用户通信代价是分布式系统性能的一个重要方面。
Communication cost is an important aspect of the performance of distributed systems.
特别是当今越来越普及的移动计算环境下，降低通信代价的意义尤其重大。
It is of significant value to reduce users' communication cost to the lowest possible degree, especially in the mobile computing environment that is becoming more and more prevailing.
现有的无响应流控制方法存在某些缺陷，如通信代价过高，或者适用面过于狭窄。
Methods for unresponsive flow regulation either have high communication costs or have very narrow applications.
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