An SMS center (SMSC) is responsible for handling the SMS operations of a wireless network. When an SMS message is sent from a mobile phone, it will reach an SMS center first. The SMS center then forwards the SMS message towards the destination. SMS is carried by signaling channel (i.e.SDCCH) on the air interface from MS to BTS. Then SMS is transported by SS7 channel through BSC,MSC/VLR and SMSC. Refer GPRS tutorial for complete network architecture of GSM including elements used in SMS.

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  2. SMS Over LTE There are two main ways SMS can be delivered over LTE system. This is known as SMS over LTE. This can be delivered via Short Message Service Center referred as SMS-C.
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A Short Message Service Center (SMSC) is a network element in the mobile telephone network. Its purpose is to store, forward, convert and deliver Short Message Service (SMS) messages.

Smsc Network & Wireless Cards DriverSmsc Network & Wireless Cards driversSmsc Network & Wireless Cards drivers

The full designation of an SMSC according to 3GPP is Short Message Service - Service Center (SMS-SC).

Basic trajectories[edit]

SMS can be directed in several ways:

  1. From mobile to another mobile - referred to as MO-MT (Mobile Originated - Mobile Terminated)
  2. From mobile to a content provider (also known as Large Account / ESME) - referred to as MO-AT (Mobile Originated - Application Terminated)
  3. From application to a mobile - referred to as AO-MT (Application Originated - Mobile Terminated)


The tasks of an SMSC can be described as

  1. Reception of text messages (SMS) from wireless network users
  2. Storage of text messages
  3. Forwarding of text messages
  4. Delivery of text messages (SMS) to wireless network users
  5. Maintenance of unique time stamps in text messages

Smsc Network Diagram

When a user sends a text message (SMS message) to another user, the message gets stored in the SMSC (short message service centre), which delivers it to the destination user when they are available. This is a store and forward option.

An SMS centre (SMSC) is responsible for handling the SMS operations of a wireless network.

  1. When an SMS message is sent from a mobile phone, it will first reach an SMS centre.
  2. The SMS centre then forwards the SMS message towards the destination.
  3. The main duty of an SMSC is to route SMS messages and regulate the process. If the recipient is unavailable (for example, when the mobile phone is switched off), the SMSC will store the SMS CAR message.
  4. It will forward the SMS message when the recipient is available and the message's expiry period is not exceeded.

SMSCs can be used to interface with other applications, for example a spreadsheet can interface with the SMSC allowing messages to be sent SMS from an Excel spreadsheet, or to send an SMS from Excel. Inbound messages to a long number or short code can also be passed through the SMSC allowing m2m communications or Telematics.

Validity period of an SMS message[edit]

An SMS message is stored temporarily in the SMS center if the recipient mobile phone is unavailable. It is possible on most mobile handsets to specify an expiry period after which the SMS message will be deleted from the SMS center. Once deleted, the SMS message will no longer be available for dispatch to the recipient mobile phone (even if it comes on line). The validity period should be regarded by the handset user as a request, as the SMSC itself can be configured to ignore or otherwise handle message delivery schedules.

Message status reports[edit]

The SMS sender needs to set a flag in the SMS message to notify the SMS centre that they want the status report about the delivery of this SMS message. This is usually done by changing a Setting on the mobile handset.

See also[edit]

Smsc Network & Wireless Cards Drivers

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There are two main ways SMS can be delivered over LTE system.This is known as SMS over LTE.This can be delivered via Short Message Service Center referred as SMS-C.
• SMS Over SGs: Here LTE UE device sends and retrieves CS(Circuit Switched) based SMS messages.
• SMS Over IP:Here LTE UE device sends and retrieves SIP PS(Packet Switched) based SMS messages.

SMS over SGs transfer the messages between MSC and MME and transports the messages over LTE system usingSGs interface. In this type the LTE UE does not fall back to legacy cellular systems such as GSM or CDMA.Existing roaming conditions will be reused in this type of SMS over LTE.

In SMS over IP mode, SIP based SMSs are carried via IMS core element.In this type of SMS over LTE, SMS is to be transmitted is encapsulatedin a SIP message in IP-SM-GW entity. This type need LTE UE having both IMS and SIP protocol stack as wellas IP Short message gateway(IP-SM-GW), IMS core as well as HLR/HSS(home subscriber server) which supportsSMS over IP with the help of home routing.

LTE Mobile Originating SMS call flow-LTE UE SMS MO Call

Figure depicts the entire LTE mobile originating SMS call flow.SC(service center) is responsible for relaying and forwarding of the SMS.SMS-IWMSC is interworking MSC for SMS system. HLR/HSS stands forhome location register/home subscriber server.Let us understand LTE SMS MO Call procedure.

• After the EPS/IMSI attachment, LTE UE triggers service request in order toinitiate mobile originating SMS.
• SMS is encapsulated in NAS message and transmitted to MME entity.
• MME forwards this SMS to MSC/VLR.
• MSC/VLR acknowledges the receipt of SMS to LTE UE.
• SMS is forwarded to service center(SC) which returns delivery report back to UE as shown in step-7 and step-8.
• UE acknowledges receipt of dilvery report to MSC/VLR entity.
• MSC/VLR informs to MME that no more NAS messages are in the queue
• Release request is sent from MSC/VLR to MME.

LTE Mobile Terminating SMS call flow-LTE UE SMS MT Call

Figure depicts the entire LTE mobile terminating SMS call flow.The SMS retrived by LTE compliant UE from service center is referredas LTE SMS MT Call and SMS originated by UE is referred asSMS MO call. Let us understand SMS MT call procedure below.

• Service center starts the transmission of SMS.
• Based on routing information available with HLR SMS is forwarded to right MSC/VLR in the system.LTE UE is attached with this MSC/VLR.
• MSC/VLR initiates paging message to MME.
• The MME transmits paging message to each LTE eNodeBs on the tracking areas where in UE is registered.
• After success in paging, UE transmits SERVICE REQUEST message to MME.
• MME issues service request to MSC/VLR.
• MSC/VLR packetize the SMS and forward the same to MME.
• MME encapsulates SMS in NAS format and delivers to UE.
• LTE UE acknowledges receipt of SMS to MSC/VLR entity. It also issues delivery report.This report is forwarded to service center.
• MSC/VLR acknowledges receipt ofdelivery report to UE.It also informs MME about no NAS messages are left in the queue.
• Finally MSC/VLR initiates release request to MME.

CS MO MT Call flow in gsm

Refer Mobile Originated CS Call flow
Refer Mobile Terminated CS Call flow

Smsc Network & Wireless Cards Driver

PS MO MT call flow in gsm

Refer following links for PS call flow in gsm:
GSM downlink PS data call flow
GSM uplink PS data call flow
Circuit Switching vs Packet Switching

RF and Wireless Terminologies

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