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7. DATA - HSCSD
125
LZT 123 7361 R1B
7.3 AT+CHSN HSCSD Non Transparent Call Configuration
Controls parameters for non-transparent HSCSD calls. Changing
<topRx> or <codings> during a call does not affect the current call.
Changing <wAiur> or <wRx> affects the current call only if <topRx>
was non-zero when the call was established. When using the command
in this way it comes in the “action” command category. This is what is
referred to as user initiated up- and down-grading in GSM 02.34 and
GSM 03.34.
Note! Recommended value for parameter <speed> in AT+CBST is 0.
Description Command Possible Responses
Set HSCSD configuration.
This command is also used
during a call if new
<wAiur> and/or <wRx>
are/is desired
AT+CHSN=[<wAiur>
[,<wRx>[,<topRx>
[,<codings>]]]]
• +CME ERROR: <err>
•OK
• ERROR
Show current non-
transparent HSCSD setting
AT+CHSN? • +CHSN: <wAiur>, <wRx>,
<topRx>, <codings>
• +CME ERROR: <err>
•OK
• ERROR
Test if command is
supported and show
parameter ranges
AT+CHSN=? • +CHSN: (list of supported
<wAiur>s), (list of
supported <wRx>s), (list of
supported <topRx>s), (list
of supported <codings>s)
• +CME ERROR: <err>
•OK
• ERROR
<wAiur> Description
0 TA/ME shall calculate a proper number of receive timeslots from
currently selected fixed network user rate (<speed> parameter from
+CBST command, and <codings>, and <wRx> (or <maxRx> from
+CHSD command if <wRx>=0)
1 Wanted air interface user rate is 9.6kbit/s
2 Wanted air interface user rate is 14.4kbit/s
3 Wanted air interface user rate is 19.2kbit/s
4 Wanted air interface user rate is 28.8kbit/s
<wRx> Description
0 TA/ME shall calculate a proper number of receive timeslots from
currently selected <wAiur> and <codings> See note below
1 Wanted number of receive timeslots is 1
2 Wanted number of receive timeslots is 2