Method for protecting the integrity of messages in a mobile communications system

Abstract

The present invention provides a method of protecting the integrity of messages sent between a mobile terminal and a server radio access network controller in a mobile radio system, in which method a message sent is protected by a code calculated on sending and, in the event of a change of server radio access network controller from a source controller to a target controller, a message sent to the mobile terminal by the source controller, for forwarding to the mobile terminal information created in the target controller and then transferred by the target controller to the source controller, is protected by a code calculated in the target controller.

Description

[0001] This application is a divisional application of the invention patent application with the application number "03153353.1", the application date is "August 11, 2003", and the invention title is "A method for protecting the integrity of messages sent in mobile wireless systems" . technical field [0002] The invention relates to mobile radio systems. The invention is particularly applicable to third generation mobile radio systems, specifically the Universal Mobile Telecommunications System (UMTS). Background technique [0003] Generally speaking, a mobile wireless system is defined by a series of standards, and more information can be obtained from corresponding standards published by corresponding standard organizations. [0004] figure 1 An overview gives the general architecture of the mobile wireless system, basically including: [0005] - Radio Access Network (RAN)1 and [0006] - Core Network (CN)4. [0007] RAN is composed of base station 2 and base station...

AI Technical Summary

Problems solved by technology

[0055] -The source SRNC must decode the RRC information unit to verify the MAC-I code calculation parameters, and then calculate the MAC-I code based on these parameters, which has the disadvantage of increasing the processing capacity and complexity of the source SRNC,

[0056] - The source SRNC must be able to implement the type of algorithm selected by the target SRNC, or in other words, the algorithm selected by the target SRNC cannot be different from the algorithm implemented in the source SRNC; in other words, its defect is that there are relatively strict restrictions or lack of flexibility, as well as

[0057] - In order to transmit RRC information in RANAP messages, the target SRNC must use a format known to the source SRNC, or in other words, the format chosen by the target SRNC must be known to the source SRNC; in other words, its drawback is that there are relatively strict restrictions or Lack of flexibility (such as the following situation: when specifying a new protocol type, one of the two SRNCs is using the new version and the other is using the old version)

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