Protocol Analysing through Media Gateway by asifsindhri


More Info
									Protocols Analysis Through Media Gateway (MGW)

Problem Statement
•2G MSC couldn’t understand the signaling format over Iu-Cs interface.

MGW as a Signaling Gateway

SIGTRAN (Signaling Transport)

The SIGTRAN protocol includes: • SCTP (Stream Control Transmission Protocol)
• M2PA (MTP 2 Peer to Peer Adaptation Layer) •M2UA (MTP 2 User Adaptation Layer) •M3UA (MTP 3 User Adaptation Layer) •SUA (SCCP User Adaptation Layer)

Need Of SCTP

Multi Homing

Multi Streaming

MGW for IMS (IP Multimedia Subsystem)

Multimedia gateway can also be used for providing the link between the IP multimedia subsystem (IMS) and associated packet-switched core networks, and circuit-switched networks such as the PSTN or other mobile networks.
This link is necessary for setting up calls between IP-based session initiation protocol or SIP-capable mobile terminals and conventional terminals that cannot handle the SIP signalling.

IMS Architecture
• CSCF (Call Session Control Function)

• S-CSCF (Serving Call Session Control)
• I-CSCF (Interrogating Call Session Control) • P-CSCF (Proxy Call Session Control)

• HSS (Home Subscriber Server)
• SIP Application Server • BGCF (Breakout GW Control Function) • MRF (Media Resource Function) • SBC (Session Border Control) • MGCF (Media GW Control Function)

SIP (Session Initiation Protocol)

The Session Initiation Protocol (SIP) is an application-layer signaling-control protocol used to establish, maintain, and terminate multimedia sessions. Multimedia sessions include Internet telephony, conferences, and other similar applications involving such media as audio, video, and data.

Components Of SIP • User Agents • Client • Server

Addressing sip:4085262222@

Network Servers
Redirect Server

Proxy Servers

H.248 (Megaco)
• What is H.248?

• The Connection Model
Context Terminations Commands Transactions Messages Packages

Keeping in mind about the economic tension and recession, telecom operators are hesitating in deploying 3G networks / 4G networks. In my opinion it is better to increase the number of timeslots as the user demands high bandwidth keeping the same network while Media Gateway playing an important role in converting SS7 in to IP through SIGTRAN . MGW plays an important role in connecting Mobile Core Networks such as WCDMA , GSM RAN , PSTN Networks . In a 3G circuit switched core network , the multimedia gateway offers the possibility to connect a third generation radio access network to a second generation mobile switching center , thus effectively transforming the 2G MSC into a 3G MSC and in future it will require a minimal or no hardware changes.


Real Time Traffic Monitoring System

Problem Statement
• There is no Real time traffic reporting • Mechanism available involve human interference • Unavailable 24x7

Working Diagram

Image Acquisition

Greyscale image and highlighted region

Pixel values in highlighted region

Image Processing
• Storage Classes • Images type
• • • • Indexed image Intensity image Binary image RGB image

Images type

Traffic Congestion Calculation

• Average area occupied by vehicle

• Average velocity of traffic

Average Area Calculation

Average Velocity Calculation

SMS Generation
• PDU mode • TEXT mode

Sending PDU format

Receiving PDU format
Octet(s) Description




Length of the SMSC information (in this case 7 octets)


Type-of-address of the SMSC. (91 means international format of the phone number). (see APPENDIX B)

72 83 01 00 10 F5

Service center number (in decimal semi-octets). The length of the phone number is odd (11), so a trailing F has been added to form proper octets. The phone number of this service center is "+27381000015". See below.

04 0B C8

First octet of this SMS-DELIVER message. (see APPENDIX B) Address-Length. Length of the sender number (0B hex = 11 dec) Type-of-address of the sender number. (see APPENDIX B)

72 38 88 09 00 F1

Sender number (decimal semi-octets), with a trailing F

00 00

TP-PID. Protocol identifier. (see APPENDIX B) TP-DCS Data coding scheme (see APPENDIX B)

99 30 92 51 61 95 80

TP-SCTS. Time stamp (semi-octets) (see APPENDIX B)


TP-UDL. User data length, length of message. The TP-DCS field indicated 7-bit data, so the length here is the number of septets (10). If the TP-DCS field were set to indicate 8-bit data or Unicode, the length would be the number of octets (9).

E8329BFD4697D9EC 37

TP-UD. Message "hellohello" , 8-bit octets representing 7-bit data. (see APPENDIX B)

Future vision
• In the next phase, the system can be extended to the large scale in the city. Using the map and traffic load information one can reach his destination in short time, by passing the jammed traffic signals. The system can be upgraded to find the best possible route from one place to another via SMS, which will contain the traffic signals on that route having minimum traffic rush.


In future, the system can be used for different applications like it can be used to measure the rainfall level at different places in the city and the most important it can be used very effectively for security and surveillance purposes.

• Image acquisition is not properly done • When load on SMSC is above 60% • Time stamp is above 5 hours


To top