Abstract
In the hybrid communication scenario of the Heterogeneous Cloud Radio Access Network and Device-to-Device in 5G, spectrum efficiency promotion and the interference controlling caused by spectrum reuse are still challenges. In this article, a novel resource management method, consisting of power and channel allocation, is proposed to solve this problem. An optimization model to maximum the system throughput and spectrum efficiency of the system, which is constrained by Signal to Interference plus Noise Ratio requirements of all users in diverse layers, is established. To solve the non-convex mixed integer nonlinear optimization problem, the optimization model is decomposed into two sub-problems, which are all solvable quasi-convex power allocation and non-convex channel allocation. The first step is to solve a power allocation problem based on solid geometric programming with the vertex search method. Then, a channel allocation constructed by three-dimensional hypergraph matching is established, and the best result of this problem is obtained by a heuristic greed algorithm based on the bipartite conflict graph and µ-claw search. Finally, the simulation results show that the proposed scheme improves the throughput performance at least 6% over other algorithms.
Highlights
As more and more mobile devices are included in the wireless network, the demand for the volume of the access point and the system throughput has a rapid growth.[1,2] By 2025, the total number of the wireless devices will surpass 75 billion, and the corresponding requirement of data is over 3.3 ZB.[3,4] In order to meet the requirement of access capacity and system capacity, the Heterogeneous Cloud Radio Access Network (HCRAN), combined with Device-to-Device (D2D) communication, is introduced into the 5G core network.In traditional wireless network structure, to guarantee the seamless coverage, the high-power node integrated control and forwarding unit is utilized
In order to increase the capacity of the wireless access network effectively, the H-CRAN network is introduced, which adds centralized baseband processing unit (BBU) entities and distributed remote radio heads (RRHs) components while retaining the original highpower node.[5,6,7]
To fully boost advantages brought by D2D and HCRAN, lots of research efforts have been addressed by industry and academia
Summary
As more and more mobile devices are included in the wireless network, the demand for the volume of the access point and the system throughput has a rapid growth.[1,2] By 2025, the total number of the wireless devices will surpass 75 billion, and the corresponding requirement of data is over 3.3 ZB.[3,4] In order to meet the requirement of access capacity and system capacity, the Heterogeneous Cloud Radio Access Network (HCRAN), combined with Device-to-Device (D2D) communication, is introduced into the 5G core network. All BBU units with control plane are grouped together in a centralized location to form a BBU pool aggregating all resources within cloud computing.[8,9,10] BBU pool can realize large-scale radio resource allocation and offer collaborative processing.[11,12,13] BBU controls RRH through fronthaul link while BBU pool communication with traditional high-power node via backhaul links By this way, the networking benefits are fully utilized without increasing the running cost and the energy consumption of network infrastructure. It is of great importance to make reasonable resource allocation
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