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Reusing the frequency resources has long been a desirable practice in most licensed wireless networks. In future, frequency reuse will be enabled by advanced technologies like device-to-device (D2D) communication which will allow eNB-free data exchange between end devices. However, the first challenge for devices to establish D2D links will be to ”discover” each other in a distributed manner. Even...
In this paper, we investigate the resource allocation for the video streaming service in the cognitive radio network (CRN) based on orthogonal frequency division multiple access (OFDMA). Considering the channel estimation error between secondary transmitters (STx) and primary receivers (PRx), we address the probabilistic interference constraint model. With imperfect CSI between STx and secondary receivers...
This paper investigates the resource allocation problem in heterogeneous cognitive radio networks (HCRNs). In this paper, two types of users, i.e., multi-homing and single-network cognitive radio users (CRUs), are considered to coexist in HCRNs. Multi-homing CRUs can access multiple networks simultaneously, while single-network CRUs can be served by only one network at a time. With the aim of maximizing...
Inter-Cell Interference Coordination (ICIC) techniques are proposed as solutions to alleviate the negative impact of interference on system performance, while enhancing the provided Quality of Service (QoS). Typically, the available bandwidth is divided into inner and edge sub-bands. Users are also classified into interior and edge users. The available resources in each zone are exclusively allocated...
In order to improve the spectrum utilization rate of Device-to-Device (D2D) communication, we study the hybrid resource allocation problem, which allows both the resource reuse and resource dedicated mode to work simultaneously. Meanwhile, multiple D2D devices are permitted to share uplink cellular resources with some designated cellular user equipment (CUE). Combined with the transmission requirement...
In vehicle-to-vehicle (V2V) communication underlaying cellular networks, interference between cellular users (CUEs) and V2V users (VUEs) can be severe. To address this issue, many studies focused on designing resource allocation schemes to mitigate uplink interference. Most of them investigated the instantaneous resource allocation. In this paper, however, we consider a highway scenario where CUEs'...
In this study, the resource blocks (RB) are allocated to user equipment (UE) according to the evolutional algorithms for long term evolution (LTE) systems. Particle Swarm Optimization (PSO) algorithm is one of the evolutionary algorithms, based on the imitation of a flock of birds foraging behavior through learning and grouping the best experience. Therefore, we propose a Simple Particle Swarm Optimization...
LoRaWAN is emerging as an attractive network infrastructure for ultra low power Internet of Thing devices. Albeit the technology itself is quite mature and specified, how to effectively allocate wireless resources so as to support a large amount of devices in a same terrestrial area is an open challenge. This paper contributes by proposing two algorithms (of incremental complexity) which are shown...
The lifetime of machine to machine (M2M) communication networks plays significant impact on system performance and user quality of service (QoS). To increase network lifetime, efficient resource allocation schemes can be applied. In this paper, we study the network lifetime maximization problem of an M2M communication network consisting one base station (BS) and a number of machine type communications...
With the combination of device-to-device (D2D) communication and millimeter wave (mmWave) technology, the density of communication devices increases greatly and the communication environment becomes more complicated. A key challenge in such networks is interference, which is not only from main lobe, but also from the sidelobe power accumulation. However, the approaches for resource allocation in traditional...
The Device-to-Device (D2D) communication underlaying cellular networks has advantages of improving the spectral utilization, data rate, and energy efficiency. This paper studies a position-based mode selection and resource allocation scheme for D2D communications underlaying cellular networks. With position information available, first an offline channel state information (CSI) retrieval model is...
The increasing demand for underlaying cellular network has benefit form Device-to-Device (D2D) communication, where one need to apply productive plan for resource allocation to increase system capacity and mitigate interference. The bipartite graph matching strategy is used for optimizing the resource allocation among all other strategies; Kuhn-Munkres (KM) is one of algorithm applied to increase...
Underlaying device-to-device (D2D) transmission in cellular wireless systems is one of the promising transmission techniques for fifth generation (5G) and beyond 5G applications. Nevertheless, the interference between the D2D pairs, the interference from cellular users to D2D receivers and the interference that affects the cellular communications should be mitigated to increase the overall system...
Offloading users from an overloaded macro base station (BS) to a lightly loaded small cell BS is critical to alleviate the congestion of the macro BSs. However to overcome the signal-to-interference-plus-noise ratio (SINR) degradation of the offloaded users, offloading should be done in conjunction with an efficient interference management technique. Strict fractional frequency reuse (Strict-FFR)...
In this paper, the problem of joint users' uplink transmission power and rate allocation in NOMA wireless networks is studied, under the scenario that each user is simultaneously requesting multiple services. Each user is associated with a two-variable utility function that represents his satisfaction from his allocated resources (i.e., power and rate). In order to appropriately reflect the combined...
Device-to-Device (D2D) communications are promising technologies to improve the spectrum efficiency, network throughput, and transmission latency for short-range communications in underlaid cellular networks. In this paper, we investigate the resource allocation for multiple D2D pairs in underlaid cellular networks. By utilizing the Power Emission Density-based interference modeling method, the impact...
With the flourish of urban public transportation, a larger amount of users request for high quality service in vehicle environments. Moving relay (MR) is proposed as a solution for enhancing the vehicular users experience. But in high-speed environment, serious Doppler spreading impairs the link quality of MR and Macro Base Stations (MBSs), which will cause inter-carrier interference (ICI) in orthogonal...
Device to Device (D2D) multicast communication is an effective method for local transmission. In this paper, a joint power and resource allocations scheme is proposed to maximize the number of accessed D2D groups while minimizing the total terminal transmission power for D2D underlay multicast communication. Since the derived optimization is a mixed integer nonlinear programming problem with high...
Centralized Radio Access Network (C-RAN) architecture is the enabling technology for the deployment of massive number of antennas essential to meet the requirements of next generation (5G and beyond) mobile systems. In C-RAN the fronthaul links between processing Base Band Units (BBUs) and Remote Antenna Units (RAUs) are conventionally based on fiber optic, although its deployment cost can be excessive...
With the continuous increase of mobile Internet traffic, the user-centric ultra-dense network (UUDN) is proposed as one of the promising solutions to provide very high area throughput density and flexible access service for users. The limited radio resources cause serious competition among numerous APs. Thus, Non-orthogonal multiple access (NOMA), which supports multiple signals transmission on the...
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