A wireless communications method for handover, wherein the method comprises: obtaining, by a target intermediate session management network element, information about a source session management network element; and sending, by the target intermediate session management network element, a first message to the source session management network element based on the information about the source session management network element, to establish a forwarding tunnel between a source intermediate user plane network element and a target intermediate user plane network element, wherein the first message comprises forwarding tunnel information corresponding to the target intermediate user plane network element; obtaining, by the target intermediate session management network element, session information from the source session management network element based on the information about the source session management network element, wherein the session information comprises information about an anchor session management network element; and establishing, by the target intermediate session management network element, an downlink tunnel between an anchor user plane network element and the target intermediate user plane network element by sending downlink tunnel information of the target intermediate user plane network element to the anchor session management network element; the source intermediate user plane network element is a user plane network element that is controlled by the source session management network element and that is communicatively connected with a source base station, and the target intermediate user plane network element is a user plane network element that is controlled by the target intermediate session management network element and that is communicatively connected with a target base station. obtaining, by a target intermediate session management network element, information about a source session management network element; and sending, by the target intermediate session management network element, a first message to the source session management network element based on the information about the source session management network element, to establish a forwarding tunnel between a source intermediate user plane network element and a target intermediate user plane network element, wherein the first message comprises forwarding tunnel information corresponding to the target intermediate user plane network element; obtaining, by the target intermediate session management network element, session information from the source session management network element based on the information about the source session management network element, wherein the session information comprises information about an anchor session management network element; and establishing, by the target intermediate session management network element, an downlink tunnel between an anchor user plane network element and the target intermediate user plane network element by sending downlink tunnel information of the target intermediate user plane network element to the anchor session management network element; the source intermediate user plane network element is a user plane network element that is controlled by the source session management network element and that is communicatively connected with a source base station, and the target intermediate user plane network element is a user plane network element that is controlled by the target intermediate session management network element and that is communicatively connected with a target base station.