Method and system for generating cryptographic-key identification identifier

Abstract

The present invention provides a cipher key identification identifiers generating method, including: the user equipment UE transfers from the Evolved Universal Terrestrial Radio Access Network (EUTRAN) to the Universal Terrestrial Radio Access Network (UTRAN) or global mobile communications system or enhancement type data velocity GSM Evolved Terrestrial Radio Access Network (ETRAN), the UE uses the identification identifiers accessing in the safety management entity cipher key to map and generate an identification identifier of the transferred system cipher key; the mobile management entity uses the identification identifiers accessing in the safety management entity cipher key to map and generate an identification identifier of the encryption key and integrality cipher key, and transmits them to the service GPRS supporting node (SGSN); when the user equipment is transferred from the EUTRAN to the UTRAN, the SGSN stores the encryption key, integrality cipher key and their identification identifiers; and when the user equipment is transferred from the EUTRAN to the GERAN, the SGSN will assign the identification identifier values of the encryption key and integrality cipher key to the identification identifiers of the encryption key of the GERAN.

Description

technical field [0001] The present invention relates to the field of mobile communications, and in particular, to a method for transferring a UE (User Equipment, user equipment) from an evolved terrestrial radio access network (Evolved UMTS Terrestrial Radio Access Network, EUTRAN for short) to a universal terrestrial radio access network When transferring from EUTRAN to GERAN (Universal Terrestrial Radio Access Network, UTRAN for short) or transferring from EUTRAN to GERAN (GSM / EDGE Radio Access Network, Global System for Mobile Communications or Enhanced Data Rates for GSM Evolution Radio Access Network), the key identity identifier generation method and system. Background technique [0002] The 3GPP Evolved Packet System (EPS, Evolved Packet System) is composed of an Evolved Terrestrial Radio Access Network EUTRAN and an EPS Core Network (EPC, Evolved Packet Core). [0003] The EPC includes a mobility management entity (MME, mobility management entity), which is responsi...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a method and system for generating a key identity identifier when the UE transfers between different access systems, so as to solve the problem in the prior art after the UE transfers from EUTRAN to UTRAN or GERAN due to generated during transfer by K ASME The mapped key has no identifier and cannot be reused

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