Edge Caching With Transmission Schedule for Multiuser Multirelay Networks
Fasheng Zhou, Lisheng Fan, Xianfu Lei, Gaoyong Luo, Haijun Zhang, Junhui Zhao · IEEE Communications Letters · 2018
We propose an edge caching scheme with transmission schedule for multiuser multirelay networks, where the communication from the source to users is assisted by intermediate relays. We assume that each intermediate relay has a capacity-limited cache which can cache the contents that users request from the source. To improve the outage performance in this network, contents are cached at all relays or at a cluster formed by partial relays according to their popularities. Furthermore, transmissions for contents with different popularities are scheduled. We optimize the cache placement by minimizing the average outage. Therefore, cache placement can be dynamically updated according to the optimization outcome. The performance of our method is compared with the existing schemes via numerical studies.