End-to-end voice encrypting method for low-speed narrowband wireless digital communication

A voice encryption, digital communication system technology, applied in the field of digital mobile communication systems, can solve the problems of low communication rate, voice quality degradation, affecting user experience, etc., to ensure continuity, improve synchronization efficiency, and avoid voice interruption.

Inactive Publication Date: 2011-04-06
THE FIRST RES INST OF MIN OF PUBLIC SECURITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Obviously, the DMR system cannot directly apply the end-to-end voice encryption synchronization mechanism in the TETRA standard
There are two reasons: (1) The communication rate of the DMR system is lower than that of the TETRA system, a CSBK signaling can only carry 80bits of information, and even a 30ms time

Method used

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  • End-to-end voice encrypting method for low-speed narrowband wireless digital communication
  • End-to-end voice encrypting method for low-speed narrowband wireless digital communication
  • End-to-end voice encrypting method for low-speed narrowband wireless digital communication

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Embodiment 1

[0043] Embodiment 1: The present invention relates to an end-to-end voice encryption method suitable for a low-speed narrowband wireless communication system, and can be applied to digital mobile communication systems of various systems. Here, the DMR digital trunking system is used as an example for description.

[0044] 1. End-to-end encrypted voice coding scheme

[0045] When communicating in plain language, the DMR system selects a speech coding algorithm with a code rate of 2.4Kbps. When the end-to-end voice encryption is adopted, in order to transmit the voice frame sequence number, the present invention needs to occupy 15 bits in the 60ms voice frame. In this way, the data length after 60ms speech encoding needs to be shortened to 129bits, that is, the actual speech encoding rate is reduced to 2.15Kbps when end-to-end encryption is adopted. Speech frame structure for end-to-end encryption, such as figure 1 shown.

[0046] The 15bits voice frame serial number can sup...

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Abstract

The invention provides an end-to-end voice encrypting method for a low-speed narrowband wireless digital communication system, which has the main idea that synchronous control information in a conversation process is divided into two parts; one part is unchanged in the whole conversation process, and the other part is constantly changed along with a voice frame; the unchanged part is transmitted when a calling is started by a control signaling, and the changed part is transmitted along with voice data. Accordingly, synchronous control information needing to be frequently transmitted is effectively reduced. The synchronous mechanism provided by the invention has the advantages of solving the problem of voice interruption, ensuring the continuity of voice, not frequently carrying out legality check on the synchronous control information in the conversation process, effectively improving synchronizing efficiency, preventing the condition that a plurality of continuous voice frames can not be decrypted and solving the problems caused by limited carrying capacity in the low-speed narrowband wireless communication system.

Description

technical field [0001] The invention belongs to the field of communication, and relates to an end-to-end voice encryption method for a low-speed narrowband wireless digital communication system, which can be applied to digital mobile communication systems of various systems. Background technique [0002] The main idea of ​​end-to-end voice encryption is: the voice is encrypted at the sending end and decrypted at the receiving end, so as to ensure that the voice does not exist in plaintext in the device nodes between the calling party and the called party. [0003] Stream cipher algorithm is very suitable for end-to-end voice encryption with high real-time requirements due to its advantages of no error diffusion and pre-calculation. In the process of using the stream cipher algorithm, the calling party and the called party must be synchronized to implement encryption and decryption correctly, that is, the calling party and the called party use the same key stream to encrypt o...

Claims

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Application Information

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IPC IPC(8): H04W12/02H04B7/26
Inventor 朱振荣周昕陈妍蒋庆生王为民钱志红
Owner THE FIRST RES INST OF MIN OF PUBLIC SECURITY
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