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GSM Short Message Service

GSM Short Message Service. GSM Short Message Service. Can contain up to 140 octets, or 160 char. To allow messages longer than 160 char. SMS concatenation SMS compression SDCCH signaling channel Two type of GSM SMS Cell broadcast service Point-to-point service. 12.1 SMS Architecture.

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GSM Short Message Service

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  1. GSM Short Message Service

  2. GSM Short Message Service • Can contain up to 140 octets, or 160 char. • To allow messages longer than 160 char. • SMS concatenation • SMS compression • SDCCH signaling channel • Two type of GSM SMS • Cell broadcast service • Point-to-point service

  3. 12.1 SMS Architecture Figure 12.1 GSM short message service network architecture

  4. 12.2 SMS Protocol Hierarchy Figure 12.2 SMS MS-MSC protocol hierarchy (mobile origination)

  5. 12.2 SMS Protocol Hierarchy 12.2.1 Short Message Transfer Layer • Provides services to transfer SM-AL short msg. • Generate a reference number SMI (short message identifier) • SM-AL SMI is not carried between the MS and SM-SC • Four types of transfer protocol data units (TPDUs) • SMS-SUBMIT • SMS-DELIVER • SMS-STATUS-REPORT • SMS-COMMAND

  6. 12.2 SMS Protocol Hierarchy 12.2.2 Short Message Relay Layer • Provides services to transfer TPDUs and delivery reports for SM-TL • Generate SM-RL SMI for every short message • SM-RL SMI is mapped to and from SM-TL SMI • SM-RL SMI at the MS is not carried at the peer entity in the SM-SC • SM-RP consists of the following RPDU types: • RP-DATA • RP-SM-MEMORY-AVAILABLE • RP-ACK • RP-ERROR

  7. 12.2 SMS Protocol Hierarchy 12.2.3 Connection Management Sublayer • Provides services to support the SM-RL • MS has two SMC entities • MS-originated (MO) short message service • MS-terminated (MT) short message service • SM-CP consists of following protocol elements • CP-DATA • CP-ACK • CP-ERROR • MNSMS-ESTablish • To establish an MM-connection and transfer RPDU on that establish • MNSMS-DATA • Transfer an RPDU on MM-connection • MNSMS-RELease • MNSMS-ABORT • MNSMS-ERROR

  8. 12.3 Mobile-Originated Messaging • The logical message path is : • MS -> originating MSC -> IWMSC -> SM-SC Figure 12.3 Mobile-originated short messaging (part 1)

  9. 12.3 Mobile-Originated Messaging Figure 12.4 MM-connection establish for mobile-originated short messaging

  10. 12.3 Mobile-Originated Messaging Figure 12.5 Mobile-originated short messaging (part 2)

  11. 12.3 Mobile-Originated Messaging Figure 12.6 Mobile-originated short messaging (part 3)

  12. 12.4 Mobile-Terminated Messaging • The logical massage path is : • SM-SC -> GMSC -> terminating MSC -> MS Figure 12.7 Mobile-terminated short messaging (part 1)

  13. 12.4 Mobile-Terminated Messaging Figure 12.8 Mobile-terminated short messaging (part2)

  14. 12.4 Mobile-Terminated Messaging Figure 12.9 Mobile-terminated short messaging (part 3)

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