KEY UPDATE METHOD, SUB BASE STATION, TERMINAL, COMMUNICATION SYSTEM AND STORAGE MEDIUM

摘要

The present invention relates to the field of communications. Disclosed are a sub base station key update method, sub base station, terminal and communication system. The sub base station key update method comprises: deriving a new sub base station key according to the current sub base station key and an inside sub base station counter (ISC), the ISC being a count value for deriving the sub base station key (S110). Also disclosed in the present invention is a computer storage medium.