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Industrial communication often has to work in an environment where other networks or radiation create different levels of interference for the data traffic. Additionally, industrial applications often demand predictable real-time performance of the network. One way of trying to utilise the available frequencies in an effective manner is to include cognitive functionality in the network. We present...
The routing problem of wireless data networks depends on the link capacities which, in turn, are determined by the allocation of communication resources (such as power, frequency, and time slots) to the links. Therefore the optimal performance of the wireless network can be achieved by simultaneous optimization of routing and resource allocation. In this paper, we study a distributed algorithm for...
The introduction of a market-based balancing system can be particularly complex in those countries where the spot market is not transparent or does not provide sufficient liquidity for the Transmission System Operator's flexibility needs. This is indeed the case for Italy: this paper provides an experimental analysis of the balancing market to be launched in Italy within the outlined framework. Through...
When airport arrival slots are scheduled in excess of the available capacity, the scheduled flights are assigned slots by a rationing scheme. The traditional approach is to ration slots by schedule (RBS) on a first-scheduled/first-assigned basis. This approach, although meeting equity criteria, can result in inefficient use of the arrival slots in terms of passenger throughput and fuel burn; however,...
Cellular networks are currently facing significant challenges as mobile Internet access adoption continues to grow over the subscriber base. The challenge that network operators are facing is that Internet data traffic consumes considerably more resources than voice calls, necessitating in that respect significant capacity enhancements. Further, this rise in system utilization has caused a considerable...
Coordinated Multi-Point (CoMP) transmission schemes can provide large spectral efficiency gains in cellular networks. Because of the coordination among neighbor basestations, the planning interval for resource allocation with CoMP is longer than for uncoordinated local transmission modes. Especially for bursty data traffic, this planning interval might be too long to keep up with changes in offered...
This study addresses the resource allocation problem for multi-user MIMO systems with consideration of real-time services. Specifically, we focused on the delay constraints modeling in this paper, since it is a fundamental QoS requirement for all real-time services. To simultaneously meet the delay constraints of all users, we first modeled this resource allocation problem with specific delay restrictions...
Industrial wireless sensor network design requires efficient channel usages and timeslot assignment. In this paper, we describe an integrated channel-timeslot allocation algorithm based on a routing-tree coloring scheme. According to a strict routing-tree definition and corresponding resource allocation principles, the algorithm performs in two phases. In the first phase, a traditional mesh sensor...
Long Term Evolution (LTE) has been proposed as a promising radio access technology to bring higher peak data rates and better spectral efficiency. However, scheduling and resource allocation in LTE still face huge design challenges due to their complexity. This paper divides the complex problem into three sub-problems: scheduling pattern, scheduling priority and quantity of scheduled data. Based on...
LTE standard defines strict requirements for service classes in order to provide end users with exceptional QoS characteristics including fast connectivity and high data rates. However there is no standard scheduling algorithm defined for LTE and the task of protecting end user satisfaction while maintaining service class restrictions is left upon the service provider and currently is an open issue...
We present a server selection and admission control algorithm for IPTV networks that uses available bandwidth estimation to assess bandwidth available on the path from an end-user point of attachment to one or more IPTV content servers and that employs a revenue maximising admission decision process that prioritizes requests for high revenue content item types over requests for lower revenue item...
The emergence of state-of-the-art OFDMA-based wireless standards paved the way to new services with bi-directional requirements. In this paper, we present a probabilistic channel-aware, queue-aware and service-aware joint uplink/ downlink resource allocation scheme. The approach consists of coupling the queue behavior probabilistically by minimizing the divergence between the queue distribution at...
Successful implementation of NextGen will require a critical mass of aircraft to be equipped with a range of avionics in the areas of communication, navigation, and surveillance. The equipage process has faced impediments that have slowed equipage rates below targets. It is believed that a package of financial and operational incentives can help accelerate the equipage process by incentivizing and...
As the number of frequency domains aggressively grows in today's SOCs, the delivery of high delay test quality across numerous frequency domains while meeting test budgets is crucial. This goal necessitates not only the consideration of fault coverage but also the distinct characteristics of each domain such as frequency and the distribution of path lengths and, additionally, the delay test quality...
Device-to-Device (D2D) communication underlaying cellular network is considered to be a promising resource reuse technique, and it is basically developed for lots of local services. Considering the differences of the quality of services (QoS) between cellular and D2D users, the resource allocation scheme for D2D should flexibly allocate resource for D2D, rather than limiting one D2D user to share...
Load Balancing is typically used in cellular wireless networks in the frequency domain to balance paging, access, and traffic load across the available bandwidth. In this paper we extend the concept of Load Balancing to the Spatial domain. We develop two approaches — Network Load Balancing and Single-Carrier MultiLink — for Spatial Load Balancing. While these techniques are applicable to both cellular...
Featuring massive number of devices, Machine Type Communications (MTC) poses great challenges for radio access network (RAN) with its overloading problem that has been aggressively addressed by 3GPP as an essential working item. In this article, we first introduce random access procedure in LTE-A. Then we address the issue of RACH overload coming from massive number of MTC devices. To resolve RAN...
In this continuous fast world of mobile devices there is always a growing demand of high rate services. So a call has to be continuous with same data rates during a handoff. This paper deals with a novel approach DBA-CAC to reduce the call dropping probability while ensuring QoS demands are met in LTE wireless networks. The reduction is based on Adaptive Call Admission Control (Ad-CAC) scheme which...
Deploying roadside access points (APs) or an infrastructure can improve data delivery. Our empirical results from real trace driven simulations show that deploying APs produces up to 5× performance gain in delivery ratio and reduces delivery delay by as much as 35% with simple routing. However, we also find that buffer resources at the APs become a critical factor and poor buffer allocation leads...
In this paper, we study the three-node Gaussian relay channel with decode-and-forward (DF) relaying, in which the source and relay nodes transmit with power drawn from energy-harvesting sources. Assuming a deterministic energy-harvesting model under which the energy arrival time and the harvested amount are known prior to transmission, the throughput maximization problem over a finite horizon of N...
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