Improving security of pack-mode transmission in mobile communication system
A technology for a mobile communication system and a mobile station, which is applied in the field of security improvement in a packet mode, can solve problems such as short control messages, and achieve the effect of a simple and easy protection method.
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[0020] image 3 The structure of the encrypted GPRS frame F of the present invention is given. We first assume that the invention applies to a system in which the data portion of frame F is transmitted encrypted, whereby the key is changed between two adjacent frames. and figure 2 Compared to the conventional frame shown in , an additional information field is appended to the data part of frame F of the present invention, the content of which field is different in each successive frame. The content of the additional information field 3 can simply be the number of the frame F. The receiver, that is, the GSN node or the mobile station MS, can compare the frame number in the additional information field 3 with the frame number often used in the connection and sent in the frame header 1. The sender and receiver can generate frame numbers alternately by themselves by assigning running numbers to frames F. If the frame number in the additional information field 3 is inconsistent...
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