Method for implementing safety parameter synchronization in clustering system

Abstract

The invention discloses a method for implementing safety parameter synchronization in a moving scene in a clustering system. The method is characterized by comprising the steps that transmitting terminal hyper frame number (TX_HFN) configuration information of a neighboring area is broadcast and transmitted to a clustering terminal within a second area by a base station in which the second area is positioned; the TX_HFN configuration information of the neighboring area is received by the clustering terminal within the second area, and the TX_HFN configuration information, which corresponds to underway group calling, of the neighboring area is stored and recorded; after the clustering terminal moves to the neighboring area of the second area to perform the area selection, a latest TX_HFN value of the current underway group calling in the current area is obtained in the stored TX_HFN configuration information of the neighboring area by the clustering terminal according to a global area identification of the current area and a group number in a downlink broadcast message received by a wireless protocol. According to the method, a TX_HFN of the current group calling in a target area can be obtained in time by the clustering terminal, so as to guarantee the continuity of the clustering group calling business in the moving scene.

Description

technical field [0001] The present application relates to the technical field of mobile communication, in particular to a trunking system, and in particular to a method for realizing security parameter synchronization in the trunking system. Background technique [0002] In an LTE-based communication system, in order to protect the security of air interface transmission signaling and data, the packet data convergence protocol (PDCP, Packet Data Convergence Protocol) layer performs encryption, decryption and integrity protection, where the security parameter (COUNT) is PDCP One of the important input parameters for the air interface encryption and integrity protection of the layer. The COUNT parameter has a total of 32 bits, such as figure 1 As shown, it consists of a high-order hyperframe number (HFN, Hyper Frame Number) and a low-order PDCP sequence number (SN), where the PDCP SN is the sequence number assigned to the PDCP SDU by the PDCP layer, with a length of 7 bits or ...

AI Technical Summary

Problems solved by technology

Although this solution is applicable to the downlink multicast mechanism, it can solve the HFN synchronization problem of late access users, but for mobile UEs, the synchronization can only be obtained by monitoring the HFN configuration message through the late access cycle, which will cause UE Within a period of time after the move (the maximum is the late access period), the trunking group call service cannot be heard, which affects the continuity of the trunking group call service

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