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Wireless sensor networks (WSNs) are used in many mission-critical applications, such as target tracking on a battlefield, emergency alarms, and disaster detection. In such applications, QoS provisioning in the timeliness domain is indispensable. Moreover, because of the diversity of sensory data, QoS provisioning should support not only one but multiple levels of end-to-end delay constraints. As a...
Device-to-Device (D2D) communications have been already playing a relevant role in 3GPP for several releases of the LTE standard. This paper first shortly introduces how D2D was brought into 3GPP standards and how it evolved, starting from direct discovery and communication between devices being specified in Release 12, through UE-to-Network relaying feature introduction in Release 13, up to vehicle-to-vehicle...
Machine-to-machine (M2M) communications consist of a large number of smart devices that communicate automatically without human intervention. The Third-Generation Partnership Project (3GPP) Long-Term Evolution (LTE) and LTE-Advanced (LTE-A), due to some features such as IP connectivity and scalability, are ready-to-use infrastructures for the M2M communications implementation. In the next generation...
In this paper, transmission over buffer-aided diamond relay systems under statistical quality of service (QoS) constraints is studied. The statistical QoS constraints are imposed as limitations on delay violation probabilities. In the absence of channel state information (CSI) at the transmitter, truncated hybrid automatic repeat request-incremental redundancy (HARQ-IR) is incorporated to make better...
The use of small and miniature unmanned aerial vehicles (UAVs) for remote sensing and surveillance applications has become increasingly popular in the last two decades. The intermittent connectivity in a sparse UAV network makes it challenging to efficiently gather sensed image data. This paper investigates the communication of sensed images from a set of mobile survey UAVs to a static base station...
In order to improve the delay quality-of-service aware throughput performance of the optical wireless communications, a joint power allocation and relay selection scheme is proposed for a relay assisted multichannel coherent optical wireless communication system. The proposed joint power allocation and relay selection scheme provides the delay aware quality-of-service guarantee by maximizing the end-to-end...
Routing algorithms for cognitive radio networks should consider various objectives and constraints. Constraint-based routing (CBR) algorithms select a route satisfying constraints that are either administrative-oriented (policy routing), or service-oriented (QoS routing). In cognitive radio networks, a primary user's interference constraint is the most important objective for the activities of secondary...
In this paper, we investigate the joint resource allocation policy for an orthogonal frequency division multiplexing (OFDM)-based cooperative cognitive radio network with statistical delay quality of service (QoS) guarantees. In the CR network, the spectrum leasing scheme operates in a situation where the primary users (PUs) lease part of its licensed spectrum to the secondary users (SUs) in exchange...
The 3GPP Long Term Evolution Advanced (LTE-A) standard specifies a set of pioneer features such as relay nodes and carrier aggregation. At the same time, the Software Defined Networks (SDN) have become an emerging technology which provides centralized control and programmability to modern networks. In the current communication environment, cloud computing could combine the advantages of both technologies...
In order to improve the energy efficiency of the optical wireless communications, a joint power allocation and relay selection scheme is proposed for a relay assisted non-line-of-sight optical wireless communication system employing coherent detection with a dual optical channel multiplexing technique. The proposed joint power allocation and relay selection scheme aims to improve energy efficiency...
We study the problem of optimizing the performance of cognitive radio users with opportunistic real-time applications subject to primary users quality-of-service (QoS) constraints. Two constrained optimization problems are formulated; the first problem is maximizing the secondary user throughput while the second problem is minimizing the secondary user average delay, subject to a common constraint...
We consider a cognitive radio system that consists of primary user, secondary user, and their destinations. The secondary user has a relaying capability, i.e., it transmits the relayed packets from the primary user. Unlike most of the previous works that restrict the secondary user to transmit only in the idle time slots, we assume that the secondary user interferes on the primary user with certain...
In recent years, the usage of data is more than available resources. Due to fast growing requirements and development of the green communication technology may lead to go for many energy saving designs in networks, the faster growing network is LTE(4G), which is going to give more traffic, because of the user requirements, so the issues in the mobile networks are (1) traffic in networks (2) more energy...
The benefits of network layer cooperation cognitiveradio networks have been gradually recognized in recent years. In this paper we consider the network layer cooperation incognitive radio network, whereby primary users select somesecondary users to relay packets, in return for more favourablespectrum access rules for secondary users. Under this cooperationscheme, we investigate how to enlarge the...
This paper proposes Road-Side Units PlacementAlgorithm (RPA) to provide vehicles with the multihop Qualityof-service (QoS) data delivery in vehicular networks using infrastructurenodes, such as road-side units (RSUs) and relay nodes. We consider inbound delivery from RSU to vehicle. We definethe QoS of data delivery with the mean and standard deviationof end-to-end data delivery delay. In this paper,...
The past studies on router node placement for wireless mesh networks (WMNs) did not consider placement of Internet gateways. Therefore, mesh routers and mesh clients can only communicate locally. The problem in this paper is to maximize both network connectivity and client coverage for the router node placement in WMNs consisting of mesh routers, mesh clients, and Internet gateways, subject to three...
This paper considers a buffer-aided full-duplex (FD) relaying network assuming imperfect self-interference (SI) cancellation. The residual SI level is modeled to be proportional to the relay transmit power. Moreover, for quality-of-service (QoS) provisioning, the end-to-end queue-length is statistically constrained in terms of maximum acceptable outage probability. We derive the optimal power allocation...
In this paper, we evaluate the saturation throughput and saturation delay with direct/cooperative transmission strategies. Moreover, the cost function is introduced to tradeoff the system performance to determine the optimal strategy for adopting the cooperative transmission, and then we extend the model to support applications with quality of service (QoS) requirements. In order to improve the efficiency,...
In this work, the performance of two-hop wireless systems under statistical queueing \emph{end-to-end} delay constraints is investigated. In the two-hop links, it is assumed that there is no direct link between the source and destination. The communication between the source and destination is accomplished via an intermediate full-duplex relay node, which forwards the information to the destination...
This work considers the relay selection and resource allocation problem (i.e., link scheduling, and rate allocation) for multi-source, multi-relay dual-hop wireless networks. The relays employ buffers to store the received data from the sources for future transmissions. End-to-end (E2E) delay of each traffic flow originated from a source or a relay is constrained in terms of maximum allowable delay-outage...
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