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Review at https://gerrit.osmocom.org/1186
rtp-amr.adoc: TCH/AFS Uplink
Add new chapter by Nutaq for Speech Frame Following a SID_FIRST frame
Change-Id: Ib7cfb07525ea311d9dac051a6e139b0ae0549504
---
M OsmoBTS/abis/rtp-amr.adoc
1 file changed, 115 insertions(+), 8 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-gsm-manuals refs/changes/86/1186/1
diff --git a/OsmoBTS/abis/rtp-amr.adoc b/OsmoBTS/abis/rtp-amr.adoc
index 6572766..f82b420 100644
--- a/OsmoBTS/abis/rtp-amr.adoc
+++ b/OsmoBTS/abis/rtp-amr.adoc
@@ -171,24 +171,131 @@
ms -x phy [label="Supressed L1 burst"];
ms -x phy [label="Supressed L1 burst"];
ms -x phy [label="Supressed L1 burst"];
- ms => phy [label="L1 burst (sub-block 5 of SID_ONSET + sub-block 1 of speech frame N)", id="ULSO2"];
- ms => phy [label="L1 burst (sub-block 6 of SID_ONSET + sub-block 2 of speech frame N)"];
- ms => phy [label="L1 burst (sub-block 7 of SID_ONSET + sub-block 3 of speech frame N)"];
- ms => phy [label="L1 burst (sub-block 8 of SID_ONSET + sub-block 4 of speech frame N)"];
- phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr_Onset"];
- bts => bts [label="lchan_set_marker() and store CMI"];
+ phy -x bts [label="No PH-DATA.ind sent[BFI]"];
+ bts -x mgw [label="Suppressed RTP frame"];
+
+ ms => phy [label="L1 burst (block 1 of SID_ONSET + sub-block 1 of speech frame N)", id="ULSO2"];
+ ms => phy [label="L1 burst (block 2 of SID_ONSET + sub-block 2 of speech frame N)"];
+ ms => phy [label="L1 burst (block 3 of SID_ONSET + sub-block 3 of speech frame N)"];
+ ms => phy [label="L1 burst (block 4 of SID_ONSET + sub-block 4 of speech frame N)"];
+ phy -x bts [label="No PH-DATA.ind sent[BFI]"];
+ bts -x mgw [label="Suppressed RTP frame"];
+
ms => phy [label="L1 burst (sub-block 5 of speech frame N + sub-block 1 of speech frame N+1)"];
ms => phy [label="L1 burst (sub-block 6 of speech frame N + sub-block 2 of speech frame N+1)"];
ms => phy [label="L1 burst (sub-block 7 of speech frame N + sub-block 3 of speech frame N+1)"];
ms => phy [label="L1 burst (sub-block 8 of speech frame N + sub-block 4 of speech frame N+1)"];
+ phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr_Onset"];
+ bts => bts [label="lchan_set_marker() and store CMI"];
phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr (N)"];
- bts => mgw [label="RTP (AMR FT=0..7,Q=1), MARKER=1"];
+ bts => mgw [label="RTP (AMR FT=0..7,Q=1) MARKER=1"];
+
+ ms => phy [label="L1 burst (sub-block 5 of speech frame N+1 + sub-block 1 of speech frame N+2)"];
+ ms => phy [label="L1 burst (sub-block 6 of speech frame N+1 + sub-block 2 of speech frame N+2)"];
+ ms => phy [label="L1 burst (sub-block 7 of speech frame N+1 + sub-block 3 of speech frame N+2)"];
+ ms => phy [label="L1 burst (sub-block 8 of speech frame N+1 + sub-block 4 of speech frame N+2)"];
+ phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr (N+1)"];
+ bts => mgw [label="RTP (AMR FT=0..7,Q=1)"];
...;
}
----
ULSO2:: sub-blocks 1..4 of SID_ONSET are never transmitted as all
-infomration is contained in blocks 5..8.
+information is contained in blocks 5..8.
+
+==== TCH/AFS Uplink: Speech Frame Following a SID_FIRST frame
+
+The four last bursts of a SID_FIRST frame can be replaced by an ONSET frame in order to quickly resume speech.
+
+["mscgen"]
+----
+msc {
+ hscale = 2;
+ ms [label="MS"], phy [label="BTS-PHY"], bts [label="BTS"], mgw [label="MGW"];
+
+ ...;
+ --- [label="Speech Frame Following a SID_FIRST"];
+
+ ms => phy [label="L1 burst (sub-block 5 of speech frame N, sub-block 1 of SID_FIRST)"];
+ ms => phy [label="L1 burst (sub-block 6 of speech frame N, sub-block 2 of SID_FIRST)"];
+ ms => phy [label="L1 burst (sub-block 7 of speech frame N, sub-block 3 of SID_FIRST)"];
+ ms => phy [label="L1 burst (sub-block 8 of speech frame N, sub-block 4 of SID_FIRST)"];
+ phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr (N)"];
+ bts => mgw [label="RTP (AMR FT=0..7,Q=1)"];
+
+ ms => phy [label="L1 burst (block 1 of SID_ONSET + sub-block 1 of speech frame N+1)"];
+ ms => phy [label="L1 burst (block 2 of SID_ONSET + sub-block 2 of speech frame N+1)"];
+ ms => phy [label="L1 burst (block 3 of SID_ONSET + sub-block 3 of speech frame N+1)"];
+ ms => phy [label="L1 burst (block 4 of SID_ONSET + sub-block 4 of speech frame N+1)"];
+ phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr (SID_FIRST)"];
+ bts => mgw [label="RTP (AMR FT=SID,Q=1)"];
+
+ ms => phy [label="L1 burst (sub-block 5 of speech frame N+1 + sub-block 1 of speech frame N+2)"];
+ ms => phy [label="L1 burst (sub-block 6 of speech frame N+1 + sub-block 2 of speech frame N+2)"];
+ ms => phy [label="L1 burst (sub-block 7 of speech frame N+1 + sub-block 3 of speech frame N+2)"];
+ ms => phy [label="L1 burst (sub-block 8 of speech frame N+1 + sub-block 4 of speech frame N+2)"];
+ phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr_Onset"];
+ bts => bts [label="lchan_set_marker() and store CMI"];
+ phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr (N+1)"];
+ bts => mgw [label="RTP (AMR FT=0..7,Q=1) MARKER=1"];
+ ...;
+}
+----
+
+==== TCH/AFS Uplink: FACCH/F Frame During DTX Operation
+
+As mentioned in section A.5.1.2.1 of 3GPP TS 26.093 :
+
+* If the frame preceding the FACCH frame is not of TX_TYPE='SPEECH_GOOD', then an ONSET frame shall be signalled to the CHE, followed by the FACCH frame(s).
+* If the frame following the FACCH frame is not of TX_TYPE='SPEECH_GOOD', then a SID_FIRST shall be signalled to the CHE.
+
+["mscgen"]
+----
+msc {
+ hscale = 2;
+ ms [label="MS"], phy [label="BTS-PHY"], bts [label="BTS"], mgw [label="MGW"];
+
+ ...;
+ --- [label="FACCH/F Frame During DTX"];
+
+ ms -x phy [label="Supressed L1 burst"];
+ ms -x phy [label="Supressed L1 burst"];
+ ms -x phy [label="Supressed L1 burst"];
+ ms -x phy [label="Supressed L1 burst"];
+ phy -x bts [label="No PH-DATA.ind sent[BFI]"];
+ bts -x mgw [label="Suppressed RTP frame"];
+
+ ms => phy [label="L1 burst (block 1 of SID_ONSET + sub-block 1 of FACCH frame)"];
+ ms => phy [label="L1 burst (block 2 of SID_ONSET + sub-block 2 of FACCH frame)"];
+ ms => phy [label="L1 burst (block 3 of SID_ONSET + sub-block 3 of FACCH frame)"];
+ ms => phy [label="L1 burst (block 4 of SID_ONSET + sub-block 4 of FACCH frame)"];
+ phy -x bts [label="No PH-DATA.ind sent[BFI]"];
+ bts -x mgw [label="Suppressed RTP frame"];
+
+ ms => phy [label="L1 burst (sub-block 5 of FACCH frame + sub-block 1 of SID First frame)"];
+ ms => phy [label="L1 burst (sub-block 6 of FACCH frame + sub-block 2 of SID First frame)"];
+ ms => phy [label="L1 burst (sub-block 7 of FACCH frame + sub-block 3 of SID First frame)"];
+ ms => phy [label="L1 burst (sub-block 8 of FACCH frame + sub-block 4 of SID First frame)", id="Note"];
+ phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr_Onset"];
+ bts => bts [label="lchan_set_marker() and store CMI"];
+ phy => bts [label="PH-DATA.ind FACCH/F"];
+ bts => mgw [label="FACCH/F"];
+
+ ms -x phy [label="Supressed L1 burst", id="ULSF2"];
+ ms -x phy [label="Supressed L1 burst"];
+ ms -x phy [label="Supressed L1 burst"];
+ ms -x phy [label="Supressed L1 burst"];
+ phy => bts [label="PH-DATA.ind GsmL1_TchPlType_Amr (SID_FIRST)"];
+ bts => mgw [label="RTP (AMR FT=SID,Q=1)"];
+ ...;
+}
+----
+
+ULSF2:: The sub-blocks 5-8 of SID_FIRST are not transmitted, as all
+information bits are contained in sub-blocks 1-4 only
+
+Note:: It has been observed with some phones that the SID_FIRST is not sent following the FACCH/F
+frame. If this case occures the No Data Frame and SID_UPDATE order resumes.
=== TCH/AFS Downlink (Network to MS)
--
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ib7cfb07525ea311d9dac051a6e139b0ae0549504
Gerrit-PatchSet: 1
Gerrit-Project: osmo-gsm-manuals
Gerrit-Branch: master
Gerrit-Owner: Max <msuraev at sysmocom.de>