Air interface key update method, core network node, and radio access system

摘要

The disclosure discloses a method for updating an air interface key, a core network node and a radio access system, wherein the method for updating an air interface key comprises: a core network node receives a relocation complete indication message from a target RNC (S502), the relocation complete indication message is configured to indicate the successful relocation of User Equipment (UE) from a source RNC to the target RNC; the core network node uses the saved traditional key and the current enhanced key to calculate a next hop enhanced key (S504); the core network node sends the next hop enhanced key to the target RNC (S506). Through the disclosure, the forward security of users is guaranteed effectively, thus the communication security of the radio access system is improved overall.