User equipment includes a receiving module configured to receive first indication information sent by a first base station. The first indication information includes a time period required by the user equipment to request to access a second base station. The user equipment includes a sending module to send the random access scrambling code to the second base station. The user equipment further includes a notification module to notify the first base station that a secondary cell group failure occurs if the user equipment fails to access the second base station within the time period.