... COS186HANDOFF IN MOBILE AND WIRELESS NETWORKSUnchanged pathExisting subpathS4COSS2S1S3AP2 AP1MMUPNew subpathS 1−4 : Cellular network switchesCOS : Cross-over switchAP 1−2 : Access pointsFigure ... S2, S3, and S4, which are the cellular network switches• COS, which is the crossover switch• AP1, and AP2, which are the access points.The selection of a particular switch as a COS for a connection...