PDCP SCHEME FOR Security key management for PDCP distribution in dual connectivity

摘要

The present specification relates to a communication method of a user terminal forming a communication link for data transmission with a macrocell base station and a small cell base station located in a communication system. The communication method comprises the operations of: applying a first base station security key to a communication link with the macrocell base station; generating a second base station security key to be used for a communication link with the small cell base station; applying the second base station security key to the communication link with the small cell base station; and transmitting/receiving user data through the communication link to which the security keys are applied.