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In the event that an MS receives a code where a symbol is not represented in Figure 1.2,
table of GSM 03.38 alphabet
(see Figure 1.1,
Main character table of GSM 03.38
1.5.2
UCS2 and GSM data coding and conversion for SMS text mode
This section provides basic information on how to handle input and output character conversion for SMS text
mode and Remote-SAT if internal (TA) and external (TE) character representation differ, i.e. if the Data Coding
Scheme and the TE character use different coding.
1.5.2.1
Implementing output of SIM data to Terminal (direction TA to
TE)
Used character set
GSM
UCS2
Note: The ratio of SIM bytes to output bytes is given in parentheses.
Case 1
Every GSM character is sent to the TE as it is (8-bit value with highest bit set to zero).
Example: 47'H, 53'H, 4D'H → 47'H, 53'H, 4D'H, displayed as "GSM"
Case 2
Every data byte is sent to the TE as 2 IRA characters each representing a halfbyte.
Example: B8'H (184 decimal) → 42'H, 38'H, displayed as "B8"
Case 3
Every 16-bit UCS2 value is sent to the TE as 4 IRA characters.
Example: C4xA7'H (50343 decimal) → 43'H, 34'H, 41'H, 37'H, displayed as "C4A7"
Problem: An odd number of bytes leads to an error because there are always two bytes needed for each USC2
character
Case 4
Every GSM character is sent to the TE as 4 IRA characters to show UCS2 in text mode.
Example: 41'H ("A") → 30'H, 30'H, 34'H, 31'H, displayed as "0041"
Case 5
Every data byte is sent to the TE as IRA representation of UCS2 (similar to case 4).
Example: B2'H → 30'H, 30'H, 42'H, 32'H, displayed as "00B2"
Case 6
Every 16-bit value is sent to the TE as IRA representation of it. It is assumed that number of bytes is even.
Example: C3x46'H → 43'H, 33'H, 34'H, 36'H, displayed as "C346"
MC55_ATC_V04.00
Confidential / Released
the MS shall display the character shown in the main default 7 bit alphabet table
alphabet).
DCS = 7 bit
GSM
Case 1
GSM (1:1)
Case 4
GSM to IRA (1:4)
Page 23 of 475
DCS = 8 bit
Data
Case 2
8 bit to IRA (1:2)
Case 5
8 bit to IRA (1:4)
Extension character
DCS = 16 bit
UCS2
Case 3
UCS2 to IRA (2:4)
Case 6
UCS2 to IRA (2:4)
3/17/06
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