manual: describe TA-based positioning and cell locations
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== Configure Cell Locations
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To determine geographic location estimates based on the serving cell, OsmoSMLC
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needs preconfigured global positions by latitude and longitude, for each cell of
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each BSC.
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On the `cells` configuration node, cell locations can be indicated by LAC and
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CI, or by Cell Global Identity. The following example configures the position
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for a cell by LAC 23 and CI 42:
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----
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cells
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lac-ci 23 42 lat 12.3456 lon 23.4567
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----
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The following example configures the position by a Cell Global Identity with
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PLMN 001-01, LAC 2 and CI 3:
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----
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cells
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cgi 001 01 2 3 lat 34.5678 lon 45.6789
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----
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If a cell's latitude and longitude is not configured, all location requests for
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subscribers served by that cell are answered by a BSSMAP-LE Perform Location
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Response without a Location Estimate and LCS Cause "Facility not supported".
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@ -0,0 +1,11 @@
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== Positioning Methods
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So far, OsmoSMLC provides only TA-based positioning.
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=== TA-Based Positioning
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In TA-based positioning, the serving Cell Id and the Timing Advance (a.k.a.
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Access Delay) are provided by the BSC. OsmoSMLC returns a GAD "ellipsoid point
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with uncertainty circle" as location estimate. The ellipsoid point is the
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latitude and longitude of the serving cell, and the uncertainty circle is the
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maximum distance from that cell based on the Timing Advance information.
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@ -63,10 +63,11 @@ has to configure a distinct point-code. See <<cs7_config>>.
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===== Configure SCCP/M3UA (AoIP)
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===== Configure SCCP/M3UA (AoIP)
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OsmoSMLC acts as client to contact an STP instance and establish an SCCP/M3UA
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OsmoSMLC acts as client to contact an STP instance and establish an SCCP/M3UA
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link.
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link. OsmoSMLC always uses the SSN "SMLC (BSSMAP-LE)" (SSN code 252). The
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configurable point-code defaults to 0.23.6 (190).
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An example configuration of OsmoSMLC's Lb SCCP link, assuming the SMLC at
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An example configuration of OsmoSMLC's Lb SCCP link, assuming the SMLC at
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point-code 1.23.6 via an SG listening for M3UA at 127.0.0.1:2905:
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point-code 1.23.6, listening for M3UA at 127.0.0.1:2905:
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----
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----
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cs7 instance 0
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cs7 instance 0
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@ -18,6 +18,10 @@ include::./common/chapters/logging.adoc[]
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include::./common/chapters/cs7-config.adoc[]
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include::./common/chapters/cs7-config.adoc[]
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include::{srcdir}/chapters/positioning.adoc[]
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include::{srcdir}/chapters/cells.adoc[]
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include::./common/chapters/counters-overview.adoc[]
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include::./common/chapters/counters-overview.adoc[]
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// include::{srcdir}/chapters/counters.adoc[]
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// include::{srcdir}/chapters/counters.adoc[]
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