The device with global positioning system (GPS) localization and communication with monitor and control center on construction machinery is a key equipment for construction machinery group management.
智能化工程机械的GPS定位与监控中心的通信装置是实现工程机械机群化管理的关键装置。
Secure group Communication System has been an active research domain, in which the group key management scheme is the most challenging work.
安全群组通信的研究是一个十分活跃的研究领域，群组密钥管理机制的研究是其中最具有挑战性的工作。
Group communication is its important communication method, in which a feasible and effective group key management mechanism is the key precondition for security.
组通信是其重要的通信方式之一，可行和有效的组密钥管理机制是保障组通信安全的关键前提。
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