The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Heterogeneous networks constitute a promising solution to the emerging challenges of 5G networks. According to the specific network architecture, a macro-cell base station (MBS) shares the same spectral resources with a number of small cell base stations (SBSs), resulting in increased co-channel interference (CCI). The efficient management of CCI has been studied extensively in the literature and...
In this paper, we propose an auction-based spectrum allocation scheme in a multi-channel distributed cognitive radio network where primary users are the sellers and secondary users are the buyers. The SUs bid for the various channels that the primaries want to sell; however their bids based on the preference for the channels. We use the signal to interference and noise ratio (SINR) as a metric for...
Interference alignment (IA) has recently emerged as a promising interference mitigation technique for interference networks. In this paper, we focus on the IA non-iterative transceiver design problem in a multiple-input-multiple-output interfering broadcast channel (MIMO-IBC), and observed that there is previously unexploited flexibility in different permutations of user ordering. By choosing a good...
Multi-radio Multi-channel Wireless Networks (M2WNs) have been studied intensively over the past decade with focus on traffic management functionalities such as channel-to-interface assignment, traffic routing and scheduling. These developed solutions always assumed continuous normal operation of all network components while failing to take into consideration the failure-prone nature of wireless networks...
We instigate the questions of: (i) whether increasing the number of available channels is always useful for improving the Quality of Service (QoS) (i.e., throughput or packet delivering delay) of Wireless Mesh Networks (WMNs), (ii) whether using more complex algorithms for managing Partially Overlapping Channels (POCs) is beneficial in terms of improving the QoS of WMNs? For the purpose of the instigation,...
Multi-radio multi-channel (MRMC) is a promising approach to relieve the overload caused by the explosive growth of video streaming traffic in wireless mesh networks (WMNs). Previous studies have shown that in MRMC WMNs, network capacity can be increased significantly by proper design of channel assignment and routing algorithm. Multi-path routing can make good use of the network capacity improvement...
Convergecast, the process of data collection from set of sensor nodes and forwards to the sink node over a tree based topology is a fundamental traffic pattern in Wireless Sensor Networks(WSN). Time Division Multiple Acess(TDMA) protocol is considered for scheduling, where time is divided into slots. The main aim of this paper is to reduce the number of time slots (scheduling length) using different...
A static channel assignment algorithm in multi-radio multi-channel WMN (Wireless Mesh Network) is proposed aiming to minimize the maximum link interference. The proposed algorithm is an approximation algorithm since the problem is NP-hard. We prove that the greedy channel assignment algorithm is a factor (2−1/k) algorithm, where k is the number of available orthogonal channels. Additionally, the greedy...
Heterogeneous cellular network has become an important network architecture to improve network capacity and spectral efficiency. This paper works on a theoretical framework for analyzing the system spectral efficiency in a heterogeneous network with different association schemes including best power and range expansion associations. Furthermore, a fractional frequency reuse scheme is applied to mitigate...
Next generation mobile networks will face the unprecedented demand for higher data rates. To satisfy this demand, the dense deployment of heterogeneous wireless networks (HetNets) is a promising solution. One of the major challenges in dense HetNets is to dynamically allocate the resources such as power and channel so that the energy efficiency and throughput of the network improve. One of the important...
Energy-efficient power allocation and wireless backhaul bandwidth allocation are studied for orthogonal frequency division multiple access heterogeneous small cell networks. Different from the existing resource allocation schemes that maximize the throughput, the studied scheme maximizes energy efficiency by allocating both transmit power of each small cell to users and bandwidth for backhauling,...
Underlaying device-to-device (D2D) communications to a cellular network is considered as a key technique to improve spectral efficiency in 5G networks. For such D2D systems, mode selection and resource allocation have been widely utilized for managing interference. However, previous works allowed at most one D2D link to access the same channel, while mode selection and resource allocation are typically...
Cognitive radio networks play a vital role in solving the problem of underutilization of spectrum by identifying unused licensed radio spectrum. They solve the problem by distributing this unused spectrum among unlicensed users in an intelligent fashion without interfering with existing users. In this paper, using the conflict graph and graph colouring concepts, a Graph Colouring based Dynamic Channel...
Device-to-Device (D2D) communication is an important component for 5G networks. Traditional D2D communications are mainly within the same cell. However, due to the reduced cell sizes, and the long communication range among mobile devices, the issues in D2D communication across cells have not yet been well addressed. In this paper, we first introduce an operation protocol to support cross-cell D2D...
Adjacent channel interference (ACI) is often not considered when spectrum sharing schemes are designed for cognitive radio networks (CRNs). In practice, it is necessary to avoid interference by deploying guard bands between two distinct receptions. However, using guard bands typically reduces spectrum efficiency. In this work, we study the impact of guard bands on spectrum efficiency under different...
As wireless networks continue to grow rapidly denser with the introduction of various wireless-enabled elements, signal interference coupled with limited radio spectrum availability emerges as a significant hindrance to network performance. In order to retain high network throughput, channels must be strategically assigned to nodes in a way that minimizes signal overlap between neighboring nodes....
In this paper, we present a novel guard-band (GB)-aware channel assignment mechanism that attempts at maximization the achieved network throughput by improving spectrum utilization. Unlike most of previously proposed GB-aware channel assignment algorithms that perform the assignment sequentially, the proposed mechanism performs the channel and power assignment for multiple cognitive radio (CR) transmissions...
Device-to-device (D2D) communication underlaid with cellular networks is a new paradigm, proposed to enhance the performance of cellular networks. By allowing a pair of D2D users to communicate directly and share the same spectral resources with the cellular users, D2D communication can achieve higher spectral efficiency, improve the energy efficiency, and lower the traffic delay. In this paper, we...
In this paper, we address the joint channel and power allocation problem for Device-to-Device (D2D) communications underlaying uplink cellular networks. We aim to maximize the sum-rate of D2D communications while fulfilling the QoS requirements for both cellular users (CUs) and D2D pairs (DUs). We first propose a heuristic channel assignment algorithm in which a cellular channel is allowed to be shared...
Cognitive Radio Networks (CRNs) are considered as a promising solution to the spectrum shortage problem in wireless communication. We model the network of secondary users (SUs) as an undirected potential graph PG = (V (PG),E(PG)), where v ∈ V (PG) correspond to a secondary user and each edge (u, v) ∈ E(PG) represents link between nodes u and v (nodes are in within the transmission range). Two nodes...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.