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msc {
hscale="2";
pcu [label="PCU"], sgsn [label="SGSN"];
|||;
pcu rbox sgsn [label="(1) Initial Configuration after [re] start of PCU with NSEI 1024"];
--- [label="SNS-Size procedure to inform SGSN of PCU NS-VC capacity"];
pcu -> sgsn [label="SNS-SIZE (NSEI=1234, MAX-NR-NSVCS=8, NUM-IP-EP=1)"];
pcu <- sgsn [label="SNS-SIZE-ACK (NSEI=1234)"];
--- [label="PCU-originated SNS-CONFIG: Configure SGSN downlink flows"];
pcu -> sgsn [label="SNS-CONFIG (NSEI=1234, List of PCU side IPv4/IPv6 Elements)"];
pcu <- sgsn [label="SNS-CONFIG-ACK"];
--- [label="SGSN-originated SNS-CONFIG: Configure PCU uplink flows"];
pcu <- sgsn [label="SNS-CONFIG (NSEI=1234, List of SGSN side IPv4/IPv6 Elements)"];
pcu -> sgsn [label="SNS-CONFIG-ACK"];
|||;
pcu rbox sgsn [label="(2) Establishment of full mesh of NS-VCs: Each PCU side EP to each SGSN side EP"];
--- [label="NS-ALIVE procedure to the first SGSN-side IPv4 Endpoint"];
pcu -> sgsn [label="NS-ALIVE"];
pcu <- sgsn [label="NS-ALIVE-ACK"];
--- [label="NS-ALIVE procedure to the second SGSN-side IPv4 Endpoint"];
pcu -> sgsn [label="NS-ALIVE"];
pcu <- sgsn [label="NS-ALIVE-ACK"];
|||;
pcu rbox sgsn [label="(3) Establishment of BSGGP Virtual Connections (BVC)"];
--- [label="BVC-RESET of the (PCU global) Signaling BVC"];
pcu -> sgsn [label="NS-UNITDATA( BVC-RESET (BVCI=0) )"];
pcu <- sgsn [label="NS-UNITDATA( BVC-RESET-ACK (BVCI=0) )"];
|||;
--- [label="BVC-RESET of the PTP BVC of the first cell in the BSS"];
pcu -> sgsn [label="NS-UNITDATA( BVC-RESET (BVCI=999, RA-ID 262-42-13135-0) )"];
pcu <- sgsn [label="NS-UNITDATA( BVC-RESET-ACK (BVCI=999) )"];
...;
--- [label="BVC-RESET of the PTP BVC of the Nth cell in the BSS"];
pcu -> sgsn [label="NS-UNITDATA( BVC-RESET (BVCI=543, RA-ID 262-42-24675-0) )"];
pcu <- sgsn [label="NS-UNITDATA( BVC-RESET-ACK (BVCI=543) )"];
}
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