Device-to-device (D2D) communications is regarded as a promising technology for future cellular networks, which can significantly improve both the network spectral efficiency and individual user experience. However, the lack of motivation to utilize the D2D links hinders the deployment of D2D communications in cellular networks. We study the cooperative downloading problem via D2D communications, and propose a scheme, termed as cooperative content download-and-share (CoCoDaS), to stimulate the demand of D2D communications by a simple pricing model in cellular networks, in order to offload traffic burden from base station. In CoCoDaS, the users with the same content demand cooperatively download a large-sized file from the base station (BS) and share their downloaded segments of such content with each other via D2D communications. Simulations verify the efficiency of our proposed CoCoDaS scheme in terms of the reduction of the BS's burden on data services and the utilization of D2D communications.
Bibliographical noteFunding Information:
Manuscript received February 1, 2017; revised March 29, 2017; accepted April 14, 2017. Date of publication April 25, 2017; date of current version August 10, 2017. This work was supported in part by the National Natural Science Foundation of China under grant 61622101, 61572210 and 61571020, Ministry National Key Research and Development Project under Grant 2016YFE0123100, and the National Science Foundation under grant number CNS-1343189. The associate editor coordinating the review of this paper and approving it for publication was Tao Han. (Corresponding author: Xiang Cheng.) L. Fang, R. Zhang, and L. Yang are with the Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO 80523 USA (e-mail: email@example.com; firstname.lastname@example.org; email@example.com).
- Content downloading
- device-to-device communication