Change in osmo-bsc[master]: doc/location_services_ta.ladder

[neels]

neels has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-bsc/+/20380 )


Change subject: doc/location_services_ta.ladder
......................................................................

doc/location_services_ta.ladder

Change-Id: I49186c6bb076dad9894b100be711e10f2c49e609
---
A doc/location_services_ta.ladder
1 file changed, 72 insertions(+), 0 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/80/20380/1

diff --git a/doc/location_services_ta.ladder b/doc/location_services_ta.ladder
new file mode 100644
index 0000000..c536ef1
--- /dev/null
+++ b/doc/location_services_ta.ladder
@@ -0,0 +1,72 @@
+{hscale=2}
+
+ms = MS/BTS
+bsc = BSC
+smlc = SMLC
+msc = MSC
+
+|||		Location Services (LCS): Perform Location Request using TA
+
+|||
+---		MS in DEDICATED MODE (currently active)
+
+ms > bsc	earlier Measurement Report provides Timing Advance
+
+bsc < msc	PERFORM LOCATION REQUEST
+		3GPP TS 48.008 3.2.1.71
+
+bsc > smlc	BSSMAP-LE PERFORM LOCATION REQUEST
+		3GPP TS 49.031 9.1
+		with BSSLAP APDU = TA Layer3
+		3GPP TS 48.071 4.2.8
+
+smlc () .	SMLC uses TA included in TA Layer3
+
+bsc < smlc	BSSMAP-LE PERFORM LOCATION RESPONSE
+		3GPP TS 49.031 9.2
+
+bsc > msc	PERFORM LOCATION RESPONSE
+		3GPP TS 48.008 3.2.1.72
+
+...
+...
+---		MS in IDLE MODE (not connected)
+
+bsc < msc	PERFORM LOCATION REQUEST
+		3GPP TS 48.008 3.2.1.71
+
+bsc > smlc	BSSMAP-LE PERFORM LOCATION REQUEST
+		3GPP TS 49.031 9.1
+
+smlc () .	SMLC needs TA information,
+		asks BSC via BSSLAP
+
+bsc < smlc	BSSMAP-LE CONNECTION ORIENTED INFORMATION
+		3GPP TS 49.031 9.12
+		with BSSLAP APDU = TA Request
+		3GPP TS 48.071 4.2.1
+
+
+ms < bsc	RR Paging Request
+		3GPP TS 48.018 9.1.22-24
+
+ms > bsc	RSL CHANNEL REQUIRED
+		3GPP TS 48.058 8.5.3
+		includes Access Delay (9.3.17) == Timing Advance
+
+ms > bsc	RR Paging Response
+		3GPP TS 48.018 9.1.25
+
+ms < bsc	RF CHANNEL RELEASE
+		3GPP TS 48.058 8.4.14
+
+bsc > smlc	BSSMAP-LE CONNECTION ORIENTED INFORMATION
+		3GPP TS 49.031 9.12
+		with BSSLAP APDU = TA Response
+		3GPP TS 48.071 4.2.2
+
+bsc < smlc	BSSMAP-LE PERFORM LOCATION RESPONSE
+		3GPP TS 49.031 9.2
+
+bsc > msc	PERFORM LOCATION RESPONSE
+		3GPP TS 48.008 3.2.1.72

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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: I49186c6bb076dad9894b100be711e10f2c49e609
Gerrit-Change-Number: 20380
Gerrit-PatchSet: 1
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-MessageType: newchange
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