Greedy Based Radio Resource Allocation Algorithm with Water Filling Power Control Scheme in D2D Underlaying Communication

Abstract

Device to Device (D2D) is communication between two devices directly without the intervention of eNodeB.
This communication can improve sum-rate, spectral efficiency, and decrease the workload of eNodeB
because this communication uses the same spectrum frequency with Cellular User Equipment (CUE).
D2D pair use the same resource simultaneously with CUE to communicate, this communication is called
D2D underlaying communication. D2D and CUE use the same resource and cause interference. This
interference should be managed by a resource allocation algorithm. In this work, the resource is allocated
in a single cell and the communication is from CUE to eNodeB which is called uplink communication. The
joint greedy algorithm with water filling power control scheme is used as a resource allocation algorithm
in this work. This algorithm is compared with the greedy, joint greedy, and greedy algorithm with a water
filling power control scheme. The joint greedy algorithm works based on the capacity of eNodeB and D2D
pair. While water filling power control is used to manage the power of each user based on the channel
condition. After all of the resource is allocated, the parameter performance of the system such as spectral
efficiency, energy efficiency, and D2D fairness are calculated. The simulation result that joint greedy
algorithm with water filling power control scheme obtains 29,34 bps/Hz in spectral efficiency, 0.939 x 10 ⁷
bps/watt in energy efficiency, and 0,996 in D2D fairness.