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					                                   INTRODUCTION



       The mobile device users are increasing very rapidly so people need more services.

With the improving wireless technologies, Multimedia Messaging on Wireless Networks

became available in GSM. To support multimedia communication between mobile device

users, Multimedia Messaging Service has been defined as standard.



       Multimedia Messaging Service is a non-real time communication service, supporting

users to send or receive images, sound, and video together with text messages. At first, I have

found the papers “Wireless based Multimedia Messaging System” prepared by Jerry Zeyu

Gao, Gauri Durve, Sirisha Alam, Simon Shim and “MMS – The Modern Wireless Solution for

Multimedia Messaging” prepared by Miraz-E-Mostafa to start analyzing MMS. In common,

these papers give details of MMS functionalities and features, architecture, message structure,

encoding, information flow, transport of MMS.



       In order to understand well enough how MMS works, I wanted to go through the

previous stage of it; Short Message Service (SMS). The paper written by G. Peersman and S.

Cvetkovic, “The Global System for Mobile Communications Short Message Service”

published in IEEE Personal Communications Journal, June 2000, analyzed well the SMS with

in GSM.



       In the next section, you can find the summary of what I have learnt so far in my

research on these papers.




                                              1
                                       FIRST FINDINGS



       I have written about the significant increase of mobile device users and the Multimedia

Messaging Service is a standard for supporting extended service for these people. Actually,

MMS is an evolution of Short Messaging Service.

       SMS has been very successful before 3rd generation (3G) of wireless communication

systems. Unfortunately, it has both limitations and short comings when we compare with 3G

standards. Users can only send maximum of 160 alphanumeric characters in one short

message. This was very good for 2G, but not enough for 3G. So what are 2G and 3G wireless

technologies?

       2G wireless networks are digital networks (for spectral efficiency and not for digital

services). The characteristics of it are; maximum data rates of 9.6 kbits/second to 14.4

kbits/second if you are in just the right place, Digital voice (results in a lower quality voice

but uses less precious spectrum), enhanced telephony features such as caller-id, services such

as text based messaging (big winner), downloads of still images and audio clips, etc.

       3rd generation technology is used in the context of mobile phone standards. 3G

networks are wide area cellular telephone networks which evolved to incorporate high speed

internet access and video telephony.

       According to these standards SMS was very successful for 2G networks as I

mentioned above. In the journal SMS within GSM, the functionalities and features are well

defined and I want to go through on SMS, which is defined in it. First of all, delivery of the

message is guaranteed even when the cellular terminal is unavaible that is because of SMS

uses store and forward approach. The network will hold the message and deliver it shortly

after the cellular terminal announces its presence on the network. An other fact of SMS is that

it supports international roaming with very low latency makes it particularly suitable for



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applications such as paging, email and voice mail notification, and messaging services for

multiple users.

       There are two types of SMS; the cell broadcast and point-to-point. In cell broadcast, a

message is transmitted to all active handsets or mobile stations present in a cell that have the

capability to receive SMS. In point-to-point type, SMS is sent from one mobile to another, PC

to mobile or vice versa which is maintained by Short Message Service Center (SMSC).

       SMSC is an electronic form of ordinary mail postal service that stores and forwards

the messages when they can be delivered. Each GSM network should have at least one SMSC

to check, organize and send the message to the operator.

       What about the GSM network architecture (shown below in Figure 1)? This consists

of Mobile Station (MS), Base Station Subsystem (BSS) and the Network Subsystem and

common for both SMS and MMS. Mobile Station consists of physical terminal and contains

the radio transceiver, the display and digital signal processors and Subscriber Identity Module

(SIM). SIM allows users to access a network and provides subscribed services for them.

       The BS is composed of two parts; base transceiver station (BTS), base station

controller (BSC). These two communicate across the specified Abis Interface. BTS defines

the cell, handle radio link protocols with MS. Depending on the number of MSs in a particular

area, the number of BTSs can change.

       BSC handles radio channel setup, frequency hopping, and handoffs. BSC is a

connection between MS and MSC. The BSC is also converting 13kbits/s voice channel (used

by the radio link) to the standardized 64kbits/s (used by the Public Switched Phone

Network(PSTN)).

       The Network Subsystem is mainly developed on Mobile Switching Center, which

takes care of registration, authentication, location updating, handovers, and routing to a




                                               3
roaming subscriber. Plus, it acts as a gateway to the PSTN or ISDN (Integrated Services

Digital Network).




              Figure 1: The basic GSM architecture



       When we come back to analyzing MMS, we will see this is the architecture for it also,

as it is same in GSM networks, but as an extra we need MMS user database server. This is

because of that MMS also uses store and forward approach like in SMS.

       At the end of my first findings, I want to add the figure 2, which shows the system

architecture of Mobile – MMS.




       Figure 2: Mobile- MMS system architecture




                                              4
                      OUTLINE FOR THE FINAL REPORT



       I have covered the general topics for the GSM, SMS and MMS including 2G and 3G

networks. Now I am planning to go into details of GSM protocol architecture, SMS network

architecture, how messages are send/received, and practical implementations on the first side.

       Then, I am going to discuss the system design, message structure and encoding,

information flow and transport of MMS.

       These are going to be strength by analyzing the system performance evaluation results

done by Jerry Zeyu Gao, Gauri Durve, Sirisha Alam, Simon Shim in the paper “Wireless

based Multimedia Messaging System”.

       Lastly, I am going to deal with ongoing works and current position MMS in Wireless

Network.

       Additional papers and subjects can be added to those topics according to the necessity.




                                              5
                              EXPECTED RESULTS
      I am not going to make any simulations so there are no expected results to get. Only

there will be the analyze of system performance evaluation done by Jerry Zeyu Gao, Gauri

Durve, Sirisha Alam, Simon Shim, which includes user login, send MM message (image),

send MM message (audio), read MM message (image) and read MM message(audio).




                                           6
REFERENCES

[1] Jerry Zeyu Gao, Gauri Durve, Sirisha Alam, Simon Shim, “Wireless based Multimedia
Messaging System”, IEEE International Conference, (CEC/EEE’06),
http://www.ieeexplore.ieee.org/iel5/10920/34369/01640334.pdf?tp=&arnumber=1640334&is
number=34369

[2] MMS – The Modern Wireless Solution for Multimedia Messaging, Miraz-E-Mostafa
http://www.ieeexplore.ieee.org/iel5/8098/22425/01046587.pdf?tp=&arnumber=1046587&isn
umber=22425

[3] G. Peersman and S. Cvetkovic, “The Global System for Mobile Communications Short
Message Service”, IEEE Personal Communications, pp. 15-23, June 2000

[4] Miraj-E-Mostafa, “Circuit-Switched Mobile Multimedia Telephony – Terminal
Requirements and Call Control”, in Proceeding of the 3 rd International Symposium on
Wireless Personal Multimedia Communications 2000 (WPMC 2000), Bangkok, Thailand,
vol. 2, pp. 994-999, November 2000

[5] WAP 205, “Multimedia Messaging Service Architecture Overview Specification”
http://www.openmobileallience.org/tech/affiliates/wap/wap-205-mmsarchoverview-
20010425-a.pdf

[6] WAP 209, “Multimedia Messaging Service Encapsulation Protocol”
http://www.wmlclub.com/does/especwap2.0/WAP-205-MMSArchOverview-20010425-a.pdf

[7] WAP 206, “Multimedia Messaging Service Client Transactions Specification”
http://www.openmobilealliance.org/tech/affiliates/wap-206-mmsctr-20020115-a.pdf

[8] http://www.activexperts.com/activsms/sms

[9] http://www.pulsewan.com/data101/gsm_basics.htm

[10] http://en.wikipedia.org/wiki/Multimedia_Messaging_Service

[11] CMPE549 Wireless LANs Lecture Notes, prepared by Dr. Salamah




                                               7

				
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