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Reliable service provisioning is crucial to the public safety (PS) communications especially when network outage happens. Isolated E-UTRAN operation, introduced in LTE Release 13, is able to host separate core network functions at the base stations (BSs) to provide limited set of services to the users. However, a significant issue remains to be solved is to coordinate among BSs to create an autonomous...
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...
Distributed, networked communication systems, such as relay beamforming networks are typically designed without considering how the positions of the respective nodes might affect the quality of the communication. That is, network nodes are either assumed to be stationary in space, or, if some of them are moving while communicating, their trajectories are assumed to be independent of the respective...
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...
Due to the expected exponential growth of traffic volume in 5G-based networks, efficient mechanisms that effectively utilize the underutilized portion of wireless spectrum are needed. Opportunistic spectrum access mechanisms are designed to utilize the available licensed spectrum bands, which can be granted to unlicensed users (secondary users (SUs)) without causing harmful interference to licensed...
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...
One important aspect that needs to be carefully considered in maritime operations using unmanned robotic vehicles is the communication restrictions between the vehicles and the mission controller that arises mainly due to long distances and/or low power transmissions. This paper addresses the problem of maintaining a communication link between a command station and an Unmanned Aerial Vehicle (UAV)...
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...
In this paper, we investigate the performance of a three-link relay system in the scope of radio access networks. The diversity decode-and-forward (DDF) mode and repetition coding are adopted due to the robustness and low complexity for small devices. On the other hand, signal transmissions are subject to mixed fading. The backhaul link is under the Rician fading, while the access link and direct...
This paper concerns the smart exploitation of multimodal communication capabilities of underwater nodes to enable reliable and swift underwater networking. To contrast adverse and highly varying channel conditions we define a smart framework enabling nodes to acquire knowledge on the quality of the communication to neighboring nodes over time. Following a model-based reinforcement learning approach,...
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...
Multi-hop communication is a spectral-efficient approach for connecting multiple pairs when direct links are absent or have insufficient strength. In this paper, we highlight the benefits of improper Gaussian signaling for a multi-pair full-duplex MIMO relay network in terms of power efficiency. By employing improper Gaussian transmission, the power minimization problem under rate constraints is intrinsically...
We consider a hybrid satellite-terrestrial spectrum sharing system wherein multiple terrestrial secondary networks coexist with a primary satellite network. We propose an amplify-and-forward based cooperative spectrum sharing protocol by employing an opportunistic secondary network selection (OSNS) scheme. The best secondary network is selected to minimize the outage probability of primary satellite...
Nowadays, cellular operators are facing new challenges to satisfy the future demand of their clients. In addition, user's mobility among multi-tier networks leads to dropping ongoing calls in the system. The introductions of low power nodes and Device-to-Device (D2D) communication into Macro cells are regarded as promising technologies to provide a high data rate. A new design known as Device-for-Device...
This paper investigates relay selection and subcarrier allocation in cooperative OFDMA systems where users with best-effort (BE) service and rate-constrained (RC) service coexist. We formulate the problem as a binary integer linear programming to maximize the network data rate with quality-of-service (QoS) requirements. A greedy algorithm is proposed for the degradation problem of only BE users and...
The necessity for a network to provide wireless multimedia services in various levels of quality of service (QoS) with maximizing the utilization of spectral resources. By joint relaying and relay selection we can allocate resources with adaptive resource scheduling. The enhanced coverage and capacity is achieved with the help of small cell deployment. The proposed joint relaying and scheduling strategy...
We address the problem of enhancing Quality-of-Service (QoS) in power constrained, mobile relay beamforming networks, by controlling the motion of the relaying nodes. We consider a time slotted system, where the relays update their positions before the beginning of each time slot. Adopting a spatiotemporal stochastic field model of the wireless channel, we propose a novel 2-stage stochastic programming...
In this paper, a win-win cooperative strategy is designed for two pairs of users, i.e., a primary user pair and a secondary user pair, competing resources in an orthogonal frequency division multiplexing (OFDM) network. The primary users aim to achieve given target rates with the help of a relay to overcome bad channel conditions, where one secondary user is selected as the relay to improve the overall...
In recent years, the increasing penetration of Distributed Energy Resources (DERs) has made an impact on the operation of the electric power systems. In the grid integration of DERs, data acquisition systems and communications infrastructure are crucial technologies to maintain system economic efficiency and reliability. Since most of these generators are relatively small, dedicated communications...
Regarding the bandwidth allocation of IEEE 802.16j two-hop relay networks, a Dynamic Bandwidth Allocation (DBA) algorithm based on the utility optimization is proposed. During the bandwidth allocation process of relay links, DBA algorithm takes the Quality-of-Service (QoS) requirements of different services into account by means of utility functions came from economic theories. Under the certain constraints,...
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