NOT FOR MERGE proxy cache design doc ladders
Change-Id: Ie0093bdb7ddf268d1a5fdf09b201cbd3a347225f
diff --git a/doc/manuals/chapters/proxy_cache_periodic_lu.ladder b/doc/manuals/chapters/proxy_cache_periodic_lu.ladder
new file mode 100644
index 0000000..7ccfcfc
--- /dev/null
+++ b/doc/manuals/chapters/proxy_cache_periodic_lu.ladder
@@ -0,0 +1,47 @@
+{hscale=2}
+ms = MS,BSS
+msc = MSC
+hlr = HLR proxy
+home = Home HLR
+
+ms -> msc Location Updating Request (Periodic)
+ms () msc Authentication,
+ using the next of 5 auth tuples the MSC has stored
+msc -> hlr Update Location Request
+hlr () . Use already set up proxy path
+hlr <> . (8) proxy cache already has all information to answer
+msc <- hlr Insert Subscriber Data Request
+msc -> hlr Insert Subscriber Data Result
+msc <- hlr Update Location Result
+ms <- msc Location Updating Accept
+hlr () . (9) Verify Update Location with home HLR
+|||
+--- if the home HLR has no changes and accepts
+hlr -> home Update Location Request
+hlr <- home Insert Subscriber Data Request
+hlr -> home Insert Subscriber Data Result
+hlr <> . Notice identical MSISDN
+hlr <- home Update Location Result
+|||
+--- if the home HLR is unreachable
+hlr -> home Update Location Request
+hlr <> . no link
+ or
+ response timeout
+hlr () . Don't care, carry on
+|||
+--- if the home HLR has a modified MSISDN, and accepts
+hlr -> home Update Location Request
+hlr <- home Insert Subscriber Data Request
+hlr -> home Insert Subscriber Data Result
+hlr <> . Notice changed MSISDN
+msc <- hlr Insert Subscriber Data Request
+msc -> hlr Insert Subscriber Data Result
+hlr <- home Update Location Result
+|||
+--- if the home HLR rejects
+hlr -> home Update Location Request
+hlr <- home Update Location Error
+msc <- hlr Cancel Location Request
+msc -> hlr Cancel Location Result
+hlr () . Clear subscriber cache