84 lines
3.0 KiB
Plaintext
84 lines
3.0 KiB
Plaintext
== CBSP Procedures
|
|
|
|
=== List of Procedures
|
|
|
|
The following tables list the CBSP procedures used by the OsmoBSC BSC-CBC interface,
|
|
grouped by their level of compliance with 3GPP TS 48.049.
|
|
|
|
==== Procedures Compliant With TS 48.049
|
|
|
|
Specific additions and limitations apply, see the linked sections.
|
|
|
|
.Procedures compliant with TS 48.049
|
|
[options="header",cols="10%,20%,40%,30%"]
|
|
|===
|
|
| TS 48.049 § | This document § | Procedure | Originated/Terminated by OsmoBSC
|
|
| 7.2 | <<PROC_WRITE_REPLACE>> | Write-Replace | Terminated
|
|
| 7.3 | - | Kill | Terminated
|
|
| 7.5 | - | Message Status Query | Terminated
|
|
| 7.7a | <<PROC_KEEP_ALIVE>> | Keep Alive | Terminated
|
|
| 7.8 | <<RESTART_IND>> | Restart Indication | Originated
|
|
|===
|
|
|
|
|
|
[[PROC_WRITE_REPLACE]]
|
|
===== Write-Replace
|
|
|
|
Procedures for _Write_ and _Replace_ of CBS messages as per 3GPP TS 48.049 Section 7.2.2.2
|
|
are fully supported.
|
|
|
|
Procedures for _Write_ and _Replace_ of ETWS messages as per 3GPP TS
|
|
48.059 Section 7.2.2.2 are fully supported. Transmission of the ETWS
|
|
Primary Notification is implemented as follows, assuming related support
|
|
is present in the related BTS and PCU software (true for OsmoBTS >= 1.2.0
|
|
and OsmoPCU >= 0.8.0):
|
|
|
|
* broadcast to MS in idle mode / packet idle mode by sending a
|
|
vendor-specific A-bis RSL message to each affected BTS. A
|
|
vendor-specific mechanism is needed as 3GPP TS 48.058 does not specify
|
|
any standard message for this. See the section on _Osmocom ETWS
|
|
Command_ in <<osmobts-abis-spec>> for more details.
|
|
* broadcast to MS in dedicated mode by sending the ETWS PN via every
|
|
currently active dedicated channel (SDCCH, FACCH) within the affected
|
|
BTSs.
|
|
|
|
As an additional clarification to 3GPP TS 48.049, OsmoBSC rejects (via
|
|
WRITE-REPLACE FAILURE) any _write_ procedure for an emergency message if
|
|
there already is another emergency message active in a cell. The
|
|
_replace_ procedure must be used (by specifying the _Old Serial Number
|
|
IE_) if the only existing emergency message of a cell shall be replaced.
|
|
|
|
[[PROC_KEEP_ALIVE]]
|
|
===== Keep-Alive
|
|
|
|
The Keep-Alive procedure is implemented only in as far as incoming
|
|
Keep-Alive requests are responded to.
|
|
|
|
The BSC currently does not use the _Keep Alive Repetition Period IE_.
|
|
This is permitted as 3GPP TS 48.049 states the information _may_ be used
|
|
by the BSC.
|
|
|
|
[[PROC_RESTART_IND]]
|
|
===== Restart Indication
|
|
|
|
Restart indications are currently only sent whenever any BSC-CBC link is
|
|
established. They are not sent once subsequent cells become available
|
|
or are re-initialized due to A-bis link failure.
|
|
|
|
However, CBSP state for both CBS and Emergency messages is kept
|
|
persistent in the BSC and if cells reboot / restart during the duration
|
|
of a CBS / emergency message, they will resume broadcasts as expected.
|
|
|
|
|
|
==== Procedures Not Implemented by OsmoBSC
|
|
|
|
.3GPP TS 48.049 procedures not implemented by OsmoBSC
|
|
[options="header",cols="30%,40%,30%"]
|
|
|===
|
|
| TS 48.049 § | Procedure | Originated/Terminated by OsmoBSC
|
|
| 7.4 | Load Status Enquiry | Terminated
|
|
| 7.6 | Set DRX | Terminated
|
|
| 7.9 | Failure Indication | Originated
|
|
| 7.10 | Error Indication | Originated
|
|
|===
|