6) for GSM TS – Technical realization of the Short Message Service (SMS ) or the SGSN is described in TS , and is dealt with in that specification. PID, Protocol Identifier, Parameter showing the SMSC how to process the SM (as FAX, Voice etc) . (For further information see GSM chapter ). TP-PID: TP-Protocol-Identifier. . This document gives only a very simple description of SMS in PDU mode. . See GSM TP-PID complete definition. 1 0.
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Its 3 least specificatikn bits have the following meaning:. The following 3 octets contain a relative validity period in hours, minutes and seconds as the 3rd to 5th octet of time format.
However, the validity period is usually limited globally by the SMSC configuration parameter— often to 48 or 72 hours. This format is used throughout the whole transfer of the message in the GSM mobile network. This document describes the process of sending SMS messages between a mobile phone and the M20 Terminal.
In this example, the gdm zone, 8A is binary The length of the phone number is odd 11therefore a trailing F has been added, as if the phone number gm “F”. The TP-DCS octet has a complex syntax to allow carrying of other information; the most notable are message classes:.
Such message may be sent only if the original message had this flag cleared and the new message must speciffication sent with the flag set. The PID is the information element by which the Transport Layer either refers to the higher layer protocol being used, or indicates interworking with a certain type of telematic device.
In the second case, the VP comprises 7 octets, giving the absolute time of the vality period termination. The absolute format is identical to the other time formats in GSM The phone number in semi octets Retrieved from ” https: The octet is then coded as follows:.
Other addresses are carried by lower layers. Type-of-address of the SMSC. Messages sent via this encoding can be encoded in the default GSM 7- bit alphabet, the 8-bit data alphabet, and the bit UCS-2 alphabet. The SMS message can be deleted from memory eg.
Bit 3 is 1, therefore the time zone is negative. When this alphabet is used, eight characters of the message are packed in seven octets, and the message can consist of up to characters instead of characters in 8-bit data coding.
Technical introduction to SMS messaging
Length of phone number The “00” value here lets the phone set the message reference number itself. Default alphabet indicates that the UD User Data is coded from the 7-bit alphabet given in appendix A.
Languages which use Latin scriptbut use characters which are not present in the GSM 7-bit default alphabet, often replace missing characters with diacritic marks with corresponding characters without diacritics, which causes not entirely satisfactory user experience, but is often accepted. In time the Class 2 is supported, if you choose Class 1 or Class 3 the short message is treated the same way as a Class 2 message.
Having “02” instead of “00” here, would indicate that specificaton TP-User-Data field of this message should be interpreted as 8bit rather than 7bit used in e. To read the SMS message, select [Read Messages] from the [Mail] menu using the left or right arrow button and the new message is usually shown first.
SMS messages and the PDU format
The value of 1 in the bit 6 of the first octet means that the message is Single-shot. A special DCS values also allows message compressionbut it perhaps is not used by any operator. Message Waiting Indication group of DCS values can set or reset flags of indicating presence of unread voicemailfaxe-mail or other messages.