An encrypted group call method based on td-lte trunking communication system

Abstract

The invention provides an encrypted group calling method based on a long term evolution (TD-LTE) trunking communication system, which comprises the following steps that: A, building point-to-point safe channels between a terminal and eNB as well as the terminal and a mobility management entity (MME); B, a calling terminal requests the network side to build group calling; the network side generates a conversation key after the allowing determination, and a seed key is generated according to the preset group key and the conversation key; C, the network side distributes uplink resources for the calling terminal, builds a group calling uplink safety mechanism and distributes downlink resources and the conversation key to all called terminals of the current calling, the called terminals generate seed keys according to the conversation keys and the preset group keys, and the network side and the called terminals build group calling downlink and a group calling downlink safety mechanism; and D, the network side gives speaking right to the calling terminal and informs the called terminals to complete the group calling encryption. When the method of the invention is adopted, the down group calling encryption can be realized, and the safety of the group calling is improved.

Description

technical field [0001] The present invention relates to communication technology, in particular to an encrypted group call method based on Time Division-Long Term Evolution (TD-LTE) trunking communication system. Background technique [0002] Due to its unique characteristics of dispatching, group calling and fast calling, the digital trunking communication system has played a huge role in the field of professional communication. The group call service is the most basic service provided by the digital trunking communication system. The group call service allows users to establish a group call to a group of users belonging to a given area, using half-duplex mode; in the process of group call communication, any member of the group can become a speaker, but at any time only It is allowed to have one talker and all other users are listeners. The given area is called a group call area, including a cluster of cells. During call establishment, the system assigns a group call cha...

AI Technical Summary

Problems solved by technology

When implementing group call encryption, the existing TD-LTE-based trunking communication system only encrypts the uplink group call channel, that is, uses the existing standard TD-LTE security mechanism to encrypt the channel between the calling terminal and the MME and the main The channel between the calling terminal and the eNB is encrypted to realize the TD-LTE point-to-point security mechanism, but the existing TD-LTE trunking communication system cannot encrypt the downlink group call channel, which reduces the security of the group call service

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