| Neels Hofmeyr | 1971b67 | 2020-01-23 04:40:51 +0100 | [diff] [blame^] | 1 | msc { |
| 2 | hscale="2"; |
| 3 | ms[label="MS,BSS"],__msc[label="MSC"],hlr[label="HLR proxy"],home[label="Home HLR"]; |
| 4 | |
| 5 | ms => __msc [label="Location Updating Request (Periodic)"]; |
| 6 | ms rbox __msc [label="Authentication,\nusing the next of 5 auth tuples the MSC has stored"]; |
| 7 | __msc => hlr [label="Update Location Request"]; |
| 8 | hlr rbox hlr [label="Use already set up proxy path"]; |
| 9 | hlr abox hlr [label="(8) proxy cache already has all information to answer"]; |
| 10 | __msc <= hlr [label="Insert Subscriber Data Request"]; |
| 11 | __msc => hlr [label="Insert Subscriber Data Result"]; |
| 12 | __msc <= hlr [label="Update Location Result"]; |
| 13 | ms <= __msc [label="Location Updating Accept"]; |
| 14 | hlr rbox hlr [label="(9) Verify Update Location with home HLR"]; |
| 15 | |||; |
| 16 | --- [label="if the home HLR has no changes and accepts"]; |
| 17 | hlr => home [label="Update Location Request"]; |
| 18 | hlr <= home [label="Insert Subscriber Data Request"]; |
| 19 | hlr => home [label="Insert Subscriber Data Result"]; |
| 20 | hlr abox hlr [label="Notice identical MSISDN"]; |
| 21 | hlr <= home [label="Update Location Result"]; |
| 22 | |||; |
| 23 | --- [label="if the home HLR is unreachable"]; |
| 24 | hlr => home [label="Update Location Request"]; |
| 25 | hlr abox hlr [label="no link\nor\nresponse timeout"]; |
| 26 | hlr rbox hlr [label="Don't care, carry on"]; |
| 27 | |||; |
| 28 | --- [label="if the home HLR has a modified MSISDN, and accepts"]; |
| 29 | hlr => home [label="Update Location Request"]; |
| 30 | hlr <= home [label="Insert Subscriber Data Request"]; |
| 31 | hlr => home [label="Insert Subscriber Data Result"]; |
| 32 | hlr abox hlr [label="Notice changed MSISDN"]; |
| 33 | __msc <= hlr [label="Insert Subscriber Data Request"]; |
| 34 | __msc => hlr [label="Insert Subscriber Data Result"]; |
| 35 | hlr <= home [label="Update Location Result"]; |
| 36 | |||; |
| 37 | --- [label="if the home HLR rejects"]; |
| 38 | hlr => home [label="Update Location Request"]; |
| 39 | hlr <= home [label="Update Location Error"]; |
| 40 | __msc <= hlr [label="Cancel Location Request"]; |
| 41 | __msc => hlr [label="Cancel Location Result"]; |
| 42 | hlr rbox hlr [label="Clear subscriber cache"]; |
| 43 | } |