Intersystem cell switching method, system, user equipment and wireless network controller

The invention discloses an intersystem cell switching method which comprises the following steps: measuring a different system cell according to a different system cell measuring requirement in a system message from a cell broadcast and reporting an obtained measuring result of the different system cell to a radio network controller (RNC) through a radio resource control (RRC) connection establishing request by using user equipment (UE); and resolving the measuring result of the different system cell from the RRC connection establishing request and initiating intersystem cell switching according to the measuring result of the different system cell after the establishment of RRC connection is completed by using the RNC. Moreover, the invention also discloses an intersystem cell switching system, the UE and the RNC. The technical scheme disclosed by the invention can reduce access delay of the UE.