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rsl.adoc: update documentation for RSL_IE_OSMO_REP_ACCH_CAP 

The recently added IE (RSL_IE_OSMO_REP_ACCH_CAP) has been extended
with more options, update the documentation as well.

Change-Id: I3d95da588e863185bb62e92898c285d52bce9af4
Related: SYS#5114, OS#4796, OS#4794, OS#4795
This commit is contained in:
Philipp Maier 2020-11-16 17:44:26 +01:00
parent 33dfe2bcec
commit ff96c5d16c
1 changed files with 20 additions and 4 deletions
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24
doc/manuals/abis/rsl.adoc
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@ -958,10 +958,26 @@ transmissions of the RTP flow.
==== RSL_IE_OSMO_REP_ACCH_CAP
This is a one byte length TLV IE that is used to enable or disable repeated ACCH
capabilities on the BTS side during Channel Activation and Mode Modify. If the
IE is present and its value byte is set to 0x01, then the BTS will enable
repeated ACCH capabilities, otherwise the channel is activated without repeated
ACCH capabilities present.
capabilities on the BTS side during Channel Activation and Mode Modify.
The IE contains a bitfield in the lower nibble in order to set the ACCH repetition
policy for each of the two channel types individually. Depending on the state of the
bits (see table below) the ACCH repetition mode is either enabled or disabled completely.
The lower 3 bit of the higher nibble are used to signal an RXQUAL threshold to set the
BER on which UL-SACCH or DL-FACCH repetition shall be turned on. If the field is set
to 0, then UL-SACCH and DL-FACCH will be always on. DL-FACCH will also be turned on
automatically as soon as the MS requests a DL-SACCH repetition.
If the IE is not present, then ACCH repetition completely is disabled.
[options="header"]
|===
| *bit* | 7 | 6 - 4 | 3 | 2 | 1 | 0
| byte at offset 0 | 0 | RXQUAL | UL-SACCH | DL-SACCH | DL-FACCH/ALL | DL-FACCH/CMD
|===
(Bits 7 is reserved for future use and must be set to zero.)
=== A-bis RSL Initialization / BTS bring-up