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In this work, we study a practical resource allocation (RA) scheme that considers heterogeneous services in OFDMA femtocell networks. Heterogeneous services include guarantees of the minimum data-rate for delay-sensitive (DS) users and the fairness for delay-tolerant (DT) users. The RA problem is formulated to maximize the total throughput of all femtocells while satisfying the constraints of cross-tier...
Device-to-Device (D2D) communications can increase the spectral efficiency of future cellular networks when sharing part of the cellular spectrum. Radio resource allocation mechanisms are then necessary to control the interference that D2D and cellular transmissions can generate to each other. Most of the existing allocation schemes rely on the knowledge of the channel gain of all possible links between...
We study the resource allocation problem in RAN-level integrated HetNets. This emerging HetNets paradigm allows for dynamic traffic splitting across radio access technologies for each client, and then for aggregating the traffic inside the network to improve the overall resource utilization. We focus on the max-min fair service rate allocation across the clients, and study the properties of the optimal...
Downlink non-orthogonal multiple access (NOMA), where users are paired as user set and multiplexed in the power domain, is a promising technology for fifth generation (5G) communication system. This paper studies joint optimization of user pairing and power allocation to maximize generalized proportional fair metric subject to transmit power constraints. This problem can be divided into two parts:...
This paper considers an orthogonal frequency division multiplexing (OFDM) based two-way cognitive radio (CR) multiuser multiple relay network. The target is to jointly solve the problem of power allocation, subcarrier assignment, selection of best relay/s, and the sub-carrier pairing at the relay nodes. The aim of the optimization is to maximize the end-to-end sum rate of the network under exclusive...
In this study, a Long Term Evolution Advanced (LTEa) — based multi-user Orthogonal Frequency Division Multiple Access (OFDMA) heterogeneous network has been simulated and a resource allocation strategy has been proposed. The strategy under consideration can inherently mitigate electromagnetic interference, hence increases the mean number of terminals, and requires no channel state information (CSI)...
Self-backhaul is flexible and cost efficient for ultra dense network (UDN) since it provides backhaul using the same wireless technology as access link. Content prediction and caching can lower the load on backhaul and improve user experience. Therefore, an algorithm named tri-stage fairness (TSF) is proposed to solve the resource allocation problem in UDN with self-backhaul and caching, in which...
We consider the problem of scheduling VMs (Virtual Machines) in a multi-server system motivated by cloud computing applications. VMs arrive dynamically over time and require various amounts of resources (e.g., CPU, Memory, Storage, etc.) for the duration of their service. When a VM arrives, it is queued and later served by one of the servers that has sufficient remaining capacity to serve it. The...
For the next-generation mobile communication system, enlarging the system capacity by allowing the use of non-orthogonal user multiplexing has been suggested. In a downlink multicarrier non-orthogonal multiple access (NOMA) system, single or multiple users are allocated to each subband. In NOMA scheduling, a proportional fair (PF) algorithm, where users with few allocated resources are selected on...
The goal of the present study is to evaluate the Bit Error Rate (BER) of a MIMO-OFDMA multicellular network, when the Regional Anti-Jamming Subcarrier Scavenging (RAJSS) strategy is employed. Throughput and power consumption per mobile terminal (MT) are provided as output metrics, and compared to other subcarrier allocation strategies. The system platform, which is compatible with all studied strategies,...
Device-to-Device (i.e. D2D) communication technology not only magnify system capacity but also utilizes the gain of physical proximity of communicating devices to support services like proximity services, traffic offloading etc. from eNB (i.e. evolved Node-B). D2D communication enhanced resource efficiency and brought down traffic load from eNB in LTE-A networks. Coexistence of D2D users and conventional...
In broadband indoor power line communication (PLC) sys tems, multiple input multiple output (MIMO) techniques have been introduced to address the increasing demand for high data rates under the constraint of limited allocated bandwidth. Whereas the self inter-antenna interference can be dealt with on each subcarrier, both inter-carrier and inter-symbol interference can occur yielding sub-optimal bit...
This paper proposes a dual-connectivity (DC) profile allocation algorithm, in which a central macro base station (MBS) is underlaid with randomly scattered small base stations (SBSs), operating on different carrier frequencies. We introduce two dual-connectivity profiles and the differences among them. We utilize the characteristics of dual-connectivity and their scenarios to reduce the feasible combination...
In this paper, we propose Floating Band D2D, an adaptive framework to exploit the full potential of Device-to-Device (D2D) transmission modes. We show that inband and outband D2D modes exhibit different pros and cons in terms of complexity, interference, and spectral efficiency. Moreover, none of these modes is suitable as a one-size-fits-all solution for today's cellular networks, due to diverse...
The increasing demand for data traffic through high capability mobile devices and the trade-off between revenues and costs for upgrading the communication infrastructures strongly push the network operators to make the best use of the available network resources, which renews and reinforces the interest on resource management strategies. In this respect, a key challenge consists in finding a proper...
This paper investigates power allocation for reliable downlink transmission in cellular networks subject to quality-of-service (QoS) constraints. The reliability of data transmissions is assured by hybrid automatic repeat request protocol with incremental redundancy (HARQ-IR). By evaluating the effective throughput of the HARQ-IR protocol for the downlink transmission under QoS constraints, we propose...
This work considers to advance the use of radio resources in a wireless network, for two ways communications based on multiple relays by using a maximum weighted bipartite technique in OFDM depended network. The main idea is to make best use of the system by advancing the total throughput of the system. By pairing the best relay and sub carrier between the several pairs of users and improve the throughput...
In relay assisted wireless communications, the multi-source, single relay and single destination system (an M-1-1 system) has garnered significant interest, due to the increased demand for higher network throughput and connectivity. Previously, power allocation at the relay in M-1-1 systems have assumed availability of instantaneous channel state information (CSI), which is rather idealistic. In this...
The main challenge of LTE networks is to use unitary frequency reuse factor to achieve highest possible data throughput, however it leads to a severe interference affecting active users. Several interference mitigation techniques focus on bandwidth partitioning methods to avoid cell edge interference, although they improve user's average SINR, such techniques reduce maximum achievable data rate. In...
In this paper, we investigate a joint subcarrier- relay assignment and power allocation scheme for amplify-and- forward (AF) based two-way multi-relay networks. We formulate a sumrate maximization optimization problem with individual power constraints on each node. The target is to seek a unified optimalscheme for subcarrier-relay assignment and power allocation. The problem turns out a mixed integer...
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