| Popis: |
In this paper,a resource management framework is presented for non-orthogonal multiple access (NOMA)-enhanced scalable video coding (SVC) multicast in heterogeneous networks (HetNets).In this framework,radio spectrum slicing for different base stations,spectrum partition for multiple groups within each spectrum slice,and transmit power division within each multicast group are jointly considered,to maximize the overall video quality experienced by user equipment in multicast groups.For tractability,the joint resource management problem is formulated as an integer linear programming problem,with theconsi-deration of different video requests,varying device locations,and inter-cell interference.The formulated optimization problem is decoupled into an intra-group transmit power division problem and a multi-group spectrum partition and inter-slice spectrum partition problem.The former subproblem obtains the optimal transmitting power for each layer of superposition coding through multiple cycles.The latter subproblem is solved optimally by the knapsack algorithm.Simulation results show that the proposed scheme is superior to the existing scheme in spectral efficiency and average video quality of each user equipment. |
