Patent ID: 8605904

Claim:
A security method in a wireless communication system, for providing a plurality of security associations between a user equipment, a relay node, and a base station node in the wireless communication system, and the security method comprising: authenticating with a serving gateway in the wireless communication system by the user equipment though the relay node, so as to establish a first security association between the user equipment and the relay node; and establishing a second security association between the relay node and the base station node by the relay node through the base station node, wherein the step of establishing the first security association comprises: executing a first authentication procedure with the serving gateway by the user equipment through the relay node; executing a first far-end data security mode command procedure with the serving gateway by the user equipment through the relay node, so that data and control signals transmitted between the user equipment and the serving gateway obtain security protection; and executing a first near-end data security mode command procedure by the user equipment and the relay node, so as to establish the first security association, so that data and control signals transmitted between the user equipment and the relay node obtain security protection.