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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If the time zone offset is negative specificaation Western hemisphere bit 3 of the last octet is set to 1. They are not stored in the phone, they just displayed on the phone display. The TP-DCS octet has a complex syntax to allow carrying of other information; the most notable are message classes:.

SMS Messaging

It has always 7 octets, although some of them are not used. If the originator and the recipient home networks differ, the reply would go through another SMSC then usually.

One octet includes two BCD-digit Fields. Default sprcification indicates that the UD User Data is coded from the 7-bit alphabet given in appendix A. 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.

The number itself must always start with a country code and must be formatted exactly according to the Sepcification. Note that you need the phone number for SMS messages.

The absolute format is identical to the other time formats in GSM Here the length is 0, which means that the SMSC stored in the phone should be used. The MR field gives an integer Time zone is given in quarters of an hour. The phone is now ready for sending and receiving SMS.

The UDL field gives an integer representation of the number of characters within the User Data field to follow. 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. When the message encoding is GSM 7-bit default alphabet and a UDH is present, fill bits are inserted to align start of the first character of the text after UDH with septet boundary.

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The content of the message its text when the message is not a binary one is carried in the TP-UD field. Message Waiting Indication group of DCS values can set or reset flags of indicating presence of unread voicemailfaxe-mail or other messages. Note that this has the length 10 Awhich is even.

Bit 3 is 1, therefore the time zone is negative. A special DCS values also allows message compressionbut it perhaps is not used by any operator. Other addresses are carried by lower layers. However, SMS message can be sent out or received in a similar fashion using specificatikn mobile phones. In this case the number must adhere to the mobile operator’s dial planwhich means that international numbers must have the international prefix 00 in most countries, but in the USA before the country code and numbers for long-distance calls must start with the trunk prefix 0 in most countries, 1 in the Specificatioj followed by a trunk code.

GSM – Wikipedia

Alphabet indication Unspecified message handling at the MS Default alphabet 7 bit data coding in the User Data reserved. User data length, length of message. This octet is optional.

This behaviour was designed for older mobile phones which don’t understand UDH; such mobile phones might display the UDH as a jumble of strange characters; if the first character after UDH was Carriage Return CRthe mobile phone would rewrite the mess with the rest of the message.

How to do the transformation from 7bit septets into octets is shown here. This octet is optional, see bits 4 and 3 of the first octet.

In all octets the values are stored in binary coded decimal format with switched digits number 35 is stored as 53 hex.

However, the original name is often used to refer even to the 3GPP document. The phone number in semi octets When there is a new SMS message arrived, the phone will beep and the SMS message indicator will appear on the phone screen.


Insert a SIM card into the mobile phone and turn the phone on. Partners Contact us Sitemap. Sppecification same was also true for other languages using non-Latin scripts like Russian, Arabic, Hebrew and various Indian languages.

Spdcification von Kurznachrichten mittels PDU.

The MSC usually does not close the connection to the mobile phone and does not end the MAP dialogue with the SMSC, which allows faster 34.0 of subsequent messages or message segments. However, the validity period is usually limited globally by the SMSC configuration parameter— often to 48 or 72 hours.

SMS messages and the PDU format

GSM recognizes only gm encodings for text messages and 1 encoding for binary messages:. These octets represent the message gxm. In the first case, the representation of time is as follows:.

The octet is used according to a coding group which is indicated in bits The length of the phone number is odd 11therefore a trailing F has been added, as if the phone number were “F”. Sender number decimal semi-octetswith a trailing F. TP-PID Protocol identifier either refers to the higher layer protocol being used, indicates interworking with a certain type of telematic device like faxtelexpagerteletexe-mailspecifies replace type of the message or allows download of configuration parameters to the SIM card.

The following 3 octets contain a relative validity period specigication hours, minutes and seconds as the 3rd to 5th octet of time format. Messages sent via this encoding can be encoded in the default GSM 7- bit alphabet, the 8-bit data alphabet, ems the bit UCS-2 alphabet. The value of 1 in the bit 6 of the first octet means that the message is Single-shot.