Transport Protocol Data Unit
Message Types
SMS-SUBMIT, SMS-SUBMIT-REPORT, SMS-DELIVERY-REPORT, SMS-STATUS-REPORT, SMS-COMMAND.
Text Coding Schemes
The two text coding schemes that can be used in SMS are the GSM 7-bit default alphabet defined in [3GPP-23.038] and the Universal Character Set (UCS2) defined in [ISO-10646].
Text Compression In theory, the text part of a message may be compressed [3GPP-23.042]. However, none of the handsets currently available on the market support text compression. A message with compressed text cannot be displayed properly by an MS that does not support text decompression.
Message Classes
In addition to its type, a message belongs to a class. The TP-Data-Coding-Scheme (TP-DCS) parameter of the TPDU indicates the class to which the message belongs. It has to be noted that in most cases, a message does not belong to any of the four classes. In this situation the message is known as a no-class message and is usually handled as a class 1 or 2 message by the receiving SME.
Coding Groups
A message may belong to one of three coding groups. The coding group indicates what the receiving SME should do with the message once it has been read or interpreted.
Protocol Identifiers
The protocol identifier indicates how the receiving messaging application should handle an incoming Message (normal case, ME data download, SIM data download, etc.).
Message Types
SMS-SUBMIT, SMS-SUBMIT-REPORT, SMS-DELIVERY-REPORT, SMS-STATUS-REPORT, SMS-COMMAND.
Text Coding Schemes
The two text coding schemes that can be used in SMS are the GSM 7-bit default alphabet defined in [3GPP-23.038] and the Universal Character Set (UCS2) defined in [ISO-10646].
Text Compression In theory, the text part of a message may be compressed [3GPP-23.042]. However, none of the handsets currently available on the market support text compression. A message with compressed text cannot be displayed properly by an MS that does not support text decompression.
Message Classes
In addition to its type, a message belongs to a class. The TP-Data-Coding-Scheme (TP-DCS) parameter of the TPDU indicates the class to which the message belongs. It has to be noted that in most cases, a message does not belong to any of the four classes. In this situation the message is known as a no-class message and is usually handled as a class 1 or 2 message by the receiving SME.
Coding Groups
A message may belong to one of three coding groups. The coding group indicates what the receiving SME should do with the message once it has been read or interpreted.
Protocol Identifiers
The protocol identifier indicates how the receiving messaging application should handle an incoming Message (normal case, ME data download, SIM data download, etc.).
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