Grouping based inter-cell interference coordination in LTE-A dense small-cell networks

Beamforming Design for Wireless Information and Power Transfer Systems: Receive Power-Splitting Versus Transmit Time-Switching

“…The obtained solution by SDR approach is not guaranteed to be of rank one, i.e., rank(W k,n ) > 1 is mostly observed. Thus, SDR-based solution can serve as an upper bound for max-min rate problem (7) . Similarly, problem (19) in beamforming vectors w k,n is recast as the following rank-one constrained SDP in the outer products W k,n w k,n w By ignoring the rank-one constraint (A.1g), the optimal solution k∈K n∈N k Tr{W k,n } of the SDR formed by (A.2a), (A.2b), (A.1e), (A.1f) provides a lower bound of the actual optimal value of problem (19).…”

“…(17) Using (17), we propose in Algorithm 1 a QP-based iterative algorithm that solves the max-min SINR problem (7). Here, the initial point w…”

“…2 is used. The cell radius is set as 40 m and the BS-to-UE distance as 20 m to enable practical WIPT [7], [8]. For large-scale propagation loss, a pathloss exponent equal to 4 is assumed.…”

“…For example, an radio frequencypowered relay can be opportunistically deployed to extend network coverage without the need to access a main power supply. The wireless power transfer from a base station (BS) to its users (UEs) is viable in a dense small-cell environment, because the close BS-UE proximity enables an adequate amount of radio frequency (RF) energy to be harvested for practical applications [7]- [9].…”

Mobile Small Cells for Further Enhanced 5G Heterogeneous Networks

“…In other words, the higher frequency band can cause more attenuation. There are many challenges to enable NCT for small cell backhaul [17]. Nevertheless, it is expected that various technologies being actively studied will overcome the challenges.…”