GSM Short Message Service

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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 (SDCCH (Standalone DCCH) for signaling (authentication, registration, etc)) Two type of GSM SMS Cell broadcast service Point-to-point service

12.1 SMS Architecture Figure 12.1 GSM short message service network architecture

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

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

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

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

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)

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

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

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

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)

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

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