Access method, device and system of user terminal of SIM (Subscriber Identity Module) card

Abstract

The invention discloses an access method, device and system of a user terminal of an SIM (Subscriber Identity Module) card, used for making a user terminal of an SIM card successfully access an LTE-SAE (Long Term Evolution System Architecture Evolution) system. The method comprises the following steps of: when the user terminal of the SIM card is accessed to the LTE-SAE system, a terminal side and a network side respectively generates an RES on the terminal side and an XRES on the network side by using an agreed first designated algorithm in accordance with an SRES (SIM card authorization response) generated based on an SIM card permanent key Ki and an RAND (Random number), and then the network side carries out authentication on the SIM card in accordance with the RES and the XRES (expected authorization response) and accesses to the LTE-SAE system. Therefore, the SRES returned by the SIM card is converted into the RES capable of being identified in an LTE standard to make the user terminal be successfully accessed to the LTE-SAE system in order to realize a non-card change mechanism in the LTE-SAE system and improve the compatibility of the system. The invention also discloses a corresponding device and system.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for accessing a user terminal with a SIM card. Background technique [0002] At present, in the time division-synchronous code division multiple access (TD-SCDMA) system, the principle of not changing the card is introduced, that is, the users in the TD-SCDMA system continue to use the Subscriber Identity Module (SIM) card instead of replacing it with a universal subscriber identification card. Module (USIM) card, so that users can smoothly upgrade from the second-generation mobile communication system (such as GSM system) to the third-generation mobile communication system (such as TD-SCDMA system), reducing unnecessary operations and achieving good results . [0003] In the process of upgrading from the third-generation mobile communication system to the Long-Term Evolution-System Architecture Evolution (LTE-SAE) system, in order to facilitate user...

AI Technical Summary

Problems solved by technology

[0013] First of all, the RAND and Ki stored in the SIM card and the algorithm used to calculate RES based on RAND and Ki are different from those stipulated in the LTE standard, so they cannot be authenticated by the network side

[0014] Secondly, the SIM card cannot provide the CK and IK required by the mobile station in the communication process. Therefore, the mobile station cannot generate Kasme, then the mobile station cannot use the encryption system of the LTE-SAE system, that is, it cannot successfully access the LTE-SAE

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