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Neels Hofmeyr gerrit-no-reply at lists.osmocom.orgReview at https://gerrit.osmocom.org/1087 OsmoBTS/abis/rsl: add missing info for Osmocom Dyn Channels The section 'Osmocom Style Dynamic Channels' ended in mid-sentence without naming any of the hard facts. Complete that. Add section links. Change-Id: Ib92895fe1bb89fb1b14dc8fcbd88b98bbb6edeee --- M OsmoBTS/abis/rsl.adoc 1 file changed, 29 insertions(+), 6 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-gsm-manuals refs/changes/87/1087/1 diff --git a/OsmoBTS/abis/rsl.adoc b/OsmoBTS/abis/rsl.adoc index 30a7d77..c9bb555 100644 --- a/OsmoBTS/abis/rsl.adoc +++ b/OsmoBTS/abis/rsl.adoc @@ -125,8 +125,10 @@ RSL channel activation procedures can not only be used for activation of circuit-switched channels, but also for activation of a PDCH. -NOTE:: Do not confuse this with the ip.access style _PDCH ACT_ type -dynamic PDCH protocol employed by nanoBTS devices. +See <<OSMOCOM_DYN_TS>>. + +NOTE:: Do not confuse this with the IPA style _PDCH ACT_ type +dynamic PDCH protocol employed by nanoBTS devices (<<ipa_style_pdch_mgmt>>). [[MEASUREMENT_RESULT]] ==== Measurement Result @@ -894,14 +896,35 @@ include::dyn_ts_ipa_style.msc[] ---- -==== Osmocom style Dynamic Channels +[[OSMOCOM_DYN_TS]] +==== Osmocom Style Dynamic Channels This method is in use when OML uses 'NM_CHANC_OSMO_TCHFull_TCHHalf_PDCH' (0x90) for the given time-slot. -The activation of PDCH is performed by using the regular 'RSL CHANNEL -ACTIVATE' procedure according to <<CHANNEL_ACTIVATION>>, with the -exception that the 'cbits' part of the ' +The activation of PDCH is performed by using the regular 'RSL CHANNEL ACTIVATE' +procedure according to <<CHANNEL_ACTIVATION>>, with these modifications: + +* The 'C-bits' part of the 'Channel Number' IE take the non-standard binary + value 11000 (C5 thru C1 as seen in 3GPP TS 08.58 § 9.3.1). +* The 'A-bits' part of the 'Activation Type' IE take the non-standard binary + value 1111, with an additional fourth bit (add A4 to A3 thru A1 as seen in + 3GPP TS 08.58 § 9.3.3; all remaining reserved bits as well as the 'R' bit are + coded as zero). +* The normally mandatory 'Channel Mode' IE is omitted; none of the optional IEs + are included. + +Hence the message consists of exactly these IEs: + +.PDCH type _Channel Activation_ message IEs +[options="header",cols="10%,30%,60%"] +|=== +| TS 08.58 § | IE Name | Handling +| 9.1 | Message discriminator | Dedicated Channel Management +| 9.2 | Message type | CHANnel ACTIVation +| 9.3.1 | Channel number | 'C-bits' 11000, plus TS bits as usual +| 9.3.3 | Activation type | 'A-bits' 1111 +|=== .Example for dynamic channel switchover, for Osmocom style dynamic timeslots ["mscgen"] -- To view, visit https://gerrit.osmocom.org/1087 To unsubscribe, visit https://gerrit.osmocom.org/settings Gerrit-MessageType: newchange Gerrit-Change-Id: Ib92895fe1bb89fb1b14dc8fcbd88b98bbb6edeee Gerrit-PatchSet: 1 Gerrit-Project: osmo-gsm-manuals Gerrit-Branch: master Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>