Sometimes an attachment point (e.g., an AP or a BS) has
to select some of the MNs to be handed over to release some
resources and relieve its heavy load. This kind of handoffs is
initiated by attachment points. For example, there are too
many MNs served by a WLAN AP. Consequently, the AP
cannot offer services to the new calls inside its service area
or the handoff calls from TD-SCDMA. In order to relieve the
heavy load of WLAN, some of the MNs are selected by the
AP and handed over to other nearby attachment points.