solidot新版网站常见问题,请点击这里查看。
消息
本文已被查看6456次
Decentralized Caching Schemes and Performance Limits in Two-layer Networks. (arXiv:1606.09076v2 [cs.IT] UPDATED)
来源于:arXiv
We study the decentralized caching scheme in a two-layer network, which
includes a sever, multiple helpers, and multiple users. Basically, the proposed
caching scheme consists of two phases, i.e, placement phase and delivery phase.
In the placement phase, each helper/user randomly and independently selects
contents from the server and stores them into its memory. In the delivery
phase, the users request contents from the server, and the server satisfies
each user through a helper. Different from the existing caching scheme, the
proposed caching scheme takes into account the pre-stored contents at both
helpers and users in the placement phase to design the delivery phase.
Meanwhile, the proposed caching scheme exploits index coding in the delivery
phase and leverages multicast opportunities, even when different users request
distinct contents. Besides, we analytically characterize the performance limit
of the proposed caching scheme, and show that the achievable rate region of the
propo 查看全文>>