Cache-Enabled Uplink Transmission in Wireless Small Cell Networks

Abstract

It is starting to become a big trend in the era of social networking that people produce and upload user-generated contents to the Internet via wireless networks, bringing a significant burden on wireless uplink networks. In this paper, we contribute to designing and theoretical understanding of wireless cache-enabled uplink transmission in a delay-tolerant small cell network to relieve the burden, and then propose the corresponding scheduling policies for the small base station (SBS) with a limited cache size. Specifically, the cache ability introduced by the SBS enables the SBS to eliminate the redundancy among the upload contents from users. This strategy not only alleviates the wireless backhaul traffic congestion from the SBS to a macro base station (MBS) but also improves the transmission efficiency from users to the SBS. We then investigate the scheduling scheme to offload more data traffic under caching size constraint. Finally, numerical results are provided to demonstrate the significant performance gains of the proposed wireless cache-enabled upload network.