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The demand for wireless communication in enterprise network has been increasing with the advent of "smart working environment." In enterprise wireless network, high density of access points (APs) and limited frequency resources raise the significance of radio resource management. In this paper, we propose a centralized algorithm, named JACPoT, for jointly executable transmission power control...
Non-orthogonal multiple access (NOMA) with successive interference cancellation (SIC), is considered as a candidate multi-user access scheme for 5G cellular systems. In this paper, we provide theoretical insights and solution algorithm for optimizing multi- user power and channel allocation in NOMA systems. We mathematically formulate the NOMA resource allocation problem and prove its NP-hardness...
Network virtualization (NV) is a promising solution for higher resource utilization, improved system performance, and lower investment capitals for network operators. Spectrum sharing is an important issue for NV in the wireless networks. Meanwhile, the scheme of Almost Blank Subframe (ABS) causes new challenge for NV in the heterogeneous cellular networks (HetNet). This paper aims at investigating...
Coordinated multipoint (CoMP) transmission is widely recognized as a promising technique for inter-cell interference (ICI) mitigation. Because both the signal processing complexity and the inter-cell data exchanging overhead required by CoMP are limited in practical applications, cooperative clusters which consist of a limited number of base stations (BSs) need to be formed so as to mitigate the interference...
Dense deployment of femtocell networks in local area is an evolutional trend of cellular networks due to the exponential increasement of traffic demand. In the dense deployment scenario where radio spectrum becomes a resource bottleneck due to its scarcity, dynamic, scalable and self-configured spectrum allocation schemes are of substantial importance. Meanwhile, quality of service (QoS) is always...
In cellular networks, proximity users may communicate directly without going through the infrastructure such as the base station (BS), which is device-to-device (D2D) communications, and it can improve spectral efficiency. However, enabling D2D communications in a cellular network poses two major challenges. First, the BS is suffered from signaling overhead. Second, D2D transmitters may cause harmful...
Spectrum auctions, which allow a spectrum owner to sell licenses for signal transmission over specific bands, can allocate scarce spectrum resources quickly to the users that value them most and have received a great deal of research attention in recent years. While enabling reusability-driven spectrum allocation, truthful spectrum auction designs are also expected to provide price fairness for homogeneous...
In this paper, we study a resource allocation scheme for downlink orthogonal frequency division multiplexing (OFDM) cognitive radio networks (CRNs) in which the cognitive base station (BS) is equipped with multiple antennas. The multiple description coding multicast (MDCM) model and beamforming technique are employed to maximize the total received rate of all cognitive radio (CR) users with the constraint...
Relaying is considered in LTE-A networks as a promising solution to increase the capacity and improve the coverage. Resource sharing among different nodes and links and inter-cell interference coordination (ICIC) are challenging issues to obtain a real performance gain linked to relay deployments. This paper focuses on Type 1 half-duplex inband relaying. We propose a dynamic resource allocation (RA)...
With increasingly popular services containing asymmetric uplink (UL) and downlink (DL) traffic, Time-Division Duplexing (TDD) shows more advantages than Frequency-Division Duplexing (FDD) in wireless cellular networks due to its flexibility of dynamic UL/DL configuration. A major technical challenge in TDD is how to optimize the UL/DL switching point for each individual cell to meet its asymmetric...
Recently, cognitive radio has been proposed to improved the spectrum resource utilization efficiency. The secondary users (SUs) are allowed to sense, detect and access the frequency bands that are not currently being in use by primary users (PUs). In fact, SUs always have no knowledge about PUs' exact communication mechanism. In order to guarantee PUs' communication quality of service (QoS) and satisfy...
In multiple hops network, there would be competition among the Peer to Peer (P2P) links when the amount of the P2P links was large. This paper proposed a novel dynamic channel allocation (DCA) algorithm based on ant colony intelligence (ACI) to solve the problem of multi-hop network competition among the P2P links. Theory analysis showed than the shorter of the average length of the routes of the...
In this paper, we consider the multicast beamforming problem in a downlink wireless system. Then, an optimization problem is formulated to find the optimal user-group assignment scheme and beamforming weight vectors, such that the number of admitted users is maximized with the minimum transmit power under the quality of service (QoS) requirement constraints of each individual user. Unfortunately,...
Due to the exploded demand for mobile traffic and diverse service type, flexible mobile networks with high capacity is drawing lots of research efforts. Distributed large scale (DLS) MIMO has superiority over centralized large scale MIMO and separated small cells due to lower signal loss to users and central control. In this paper, we present a self-optimization method for Cloud RAN based DLS MIMO...
Typically, mobile users cluster around points of interest in dense urban environments such as city centers forming so-called data traffic hot spots and hot zones. To provide capacity to such users efficiently, mobile operators deploy small cells. However, the deployment of heterogeneous networks, which consist of overlaying macro cells and many co-channel small cells, entails many problems. One typical...
Under the wireless communication network environment, the received signal will be effected by noise and interference. And it will produce many inaccurate codes consequentially. Under this situation, the error bits in the binary data after demodulating and decoding will affect the formats extraction of the unknown protocols. In order to improve the accuracy under the noise interference and the adaptability...
The use of orthogonal frequency division multiple access (OFDMA) in Long Term Evolution (LTE) and LTE- Advanced systems facilitates the potential for scheduling cell users on orthogonal time-frequency resource blocks selectively. This paper identifies several frequency selective scheduling (FSS) algorithms and studies their performance and optimality under certain identified constraints in practice...
In a multi-cell wireless network, users require to be properly assigned to base-stations. After assigning the base-stations to users, the power consumption and interference is controlled by means of a distributed power control algorithm. The power control and base station assignment is a challenging issue which should be jointly addressed. The conventional target-SINR tracking power control algorithm...
In addition to the advantage of high capacity in conventional multiple input multiple output (MIMO) systems, distributed large scale (DLS) MIMO systems can further enhance energy efficiency and the system performance at the cell edge. Key challenges in DLS-MIMO systems include interference mitigation and complex signal processing in a large number of antennas. Thus, the concept of antenna clustering...
Radio network deployment and coverage optimization are critical to next-generation wireless networks. In this paper, the problem of optimally deciding on whether to install additional small cells or to upgrade current macrocell base stations (BSs) with massive antenna arrays is studied. This integrated deployment problem is cast as a general integer optimization model by using the facility location...
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