Intelligent Network.ppt

Overview of Intelligent Network Concepts • Motivation – offer new services quickly – thus more revenue – facilitates service differentiation

Distinction between Basic & Intelligent call processing • Basic call processing – caller dials number – the switching system decides how to process the call

• Intelligent call processing – caller dials number – the switching system decides whether to process the call or request assistance from external service logic – if external service logic assistance is required then – i. switching system sends a message to external service logic – ii. external service logic processes message and informs switching system how to process the call

• Enabling the switching system to access external service logic is principle of intelligent networks

Development of Intelligent Network Concept • Stage 1 – Logic and data needed to implement a service separated from switching system – Very service dependent, however better service management, maintenance and control resulted

• Stage 2 – Interface between the switching system and 'intelligent' service processing was standardised – Based on SS7 – Still service dependent

• Stage 3 – Open call processing environment – Flexible service-independent systems

Physical Elements Service Switching Point (SSP) – Switch with intelligence to recognise when call processing at external service control point (SCP) is required – Implemented using 'triggers' – Switching system can be equipped with – i. originating triggers - operate at the originating switching system during call set-up – ii. mid-call triggers - operate during speech phase of a call – iii. terminating triggers - operate at the terminating switching system during call setup

SSP Continued • On recognition of a trigger a message is sent to a Service Control Point (SCP) – The response to message will inform the switching system how to proceed – e.g. terminate the call – collect more information

• Note the triggers are defined by the Intelligent Network Call Model

• Service Control Point (SCP) – The Service Control Point invokes Service Logic Programs (SLPs) in response to messages from switching system – Multiple Service Logic programs (SLPs)

• Adjunct Processor (AP) – Similar to Service Control Point (SCP) • but local to switching system • and connected by a high-speed link.

Intelligent Peripheral (IP) • Handles specialised interactions between the user and the intelligent network. • Intelligent processor has resources such as tones, announcements, voice recognition – e.g. Service Control Point may instruct switching system to route a call to an Intelligent – Peripheral. The IP will interact with the user to obtain more information. This information – is forwarded to the Service Control Point

Service Node (SN) • Essentially a combined Service Control Point (SCP) and Intelligent Peripheral (IP)

Service control point Service data point(SDP) SCF SDF SDF

T o other SCPs and/or SDPs in this or another network. Adjunct (AD) Intelligent peripheral (IP)

CCITT No. 7 signalling network

SRF

SCF

SDF Service Switching Point (SSP)

Network Access Point (NAP)

Service node (SN) SCF

SRF

SCF SSF

SSF

CCF

CCF

CCF SDF CCAF

SDF

CCAF

SRF

optional functional entity

transport

signalling

Functional entities (FEs)

Physical entities (PEs)

Interfaces

CCF call control function CCAF call control agent function SCF service control function SDF service data function SAF special resource function SRF specialised resource function SSF service switching function

AD adjunct IP intelligent peripheral NAP network access point SCP service control point SDP service data point SN service node SSCP service switching and control point SSP service switching point

SCP - SSP AD - SSP IP - SSP SN - SSP SCP - IP AD - IP SCP - SDP

Figure 2 Possible physical architecture

Intelligent Network Concepts Applied to Mobile Cellular networks

Service Control Point (SCP)

Service Data Point (SDP)

Intelligent Peripheral (IP)

Adjunct Signalling System 7 (SS7)

Service Node (SN)

Service Switching Point (SSP)

Terminal Equipment (TE)

Figure 6.1 Intelligent Network Model

Service Switching Point (SSP)

To Base Station Controller

Mobile Switching

VLR

Centre

Signalling Control Point (SCP)

HLR SS7

* STP

EIR AC

To Base Station Controller

Mobile

VLR

Switching Centre

* Signalling Transfer Point

Intelligent Network View of a Mobile Cellular Network