Switching method between systems

A system switching and encryption algorithm technology, applied in the field of wireless communication system switching, can solve the problems of encryption key and encryption algorithm conflict, service interruption, not knowing the encryption key of the encryption algorithm of the mobile terminal, etc. The effect of business interruption and reliability assurance

Active Publication Date: 2006-04-05
HUAWEI TECH CO LTD
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Problems solved by technology

[0045] In this way, if the above-mentioned mobile terminal is switched to a GPRS system that does not need to encrypt user data and signaling again, it will cause the GPRS system to fail to recognize the encrypted user data and signaling sent by the mobile terminal, that is, because the GPRS system The SGSN of the mobile terminal does not know what encryption algorithm and encryption key the mobile terminal uses, and the encryption key and encryption algorithm used by the mobile terminal and the SGSN of the GPRS system conflict. The process of the above switching is completely interrupted

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Embodiment Construction

[0069] In order to make the object, technical solution and advantages of the invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0070] According to the method for the mobile terminal of the present invention to switch from the WCDMA system to the GPRS system, when the GPRS system needs to be encrypted, the SGSN normally starts the encryption negotiation process, and completes the negotiation of the key and the encryption algorithm; and does not need to be encrypted in the GPRS system. In the case of GPRS, the SGSN also starts the normal encryption negotiation process, forcing the mobile terminal not to encrypt in the GPRS system, so as to ensure the synchronization of encryption keys and encryption algorithms between the mobile terminal and the SGSN of the GPRS system.

[0071]The following is also divided into two cases of intra-SGSN handover and inter-SGSN handover, and specifically de...

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Abstract

The invention discloses a switch method for mobile terminal from WCDMA to GPRS, which comprises: terminal starts route update operation; during encryption negotiation process, if configuring GPRS to encipher, SGSN sends identification and encipher information contained encryption algorithm and encryption key to terminal; if configuring GPRS not to encipher, SGSN sends identification and encipher information contained forcing terminal stopping enciphering operation to terminal; after receiving said information, the terminal returns response information to SGSN; SGSN updates route. This invention can increases stability for system switch.

Description

technical field [0001] The invention relates to the handover technology of the wireless communication system, in particular to an intersystem handover method for a mobile terminal from a wideband code division multiple access (WCDMA) system to a general packet radio service (GPRS) system. Background technique [0002] Due to the inherent characteristics of the mobile communication system, user data must be exposed to the air interface of the wireless access network during transmission. Therefore, the security of user data transmitted on the air interface is threatened to a certain extent. In order to ensure the security of information and protect the rights and interests of users and operators, the usual solution is to encrypt and transmit user data on the air interface of the wireless access network, so as to prevent user data from being monitored and cracked. [0003] In the GPRS system, the encryption operation of user data and signaling is completed between the mobile te...

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Application Information

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IPC IPC(8): H04Q7/38H04W36/12
Inventor胡伟华
OwnerHUAWEI TECH CO LTD