Research Article
Handover Based IMS Registration Scheme for Next Generation Mobile Networks
Pseudocode 3
IPSec SAs handling at old P-CSCF.
| PCSCFold receives request | | IF method == HANDOVER then | | Add IPSec SAs to T-IPSecSAs | | Path = discovered-PCSCF; | | Integrity-Protected = “yes”; | | Route to S-CSCF | | ELSEIF method == ”REGISTER” | | route REGISTER to ICSCF | | IF status == 401 | | STATE Remove CK, IK | | ELSE | | STATE reply( 500 , P-CSCF Error on Removing CK, IK ); | | ENDIF | | ENDIF | | IF status == 200 then | | Route “OK” to UE | | ENDIF | | IF P-CSCFold != P-CSCFnew | | Delete IPSec SAs | | ENDIF |
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