Short Message Service Center

from Wikipedia, the free encyclopedia

A short message service center ( SMSC ) is a component of a GSM - UMTS - or LTE - mobile network . It is responsible for storing, forwarding, converting and delivering messages from the Short Message Service .

The full name in the 3GPP specification documents is Short Message Service - Service Center ( SMS-SC ).

function

The functions and capabilities of an SMS-SC to be implemented are only briefly specified by the 3GPP, the protocols to be used only specified in the form of a non-binding proposal.

The term SMSC is often used for the entire transmission chain for short messages within the cellular network.

The actual SMS-SC takes on the following tasks:

  • Delivery of short messages to mobile users
  • Receipt of short messages from mobile users
  • Processing of the delivery confirmation of messages from the MSC
  • Processing of the delivery confirmation of messages from the fixed network
  • Observance of the validity period in the messages
  • Creation of a unique time stamp in short messages
  • Sending delivery confirmations to mobile users
  • Sending of delivery confirmations to the fixed network
  • Overwriting of short messages in mobile devices

shipping

A short message sent by a terminal in the cellular network is referred to as SM MO ( Short Message Mobile Originated ). The resulting processes are:

  • The message is from the terminal to the MSC transmitted
  • The MSC obtains information from the VLR about the sending subscriber. These can consist of information about the blocking of the participant or booked additional services
  • If the information received does not conflict with this, the MSC forwards the message to an SMS-IWMSC ( SMS-InterWorking MSC )
  • The SMS-IWMSC obtains information about the message path to be used from the HLR of the target subscriber
  • The SMS-IWMSC forwards the message to a suitable SMS-SC

reception

A short message that a terminal device receives in the cellular network is referred to as SM MT ( Short Message Mobile Terminated ). The resulting processes are:

  • The message to be delivered is in the SMS-SC
  • The SMS-SC forwards the message to an SMS-GMSC ( SMS gateway MSC )
  • The SMS-GMSC obtains information about the message path to be used from the HLR of the target subscriber
  • The SMS-GMSC delivers the message to the responsible MSC
  • The MSC obtains information from the VLR about the receiving subscriber. These can consist of information about the blocking of the participant or booked additional services
  • If the information received does not conflict with this, the MSC delivers the message to the end user
  • The terminal generates a receipt upon request
  • The MSC forwards the acknowledgment of receipt of the SMS GMSC further
  • The SMS-GMSC forwards the receipt to the SMS-SC
  • The SMS-SC generates a delivery confirmation for the sending subscriber. This is delivered in the same way as a normal short message

Short messages can also be forwarded from a network element in the IP network to an SMS-SC using the UCP or SMPP protocols . This option is used by mobile network operators to send automatically generated short messages for information or as part of value-added services to mobile network subscribers.

Transmission protocols for short messages

For the transmission of short messages has European Telecommunications Standards Institute ( English European Telecommunications Standards Institute , ETSI) following network protocols standardized.

Individual evidence

  1. ↑ 3GPP TR 21.905: Vocabulary for 3GPP Specifications ( English , ZIP / DOC; 131 kB) December 19, 2009. Accessed January 5, 2010.
  2. ↑ a b 3GPP TS 23.040: Technical realization of Short Message Service (SMS), chap. 6: Service Center functionality ( English , ZIP / DOC; 1.0 MB) September 28, 2009. Retrieved January 5, 2010.
  3. ↑ 3GPP TS 23.040: Technical realization of Short Message Service (SMS), Annex A (informative): Protocol stacks for interconnecting SCs and MSCs ( English , ZIP / DOC; 1.0 MB) September 28, 2009. Accessed January 5 2010.
  4. ↑ 3GPP TS 23.040: Technical realization of Short Message Service (SMS), chap. 10.2: Short message mobile originated ( English , ZIP / DOC; 1.0 MB) September 28, 2009. Accessed January 5, 2010.
  5. ↑ 3GPP TS 23.040: Technical realization of Short Message Service (SMS), chap. 10.1: Short message mobile terminated ( English , ZIP / DOC; 1.0 MB) September 28, 2009. Retrieved January 5, 2010.
  6. ↑ Computer Interface to Message Distribution (CIMD) from Nokia ( Memento of the original from March 2, 2006 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.forum.nokia.com