12.Core+Equipment+in+GSM.doc

8/14/2019 12.Core+Equipment+in+GSM.doc

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Core Network in GSM __________________________________________________________________________________

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12 CORE NETWORK IN GSM

Core network of GSM consist of following elements

Mobile Intelligent Network

Mobile Switching Network

HLR/HSS

Short Massage Service Centre

Voice Massage Service Centre

MMS Server

GGSN/SGSN

Over he !ir Sol"tion #O !$

MOBILE INTELLIGENT NETWORK

IN is an architect"ral conce%t for the o%eration an& %rovision of new services '"ickl()fle*ibl() economicall( an& efficientl(+ he IN feat"re is &efine& as an architect"re where,intelligence, is se%arate& from core network switches an& %lace& in &istrib"te& networkno&es+ It s"%%orts the %rovision) control an& management of m"lti%le telecomm"nicationservices+

-rinci%le. he IN is an e*tension to the e*isting tele%hone network+ he network isorganise& so that the tele%hone calls receive& b( the IN are interr"%te& to '"er( a &atabase inor&er to &etermine what to &o with the call+ he call can then be re ro"te& base& on a n"mberof %re &efine& con&itions+

IN Conce%t"al Mo&el.

Service Plane

Global Functional Plane

Distributed Functional Plane

Physical Plane

0istrib"te& f"nctional frame.

CC!1. Call Control !ccess 1"nction223

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_CC1. Call Control 1"nction

SS1. Service Switching 1"nction

SC1. Service Control 1"nction

SR1. S%ecial Reso"rce 1"nction

S0-. Service 0ata 1"nction

SC61. Service Creation 6nvironment 1"nction

SM-. Service Management 1"nction

-h(sical -lane.

-h(sical -lane contains the -6s an& the interfaces between -6s

SC6 Service Creation 6nvironment

SM- Service Management -oint

SC- Service Control -oint

SS- Service Switching -oint

I- Intelligent -eri%heral

SM!- Service Management !ccess -oint

Global f"nctional %lane.

CC1 #call control f"nction$ this %rovi&es the basic call an& connection han&ling inthe e*change+ It establishes) mani%"lates an& releases the call+

SS1 #Service switching f"nction$ It enables interaction between CC1 an& SC1+ Itrecogni7es service control triggers) thro"gh which it recogni7es IN calls+ It manages thesignaling between the CC1 8 SC1+

SC1 #Service Control f"nction$ 0irects call control f"nctions &"ring the %rocessingof an IN call+ It contains the IN service call %rocessing logic store& in the s"bscriber&atabases which s%ecifies how to han&le an IN service re'"est+ It interacts with the SS1 an&th9e SR1 to obtain information re'"ire& to %rocess an IN call+ Sometimes the SC1 is s%lit intotwo f"nctional entities

S01# Service 0ata 1"nction$ the &atabase

SC1 #Service Control 1"nction$ : Call %rocessing an& other logic

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_Other f"nctions are

Collection of traffic an& network meas"rements an& sen&ing to SM1

Sen&ing of stat"s an& service maintenance messages to the SM1

Network management controls

Sen&ing of 4illing Information to the SS1

SR1 #S%eciali7e& Reso"rce 1"nction$: It is "se& whenever an IN call re'"ires &irectinteraction with the calling %art( in the s%eech %ath+ It contains the logic an& %rocessingca%abilit( to sen&) receive an& convert information

It has the following f"nctions

-la( !nno"ncement

Collect &igit

Voice recognition

Voice 4ack

SCEF (Service creation Environment Function) This function enables servicedevelopers to develop service lo ic! create and modify net"or# databases

Do"nloadin of service lo ic to the S$S

The purpose of SCEF is to create Service Pac#a es (SPs)% &n SP is a container forone or more ' Services

't contains

Service lo ic

Service data and service data schema

Specification of "hich data and statistics to collect durin service e ecution

SM1 #Service Management 1"nction$ : his f"nction is res%onsible for %rovisioningan& managing services create& b( the SC61 an& &ownloa&ing services 8 service relate& &atato the SC1 e'"i%ment

!%%l(ing changes to the global #service wi&e$ or s"bscriber &ata

0ownloa&ing service logic onto the SC1

Collection of service s"bsci%tion meas"rements

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_Receiving 8 logging "nsolicite& stat"s an& service management messages from SC1

-ro&"cing re%orts

Service &ata a"&its

he 1"nctional Mo&el &efines the entities in terms of f"nctions an& not in terms of %h(sical network elements+ he network elements which corres%on& to &ifferent f"nctionalentities are

SC1 SC- #Service Control -oint$

SR1 I- #Intelligent -eri%heral$

CC1/SC1 SS- #Service Switching -oint$

SC61 SC6 #Service Creation 6nvironment$

SM1 SMS #Service Management S(stem$

Network str"ct"re.

Network structure:-

IN service switching f"nctionalit( #SS1$ an& C!M6L Service Switching1"nctionalit( #gsmSS1$ can be incl"&e& in the network no&es GMSC Server an& MSC/VLRServer+ he IN service control f"nctionalit( #SC1$ can be co locate& in the same %h(sical

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12.Core+Equipment+in+GSM.doc