) Provides the means for establishing and controlling bearer services on behalf netw ork users; the CCF refers to call and connection handling in classical sense

Service Sw itching Point (SSP)

Service Sw itching Function (SSF)

Provides the means to recognise calls requiring IN service processing, and to interact w ith call processing and service logic on behalf of these calls

Service Sw itching Point (SSP)

Service Control Function (SCF)

Provides the logical control applied to a call requiring IN service and handles service related processing activities, e.g. analysis translattion, screenig, routing; in other w ords the SCF contains the IN service logic

Service Control Point (SCP), adjuct (AD), Service Node (SN)

Service Data Function (SDF) Handles the access to service-related and netw ork data and provides a logical view of the data to the SCF

Service Control Point (SCP), adjuct (AD), Service Node (SN)

Specialised Resource Function (SRF)

Provides end-user interaction w ith the IN-structured netw ork through control over resources such as DTMF receivers, voice, recognation capabilities, protocol conversion, announcements etc.

Service Node (SN), Intelligent Peripheral (IP)

Service Management Function (SMF)

Provides service provisioning deployment and management control; the SMF allow s access to all IN functional entities for the transfer of information related to service logic and service data

Service Management System (SMS)

Service Creation Environment Function (SCEF)

provides the capability for the creation, verif ication and testing of new IN services

Service Creation Environment (SCE)

History of Intelligent Networks

SPCsElectro-mechanicalRelayswitches

Support forMgmt

Centralizeddatabases,CC and800 -services

FeatureNode

AINRel 0.1IN/2

CS1AINRel 0.2

AINRel 1

“Intelligence”

• SPC (Stored Program Control) exchanges in 1960s• Computer technology and telephone

network merged• Routing intelligence in switches• Offered services call waiting and traditional

PBX (AT&T)• Mid-1970s support for management and

maintenance through Operations Support System (OSS)

• Databases located at network control points• Value added services practical and

economical to offer• Centralized databases in 1980s (AT&T)

• First calling card and 800-services• AT&T Software Defined Network (“pre-

VPN”)• Term ‘Intelligent Network’, Bellcore 1984

• ‘Feature Node’ concept 1985 (Ameritech)

– total separation of services and switching– vendor independence – new services quickly and economically– services offered by third party

• IN/1, Bellcore 1986• Centralized architecture

– SCP only a simple “number translator”– in service provision both SSP and SCP had to

be updated

– SS#7 as common channel • IN/2, Bellcore 1987

• Expanded IN/1 functionality– no switch dependency– rapid deployment of new services– IP concept was introduced– project timescales discovered unrealistic

• IN/1+, Bellcore 1988• Interim, downsized solution to IN/2• Timescales unrealistic, too

• Both IN/2 and IN/1+ were rejected• AIN (Advanced IN), Bleacher 1989

• Influenced by IN/2• In co-operation with other organizations

– solid industry standard– better interoperability with different systems– foundation for ideal IN-systems

• Service-, switch- and equipment- independent IN-systems

• Stepwise development via number of releases

– AIN Rel. 0.1, IN/1-based implementations– AIN Rel. 0.2, additional specifications for Rel. 0.1– AIN Rel. 1, target AIN-architectures

• AIN Rel. 1 is due out 1995-8CS (Capability Sets), ITU-T, ETSI 1989 -

• European equivalent to AIN• Define basic IN-services (e.g. freephone,

premium rate and UPT)

• Service independent building blocks, SIBs – basic IN-service functional entities (e.g. digit collect and

analyze, time and date functions)– ideal service creation by grouping SIBs

• Development in phases– CS1, published 1993– CS2, published 1999– CS3, design started 1997– CS2 specifies management

interfaces and call-unrelated switching functions

– CS3 focus on mobility management (e.g. GSM 2+ and 3 integration) and Interoperability of IN and other networks (e.g. CAMEL)

Intelligent Network Standards

IN Concept and Modeling

Definition of next CS

Recommendation for CSx

Capability sets

T1 T2 Tx

Structure of IN Standards

Q.12XY with X and Y as follows:X Y00 - General10 - CS1 1 - Principles, Introduction20 - CS2 2 - Service Plane (not included for CS1)30 - CS3 3 - Global Functional Plane40 - CS4 4 - Distributed Functional Plane50 - CS5 5 - Physical Plane60 - CS6 6 - For future use70 - CS7 7 - For future use80 - CS8 8 - Interface Recommendations90 - Vocabulary 9 - Intelligent Network Users Guide

Intelligent Network Standards

Recommendation Q.1200 Q-Series Intelligent Network Recommendations StructureRecommendation Q.1201 Principles of Intelligent Network ArchitectureRecommendation Q.1202 Intelligent Network - Service Plane ArchitectureRecommendation Q.1203 Intelligent Network - Global Functional Plane ArchitectureRecommendation Q.1204 Intelligent Network - Distributed Functional Plane

ArchitectureRecommendation Q.1205 Intelligent Network - Physical Plane ArchitectureRecommendation Q.1208 Intelligent Network - Application Protocol General AspectsRecommendation Q.1211 Intelligent Network - Introduction to Intelligent Network

Capability Set 1Recommendation Q.1213 Intelligent Network - Global Functional Plane for CS1Recommendation Q.1214 Intelligent Network - Distributed Functional Plane for CS1Recommendation Q.1215 Intelligent Network - Physical Plane for CS1Recommendation Q.1218 Intelligent Network - Intelligent Network Interface

SpecificationsRecommendations Q.1219 Intelligent Network Users guide for Capability Set 1

IN Architecture

• The key question is: How Intelligence is provided and distributed in the network

• IN Conceptual Model (INCM) gives a framework which will be presented here

• Other models may emerge, most probably from voice, multimedia and mobile value added services in Intranet and Extranet

• Future broadband intelligence standards will be chosen by the market

IN Architecture

SSP SSCP

SSF SSF

CCF CCF

SS#7 network

SCPSCF

SDPSDF

AD SDF

SCESCEF

Signaling

Management

SignalingTransferPoint (STP)

Transport

Optional FE

SMPSMF

IN architecture evolution

•Separation of switching and intelligence in the pre-IN, switch-based networks

Control logic (intelligence) Local switch Transit switch

Calling subscribers

Called subscriber

•Centralized intelligence in the network, phase one in IN-evolution

Service Control Point, SCP Local switch Service Switching Point, SSP

Calling subscribers

Called subscriber

•Flexible intelligence allocation in the network, phase two in IN-evolution

Service Control Point, SCPLocal switch Service Switching Point, SSP

Service X in local service point

Service Y in centralized service point

Service Z in user terminal ie. phone

Control logic (intelligence)

Mobile services(GSM, PCS)

Mobile ServicesSwitching Center

Home Location Register

Base Station System

•Intelligence on demand

Service Control Point, SCP Local switch Broadband Service Switching Point,BSSP (ATM-switch)

Some of the service intelligenceresides in the user terminal

Intelligence required for a serviceis downloaded to the nearest control point

Broadband IP, Media Server

Control logic (intelligence)

Future mobile services(UMTS, FPLMS, MBS)

Media stream

Control stream

IN Services

• Services are the core of IN• Rapid service creation and deployment• Time to market the competitive advantage• Different services for different needs

• Ideally services facilitate• the profiling of existing services as well as

the provision of custom services requirements

• third party service provision• service creation by the end users

IN Services

Service Creation ideally SIB-based• Easy to use• Fast to implement and test• Flexible provision in different networks

through standard interfaces (TCAP/INAP)• Reuse of SIB-components• However, present SCEs are not all SIB-

IN Services

• Service categories• Mass market services

– well-defined set of ‘basic’ service features– no customer differentiation– e.g. 800, premium rate, VPN, mobile services

• Profiled services– same features as in mass market services– user data can be easily and rapidly modified by

the service subscriber or the users– e.g. 800 service with dynamic routing, UPT,

chaining of fixed and mobile services

IN Services

• Custom services– tailored services for specific user needs– service creation and management by users– e.g. personal assistants, VPN and mobility in

Intranet, voice and media integration

Mass market services

Profiled services

Custom services

1980 1990 2000

ServiceComplexity /Value to customers

IN Services

• Mass market services

• 800-service i.e. freephone– the oldest and most widely used IN-service– business to consumer or business to business– the service subscriber is charged, not users– based on pure number translation with or without

intelligent routing e.g.• call distribution• call queuing• time and date dependencies

IN Services

• Premium rate– 700-service (also 600-service in Finland)– user is charged for the network and services– typically provision of information, direct selling,

chat lines and televoting

• Virtual Private Network, VPN– defined as a logical closed user group,

implemented over public switched telecommunications facilities

– provision of private numbering plan– call charging on the basis of duration of usage

IN Services

– usage for switched voice, switched data or both– single interface for all domestic and international

needs e.g.Sonera’s 02040 xxxx -countrywide numbering plan

• Mobile/cellular services– IN with capability of dynamic location tracking of

the mobile subscriber– the fullest mobile-IN realization with GSM – Universal Personal Telephony (UPT)

• communication between people, not devices• “just-in-time communications”

IN Services

• Profiled services• Dynamic 800 call routing

– control of the service data in call routing via switching environment

– subscriber can have own SMS to gather information of the service usage

• Bank account query– DTMF coded user ID and password

• Personal Communications Service (PCS)– users have unique PINs (Personal identification Number)

– network access terminal independence

IN Services

• Custom services• Pure customized IN-services not yet exist• Possible scenario towards sophisticated

interactive voice and multimedia services• Requires complete IN-system management,

which encompasses– service management– network element management– customer management

IN services in Europe

1995 1996 1997 1998 1999 2000

Mrd ECU

Others

Calling Card

Televoting

Premium Rate

Feephone

IN Services

Signaling System no.7

Secure Fault-Tolerant

Speech and DataTransmission Network

Signaling System no.7 NetworkSTP (Signaling Transfer Point)

XUNI(User Network Interface)

NNI( Network Node Interface)

SP(Signaling Point)

Physical

Data link

Network

Transport

Session

Presentation

Application

MTP Level 1

MTP Level 2

MTP Level 3

User PartsTUPISUPMUP

OSI-RM SS7

OSI Reference model and Signaling System no. 7

NetworkLayers

NetworkPart

ApplicationLayers

User / ApplicationParts

• ITU-T Recommendations Q-series• Common channel outband signaling

system (CCSS7, CCS7, SS7, SS#7)• signaling separated from payload (voice,

data) to its own network• Outband signaling enables separation of

switching and control intelligence in telecommunications network

• Major benefits include• improves the speed and flexibility of call

setup• allows processors to exchange information

rapidly for a call requiring special routing or handling

• enables operation companies to access customer information stored in network databases to deliver advanced telecommunications services networkwide

• provides the originating switch or customer with detailed progress and processing information about the call as it is established

• SS7 is an OSI-RM compliant protocol• network part is responsible for network

related functions (connection setups, routing, transport, error detection)

• user/application part includes the service specific functions

• Components of SS7 network• Signaling Link, SL (MTP1-MTP2)• Signaling Transfer Point, STP (MTP1-MTP3)• Signaling Point, SP (MTP1-SCCP, includes

one or more user/application parts)

SS7 SS7

Signalling Link (SL)

SSP Signalling Point (SP)

SCP SSCP

• MESSAGE TRANSFER PART (MTP)• Provides reliable connectionless service

for routing messages through SS7 network• MTP1 (signaling data link)

– physical layer of OSI model– physical and electrical characteristics

• MTP2 (signaling link)– provides reliable sequenced delivery of data

across signaling data link– layer 2 of OSI model

• MTP3 (signaling network)– provides functions for routing data across

multiple STPs between signaling points– message handling

• routing (determines the signaling link to be used)• distribution (determines the user part to which

message should be delivered)

– network management• objective is to overcome link failures or link congestion

• three categories:• 1) signaling traffic management• 2) signaling link management• 3) signaling route management

• SCCP (Signaling Connection and Control Part)

– equivalent to OSI network layer– addressing capability with PC (Point Code) and

SSN (Sub System Number)• Destination Point Code• Originating Point Code

– message delivery management

• TCAP (Transaction Capabilities Application Part)

– distributed SS7 processes’ dialogue management (comparable to OSI ROSE)

– interfaces directly with SCCP-layer– component sub-layer

• manages service remote procedure call parameter coding and decoding

– transaction sub-layer• manages TC-users’ communication (queries and

responses)

• INAP (Intelligent Network Application Part)– set of different functional service elements

• OPERATION-elements• ERROR-elements• RESULT-elements

– OSI ROSE user-protocol (TC-user)– INAP-services are defined with ASN.1 (Abstract

Syntax Notation One)- language– INAP ASN.1 descriptions are compiled to coding/

decoding entities– CS-services are defined with INAP-interfaces

SAO = Single Association ObjectSACF = Single Association Control FunctionMACF = Multiple Association Control FunctionASE = Association Service Element

a) Single Interaction

Application process

b) Multiple Coordinated Interaction

Application process

INAP Architecture

IN Conceptual Model

• The IN Conceptual Model (INCM) was designed to serve as a modeling tool for the Intelligent Network. It is defined in the CCITT Recommendation Q.1201.

• INCM is divided into four planes:– Service plane– Global functional plane– Distributed functional plane– Physical plane

IN Conceptual Model objectives

• INCM forms the basis for the standardization work and it forms design guidelines for the IN architecture to meet the following main objectives: – service implementation independence – network implementation independence – vendor and technology independence

• INCM is the first complete approach to modular telecom service development

IN Conceptual Model Planes

serviceplane

globalfunctional

distributedfunctional

physicalplane -

protocolsand

processing

global service logic

service1 service2

FE1FE2

Service Plane

• The Service Plane represents an exclusively service-oriented view. This view contains no information whatsoever regarding the implementation of the services in the network. What is perceived is the network's service-related behavior as seen, for example, by a service user. Services are composed of one or more Service Features (SFs), which represent the "lowest level" of services.

IN CS.1 Services

Automatic Alternative Billing (AAB)

Abbreviated Dialing (ABD)

Account Card Calling (ACC)Credit Card Calling (CCC)

Call Distribution (CD)Call Forwarding (CF)

– Comp. of Call to Busy Subscriber

– Conference Calling (CON)Call Rerouting Distribution (CRD)Destination Call Routing (DCR)Follow-Me-Diversion (FMD)

Freephone (FPH)

Mass Calling (MAS)Malicious Call Identification (MCI)Premium Rate (PRM)Security Screening (SEC)Selective Call Forward on Busy/Don’t

Answer (SCF)Split Charging (SPL)Televoting (VOT)Terminating Call Screening (TCS)User-Defined Routing (UDR)Universal Access Number (UAN)Universal Personal Telecommunications

(UPT)Virtual Private Network (VPN)

IN CS.1 Service Features

Abbreviated Dialing (ABD) Customized Recorded Announcement (CRA)

Attendant (ATT) Customized ringing (CRG)Authentication (AUTC) Destinating User Prompter (DUP)Authorization Code (AUTZ) Follow-Me Diversion (FMD)Automatic Call Back (ACB) Mass Calling (MAS)Call Distribution (CD) Meet-Me Conference (MMC)Call Forwarding (CF) Multiway Calling (MWC)Call Forwarding on Busy (CFC) Off-Net Access (OFA)Call Gapping (GAP) Off-Net Calling (ONC)Call Hold with Announcement (CHA) One Number (ONE)Call Limiter (LIM) Origin Dependent Routing (ODR)Call Logging (LOG) Originating Call screening (OCS)Call Queuing (QUE) Originating User Prompter (OUP)Call Transfer (TRA) Personal Numbering (PN)Call Waiting (CW) Private Numbering Plan (PNP)Closed User Group (CUG) Reverse Charging (REVC)Consultation Calling (COC) Split Charging (SPLC)Customer Profile Management (CPM)

Example: Freephone

• FPH allows reverse charging, the subscriber accepting to receive calls at its expenses and being charged for the whole cost of the call

• FPH allows the served user having one or several installations to be reached from all part of the country, or internationally as appropriate, with a freephone number and to be charged for this kind of call

Example: Freephone Service

SSP IP/SN SCP SDP

SWITCH

Routing

Routing Detect

Connect

Service Logic

Data Function

Service Logic

Charging

Service Logic 9

1. Dialling service number 0800 123 456

2. IN-Call Detection from B-number

3. Service Logic function. Database

query (from SDP)

4. SDP returns programmed charging

information and C-number.

5. SCP sends INAP message to switch

(including charging information)

6. Switch saves special charging

information

(including new number)

8. Switch connects call to new number

9. Alarming

Example: Premium Rate

• PRM service allows to pay back a part of the call cost to the called party, considered as an added value service provider.

• PRM allows the served user having one or several installations to be reached from all or part of the country, or internationally as appropriate, with a premium rate number. The calling party will be charged with a premium rate for this kind of call.

• It is a service that can be available in the public telephone network whereby, a service provider having connections to the public network can be allocated a special telephone number by a network operator, known as a Premium Rate number.

Example: PRM (cont.)

• The provider is able to earn revenue for each call successfully made to his premium rate number. In return he provides callers with some form of information service via the call connection. Calls to the premium rate number are charged to the caller at special rates to cover the price of the call and the price of the information service. The network operator administration collects the revenue for each call and shares it with the provider.

• The geographical location of the provider is unrelated to his premium rate number i.e., he can be located anywhere in the network. The provider may specify the catchment area from which he wishes to receive calls. In the case of multi-site providers, the site to which the caller is connected can depend on the catchment area in which the call originated.

Example: Premium Rate Service

SSP IP/SN SCP SDP

SWITCH

Routing

Routing Detect

Connect

Service Logic

Data Function

Service Logic

Charging

Service Logic

Connect IP

Announcment

Service Logic

1. Dialling service number 0700 123 456

3. Service Logic function. Database

query (from SDP)

4. SDP returns programmed charging

information and C-number.

(for playing announcment)

6. Switch connects IP-device to sub-

scriber line.

7. IP device plays announcment

9. Switch saves special charging

information

(including new number)

11. Switch connects call to new number

Example: Virtual Private Network

• VPN permits to build a private network by using the public network resources. The subscriber’s lines, connected on different network switches, constitute a virtual PABX, including a number of PABX capabilities, such as Private Numbering Plan, call transfer, call hold, and so on.As an option, to each private user, either a class of service or specific rights and privileges may be attributed. As another option, a private user may access his private network from any point in the network keeping, after authentication, his class of service or his specific rights and privileges.

Example: VPN (cont.)

• VPN the use of public network resources to provide private network capabilities without necessarily using dedicated network resources. The subscriber’s lines, connected to different network switches, constitutes a virtual private network that may include private network capabilities, such as dialing restrictions, Private Numbering Plan (PNP), hold, call transfer, and so on.A PNP may provide a group of users the capability to place call by using digit sequences having different structures and meaning than provided by the public numbering plan, or PNP may utilize the public numbering plan’s digit sequences, structures and meaning.

Example: VPN (cont.)

• VPN allows a subscriber to define and use a PNNP for communication across one or more networks between nominated user access interfaces. A PNP provides a group of users the capability to place calls by using digit sequences having different structures and meanings than provided by the public numbering plan.

Example: VPN Service(with PNP service features)

SSP IP/SN SCP SDP

SWITCH

Routing

Routing Detect

Connect

Service Logic

Data Function

Service Logic

Charging

Service Logic

1. Dialling short number (fromVPN to VPN) or

company number with subnumber (to VPN)

3. SCP sends message to SDP (db query)

4. SDP returns “Calling Plan etc.”

6. Switch saves charging information

7. SCP sends message to switch

(Connet line to VPN number)

8. Switch connects line

Example: Credit Card Calling

• The CCC service allows subscribers to place calls from any normal access interface to any destination number and have the cost of those calls charged to the account specified by the CCC number.

• The service allows the caller to be automatically charged on a bank card account, for any type of outgoing call. The caller has to dial his card number and a PIN (Personal Identification Number), then the called number. As an option forward calls may be allowed, without dialing again card number and PIN

Example: Universal Personal Telephony

• UPT is a mobility service which enables subscribers to make use of telecommunications services on the basis of a unique Personal Telecommunications Number (PTN) across multiple networks at any network access. The PTN will be translated to an appropriate destination number for routing based on the capabilities subscribed to by each Service Subscriber (SS).

• UPT provides personal mobility by enabling a user to initiate any type of service and receive any type of call on the basis of a unique and personal

Example: UPT (cont.)

• network-independent number, across multiple networks, at any user-network access (fixed, movable or mobile), irrespective of geographic location, limited only by terminal and network capabilities.

Example: Service mappings

Service Feature FPH CCC VPN UPTABD o o C = CoreATT o O = OptionalAUTZ C o C (not all O’s here)AUT oCD oLOG o o o oQUE o oTRA oCUG oCOC oCPM o o oCRA o o oCRG o oDUP o oFMD o CONE COUP o C o oPN CPNP CREVC CSPLC CTDR o o o

Global Functional Plane

• The Global Functional Plane (GFP) models the IN-structured network as a single entity. Contained in this view is a global (network-wide) Basic Call Processing (BCP) SIB, the Service Independent Building blocks (SIBs), and Point of Initiation (POI) and Point of Return (POR) between the BCP and a chain of SIBs. The Global Service Logic (GSL) describes how service features are built using SIBs.

Global Functional Plane

Global Functional Plane Model:

GSLPOI

Service Independent Building Blocks

• SIBs are independent from any physical architecture considerations

• Each SIB has an interface with one or more inputs and one or more outputs

• SIBs are reusable modular building blocks, describing a single complete activity, and used by the service designer to create services

SIB chains in a Service

SIB1SIB1 SIB2SIB2 SIB3SIB3 SIB6SIB6

SIB4SIB4 SIB5SIB5

POI Basic Call Process POR POR

Service Independent Building Blocks

Algorithm ScreenCharge Service Data

ManagementCompare Status NotificationDistribution TranslateLimit User InteractionLog Call Verify

Information Queue

SIB graphical representation

SSD SSDparameters

Logicstart

Logicend

CID inputparameters

CID outputparameters

SIB inputs and outputs

• Logical start (input)• Service Support Data, SSD (input)

– Fixed Parameters (depend on the SIB type)– CID Field Pointers (CIDFP)

• Call Instance Data, CID (input) • Call Instance Data, CID (output)

– Dynamic parameters (depend on call instance) Logical end (output)

Example: The Queue SIB

Example: Automatic Alternative Billing

• The AAB service enables a user to make a call from any telephone and for the call charge to be billed to the user's account which is specific to this service, and which does not refer either to the calling line or to the called line. An account code and PIN are allocated to the service user by service management procedure.

• To invoke the service, the user dials an access code as a free call. Different access codes could be used to identify the language to be used. The user then receives announcements asking for him to dial his account code and PIN. The account code and PIN are validated, and a check could be made for expired credit limits.

• NOTE: Account/credit card calling is similar, with the account No. being supplied using a card wipe.

Example: AAB (Cont.)

• The AAB service allows a user to call another user and ask him to receive the call at his expenses. Two steps may be defined: the calling party is welcomed to record a brief message giving the caller's name and explaining the call reason, then the called party is alerted, receives the recorded message and is asked to accept to be charged for that call.

IN Automatic Alternative Billing

POI PORPORBasic Call ProcessAddressAnalysed

Clear Call Proceedwith New Data

NO MATCHScreenVerifyUserInteraction

Translate Charge

UserInteraction

PORPOI

Example: AAB

1 Basic Call Processinput POI Call Arrival

CID 1) dialed number 2) calling line id

2 User Interaction SIBinput SSD 1) announcement parameters 2) collected info

CID calling line idoutput CID collected info.

End Ok

3 Verify SIBinput SSD 1) min. and max. of numbers 2) format

CID collected infooutput End Ok

Example: AAB

4 Screen SIBinput SSD screenlist indicator

CID collected infooutput End 1) Match or 2) No Match

IF "No Match":

5 User Interaction SIBinput SSD announcement parameters

CID calling line idoutput End Ok

6 Basic Call Processinput POR Clear Calloutput CID calling line id

Example: AAB

IF "Match":

7 Translate SIBinput SSD 1) Type 2) Filename

CID dialed numberoutput CID called number

End Ok

8 Charge SIBinput SSD Account CodeList.

CID Account Codeoutput End Ok

9 Basic Call Processoutput POR Proceed with New Data

CID called number

Distributed Functional Plane

• The Distributed Functional Plane (DFP) models a distributed view of an IN-structured network by defining Functional Entities (FEs). Each Functional Entity may perform a variety of Functional Entity Actions (FEAs). SIBs can be then described by a collection of FEAs in different functional entities and information flows between FEAs. A given FEA may not be distributed across functional entities.

Functional Entities (FEs)

CCAF CCF CCF CCF CCAF

Service managementService controlCall and Resource controlBearer control (below)

Functional Entities

• CCAF (Call Control Agent Function)• CCF (Call Control Function)• SSF (Service Switching Function)• SCF (Service Control Function)• SDF (Service Data Function)• SRF (Service Resource Function)• SMF (Service Management Function)• SMAF (Service Management Access Function)• SCEF (Service Creation Environment Function)

Functional entities

• Call Control Agent Function• the interface between user and network call

control functions. It has the following characteristics:

– provides for user access, interacting with the user to establish, maintain, modify and release, as required, a call or instance of service;

– accesses the service-providing capabilities of the Call Control Function, using service;

Functional Entities

– requests (e.g. setup, transfer, hold, etc.) for the establishment, manipulation and release of a call or instance of service;

– receives indications relating to the call or service from the CCF and relays them to the user as required;

– maintains call/service state information as perceived by this functional entity;

Functional Entities

• Call Control Function• The CCF is the Call Control Function in the

network that provides call/connection processing and control.

– establishes, manipulates and releases call/ connection instances as “requested” by the CCAF;

– provides the capability to associate and relate CCAF functional entities that are involved in a particular call and/or connection instance (that may be on SSF requests);

Functional Entities

– manages the relationship between CCAF functional entities involved in a call (e.g. supervises the overall perspective of the call and/or connection instance);

– provides trigger mechanism to access IN functionality (e.g. passes events to the SSF);

– managed, updated and/or otherwise administered for its IN-related functions (i.e. trigger mechanisms) by the Service Management Function SMF;

Functional Entities

• Service Switching Function• the Service Switching Function, which,

associated with the CCF, provides the set of functions required for interaction between the CCF and Service Control Function

– extends the logic of the CCF to include recognition of service control triggers and to interact with the SCF;

Functional Entities

– manages signaling between the CCF and the SCF;

– modifies call/connection processing functions (in the CCF) as required to process requests for IN provided service usage under the control of the SCF;

– is managed, updated and/or otherwise administered by an SMF;

Service Switching Function Model

IN local resource data

Bearer control

Basic call resource datamanager

Basic call resource dataCCAF

IN local resource datamanager

SCF access manager

IN Switching Manager

Feature interactionmanager/call manager

Basic call manager

Non-IN feature manager

IN switching statemodel instance

SCF SLPI A

Originating Basic Call State Model

1. O_Null & Authorize Origination attempt

2. Collect Info

3. Analyze Info

4. Routing & Alerting

5. O_Active

106. Exception

Orig. Attempt_Authorized

Collected_Info

O_Abandon

Analyzed_Info

O_Disconnect

O_Mid_Call

Route_Select_Failure

O_Called_Party_Busy

O_No_Answer

Key: Transition

Detection Point (DP)

Point in Call (PIC)

Functional Entities

Service Control Function• The SCF commands call control functions in

the processing of IN provided and/or custom service requests. The SCF may interact with other functional entities to access additional service logic or obtain information (service or user data) required to process a call or service logic instance

– interfaces and interacts with SSF/CCF, SRF and SDF functional entities;

Functional Entities

– contains the logic and processing capability required to handle IN provided service attempts;

– interfaces and interacts with other SCFs, if necessary;

Service Control Function Model

SLP library

Service logic execution environment (SLEE)SLP Manager

Service logicexecution manager

Functional entity access manager

Functional routinelibrary, includes

functional routines

Service data objectdirectory

IN network-wideresource data

Functionalroutine

manager

SCF dataaccess

manager

Servicelogic

selection /interactionmanager

Resourcemanager

SLP programinstances

SSFSMF SRF SDF

Functional Entities

• Service Data Function• The SDF contains customer and network

data for real time access by the SCF in the execution of IN provided services.

– interfaces and interacts with SCF as required;– interfaces and interacts with other SDFs, if

necessary;– is managed, updated and/or otherwise

administered by an SMF;

Service Data Function Model

SDFdata

manager

Dynamic data

SMF SCFSDF

Service data object directory

Static data with large volume

Exclusive controlmanager

Functional Entities

• Service Resource Function• The SRF provides the specialized resources

required for the execution of IN provided services (e.g. digit receivers, announcements, conference bridges, etc.)

– interfaces and interacts with SCF and SSF (and with the CCF);

Functional Entities

– may contain the logic and processing capability to receive/send and convert information received from users;

– may contain functionality similar to the CCF to manage bearer connections to the specialized resources;

Service Resource Function Model

SRF resourcemanager

Resources

SSF/CCF UserSCFSMF

Functional Entities

• Service Management Function• This function allows deployment, provision

and support of IN provided services. Particularly, for a given service, it allows the coordination of different SCF and SDF instances

– billing and statistic information are received from the Scoffs;

– modifications in service data are distributed in SDKs;

Functional Entities

• Service Management Access Function– This function provides an interface between

service managers and the SMF. • Service Creation Environment Function

– This function allows services to be defined, developed and tested. Output of this function would include service logic, service management logic, service data template and service trigger information.

Relating GFP to DFP

SIB SSF/SCF SCF SRF SDFAlgorithm *Charge * *Compare *Distribution *Limit * *Log Call Information * * *Queue * * *Screen * *Service Data Management * *Status notification * * *Translate * *User Interaction * * *Verify *Basic Call Process * *

Example: The Queue SIB

QueueQueue

Max ActiveMax NumberMax TimeAnnouncement ParameterCIDFP - ResourceCIDFP - Error

Call ReferenceResource

Resource Available

Call Party Abandon

Q Timer Expiry

Q Full

Time spent on QueueError Cause

SIB as a combination of Fees

• Sibs are described using FEAs and information flows between them

• FEAs are numbered with XYYZ where

• X presents the FE – CCF/SSF = 2, SRF = 3, SDF = 4, SCF = 9

• YY presents the SIB– BCP = 0, Algorithm = 1, ... , Verify = 13

• Z distinguishes the FEAs with common XYY

Example: Queue with announcement

Information flows between FEAs are INAP operations:Request Report BCSM req.ind (REQREPBCSM)Connect to Resource req.ind (CONNTORES)Play Announcement req.ind (PLAYANN) Disconnect Forward Connection req.ind (DISCFWDCONN)

SRF SCF CCF/SSF

Serv. Logic

PLAYANN

REQREPBCSM

CONNTORES

DISCFWDCONN

resource free

INAP operation description

xyz OPERATIONARGUMENT {Parameter1, Parameter2,...}RESULT {Parameter1, Parameter2,...}LINKED {operation3, operation4,...}ERRORS {error1, error2,...}

error1 ERRORPARAMETER {Parameter6, Parameter7,...} etc

To Peer

OperationsResultsErrors

INAP User ASEs

To Peer

To PeerINVOKERETURN RESULTRETURN ERRORREJECT

BEGINCONTINUEENDABORTUNIDIRECTIONAL

COMPONENT SUBLAYER

TRANSACTION SUBLAYER

Connectionless SCCP

ROSE PDUs

TCAP ASE

Example INAP operation

ConnectToResource ::= OPERATIONARGUMENT

ConnectToResourceArgERRORS {

MissingParameterSystemFailureTaskRefusedUnexpectedComponentSequenceUnexpectedDataValueUnexpectedParameter}

• Connects a call from SSP to IP with SRF

ASN.1 example: ConnectToResourceArg

ConnectToResourceArg ::= SEQUENCE { CHOICE { ipRoutingAddress [0] IPRoutingAddres legId [1] LegId both [2] SEQUENCE {

ipRoutingAddress [0] IPRoutingAddres legId [1] LegId

},none [3] NULL },extensions [4] SEQUENCE SIZE (0..MAX) OF

ExtensionField OPTIONAL},

ETSI Core INAP

• ETS 300 374-1 (Sept 1994) defines the INAP for support of CS-1

• Supports interactions between SSF, SCF and SRF

• Interactions with SDF missing in Part 1• Contains simplifications to in ITU-T

Q.1214 (several operations replaced by InitialDP and EventReportBCSM)

Physical Plane

• The Physical Plane models the physical aspects of IN-structured networks. The model identifies the different Physical Entities (PEs) and protocols that may exist in real IN-structured networks. It also indicates which functional entities are implemented in which physical entities.

Physical Plane

SSP SSCP

SSF SSF

CCF CCF

SS#7 network

SCPSCF

SDPSDF

AD SDF

SCESCEF

Signaling

Management

SignalingTransferPoint (STP)

Transport

Optional FE

SMPSMF

Physical Entities (PEs)

• Network Access point (NAP)• Service Switching Point (SSP)• Service Control Point (SCP)• Service Data Point (SDP)• Adjunct (AD) • Intelligent Peripheral (IP)• Service Node (SN)• Service Management System (SMS)• Service Creation Environment (SCE)

Physical Entities

• Network Access Point, NAP• is a Physical Entity that includes only the

CCAF and CCF functional entities and it has the ability to determine when IN processing is required. It must send calls requiring IN processing to an SSP.

Physical Entities

• Service Switching Point, SSP• PSTN exchange modified to recognize IN-

services• Can have dialogues with different SCPs

– trigger point defines required service in calls– interconnections via Signaling Transfer Points

• Dialogues with SCPs based on SS7 signaling - no actual payload is transmitted

• SSP+”SCF”+”SDF” = SSCP, Service Switching and Control Point

Physical Entities

• Service Control Point, SCP• Service logic is controlled by Service Logic

Processing Program (SLP)• Services are run in Service Logic Execution

Environment e.g. OS, runtime modules, management procedures etc.

• Service data can be located in Service Data Point ie. (relational) database

– usually integrated to SCP– can be a commercial product (Oracle,Sybase)

Physical Entities

• Service interfaces to SSP abstracted with TCAP and INAP (OSI application layer)

• Fault tolerance with doubled and/or mated pair systems

• Adjunct, AD• Functionally equivalent to SCP, but has

– direct communications link to SSP– supports one-to-one relationship with SSP– usually small geographical coverage

Physical Entities

• Intelligent Peripheral, IP or Service Resource Point, SRP (from CS.2 onwards to separate from Internet Protocol, IP)

• Connected to SSP over a high speed bus• Manages resources such as

– announcements– speech recognition– digit collection– protocol conversions

• Controlled by SSP or SCP (or SN)– interface to SSP incl. both signaling and data,

Physical Entities

but to SCP (or SN) only signaling

• Service Node, SN• Complete set of resources and services for

advanced IN services– can have the functionality of both SCP and IP– point-to-point connection to SSPs (via STPs)

• Service Management System, SMS• Supports both commercial and technical IN

service management– service users can e.g. change PIN (Personal

Identification Number) in UPT-service

Physical Entities

– service subscriber to an 800-service can configure call routing

– operator can load new services to the SCP– operator can gather statistics and billing data to

the OSS (Operations Support System)

• Handles service management in the distributed IN systems

– data consistency in SCPs’ databases (SDPs)

• Usually closely coupled with the SCP

– no standard SMS-SCP interface protocols exist

Physical Entities

• Service Creation Environment, SCE• Framework for defining, developing and

testing SLPs e.g.– graphical SIB-based ‘drag and drop’– graphical SDL-based– high level, 4GL language based– low level C-language based with special

resources e.g. libraries and runtimes– proprietary graphic and/or text based

• Services are loaded via SMS to SCPs

Relating DFP to Physical Plane

PE:s SCF SSF/CCF SDF SRFSCP C * C *SN C C C CAD C * C *SSP O C O OIP / SRP * * * CSDP * * C *SSCP C C C ONAP * C (CCF only) * *

C: CoreO: Optional*: Not allowed

IN Service Creation

Service Description

Service Analysis

Service Testing

Service Deployment

Service Management

Service Modeling

Service Development

Service creation process for IN services

Service Maintenance

Operations Support System

IN Service Deployment

Product development Requirements

SPECS IF : IF + : SLP: SDF: Physical plane

fault management

billing charging

delivery customer service

New services

SLP SDF

Building

Production

R&DPilots

( IF )

(IF+ )

Service Creation

IN Service Management

BUILDING

SUPPORT

Customer service

DELIVERY BILLING

PRODUCTION CHARGING

FAULT MANAGEMENTSCP

Delivery

system Filter Sort

Filter Sort

Product configur-

ation VIEW

Service Management

FaultBase

Prices

Billing DB

EventBase

Example of IN Service Creation

• Core INAP compliant service creation process• service analysis and modeling

– evaluation of interfaces between SLP and SSP/IP– service logic design– database structure and service data definitions– definition of managed service data– design of management user interfaces– CASE tools recommended

• service data functions– write definitions and service specific db-

actions for managed service data– service database creation

• service logic programming– service logic described with SDL– low level functions with C-language (e.g.

string operations, operating system services ...)

• service testing– SSP simulator, traffic generator and phones

• A very simple 700-service• simple number translation service

depending on the time of day e.g.– 9.00am - 7.00pm 700-hothothot calls are routed

to number +358 53 6243270– 7.00pm - 9.00am 700-hothothot calls are routed

to number +358 53 6243271

• if the service is not in use, an announcement is played

• billing is implemented in SSP

700-Number Beginning Time C-number Tariff / min700-408408408 09.00am +358 53 624 3270 1,5700-408408408 07.00pm +358 53 624 3271 3,5

From relational model . . .

to object model . . .

700-Numbers Use prohibited Restrictions700-408408408 No700-3584754837 Yes

700-numbers

Use prohibited

Restrictions

700-number

Beginning time

C-number

Tariff / min

• 700-service data modeling

mes s ageId=123Start

(wfDbTimer)

Not OK

wf_nt_res p

Announcement

db_nt_reques t

Not in us e

Connec tTo

Res ource

Re leas eCall

700-s ervice?

InitialDP

Re leas eCall

• Service logic design with SDL and coding with C(* CVOPS state-automaton for 700-service *)(* state input actions *)

idle InitialDP {

(* Call c-function that checks calledPartyNumber *) result=numberTranslationService() if(result==700SERVICE){ (* send query to database and wait for reply *) db_nt_request start(wfDbTimer) to(wf_nt_resp) } else if(result==SERVICE_NOT_IN_USE){ (* Play annoucement to user *) ConnectToResource messageId=123 PlayAnnouncement ReleaseCall to(idle) } else{ (* error *) ReleaseCall to(idle) }}

wf_nt_resp db_nt_resp {

stop(wfDbTimer) if(dbStatus==OK){ ...

IN Markets

• Market projections (OVUM Ltd, 1993)

• IN services will compromise in excess 30 % of Telco revenues by the year 2000

• Revenues from mobile services 25 - 33 % of total IN service revenues

• In fixed network 800, premium rate and VPN excess 75-80 % of IN service revenues

• The total market for IN equipment will reach US$7,9 billion in USA and US$4.8 billion in Europe by the year 2000

IN Markets

• The vast majority of capital will be spent on SSF/CCF functionality and SCP-related products

– competition rises prices fall dramatically– expect strategic partnerships and alliances

• Personal mobility (PCS) killer application ?• Liberation of Telco industry in Europe 1998

will fierce the competition• In the 21th century revenues from service

content, not access or transport network

IN technology in Europe

1995 1996 1997 1998 1999 2000

MrdECU

Platforms

Applications

Projects

IN Markets

Future of Telecommunications: Beyond IN .

TMN (Telecommunications Management Network)

• Total service, network element and customer management through open standard interfaces

• Supports distributed network management• IN+TMN+ODP = TINA (Telecommunications

Information Network Architecture)– supports customer oriented distributed services in

open distributed network

CAMEL (Customized Applications for Mobile network Enhanced Logic)

• GSM was originated before Intelligent Network (IN) and hence Intelligent Network features have been added to GSM later

• CAMEL is not a service but new architecture that enables creation of IN based services in GSM

• CAMEL architecture supports GSM phase 2+ and adds some Intelligent Network features to GSM network

• Supports Operator Specific Services globally and enables service roaming

• CAMEL is a Working Group relating to GSM, under the control of two Sub Technical Committees SMG3 WPC and SMG1 WPA in ETSI

• CAMEL is standardized in two phases– Phase 1 supports fast service creation and induces

limited call control features (subset of CS.1)

– Phase 2 supports extended features (including full CS.1)• In the first phase CAMEL feature supports

– Mobile originated and forwarded calls

– Mobile terminating calls

– Any time interrogation

– Suppression of announcements

BCSM Basic Call State ModelDP Detection PointEDP Event Detection PointGMSC Gateway MSCgsmSCF GSM Service Control FunctiongsmSSF GSM Service Switching FunctionHPLMN Home PLMNIPLMN Interrogating PLMNO-CSI Originating CAMEL Subscription InformationOSS Operator Specific ServiceSLPI Service Logic Program InstanceTDP Trigger Detection PointVPLMN Visited PLMN

CAMEL Abbreviations

HLRHLR gsmSCFgsmSCF

MAP CAP MAP CAP

IPLMN VPLMN

GSSF VLRVSSF

HLRHLR

CAMEL Architecture

• CAMEL Application Part (CAP) is a subset of ETSI Core INAP (CS.1) specified by ETS 300 374-1 on top of SS#7 TCAP

• CAP includes basic Mobile Application Part (MAP) operations

• CAP is used for call control between (V/G)SSF and gsmSCF

• CAP is specified by– Single/Multiple Association Control Function Rules

(SACF/MACF) for the protocol– Operations transferred between entities (given in

ASN.1)– Actions taken at each entity (given in SDL)

• Broadband and mobile IN• ATM-switched networks

– ATM-switch can be considered as Broadband SSP, BSSP

– SCP or SN manages virtual channels and paths– framework for sophisticated interactive services

• UMTS (Universal Mobile Telecommunications System)

– third generation mobile system (post DECT/GSM)

– integrates data services for mobile usage

– hierarchical cell structure• in-building ‘pico cells’, tens of meters• neighborhood ‘micro cells’, hundreds of meters• suburban ‘macro cells’, kilometers• global ‘satellite’, unlimited reach

– up to 2 Mbit/s throughput at 2 GHz band (pico)– routes IP-packets or ATM-cells to mobile users’

terminals– real implementations in 2001

• MBS (Mobile Broadband System)– evolutionary follow-up to UMTS (not a

replacement)– real broadband access for the mobile users– 34 Mbit/s at 60 GHz band– mobile interactive multimedia services

Intelligent Network - Summary

• Intelligent Network, IN offers• Open standards, vendor independence• Rapid service creation and deployment• Total network and customer management• Customized services to users• New opportunities to make business ie. new

markets and customers• Rapid adaptation to market needs and

competition Competitive edge

DocumentIN

Documents

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