SMSC Technical Presentation

Md. Zillur RahmanDeputy Manager(Operation)

Short Message Service Center

Supplied by HuaweiDeveloped by HuaweiSMSC GT 880150159999SMSC Point Code 2208

SMSC Features

Mobile Originating Messaging

Mobile Terminating Messaging

Direct Mode

Store-and-Forward

Datagram Mode

Text Messaging

SMSC Features

Concatenated Short MessagesScheduled MessagesMessage ExpiryDelivery ReportsBackground MessagingConfigurable Retry Algorithm

SMSC Features (Continued)

Black and White ListsAnti Spamming defines maximum number of

messages to a single subscriberOutput Regulation prevents overloading of Signaling

Link Input Protection protects throttling of SMSC by burst of

MO TrafficPriority Messages

SMSC New Features

SMS over GPRSDistribution ListsMT spamming detectionSMPP 3.4

SMC in GSM Network

SMSC Architecture

GSMNetwork SMSC

SIU

SMPP, EMI , SEMA overTCP/ IP or X.25

ESME ESME

Billing System Prepaid SystemOAM System

Huawei USAU

ESME

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 MT

MO Submit

MO Response(Ack / Error)

MT Deliver

MT Response(Ack / Error)

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

On-Net SMS DeliveryDhaka MSC

Bogra MSC

8 U

8 U

Site

SCPHLR

MO

MT

SMS-MOSRI

SRI-ACK

SRI

SMS-MT

SMS-MT

SMS-MT

SMS-MO

SRI-ACK

IDP

CON

MT-ACK

MT-ACK

MT-ACK

Off-Net SMS DeliveryTeletalk MSC

GP MSC

8 U

8 U

Site

SCP

GP HLR

MO

MT

SMS-MOSRI

SRI-ACK

SRI

SMS-MT

SMS-MT

SMS-MT

SMS-MO

SRI-ACK

IDP

CON

GP GMSC

SRI SRI-ACK

MT-ACK

MT-ACK

MT-ACK

Thank You