Ericsson Radio Systems AB PKRC1311004-1 Manual De Usuario

Mode Modify

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.

27.1

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.

27.2

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

R1A

2001-06-26

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