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In Cognitive Radio Networks (CRNs), the spectrum underlay approach enables primary and secondary networks to transmit simultaneously, as long as the interference from the secondary network to the primary network is below certain threshold. As the recent advancement of the underlay approach, the transparent coexistence exploiting MIMO interference cancellation was proposed. Previous works assume that...
In heterogeneous cellular networks, a macro base station(MBS) power control algorithm based on macro users' fairness is proposed in this paper. In this algorithm, macro users choose channels based on the interference from femtocells. Then, the power solution of MBS in every channel is derived through the non-cooperative game. The constructed game utility function considers not only the system capacity,...
A Wireless Body Area Network (WBAN) is a network of wireless sensors and medical equipments located inside or outside the human body for collecting biological signals for various medical and non-medical applications. IEEE 802.15.6 was developed as the standard for WBAN where nodes can access the channel via contention access or contention free access. In this paper, only contention access is considered...
The efficient allocation of multi-interface multi-channel Wireless Mesh Network channel resources is a hot topic recently. Effective channel management mechanisms need to be designed to ensure the full and efficient use of channel resources. In this paper, combined with the channel load that network buyers perceived, the channel reassignment problem of multi-interface multi-channel Wireless Mesh Network...
Broadband wireless communication is of critical importance during public safety scenarios as it facilitates situational awareness capabilities for first responders and victims. In this paper, the use of LTE-Unlicensed (LTE-U) technology for unmanned aerial base stations (UABSs) is investigated as an effective approach to enhance the achievable broadband throughput during emergency situations...
Abstract-In cognitive radio networks, secondary users (SUs) face two conflicting objectives. Each SU seeks to minimize the sensing duration while maximizing the detection probability of primary users (PU) to avoid interfering with their transmissions. Both objectives have a substantial effect on energy efficiency. This paper investigates a noncooperative setting for selecting the sensing duration...
Full-Duplex (FD) wireless and Device-to-Device (D2D) communication are two promising technologies that aspire to enhance the spectrum and energy efficiency of wireless networks, thus fulfilling key requirements of the 5th generation (5G) of mobile networks. Both technologies, however, generate excessive interference, which, if not managed effectively, threatens to compromise system performance. To...
The purpose of this paper is to introduce a POLCA simulation game that can educate engineering students and industry professionals on POLCA material flow control mechanism. This POLCA game provides a hands-on experience, experiential learning to enable a deeper understanding on POLCA system. Comparison between original POLCA and SPT-POLCA is experimented using this simulation game. This article describes...
As the explosive growth of wireless date requirements, heterogeneous network (HetNet) has become an effective solution for improving the system performance such as the throughput. The femtocells are always arranged to share the spectrum with the macro base stations (MBSs). Thus, the co-channel interference leads to the degradation of the HetNet throughput. In this paper, we discuss the program of...
The proliferation of novel network access devices and demand for high quality of service by the end users are proving to be insufficient and are straining the existing wireless cellular network capacity. An economic and promising alternate to enhance the spectral efficiency and network throughput is device to device (D2D) communication. However, enabling D2D communication poses significant challenges...
In this paper, we present a power allocation technique that improves the sum rate and energy efficiency without reducing the minimum data rate of an established resource block allocation technique. To achieve this, the technique is implemented in two stages where the first is for ensuring that the minimum data rate remains unchanged. The second stage is for increasing the sum rate by ensuring that...
Decentralized cognitive radio networks (CRN) require efficient channel access protocols to enable cognitive secondary users (SUs) to access the primary channels in an opportunistic way Without any coordination. In this paper, we develop a distributed spectrum access protocol for the case where the SUs aim to maximize the total system throughput while competing for spectrum resources. To model the...
Carrier aggregation, which allows users to aggregate several component carriers to obtain up to 100 MHz of bandwidth, is one of the central features envisioned for next generation cellular networks. While this feature will enable support for higher data rates and improve quality of service, it may also be employed as an effective interference mitigation technique, especially in multi-tier heterogeneous...
The user association is still a key technical challenge in small-cell networks due to significantly difference from traditional macro-cell networks. For avoiding blindness of pursuing higher date rate and achieving the more rational user association, a novel method to associate user to small base station (SBS) based on user quality of experience (QoE) is proposed in this paper. The user-cell association...
In this paper, we investigate the hybrid access control in two-tier small cell networks from the perspective of incentive mechanism design, considering macro base station's private information. We formulate this problem as a Stackelberg game. To be specific, the macro base station (MBS) and small cell base stations (SBSs) are modeled as a leader with specific payoff preference and followers, respectively...
Consider the diversity of users' traffic types, we investigate the problem of distributed carrier aggregation in cognitive small cell networks. In most existing carrier aggregation (CA) researches, they aimed to optimize the throughput or to mitigate the interference. However, in practical wireless communication users' quality of experience (QoE) is the ultimate concerning. Different QoE functions...
Nowadays, cognitive small cell networks (CSCNs) have been widely accepted as a promising and efficient method to deal with exponentially increasing demand of wireless data services. As small cells become smaller and denser, inter-cell interference (ICI) at user equipments (UEs), coming from adjacent base stations (BSs), expanded dramatically and has grown more complicated to be managed. In order to...
In this paper, resource allocation (RA) problem in heterogeneous Software Defined Network (SDN) with infrastructure sharing platform among multiple network service providers (NSPs) is studied. The considered problem is modeled as a reverse combinatorial auction (R-CA) game, which takes competitiveness and fairness of different NSPs into account. The heterogeneous RA associated with personal QoS requirement...
We study the uplink multi-user multiple-input multiple-output (UL MU-MIMO) channel in a wireless local area network (WLAN) with multiple access points (APs) and multiple stations (STAs). APs are allocated with different orthogonal frequency-division multiplexing (OFDM) subcarriers. Each AP has multiple antennas and applies zero-forcing successive interference cancellation (ZF-SIC) as in [1] for spatial...
In this paper, we facilitate device-to-device (D2D) communications to provide relay assistance to cell-edge user equipments (UEs) with the objective of improving system throughput. We first formulate a joint problem of relay node selection which helps cell-edge UEs find the proper relay nodes, as well as spectrum allocation for D2D links to maximize the system throughput with interference constraints...
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