Download AECS 03-04e

3.7.2.3 If a protocol data packet size is over 140 byte, a concatenation mechanism of SMS
messages is used, it is specified in standard [3], (9.2.3.24.1)]. This mechanism is based on
splitting transmitted user data into parts and delivery in separate SMS messages. Upon that
every message of this type has a special structure, which determines a total number of parts
of transmitted data and their assembly ordering on a receiving side. A TP_UD_HEADER,
which contains an information element, characterizing a part of concatenated SMS
message, is used as such structure. Thus, proceeding from a size of user data header size
and a maximum number of a long message parts, which is 255, a maximum allowable
packet size can comprise 255*(140-6)=34170 byte, if 8-bit coding is used.
3.8 Time and quantitative variables of the transport protocol when using a data batch
sending method
Designation and description of time and quantitative variables of the transport protocol are
specified in Table 13.
Table 13 - Time and quantitative parameters of a transport protocol
Name
Data type
Value range
Default value
TL RESPONSE TO
BYTE
0 ... 255
5
TL RESEND ATTEMPTS
BYTE
0 ... 255
3
TL RECONNECT T O
BYTE
0 ... 255
30
4
Description
Waiting period of packet
confirmation at a transport level,
in seconds
A number of retries of a nonconfirmed packet delivery
A period from link breaking
till another try of
communication channel
reestablishment.
Service support protocol (general part)
4.1 Service support protocol assignment
4.1.1 A service support protocol is intended for data exchange between ERA system
elements, providing for system operation and rendering information services to consumers.
Each service coincides with an individual key element of the system, build up on a service
support protocol base.
4.1.2 A service support protocol performs the following key functions:
- exchange of informative messages, containing data to be processed by different services,
and information release requests;
- assurance of service support data delivery and processing confirmation;
- identification of data belonging to a certain type of service;
- data characteristics determination (a number, a type, a composition, a size, coding, etc.)
4.2 Informative messages exchange
A service support protocol key structure, which contains all necessary data for information
processing or any service request, is recording. Each record can consists of several
subrecords, which comprise the necessary data and determine actions, performed by the
subrecord processing service.
4.3 Assurance of a confirmation on service support data delivery and processing results
In terms of the service support level a sender's notification on data delivery and processing
results is ensured by the informative record confirmation mechanism, which uses special
subrecords where a received/processed record identificator is stored.
4.4 Identification of service support protocol data belonging
101