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rtp-amr.adoc: TCH/AFS Uplink 

Add new chapter by Nutaq for Speech Frame Following a SID_FIRST frame

Change-Id: Ib7cfb07525ea311d9dac051a6e139b0ae0549504
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Harald Welte 2016-11-03 14:05:15 +01:00 committed by Max
parent b21df2df9b
commit 0b0205e6f4
1 changed files with 119 additions and 12 deletions
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OsmoBTS/abis/rtp-amr.adoc
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@ -167,28 +167,135 @@ msc {
...;
--- [label="Once voice is active again"];
ms -x phy [label="Suppressed L1 burst"];
ms -x phy [label="Suppressed L1 burst"];
ms -x phy [label="Suppressed L1 burst"];
ms -x phy [label="Suppressed 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"];
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 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)