Abstract: This application discloses a method of using NH and NCC pairs to resolve security issues. It includes: an MME sends a sequence including multiple NH and NCC pairs to S1GW that is calculated to correspond to a UE. After the S1GW receives a UE handover message or a UE bearer switch message from a base station, the S1GW may choose a next unused NH and NCC pair from the sequence sent by the MME and send it to a target base station. In using this application, part of the bearer switch of the UE or the switch of the UE can be terminated at the S1GW or HeNB GW, which reduces impact on the bearer switch or UE handover from a base station and core network and cuts down on the use of system resources.