Method, device and system for retention alarm in closed space

• Main Authors: LIU YAFAN, GUO XUAN, YANG LIBIAO, SHAO QIMING, ZHENG MINGJI, ZHENG SHEN, SHEN RONG, WU YINWEI
• Format: Patent
• Language: Chinese; English
• Published: 27.08.2021
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; WIRELESS COMMUNICATIONS NETWORKS

The invention discloses a method for retention alarm in an enclosed space, which is applied to a management platform, and comprises the following steps: obtaining ranging signals periodically sent to a first micro base station and a second micro base station by a mobile terminal at the same time, the power of the ranging signals being less than a preset threshold, and the first micro base station and the second micro base station being located at fixed positions in the enclosed space; periodically determining the position of the mobile terminal in the closed space according to the ranging signal; and judging whether the position of the mobile terminal is changed within a first preset duration, and sending out an alarm signal after the judgment result is that the position of the mobile terminal is not changed. Correspondingly, the invention further provides a device and a system for retention alarm in the closed space. The method, the device and the system are based on wireless communication between workers in