osmo-hnbgw/doc/charts/hnbgw_context_map.msc

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msc {
hscale="2";
hnb[label="HNB"],rua[label="OsmoHNBGW\nRUA FSM / HNBAP"],sccp[label="OsmoHNBGW\nSCCP FSM"],cn[label="CN"];
hnb <=> rua [label="RANAP/RUA\n(Iuh)"];
rua <=> sccp [label="FSM events"];
sccp <=> cn [label="RANAP/SCCP/M3UA\n(IuCS, IuPS)"];
...;
...;
--- [label="Create a new context map (always from HNB)"];
hnb => rua [label="RUA Connect\nRANAP InitialUE-Message\nDTAP Location Updating Request"];
rua rbox sccp [label="hnbgw_context_map_alloc()"];
rua abox rua [label="MAP_RUA_ST_INIT"];
sccp abox sccp [label="MAP_SCCP_ST_INIT"];
rua rbox rua [label="MAP_RUA_EV_RX_CONNECT\ndata = ranap_msg"];
rua abox rua [label="MAP_RUA_ST_CONNECTED"];
rua => sccp [label="MAP_SCCP_EV_TX_RANAP_MSG\ndata = ranap_msg"];
sccp abox sccp [label="MAP_SCCP_ST_WAIT_CC"];
sccp => cn [label="SCCP Connection Request\nRANAP InitialUE-Message\nDTAP Location Updating Request"];
...;
sccp <= cn [label="SCCP Connection Confirm"];
sccp abox sccp [label="MAP_SCCP_ST_CONNECTED"];
--- [label="if SCCP CC with payload"];
rua <= sccp [label="MAP_RUA_EV_TX_RANAP_MSG\ndata = ranap_msg"];
hnb <= rua [label="RUA DirectTransfer"];
...;
...;
--- [label="Layer 3 communication"];
sccp <= cn [label="SCCP Data Form 1"];
rua <= sccp [label="MAP_RUA_EV_TX_RANAP_MSG\ndata = ranap_msg"];
hnb <= rua [label="RUA DirectTransfer"];
...;
hnb => rua [label="RUA DirectTransfer"];
rua => sccp [label="MAP_SCCP_EV_TX_RANAP_MSG\ndata = ranap_msg"];
sccp => cn [label="SCCP Data Form 1"];
...;
...;
--- [label="Usual release"];
sccp <= cn [label="SCCP Data Form 1\nIu-ReleaseCommand"];
rua <= sccp [label="MAP_RUA_EV_TX_RANAP_MSG\ndata = ranap_msg"];
hnb <= rua [label="RUA DirectTransfer\nIu-ReleaseCommand"];
...;
hnb => rua [label="RUA Disconnect\nIu-ReleaseComplete"];
rua rbox rua [label="MAP_RUA_EV_RX_DISCONNECT"];
rua abox rua [label="MAP_RUA_ST_DISCONNECTED"];
rua => sccp [label="MAP_SCCP_EV_RAN_DISC\ndata = ranap_msg"];
sccp => cn [label="SCCP Data Form 1\nIu-ReleaseComplete\nNOT 'SCCP Released'! See 3GPP TS 48.006 9.2"];
sccp abox sccp [label="MAP_SCCP_ST_WAIT_RLSD"];
...;
sccp <= cn [label="SCCP Released"];
sccp abox sccp [label="MAP_SCCP_ST_DISCONNECTED"];
rua rbox sccp [label="map_check_released()"];
rua rbox sccp [label="hnbgw_context_map_free()"];
...;
...;
--- [label="Ungraceful release from CN"];
sccp <= cn [label="SCCP Released"];
sccp => cn [label="SCCP Release Complete\n(implicit by libosmo-sigtran)"];
sccp rbox sccp [label="MAP_SCCP_EV_RX_RELEASED"];
sccp note sccp [label="In SCCP there is no \"link loss\".\nIn every case, we will be notified\nvia N-Disconnect prim per SCCP conn."];
sccp abox sccp [label="MAP_SCCP_ST_DISCONNECTED"];
rua <= sccp [label="MAP_RUA_EV_CN_DISC"];
hnb <= rua [label="RUA Disconnect"];
rua abox rua [label="MAP_RUA_ST_DISCONNECTED"];
rua rbox sccp [label="map_check_released()"];
rua rbox sccp [label="hnbgw_context_map_free()"];
...;
...;
...;
--- [label="PCSTATE handling"];
sccp << cn [label="N-PCSTATE.indication\npoint-code unreachable"];
sccp note sccp [label="currently ignored"];
...;
...;
--- [label="Ungraceful release from HNB"];
hnb -x rua [label="link loss"];
rua rbox rua [label="MAP_RUA_EV_HNB_LINK_LOST"];
rua => sccp [label="MAP_SCCP_EV_RAN_DISC"];
sccp => cn [label="SCCP Released"];
sccp abox sccp [label="MAP_SCCP_ST_DISCONNECTED"];
rua abox rua [label="MAP_RUA_ST_DISCONNECTED"];
rua rbox sccp [label="map_check_released()"];
rua rbox sccp [label="hnbgw_context_map_free()"];
...;
...;
--- [label="Ungraceful release from HNB De-Register"];
hnb => rua [label="HNBAP HNB De-Register"];
--- [label="or"];
hnb => rua [label="HNBAP HNB Register\n(HNB restarted)"];
---;
rua rbox rua [label="MAP_RUA_EV_HNB_LINK_LOST"];
hnb <= rua [label="RUA Disconnect"];
hnb note rua [label="TODO: does it make sense to send\nRUA Disconnect per context when HNB is/was gone?\nOr has the HNB implicitly discarded these?"];
rua abox rua [label="MAP_RUA_ST_DISCONNECTED"];
rua => sccp [label="MAP_SCCP_EV_RAN_DISC\nfrom map_rua_disconnected_onenter()"];
sccp abox sccp [label="MAP_SCCP_ST_WAIT_RLSD"];
rua => sccp [label="MAP_SCCP_EV_RAN_DISC\nto skip waiting for SCCP Released from CN"];
sccp => cn [label="SCCP Released"];
sccp abox sccp [label="MAP_SCCP_ST_DISCONNECTED"];
rua rbox sccp [label="map_check_released()"];
rua rbox sccp [label="hnbgw_context_map_free()"];
}