Neels Hofmeyr | b3c1726 | 2020-01-23 04:44:05 +0100 | [diff] [blame^] | 1 | {hscale=2} |
| 2 | ms = MS,BSS |
| 3 | msc = MSC |
| 4 | hlr = HLR proxy |
| 5 | home = Home HLR |
| 6 | |
| 7 | ms -> msc Location Updating Request (Periodic) |
| 8 | ms () msc Authentication, |
| 9 | using the next of 5 auth tuples the MSC has stored |
| 10 | msc -> hlr Update Location Request |
| 11 | hlr () . Use already set up proxy path |
| 12 | hlr <> . (8) proxy cache already has all information to answer |
| 13 | msc <- hlr Insert Subscriber Data Request |
| 14 | msc -> hlr Insert Subscriber Data Result |
| 15 | msc <- hlr Update Location Result |
| 16 | ms <- msc Location Updating Accept |
| 17 | hlr () . (9) Verify Update Location with home HLR |
| 18 | ||| |
| 19 | --- if the home HLR has no changes and accepts |
| 20 | hlr -> home Update Location Request |
| 21 | hlr <- home Insert Subscriber Data Request |
| 22 | hlr -> home Insert Subscriber Data Result |
| 23 | hlr <> . Notice identical MSISDN |
| 24 | hlr <- home Update Location Result |
| 25 | ||| |
| 26 | --- if the home HLR is unreachable |
| 27 | hlr -> home Update Location Request |
| 28 | hlr <> . no link |
| 29 | or |
| 30 | response timeout |
| 31 | hlr () . Don't care, carry on |
| 32 | ||| |
| 33 | --- if the home HLR has a modified MSISDN, and accepts |
| 34 | hlr -> home Update Location Request |
| 35 | hlr <- home Insert Subscriber Data Request |
| 36 | hlr -> home Insert Subscriber Data Result |
| 37 | hlr <> . Notice changed MSISDN |
| 38 | msc <- hlr Insert Subscriber Data Request |
| 39 | msc -> hlr Insert Subscriber Data Result |
| 40 | hlr <- home Update Location Result |
| 41 | ||| |
| 42 | --- if the home HLR rejects |
| 43 | hlr -> home Update Location Request |
| 44 | hlr <- home Update Location Error |
| 45 | msc <- hlr Cancel Location Request |
| 46 | msc -> hlr Cancel Location Result |
| 47 | hlr () . Clear subscriber cache |