The handoff decision scheme is presented as follows:
• If the output is less than 4, then the MN chooses TD-SCDMA.
If the current access network is WLAN
then the MN makes a handoff; otherwise, no handoff.
• If the output is more than 6.5, then the MN chooses
WLAN. If the current access network is TD-SCDMA,
then the MN makes a handoff; otherwise, no handoff.
• If the output is between 4 and 6.5, then the MN stays
in the current access network. This could reduce the
unnecessary handoffs and eliminate the ping-pong effect.