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.

Inactive Publication Date: 2004-04-21
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typical control messages are so short that even if an intruder doesn't know the keys, he or she may try to find them out through a large-scale attack

Method used

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  • Improving security of pack-mode transmission in mobile communication system
  • Improving security of pack-mode transmission in mobile communication system
  • Improving security of pack-mode transmission in mobile communication system

Examples

Experimental program
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Embodiment Construction

[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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Abstract

In General Packet Radio Service GPRS, the data are coded into frames (F) with a given length and comprising a header (1) and a data portion (2). An intruder can interfere with GPRS communication by transmitting unauthorized copies of transmitted messages, or sending false messages and interfere with communication integrity. The reliability of GPRS communication is improved by modifying the frame (F) used on a GPRS connection so that possible extra copies of the frames can be revealed. This can be achieved e.g. by adding an extra information field (3) to the data portion (2) of a GPRS frame (F), the contents of the field being modified between two frames (F). The contents of the extra information field (3) can include the identity of the frame (F), the TLLI of the connection, the IMSI or MSISDN of the mobile station, or an identity formed by an algorithm generating pseudo-random numbers. A second extra information field (4) can be added to the data portion (2) of the frame (F), the field being preferably formed by a different algorithm than the first extra information field (3).

Description

field of invention [0001] The invention relates to the improvement of the security of the grouping mode in the mobile communication system. Background technique [0002] Fig. 1 is a part of cellular mobile communication system necessary for the present invention. The mobile station MS communicates with the base transceiver station BTS via the air interface Um. The base stations are controlled by a base station controller BSC associated with a mobile switching center MSC. The subsystems (including the base stations BTS controlled by the subsystems) managed by the base station controller BSC are generally called base station subsystems BSS. The interface between the central MSC and the base station subsystem BSS is called the A-interface. The part of the A-interface on the side of the mobile services switching center MSC is called the network subsystem NSS. Correspondingly, the interface between the base station controller BSS and the base stations BTS is called the second...

Claims

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Application Information

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IPC IPC(8): H04L9/14H04L9/32H04L29/06H04W12/02
CPCH04W12/02H04L63/12H04L63/0428H04W12/033
Inventor 汉努·卡里阿托·卡帕南
Owner NOKIA TECHNOLOGLES OY
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