... COS
186
HANDOFF IN MOBILE AND WIRELESS NETWORKS
Unchanged path
Existing subpath
S4
COS
S2
S1
S3
AP2 AP1
MMUP
New subpath
S 1−4 : Cellular network switches
COS : Cross-over switch
AP 1−2 : Access ... 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