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Diffstat (limited to 'doc/manuals/abis/rsl.adoc')
| -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 |