Patents by Inventor Xiangyun ZHANG

Xiangyun ZHANG has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Decryption method for trunking group call, and user equipment
    Patent number: 11057765
    Abstract: The invention provides a decryption method for a trunking group call and a user equipment. The method includes: monitoring group call data in a current cell and obtaining a hyper frame number being a first hyper frame number; when switching from the current cell to a target cell, obtaining the group call data and obtaining an interval range of a hyper frame number of the target cell according to the first hyper frame number, the hyper frame number of the target cell being a second hyper frame number; traversing the second hyper frame number according to the interval range of the second hyper frame number, obtaining a plaintext, and comparing group call session information contained in the plaintext with the group call data of the current cell; and if consistent, decryption by traversing the second hyper frame number being successful, carrying out a decryption operation according to the second hyper frame number.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: July 6, 2021
    Assignee: HYTERA COMMUNICATIONS CORPORATION LIMITED
    Inventor: Xiangyun Zhang
  • DECRYPTION METHOD FOR TRUNKING GROUP CALL, AND USER EQUIPMENT
    Publication number: 20190364421
    Abstract: The invention provides a decryption method for a trunking group call and a user equipment. The method includes: monitoring group call data in a current cell and obtaining a hyper frame number being a first hyper frame number; when switching from the current cell to a target cell, obtaining the group call data and obtaining an interval range of a hyper frame number of the target cell according to the first hyper frame number, the hyper frame number of the target cell being a second hyper frame number; traversing the second hyper frame number according to the interval range of the second hyper frame number, obtaining a plaintext, and comparing group call session information contained in the plaintext with the group call data of the current cell; and if consistent, decryption by traversing the second hyper frame number being successful, carrying out a decryption operation according to the second hyper frame number.
    Type: Application
    Filed: January 10, 2017
    Publication date: November 28, 2019
    Inventor: Xiangyun ZHANG