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Based on IEEE 802.15.4, a contention-free period (CFP) adopts guarantee time slot (GTS) mechanism to ensure each device can access the radio channel. However, it is hard to get the authority to access the radio channel due to more competitors access the radio channel simultaneously. To cope with this issue, we proposed a guarantee time slot mechanism to enhance the performance and utilization of using...
A new quality of service (QoS) enhancement scheme for IEEE 802.11e Enhanced Distributed Channel Access (EDCA) protocol is developed. It uses a combination of an adaptive access category (AC) traffic allocation, incorporated into the network's wireless side, and weighted round robin (WRR) queuing scheduling mechanism, incorporated into the wired side of the network. The adaptive traffic allocation...
We present an analytical model for a random resource allocation and scheduling scheme for non-real-time polling service (nrtPS) traffic in IEEE 802.16e network. We adopt two system assumptions; unsaturation condition for the queue of each mobile station, and random amount of resources in a frame for each nrt-PS traffic, which are realistic for practical network systems. By jointly considering the...
Traditionally, event centric Wireless Sensor Network (WSN) applications treat all events with equal importance, implicitly assuming that all events have same priority. However, in real world applications events may have different level of severity and sensitivity based on their cost of potential damage, occurrence location and frequency. Such applications demand that a detection scheme adopt differentiated...
Resource allocation play an important role in service composition for cloud-based video surveillance platform. In this platform, the utilization of computational resources is managed through accessing various services from Virtual Machine (VM) resources. A single service accessed from VMs running inside such a cloud platform may not cater the application demands of all surveillance users. Services...
To make the plan and scheduling of aircraft deicing resources in large airports, this paper analyzes the operation and problems of aircraft de-icing, and the cooperative game-theoretic analysis method is adopted for the solution of deicing delay that based on the aircraft ground deicing process coalition modeling in this paper. Finally, the Repast software is used for constructing above multi-agent...
Routing for Delay Tolerant Networks (DTNs) are challengeable for the continuously varied network environment. Most of existing DTN routing algorithms mainly focus on metrics such as delay, hop count and bandwidth, etc. Green communication is a new focus with the goal of saving energy by optimizing network performance and ultimately protecting the natural climate. In this paper, we present an Energy-efficient...
As the size and complexity of embedded systems are growing, the area cost and performance of the LSI circuits are becoming more crucial. A critical bottleneck for them is interconnections such as multiplexers (MUXs). Thus, a hardware synthesis technique for reducing MUXs, especially during the earlier design phase, has been demanded. This paper presents a novel MUX reduction technique in high-level...
Joint congestion control and scheduling has been widely applied to resource allocation in multi-hop wireless networks. Existing algorithms usually rely on seamless cooperation between network components to seek the optimal solution. However, this is unrealistic considering the presence of time delay and channel capacity perturbation in real wireless environments. The stability and efficiency of these...
The optimal allocation of Communication-Intensive Applications is a well-know complex issue in Clouds. This kind of applications, due to the strong impact of communications on their performance, requires not only that their tasks are allocated on resources able to satisfy their computational requirements but also that the distance among these resources, in terms of communication delay or latency,...
The heavy tailed nature in dynamic spectrum networks challenges the applicability of conventional network stability criterions. To encounter this, a new stability criterion, namely moment stability, is introduced, which requires that the queue length of each secondary user has finite moments for every achievable order. Then, the necessary and sufficient conditions for the existence of a resource allocation...
Network resources are often limited, so how to use them efficiently is an issue that arises in many important scenarios. Many recent proposals rely on a central controller to carefully orchestrate resources across multiple network locations. The central controller gathers network information and relative levels of usage of different resources and calculates optimized task allocation arrangements to...
In this paper, we present an approach to bounded optimal planning and flexible execution for a robot team performing a set of spatially distributed tasks related by temporal ordering constraints such as precedence or synchronization. Furthermore, the manner in which the temporal constraints are satisfied impacts the overall utility of the team, due to the existence of both routing and delay costs...
Multimedia communications over Wireless Local Area Networks like hotspots, are a challenging issue due to the best-effort nature of Internet communications. In a previous work we introduced a Dual-Queue Rate-Controlled mechanism for Access Points (DRAP) in a Hotspot scenario. DRAP has shown to provide some Quality of Service (QoS) guarantees to audio and video traffic flows in the presence of TCP...
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...
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