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arXiv 1504.06231cs.ITmath.IT
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基于D2D通信的无线分布式存储修复调度

Repair Scheduling in Wireless Distributed Storage with D2D Communication

Jesper Pedersen, Alexandre Graell i Amat, Iryna Andriyanova, Fredrik Brännström

摘要:

我们认为分布式存储(DS)的无线网络中,移动设备到达和离开根据泊松随机过程。内容使用擦除校正码存储在许多移动设备中。当请求一条内容时,用户使用设备到设备通信从移动设备检索内容,或者如果不可能,则以较高的通信成本为代价从基站(BS)检索内容。我们考虑当存储数据的设备离开网络时的修复问题。特别是,我们介绍了一个修复调度定期执行(从存储设备或BS)。我们推导出的维修和下载作为修复间隔的函数的整体通信成本的解析表达式。我们通过给出最大距离可分码和再生码的结果来说明分析。我们的研究结果表明,DS可以降低整体通信成本的情况下,内容只从BS下载,只要维修进行得足够频繁。所需的修复频率取决于用于存储的代码和网络参数。特别地,最小带宽再生码需要非常频繁的修复,而最大距离可分离码如果修复不太频繁地执行则给出更好的性能。我们还表明,瞬时修复并不总是最佳的。

英文摘要:

We consider distributed storage (DS) for a wireless network where mobile devices arrive and depart according to a Poisson random process. Content is stored in a number of mobile devices, using an erasure correcting code. When requesting a piece of content, a user retrieves the content from the mobile devices using device-to-device communication or, if not possible, from the base station (BS), at the expense of a higher communication cost. We consider the repair problem when a device that stores data leaves the network. In particular, we introduce a repair scheduling where repair is performed (from storage devices or the BS) periodically. We derive analytical expressions for the overall communication cost of repair and download as a function of the repair interval. We illustrate the analysis by giving results for maximum distance separable codes and regenerating codes. Our results indicate that DS can reduce the overall communication cost with respect to the case where content is only downloaded from the BS, provided that repairs are performed frequently enough. The required repair frequency depends on the code used for storage and the network parameters. In particular, minimum bandwidth regenerating codes require very frequent repairs, while maximum distance separable codes give better performance if repair is performed less frequently. We also show that instantaneous repair is not always optimal.

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