Abstract
The LTE networks are being developed to grant mobile broadband services in the fourth generation (4G) systems and allow operators to use spectrum more efficiently.D2D communication is a promising technique to provide wireless services and enhance spectrum exploitation in the LTE Heterogeneous Networks (HetNets).D2D communication in HetNets allows users to communicate with each other directly by reusing the resources when communicating via the base stations. But during the downlink period, both the D2D receiver and the Heterogeneous Users equipment’s (HUE) experience interference caused by resource allocation. In this article, we identify and analyze the interference problem of HetNets caused by D2D transmitter during download. We propose a combined resource allocation and resource reuse method for LTE HetNets, where resource allocation to HUEs is employed on the basis of comparative fair algorithm and resource reuse to D2D users is employed on acquisitive empirical algorithm. This approach evaluates whether D2D mode is suitable or not by path loss evaluation, after that decreases the interference to HUE by selection of the minimum channel gain between HUE and D2D transmitter each time to mitigate interference. Our simulation results show that the efficiency and throughput of HetNets is improved by using the proposed method.
Highlights
As demands for high data rates increasing, the deficiency of radio resources impedes further growth of Heterogeneous Networks (HetNets) services
We focus on the case in which Heterogeneous Users equipment (HUE) and D2D pairs are multiplexed on the same downlink Orthogonal Frequency Division Multiplex (OFDM) physical resource block (PRB)
The comparative fair (CF) performance is good because CF does consider the channel quality indicator (CQI) and allocates resources in a fair proportion
Summary
As demands for high data rates increasing, the deficiency of radio resources impedes further growth of HetNets services. D2D communication tends to solve the problem by improving spectrum efficiency significantly. D2D communication enables mobile devices to communicate directly with each other, through reusing resources in HetNets [1] [2]. D2D communication can increase the system throughput and the spectral efficiency by reusing the user resource. D2D communication has the advantage that licensed spectrum is allocated to local communication ensuring a secure and robust (against interference) environment [2]. D2D communication is increasing necessity for local communication, such as games between mobile devices, video sharing, data flooding, local advertisement and information broadcast in hot point area like market. Machine to Machine communications in small distance in the Internet things becomes a focus, as a local communication technology [2]
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