Short Message in PDU Encoding.pdf - Read

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3. Message Reference (MR) The MR field gives an integer representation of a reference number of the SMS-SUBMIT. The MR is automatically incremented from 0 to 255 for each SMS-SUBMIT by the application. After each SMS-SUBMIT has been submitted to the network, the Last-Used-MR value in the SIM is updated with the MR that was used in the SMS-SUBMIT operation. The value in the MR assigned by the MS is the same value which is received at the SC. Example MR: 0x00 4. Destination Address (DO) or Origination Address (DA) Address field indicates the phone number of the recipient for SMS-SUBMIT or sender for SMS-DELIVER. Address field consists of 3 parts: • Address Length expressed in number of digits It specifies the total number of digits in the phone number itself excludes Type of Address in hex value. • Type of Address It provides the instruction on the interpretation of the phone number. 0x91 is used for international numbering and 0x81 is used for national numbering. • Address Value This is a phone number entry in BCD format (each pair of digits is swapped) which excluding the “+” sign if international phone number prefix is used. “F” is filled at the end of the phone number if the Address Length is an odd number before BDC formatting is performed. Example: Destination Address or Origination Address Phone number Address Length Type of Address Address Value (BDC format) DO or DA 94751802 0x08 0x81 49578120 088149578120 +6597481802 0x0A 0x91 5649578120 0A915649578120 01222312345F 0x0B 0x81 1011322143F5 0B811011322143F5 +60173456789F 0x0B 0x91 0671436587F9 0B910671436587F9 5. Protocol Identifier (PID) The PID field serves the purpose which the Transport Layer either refers to the higher layer protocol being used, or indicates interworking with a certain type of telematic device. Although there are a lot of PID definitions (refer to GSM 03.40 section), 0x00 is used. This informed SC that the PDU message must be treated as short message. Example: PID: 0x00 6. Data Coding Scheme (DCS) Coding Group bits Use of bits 7 6 5 4 3 2 1 0 0 0 X X General Data Coding indication Bits 5..0 indicate the following : Bit 5 Compress/ uncompressed text 0 Indicates the text is uncompressed
1 Indicates the text is compressed using the GSM standard compression algorithm Bit 4 Presence of message class 0 Indicates that bits 1 to 0 are reserved and have no message class meaning 1 Indicates that bits 1 to 0 have a message class meaning Bit 1 Bit 0 Message Class 0 0 Class 0 (immediate display) 0 1 Class 1 (ME specific) 1 0 Class 2 ( SIM specific) 1 1 Class 3 (TE specific) Bits 3 and 2 indicate the alphabet being used, as follows : Bit 3 Bit 2 Alphabet 0 0 Default alphabet (7bit) 0 1 8 bit data 1 0 UCS2 (16bit) 1 1 Reserved NOTE: The special case of bits 7..0 being 0000 0000 indicates the Default Alphabet as in Phase 2 0 1 0 0..1 0 1 1 Reserved coding groups 1 1 1 1 Data coding/message class Bit 3 is reserved, set to 0 Bit 2 Message coding 0 Default alphabet 1 8-bit data Bit 1 Bit 0 Message Class 0 0 Class 0 (immediate display) 0 1 Class 1 (ME specific) 1 0 Class 2 ( SIM specific) 1 1 Class 3 (TE specific) Default alphabet indicates the UD is coded in 7-bit alphabet format with refer GSM Default Alphabets table. When this coding is used, eight characters of the message are packed in 7 octets result a maximum of characters of 160 in a message. 8 bit data indicates the UD is coded in 8-bit format and result a maximum of characters of 140 in a message. UCS2 data indicates the UD is coded in 16-bit format and a maximum of characters of 70 in a message.
Page 1 and 2: Short Message in PDU Encoding A. In
Page 3 and 4: (Optional) (Optional) Overview: SMS
Page 5: 4 3 VPF 2 RD 2 1 0 MTI MMS (Set by
Page 9 and 10: Example: 0xAA: 170 in decimal: (170
Page 11 and 12: C. Examples for complete PDU Short
Page 13: Note: Read message 0691566948956904

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