  With the escalation of the IEEE 802.11 based wireless networks, voice over IP
and analogous applications are also used over wireless networks. Recently, the
wireless LAN systems are spaciously deployed for public Internet services. In
public wireless LAN systems, reliable user authentication and mobility support
are indispensable issues. When a mobile device budges out the range of one
access point (AP) and endeavor to connect to new AP, it performs handoff.
Contemporarily, PNC and SNC were proposed to propagate the MN context to the
entire neighboring AP's on the wireless network with the help of neighbor
graph. In this paper, we proposed a non-overlapping AP's caching scheme (NACS),
which propagates the mobile node context to those AP's which do not overlap
with the current AP. To capture the topology of non-overlapping AP's in the
wireless network, non-overlapping graph (NOG) is generated at each AP.
Simulation results shows that NACS reduces the signaling cost of propagating
the MN context to the neighbor AP's in the wireless network.
