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author | Philipp Maier <pmaier@sysmocom.de> | 2020-11-16 17:44:26 +0100 |
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committer | Philipp Maier <pmaier@sysmocom.de> | 2020-11-27 16:02:45 +0100 |
commit | ff96c5d16cb25190e50c0c06ad14b9b2bdf1741a (patch) | |
tree | 191c3ca877a695fd01416acfa3f12b7977fad7b5 | |
parent | 33dfe2bcec8f18f31239fa4c6c48c92f3e42cbe9 (diff) |
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
-rw-r--r-- | doc/manuals/abis/rsl.adoc | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/doc/manuals/abis/rsl.adoc b/doc/manuals/abis/rsl.adoc index 8843a74e..35fda31c 100644 --- a/doc/manuals/abis/rsl.adoc +++ b/doc/manuals/abis/rsl.adoc @@ -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 |