Call Control
• Sends HANDOVER_DETECTION to BSC /GSM:08.58:8.4.7/
including the measured access delay value
• Sends a PHYSICAL_INFORMATION message to the MS /
GSM:04.08:3.4.4.2.2/. The PHYSICAL_INFORMATION is sent
in unacknowledged mode to the MS.
If no correct frame is received from the MS, transmission of
PHYSICAL_INFORMATION shall be repeated.
38.3.4 RF Channel Release
By means of the RF CHANNEL_RELEASE procedure /
GSM:08.58:4.7/, the BSC commands the RBS to stop all traffic and
signalling on a group of dedicated logical channels, and to release all
associated resources.
Channel combinations and numbers supported are defined in section
Channel Activation above.
After having released the channel, or if the channel is already released,
the RBS sends an RF_CHANNEL_RELEASE_ACKNOWLEDGE
message /GSM:08.58:8.4.19./ to BSC.
38.3.5 Deactivate SACCH
By means of the DEACTIVATE_SACCH procedure /GSM:08.58:4.6/,
the BSC commands the RBS to immediately stop transmission on
SACCH of the addressed channel group.
Channel combinations and numbers supported are defined in section
Channel Activation above.
38.3.6 Link Establish Indication
By means of the LINK ESTABLISHMENT INDICATION procedure /
GSM:08.58:3.1/, an indication is sent to the BSC that a layer 2 link on
the radio path has been established in multiframe mode.
Channel combinations supported are defined in section Channel
Activation above.
The link establishment procedure is in accordance with /GSM:08.58:3.1/
and /GSM:04.06:5.4.1/.
This function is applicable for:
• SAPI-0 (Service Access Point Identifier) on SDCCH and FACCH
• SAPI-3 on SDCCH and SACCH/T
There are two cases of establishment as described in /GSM:04.06:5.4.1/:
• Normal establishment
• Contention resolution establishment
The Normal Establishment is utilised for SAPI-0 links (in conjunction
with a normal assign or handover) as well as for SAPI-3 links (at SMS
point-to-point).
The Contention Resolution Establishment is utilised for SAPI-0 links
only (in conjunction with an immediate assign).
248 (306)
EN/LZT 123 2697 R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
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