Ack: Indicates that the acknowledgment number field is significant.

ACK：表明确认号字段是有意义的。

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However, how to optimally use these ACK mechanisms and how to schedule data flows are still open issues, which are quite hot topics in this field, as well as our research emphasis in this thesis.

然而协议中并没有对ack机制的优化使用以及如何调度数据流接入作规定，这是目前对于该协议的研究热点，也是本文的研究重点。

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