Target network selection method and access point device

摘要: The invention discloses a target network selection method and an access point device which are used for achieving link switch of mobile terminal between heterogeneous wireless networks. comprises the following steps that: service current switches preparation request message to surrounding networks by broadcast; various points calculate support margin value local set calculation rule according usable resource information demand determine timing time is in inverse proportion value; when reaches, broadcast initial response; receives first returned response switching equipment, then sends indicates switch. Whenbeing applied switching, greatly reduces transmission quantity signals, simplifies signaling interactive flow delay.