The document discusses the design of call flow and control models in GSM networks using Wireless Intelligent Networks (WIN). It introduces WIN and how it is used to provide an independent, intelligent network for both mobile and fixed networks. It then describes how WIN connects and interacts with the components of a GSM network like BTS, BSC, MSC, HLR, VLR to control call flows and enable value-added services. The document provides a high-level overview of the call flow process between different network elements when a call is made from one subscriber to another.

1. WIRELESS INTELLIGENT NETWORK(WIN)FOR GSM
Mr. NIMAY CHANDRA GIRI, M-Tech

2. CONTENTS
• OBJECTIVE
• INTRODUCTION
• CONNECTION OF WIN WITH GSM NETWORK
• WIN ARCHETECTURE
• CALL FLOW MODEL
• CALL FLOW CONTROL BY WIN

3. OBJECTIVE
Design call flow and control model in Global
System for Mobile (GSM) network through
Wireless intelligent network (WIN).
 IN mainly two types(AIN & WIN) as depend on
network connection(wire line or wire less)
AIN used for fixed network(PSTN)
WIN used for mobile network(ISDN/IN)

4. INTRODUCTION TO WIN & GSM
 Wireless Intelligent Network (WIN) means “Intelligence” is taken out
from Switching center to connect computer nodes for reliable
operations.
 WIN is a separate & independent network for both mobile and fixed
network.
 SS7 used in Telecom network like PSTN,ISDN & IN.
 IN/WIN is a value added system.
 Applications are-call control, service control & connection control.
GLOBAL SYSTEM FOR MOBILECOMMUNICATIONS(GSM):-
 GSM developed by the ETSI to describe 2G digital cellular networks.
 GSM standard was developed as a replacement for 1G analog
networks.
 GSM expanded to include data & voice communications, further
improvements were 3G & 4G systems.
 GSM components are BTS,BSC,MSC(HLR,VLR,AUC),PSTN,ISDN&IN.

5. Connection of IN/WIN with GSM network

6. CALL FLOW MODEL WIN ARCHETECTURE

7. CALL FLOW CONTROL BY WIN
 Subscriber-A (calling party) dials the MSISDN(telephone no.) of subscriber –B (MSC)
 The signaling connection established between subscriber-A to GMSC through PSTN
step#1
 The GMSC receives the dialed number & find out the type of call and sent a inquiry
MSISDN to HLR (step#2) & HLR recover address of subscriber-B (i.e. from VLR) step#3
 Data base (HLR) sent a inquiry (IMSI) number to MSC for equipment identify & area
location MS –B (called party) step#4
 VLR ask to MSC to reserve this dialed number step#5
 MSC sent a mobile station roaming number(MSRN) to HLR for proceeding the call
step#6
 After conform of call oriented operation HLR sent request (MSRN) to GMSC for
connection of call party –A to B step#7
 After receiving MSRN from MSC , GMSC create a direct path to MSC by MSRN to set-
up call in between subscriber-A & subscriber-B step#8
 Call set-up completed. After the MS-B answer, speech connection is established & MS-
B start ringing.
 IN is used to control the call ,connection the call, call filtering, carries user voice and
data traffic from source to destination & value added service to network by the
protocol.
 All process are done by signaling system no.7 (SS7), it has also capability to initiate &
terminate the incoming call.

8. IN Standards &capability set (cs)
Q.1200 – Q.1208 IN-CS (service as call
control)
Q.1210 – Q.1219 IN-CS1 (services as call
forwarding)
 Q.1220 – Q.1229 IN-CS2 (services as Conference
calling, Call Hold, transfer and waiting.)
 Q.1230 – Q.1238 IN-CS3 ( services as Inter-
Network Service indicator
 Q.1240,1244,1248.1 IN-CS-4 (services as Multiple
points of control)

9. ADVANTAGES
• Takes less delivery time for services
• Fast services creation and termination
• Network is more stable
• Deliver high volume of data
• Can manage large no of devices application

10. CONCLUSION
 There are two overall standards employed today – CAMEL( up to 3G&4G)
and WIN( up to 2.5G/3G)
 Wireless Intelligent Networking allows the service provider to rapidly
introduce new services
 IN/WIN network is a fully independent network
 Maintaining and monitoring the Common Channel Signaling (CCS)
network is critical to its success
 Understanding and troubleshooting the SS7 protocol is a key part of that
success
 Features controlled out side the switch.

11. THANK YOU