To promote the massive video content delivery and to realize the long-term overall cost, the caching and computing functions have to be installed at some intermediate nodes within the networks. This paper presents a cache-aware multicast beamforming design for multicell multigroup multicast, where information-centric networking and mobile edge computing techniques are brought in the multicell multicast system to cache and transcode the contents passing through the nodes. The proposed cache-aware multicast beamforming design jointly optimizes the multicast mode, the caching strategy, and the network-wide beamforming vector, and focuses on minimizing the energy cost of the caching, computing, and communications. To make the formulated problem tractable, a two step method is proposed in this paper, where the first step is devoted to the cache-aware multicast approach design, while the second step is focused on the sparse multicast beamforming design. Furthermore, in order to promote the stabilization of the system, we further design a robust joint optimization strategy for the scenario with the imperfect channel state information. Extensive simulations are conducted to evaluate the performance of our proposed schemes.

Array signal processing, Base stations, Bit rate, energy cost, In-network caching, multicell multicast, Optimization, Robustness, robustness, sparse beamforming, Streaming media, Wireless networks
IEEE Transactions on Vehicular Technology
School of Information Technology

Zhou, Y. (Yuchen), Yu, F.R, Chen, J. (Jian), & Kuo, Y. (Yonghong). (2018). Cache-Aware Multicast Beamforming Design for Multicell Multigroup Multicast. IEEE Transactions on Vehicular Technology. doi:10.1109/TVT.2018.2872966