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User fairness and spectrum efficiency are conflicting objectives in cellular system optimization given that users share limited spectrum resources. Users at the cell edge are more likely to be unfairly treated due to their disadvantageous locations, where they experience high path losses and strong interferences if co-channel transmission exists. In this paper, a cell edge boundary is obtained and...
Coordinated Scheduling (CS) is one of the main techniques to control inter-cell interference in present (4G) and future (5G) cellular networks. We show that coordination of a cluster of nodes can be formulated as an optimization problem, i.e., placing the Resource Blocks in each node's subframe with the least possible overlapping with neighboring nodes. We provide a clever formulation, which allow...
High throughput satellites have proven to be an excellent solution to provide Internet services to white spots or to complement other existing infrastructures. With the use of multi-beam antennas, the same frequency may be reused dozens of times across a single satellite coverage area, increasing the system capacity and profitability. Legacy frequency reuse patterns such as uncoordinated 4-color scheme...
Non-orthogonal multiple access (NOMA) is a promising technique for the fifth generation mobile communication system due to its high spectral efficiency (SE). Previous works focus on user scheduling or/and power allocation to achieve the maximization of sum rate. However, the energy efficiency (EE) has not been well studied for NOMA systems. In this paper, we aim to optimize user scheduling and power...
We propose a Disruption Aware Routing and link Scheduling (DARS) scheme for multi-hop cognitive radio networks. The objective is to minimize disruptions to secondary user communication sessions due to channel switching and the resource consumption. We formulate the problem into an optimization problem and develop an efficient algorithm to solve the problem. The main idea is to monitor the data rate...
Device-to-Device (D2D) communication is seen as an important step in the LTE-A networks to improve spectral efficiency through reuse of resource blocks (RBs). In a scenario without D2D communication, the base station (referred in LTE-A network as eNB) allocates the RBs to the user equipments (UEs) (i.e., client devices in LTE-A network) based on the Signal-to-Noise Ratio (SNR) reported by them. However,...
In this paper, we study the joint prioritized link scheduling and resource allocation for the OFDMA-based wireless network which serves two classes of user links, namely non-prioritized (low-priority) and prioritized (high-priority) links. Our design objectives are to maximize the number of non-prioritized links to be scheduled and to maximize the weighted sum rate of all scheduled links while guaranteeing...
In this paper, we propose methods to enable efficient data delivery in vehicular ad-hoc networks (VANETs). We target scenarios where data are collected by vehicles and need to be transmitted. Dynamic clusters are formed while vehicles move in order to make data transmissions more robust and scalable. We use mathematical optimization solutions to optimize transmission scheduling so as to maximize throughput...
Resource allocation and interference management for a multibeam multiple input and single output (MISO) satellite communication system are very important to maintain reliable communications and efficient utilization of radio resources. In this paper, we consider two different resource allocation problems which aim at maximizing the system sum rate and the sum utility of all users, respectively. By...
Resource allocation and interference management for a multibeam multiple input and single output (MISO) satellite communication system are very important to maintain reliable communications and efficient utilization of radio resources. In this paper, we consider two different resource allocation problems which aim at maximizing the system sum rate and the sum utility of all users, respectively. By...
In this paper, we present a new approach that seeks reducing the downlink TBS-index by the LTE-A eNodeB. Our objective is to minimize the total transmitted power based on getting the benefit from available but unused PRBs, while considering the QoS for the UEs and mitigating the interference from adjecent eNodeBs. Most previous studies have not assigned the residual PRBs in the eNodeB to change the...
In this paper, priority-aware scheduling to the coexistence of multiple wireless body area networks (WBANs) is addressed. The scheduling is formulated as a nonlinear optimization problem where the objective is to maximize system throughput while guaranteeing the priorities among WBANs. To overcome the inherent complexity issue, a new method, called recursive decomposition algorithm (RDA), is proposed...
Enhanced Inter Cell Interference Coordination (eICIC) is a time-domain technique to achieve load balancing among macro and pico cells in heterogeneous networks (HetNets). eICIC uses two network parameters to address the interference problem: i) Cell Range Extension (CRE) to increase the coverage of pico cells; ii) Almost Blank Subframe (ABS) to reduce the interference for users in pico cells when...
Managing inter-cell interference is one of the main challenges in current and next generation wireless systems that aggressively reuse the frequency. Cooperation between interfering cells has been sought to mitigate interference. In this paper, we address the problem of jointly optimizing the transmit powers, user scheduling, and user association in a cellular network to maximize the weighted sum...
In this paper, a novel approach for joint power control and user scheduling is proposed for optimizing energy efficiency (EE), in terms of bits per unit power, in ultra dense small cell networks (UDNs). To address this problem, a dynamic stochastic game (DSG) is formulated between small cell base stations (SBSs). This game enables to capture the dynamics of both the queues and channel states of the...
In this paper, we investigate multi-cell coordinated scheduling and power allocation in downlink long term evolution advanced (LTE-A) systems, where orthogonal frequency division multiple-access (OFDMA) is used. The proposed scheme performs joint scheduling, power allocation, and modulation and coding scheme (MCS) selection to maximize the overall weighted throughput with proportional fairness. Our...
In this paper, we propose an uplink channel- and buffer-aware scheduling and resource allocation algorithm for a multi-cell LTE-A network that exploits the number of bits waiting for transmission in each user's buffer, referred to as buffer length, in addition to the wireless channel state information. The algorithm also takes into account the constraints imposed by the 3GPP standards on how the radio...
We study joint routing, scheduling, and physical network coding (PNC) in fixed wireless multihop networks under a physical interference model. The objective is to quantify the throughput gain provided by PNC in wireless mesh networks. We formulate a cross-layer optimization framework to determine the optimal max-min throughput of the flows and the optimal configuration of the routing and scheduling...
We consider an LTE-A heterogeneous network involving a set of low-power remote radio heads (RRHs) connected to the macro BS through optical fibers. RRHs share the same cell ID with the macro BS such that coordinated multi-point (CoMP) operations can be performed in a finer granularity without triggering frequent handover operations. We first formulate an optimization problem for coordinated scheduling...
Intercell interference severely degrades the performance of cell-edge users in cellular networks. To effectively manage the intercell interference, a heuristic scheme that jointly considers user scheduling and power control is proposed for multicell orthogonal frequency division multiple-access (OFDMA) networks with BS cooperation and limited backhaul capacity. First, a greedy user scheduling is proposed,...
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