SMSC Technical Presentation Md. Zillur Rahman Deputy Manager(Operation)

Short Message Service Center  Supplied by Huawei  Developed by Huawei  SMSC GT 880150159999  SMSC Point Code 2208

SMSC Features  Mobile Originating Messaging  Mobile Terminating Messaging  Direct Mode  Store-and-Forward  Datagram Mode  Text Messaging

SMSC Features 

Concatenated Short Messages

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Scheduled Messages

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Message Expiry

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Delivery Reports

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Background Messaging

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Configurable Retry Algorithm

SMSC Features (Continued)  Black and White Lists  Anti Spamming  defines maximum number of messages to a single subscriber  Output Regulation  Link prevents overloading of Signaling  Input Protection  protects throttling of SMSC by burst of MO Traffic  Priority Messages

SMSC New Features  SMS over GPRS  Distribution Lists  MT spamming detection  SMPP 3.4

SMC in GSM Network

SMSC Architecture GSM Network

SIU

Huawei USAU ESME ESME SMPP, EMI, SEMA over TCP/IP or X.25

SMSC

Billing System OAM System ESME Prepaid System

SMSC System Architecture

Shot Message  A message is one of the following:  MO to SMSC   SMSC to MT SMSC to ESME  ESME to SMSC  Message Size - 160 7-bit characters - Concatenated SMS using Multiple Messages with UDH containing segmentation information 153 7-bit characters - Maximum 255 segments (Practically 5-6 segments)

Message Handling

MO SMSC MO Submit MO Response (Ack / Error) MT Deliver MT Response (Ack / Error) MT

Message Handling  MT Errors:  Unknown Subscriber (1)  Subscriber Mobile Switched off (24)  Tele Service not provisioned (11)  Memory Capacity exceeded (32)  HLR Does not reply after routing message sent (41)  MSC Does Not reply (48)

Retry Algorithm   How long SMS will be stored and How many times SMS will be retried is decided by the Retry Algorithm There is a configurable retry algorithm against each MT error.

Validity Period Processing • Retry algorithm • System Maximum validity period • Validity period set by subscriber • System default validity period

HLR Site MO

On-Net SMS Delivery

SMS-MO

Dhaka MSC

IDP

8 U

CON

8 U

SRI SRI-ACK

MT-ACK

SRI

MT-ACK SMS-MT SMS-MO SMS-MT

SRI-ACK

SCP Bogra MSC SMS-MT MT-ACK MT

MO

Off-Net SMS Delivery

GP GMSC

SMS-MO

Teletalk MSC

IDP

8 U SCP

SRI SRI-ACK SRI

SRI-ACK MT-ACK

SRI CON

8 U MT-ACK SMS-MT SMS-MO SMS-MT

SRI-ACK

GP MSC SMS-MT MT-ACK MT Site GP HLR

Thank You