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msc {
hscale="2";
ms[label="MS/BTS"],bsc[label="BSC"],smlc[label="SMLC"],__msc[label="MSC"];
||| [label="Location Services (LCS): Perform Location Request using TA"];
|||;
--- [label="MS in DEDICATED MODE (currently active)"];
ms =>> bsc [label="earlier Measurement Report provides Timing Advance"];
bsc <<= __msc [label="PERFORM LOCATION REQUEST\n3GPP TS 48.008 3.2.1.71"];
bsc =>> smlc [label="BSSMAP-LE PERFORM LOCATION REQUEST\n3GPP TS 49.031 9.1\nwith BSSLAP APDU = TA Layer3\n3GPP TS 48.071 4.2.8"];
smlc rbox smlc [label="SMLC uses TA included in TA Layer3"];
bsc <<= smlc [label="BSSMAP-LE PERFORM LOCATION RESPONSE\n3GPP TS 49.031 9.2"];
bsc =>> __msc [label="PERFORM LOCATION RESPONSE\n3GPP TS 48.008 3.2.1.72"];
...;
...;
--- [label="MS in IDLE MODE (not connected)"];
bsc <<= __msc [label="PERFORM LOCATION REQUEST\n3GPP TS 48.008 3.2.1.71"];
bsc =>> smlc [label="BSSMAP-LE PERFORM LOCATION REQUEST\n3GPP TS 49.031 9.1"];
smlc rbox smlc [label="SMLC needs TA information,\nasks BSC via BSSLAP"];
bsc <<= smlc [label="BSSMAP-LE CONNECTION ORIENTED INFORMATION\n3GPP TS 49.031 9.12\nwith BSSLAP APDU = TA Request\n3GPP TS 48.071 4.2.1"];
ms <<= bsc [label="RR Paging Request\n3GPP TS 48.018 9.1.22-24"];
ms =>> bsc [label="RSL CHANNEL REQUIRED\n3GPP TS 48.058 8.5.3\nincludes Access Delay (9.3.17) == Timing Advance"];
ms =>> bsc [label="RR Paging Response\n3GPP TS 48.018 9.1.25"];
ms <<= bsc [label="RF CHANNEL RELEASE\n3GPP TS 48.058 8.4.14"];
bsc =>> smlc [label="BSSMAP-LE CONNECTION ORIENTED INFORMATION\n3GPP TS 49.031 9.12\nwith BSSLAP APDU = TA Response\n3GPP TS 48.071 4.2.2"];
bsc <<= smlc [label="BSSMAP-LE PERFORM LOCATION RESPONSE\n3GPP TS 49.031 9.2"];
bsc =>> __msc [label="PERFORM LOCATION RESPONSE\n3GPP TS 48.008 3.2.1.72"];
}
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