Decryption method for trunking group call, and user equipment

A user equipment, comprising:

• a monitoring module configured to monitor group call data of the user equipment in a current cell and obtain, from a base station of the current cell, a hyper frame number of the current cell being a first hyper frame number;
• a transmitting-receiving module configured to, when switching the user equipment from the current cell to a target cell, receive the group call data from a base station of the target cell and obtain 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;
• and
• a processing module connected with the monitoring module and the transmitting-receiving module, and configured to traverse the second hyper frame number according to the interval range of the second hyper frame number and obtain a plaintext according to the second hyper frame number, and compare group call session information contained in the plaintext with the group call data of the current cell;
• and if a comparison result is consistent, decryption by traversing the second hyper frame number being successful, carry out a decryption operation according to the second hyper frame number.

A user equipment, comprising:

• a memory configured to store program instructions;
• a processor configured to monitor group call data of the user equipment in a current cell and obtain, from a base station of the current cell, a hyper frame number of the current cell being a first hyper frame number;
• the processor being further configured to, when switching the user equipment from the current cell to a target cell, receive the group call data from a base station of the target cell and obtain 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;
• and
• a controller configured to traverse the second hyper frame number according to the interval range of the second hyper frame number and obtain a plaintext according to the second hyper frame number, and compare group call session information contained in the plaintext with the group call data of the current cell;
• and if a comparison result is consistent, decryption by traversing the second hyper frame number being successful, carry out a decryption operation according to the second hyper frame number.