GSM or 3GPP TS is a mobile telephony standard describing the format of the Transfer Protocol Data Units (TPDU) of the Short Message Transfer . 3gppATechnical Realization of the Short Message Service . of 2T”& re istered for the benefit of its Members and of the 3GPP Or ani!ational Partners. The architecture for SMS is specified in 3GPP TS 3 and for SMS over IP from CSE 10 at Krishna Institute Of Engineering and Technology.
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GSM recognizes only 2 encodings for text messages and 1 encoding for binary messages:. The value of 1 in the bit 6 of the first octet means that the message is Single-shot. Although these changes are ancient version 6. However, the validity period is usually limited globally by the SMSC configuration parameter— often to 48 or 72 hours. These characters form GSM 7-bit default alphabet extension table. The TP-DCS octet has a complex syntax to allow carrying of other information; the most notable are message classes:.
Bit 3 is 1, therefore the time zone is negative. Message Waiting Indication group of DCS values can set or reset flags of indicating presence of unread voicemailfaxe-mail or other messages. If the time zone offset is negative in Western hemisphere bit 3 of the last octet is set to 1.
This format is used throughout the whole transfer of the message in the GSM mobile network. The value of 1 in the bit 7 of 223040 first octet indicates that TP-VP functionality indicator extends to another octet. Its 3 least significant bits have the following meaning:. Longer messages can be split to multiple parts and sent as a Concatenated SMS.
The mobile operator must take special measures to charge such messages. From Wikipedia, the free encyclopedia. The content of the message its text when the message is not a binary one is carried in the TP-UD field. For example, a fictional alphanumeric address Design Home is converted to the GSM 7-bit default alphabet which yields 11 bytes 44 65 73 69 67 6E 00 48 6F 6D 65 hexthe 7-bit packing transforms it to 77 bits stored in 10 octets as C4 F2 3C 7D 76 03 90 EF 76 19; 77 bits is 20 nibbles 14 hex which is the value of the first octet of the address.
The absolute format is identical to the other time formats in GSM 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 delivery of subsequent messages or message segments.
However, the original name is often used to refer even to the 3GPP document. Alphanumeric address is at first put to the GSM 7-bit default alphabet, then encoded the same way as any message text in TP-UD field that means it is 7-bit packed and then the address is supplied with the “number” length and TON and NPI.
Setting the TP-RP bits turns on a feature which allows to send a reply for a message using the same 3gp as the original message. This page was last edited on 1 2304at They are not stored in the phone, they just displayed on the phone display.
www.3gpp.org – /ftp/Specs/archive/23_series/23.040/
Any handset must be able to receive such short message irrespective of whether there is memory available in the U SIM or 3tpp or not, must acknowledge receipt of the message, but must not indicate its receipt to the user and must discard its contents, so the message will not be stored in the U SIM or ME.
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. However, no such extensions are defined. Flash messages are received by a mobile phone even though it has full memory. It has always 7 octets, although some of them are not used.
GSM – Wikipedia
The following 3 octets contain a relative validity period in hours, minutes and seconds as the 3rd to 5th octet of time format. Such message may be sent only if the original message had this flag cleared and the new message must be sent with the flag set.
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 3hpp first character after UDH was Carriage Return CRthe mobile phone would rewrite the mess with the rest of the message.
Other addresses are carried by lower layers. If the originator and 3gppp recipient home networks differ, the reply would go through another SMSC then usually.
Enhanced format of TP-VP field is seldom used.
The same was also true for other languages using non-Latin scripts like Russian, Arabic, Hebrew and various Indian languages.