arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.00481cs.ITmath.IT
收藏

在CSMA环境中最大限度地减少信息使用时间

Minimizing The Age of Information in a CSMA Environment

Ali Maatouk, Mohamad Assaad, Anthony Ephremides

摘要:

在本文中,我们研究了一个网络的N个干扰链路竞争的信道发送他们的数据,采用著名的载波侦听多址(CSMA)方案。通过利用随机混合系统的概念,我们找到了一个封闭形式的总平均年龄的网络在这种情况下。在此基础上,我们通过校准每个链路的退避时间来最小化网络的总平均年龄的优化问题。通过分析其结构,优化问题转化为一个等价的凸问题,可以有效地解决每个链路的最佳退避时间。提供了有关链路之间交互的见解,并给出了我们在IEEE 802.11环境中优化的CSMA方案的数值实现,以强调其性能。我们还表明,虽然优化,标准的CSMA方案仍然缺乏落后于其他分布式计划的平均年龄在某些特殊情况下。这些结果表明,有必要找到新的分布式方案,以进一步减少任何一般网络的平均年龄。

英文摘要:

In this paper, we investigate a network of N interfering links contending for the channel to send their data by employing the well-known Carrier Sense Multiple Access (CSMA) scheme. By leveraging the notion of stochastic hybrid systems, we find a closed form of the total average age of the network in this setting. Armed with this expression, we formulate the optimization problem of minimizing the total average age of the network by calibrating the back-off time of each link. By analyzing its structure, the optimization problem is then converted to an equivalent convex problem that can be solved efficiently to find the optimal back-off time of each link. Insights on the interaction between the links is provided and numerical implementations of our optimized CSMA scheme in an IEEE 802.11 environment is presented to highlight its performance. We also show that, although optimized, the standard CSMA scheme still lacks behind other distributed schemes in terms of average age in some special cases. These results suggest the necessity to find new distributed schemes to further minimize the average age of any general network.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑