Reference Manual

Mode Modify
33 Mode Modify
The "Mode Modify" procedure is used by BSC to request a change of
the channel mode (speech to data, data to speech, and so forth) of an
active channel.
33.1 References
/GSM 05.02/ GSM 05.02 (phase2) version 4.3.0
/GSM 08.58/ GSM 08.58 (phase2) version 4.2.0
Whenever a reference is made to a function described in another chapter,
please refer to the table of contents to find the appropriate chapter.
33.2 Function
By means of the MODE MODIFY procedure /GSM: 08.58:4.2./ BSC
orders RBS to change channel mode of an active dedicated channel
group.
Supported channel combinations /GSM:05.02:6.4/:
• (i) TCH/F + FACCH/F + SACCH/TF
•
(ii) TCH/H(0.1) + FACCH/H(0.1) + SACCH/TH(0.1)
• (viii) TCH/F + FACCH/F + SACCH/M
• (ix) TCH/F + SACCH/M
•
(x) TCH/FD + SACCH/MD
RBS actions:
• Interpretation of MODE_MODIFY message from BSC
•
Channel Mode Modification
The function is initiated when a MODE_MODIFY message /
GSM:08.58:8.4.9/, is received from BSC. Any transition between the
following full rate channel modes /GSM:08.58:9.3.6/ is supported:
TCH/F Signalling
TCH/FS Full rate speech, GSM speech alg. ver 1
TCH/FS Full rate speech, GSM speech alg. ver 2
TCH/F14.4 NT Full rate data 14.4 kbit/s non-transparent
TCH/F9.6 NT Full rate data 9.6 kbit/s non-transparent
TCH/F9.6 Full rate data 9.6 kbit/s transparent
TCH/F4.8 Full rate data 4.8 kbit/s transparent
TCH/F2.4 Full rate data 2.4 kbit/s transparent
TCH/F2.4 Full rate data 1.2 kbit/s transparent
TCH/F2.4 Full rate data 1200/75 bit/s transparent
EN/LZT 720 0008 P2A
2001-11-28
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