Table of Contents
Advertisement
In this document we are only going to consider SMS-SUBMIT and SMS-
DELIVER PDU's.
4.2.2 Reject Duplicates (TP-RD)
This 1-bit flag located in Bit 2 of the octet in question. This field indicates
whether or not the Service Centre shall accept an "identical" SMS from the
same originating Mobile when the original SMS is still held at the Service
Centre. The comparison is made using the TP-MR, and TP-DA fields only.
These fields are explained later. Usually this parameter can be left as 0,
which means that duplicates should be accepted by the Service Centre.
4.2.3 Validity Period Format (TP-VPF)
This is 2-bit field, and describes the format used for a parameter that
comes later in the PDU, namely the validity period (TP-VP). The validity
period basically informs the Service Centre how long it should hold a SMS
when the destination is unreachable, before discarding the SMS.
There are 4 different choices for the validity period, which can be chosen
according to the following table:
BIT 4
0
1
0
1
As will be seen it is usually enough to use the relative format, and it will
also be the only format in which we go into any detail in this document.
4.2.4 Status Report Request (TP-SRR)
This is another 1-bit flag found in bit number 5 of the octet in question,
which basically requests another type of SMS to be returned to the Mobile
after the SMS-SUBMIT is sent to the Service Centre. There exists an SMS
of type SMS-STATUS REPORT where the status of previously sent
SMS's can be reported. Not all mobile stations, or for that matter, all
networks support this type of SMS.
Simply put, if it's a 1, a status report is requested, and 0 otherwise.
Normally this parameter can be set to 0.
LZT 123 7632 R1A
Construction of SMS PDU's
BIT 3
0
No Validity Period field will be present.
Relative format used for the Validity Period.
0
1
Enhanced format used for the Validity Period.
Absolute format used for the Validity period.
1
MEANING
12
Hide quick links:
Advertisement
Table of Contents
