| 摘要 |
PROBLEM TO BE SOLVED: To perform processing of a non-access stratus (NAS) layer (layer 3) in LTE WTRUs, which allows the NAS protocol layer to route layer 3 messages to the correct NAS entity and to encode new NAS message types and information elements.SOLUTION: A new architecture is presented that enables NAS security. When a NAS message is generated, a determination is made as to whether or not to perform encryption, decryption and/or an integrity check on the NAS message on the basis of at least one of a protocol discriminator (PD) of the NAS message, an indicator field in a header of the NAS message, the type of the NAS message, a NAS security state variable, and an indication by an upper layer protocol. The NAS security state variable indicates whether NAS security is currently active or not and may comprise one bit.SELECTED DRAWING: Figure 6 |
