This paper proposes a novel scheduling algorithm called Query-based Scheduling Algorithm(QSA) to address the issue of real-time query processing in on-demand data broadcast environments.

现有的实时数据广播研究中，只考虑了具有截止期约束的单个数据请求的调度问题，而支持实时查询处理的数据广播技术尚未得到足够的关注。

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The problem of deadline and critical are two major characteristics, so it is necessary to do research for a proper real-time processing strategy in order to improve query efficiency.

截止期和关键性是这类应用中的两个突出特征，结合这些特征研究合适的数据流处理技术对提高关键任务型应用的处理效率是非常必要的。

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