A method for end-to-end encryption of location sharing for PDT / DMR intercom

By adopting a dual-layer signaling architecture and 0-180° latitude/0-360° longitude mapping technology in the PDT/DMR walkie-talkie system, end-to-end encrypted location sharing is achieved, solving the problems of low positioning data accuracy and insufficient security, and ensuring the secure transmission and encrypted processing of location information.

CN122340458APending Publication Date: 2026-07-03SICHUAN HAIGE HENGTONG PRIVATE NETWORK TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SICHUAN HAIGE HENGTONG PRIVATE NETWORK TECH CO LTD
Filing Date
2026-04-30
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing PDT/DMR walkie-talkie systems suffer from low positioning data transmission accuracy and insufficient security, and their encryption mechanisms are weak, making them vulnerable to theft and tampering by attackers, leading to the leakage of location information and tactical intentions.

Method used

It adopts a two-layer signaling architecture (POS_CMD control signaling and POS_INF data frame) and 0-180° latitude/0-360° longitude mapping technology. Encryption and decryption are completed through the walkie-talkie/dispatch terminal side to achieve end-to-end encrypted location sharing and ensure that the location data exists in ciphertext form in the transmission link.

Benefits of technology

It improves the transmission accuracy and security of positioning data, eliminates the risk of plaintext transmission of location information, and ends the vulnerability of static keys, making it suitable for critical mission scenarios such as public safety and disaster relief.

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Abstract

This invention discloses an end-to-end encrypted location sharing method for PDT / DMR walkie-talkies, solving the problems of low positioning data accuracy, insecure transmission, and unreliable encryption during walkie-talkie location sharing. The method includes: a dispatch terminal / authorized walkie-talkie sending a location sharing control signaling POS_CMD, which, according to the CSBK signaling definition in the extended PDT / DMR standard, initiates / dissolves a sharing event and determines the sharing event mode; the called walkie-talkie sends an end-to-end shared location information data frame POS_INF, which uses Data Type=0xF, multiplexes the physical layer encoding format of a 3 / 4 coding rate data frame to carry encrypted location information, and employs a 0-180° latitude / 0-360° longitude mapping, with the KeyFrame field sharing the ciphertext; and the dispatch terminal / member walkie-talkie decrypts the POS_INF data frame and reconstructs the location information. This method achieves encrypted control information sharing with the ciphertext, with the entire encryption / decryption process completed on the walkie-talkie / dispatch terminal side, improving data security and preventing location information exposure.
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Citation Information

Patent Citations

  • Position sharing system and communication method based on interphone ad hoc network

    CN117061995A