在BGC模型框架下，文章对角色进行形式化描述，并分析了基于角色的任务分派。
In frame of BGC model, the formalization of role, and an approach of role-based mission assignment are pictured.
对角色的授权约束加入空间特性，使之能够形式化描述多个层面的空间职责分离约束，从而适用于无线网络的应用环境。
This paper also extends a role-based authorization constraint model to describe constraints with spatial character on different levels, which is suited for wireless network.
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