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Most of IoT applications include large number of distributed sensors which are interesting in specific geographical area. A large number of IoT entities have multiple relations and dynamic connections with each other. And there are many group communication requirements. Flexible multicast mechanism will be essential in such environments but it is difficult to satisfy verious requirements by means...
Conventional planning and optimization of cellular networks for supporting the peak-time user demand leads to substantial wastage of electrical energy. Therefore, we propose an energy-aware dynamic network provisioning framework for realizing green mobile cellular systems by reducing energy consumption in access networks. Proposed mechanism allows base stations (BSs) to offload their entire traffic...
According to the peak hours of the day, the number of sensed primary users (PUs) and also requesting secondary users (RSUs) will be dramatically increased. Since the radio spectrum is a limited resource, efficient spectrum management techniques on cognitive radio is necessary to manage all PUs, active secondary users (ASUs) and RSUs where all three types of the users have unknown activity ratios....
Reducing the energy consumed by wired computer networks is a challenge that has been actively investigated over the past few years. A popular mechanism proposed to reduce the consumption aims to put links and line cards to sleep mode during off-peak hours. Such a mechanism, however, decreases the available network capacity and increases the risk of congestion if traffic rises unexpectedly. This paper...
Energy efficiency and green communication have been a hot research topic in ICT industry recently. For cellular networks, the energy cost of base stations (BSs) makes a huge proportion of the total cost. This paper concentrates on finding an approach to shut down BSs with low traffic load from active mode to sleeping mode. QoE, instead of QoS, is guaranteed in this paper. Since different service types...
Cloud computing technology is gaining great popularity due to the utility-oriented information services that it offers worldwide. The pay-as-you-go elasticity of cloud computing technology allows hosting pervasive applications and this has become possible for various end-users such as consumers, and those in the scientific and business domains. Although cloud technology returns great benefits and...
With the rapid growth of mobile data traffic, operators are expected to densely deploy base stations to meet user demands. Recent researches have indicated that the densely deployed base stations lead to the significant increase of the operational expenses of operators due to the electricity bills to maintain their operation, and thus the profit of operators is greatly decreased. Different from the...
Since access networks are deployed to support peak traffic, part of base stations always keep active during off-peak period, resulting energy dissipation. In this paper, we propose a dynamic Base Station (BS) sleeping algorithm to reduce energy consumption, which exploits dynamic characteristics of mobile data traffic on time and spatial dimensions. Our novel approach aims to improve energy efficiency...
The access point sleeping scheme is an efficiency method for power saving in the cellular networks. This paper proposes a QoS-aware adaptive access point sleeping scheme designed for energy efficiency in the relay cellular networks. To achieve the best tradeoff between QoS guarantee of users and the power saving of the network, the optimization problem of the access point selection for each user is...
With enormous growth in the telecommunication industry, energy efficiency has become a critical issue. Base stations and the core network account for a large amount of energy consumption today. Traditional energy saving techniques switch some base stations off completely during light loads to save energy. This creates problems for the backhaul network and also for quickly returning to full capacity...
The paper describes a service model for cost-effective event reporting to clients over a wide-area network. The service provider (SP) maintains multiple protocol mechanisms to replicate the event pages at different proxy nodes of the distribution network. The mechanisms, which embody server-driven and client-driven replica update schemes to synchronize the page copies, reduce the access latency on...
Service selection, where some of the services are accessed indirectly as constituents of composite services, is difficult for the following reasons: (1) the interpretation of service qualities is subjective; (2) evidence must be combined from multiple sources; (3) service profiles change dynamically; and (4) constituent services may be only partially observable behind composite services. We propose...
The development of cloud technologies allows the implementation of scalable, versatile, and customized systems, constructed on-demand. This allows more efficient use of computing resources, improving the revenue of the system and enhancing the Quality of Service (QoS) received by users while minimizing the power consumption of the machines. Several research works conclude that in order to efficiently...
Switch is the kernel of Avionics Full Duplex Switched Ethernet (AFDX) network, and its scheduling algorithm affects the switch's performance directly. Employing the Earliest Deadline First (EDF) scheduling method in the switch of AFDX network can overcome the disadvantages of Quality of Service (QoS) for emergent messages. EDF scheduling algorithm assigns a priority level for each arriving message,...
An event-based online policy iteration algorithm is presented for addressing hierarchical optimization problems. First, an event-driven analytical model with dynamic hierarchy called semi-Markov switching state-space control processes is introduced. Then, by exploiting the structure of dynamic hierarchy and the features of event-driven policy, an online adaptive optimization algorithm that combines...
According to several studies, the power consumption of the Internet accounts for up to 10% of the worldwide energy consumption, and several initiatives are being put into place to reduce the power consumption of the ICT sector in general. To this goal, we propose a novel approach to switch off network nodes and links while still guaranteeing full connectivity and maximum link utilization. After showing...
This paper proposes a novel dynamic bandwidth allocation method based on a new switch technology named Ethernet-oriented physical frame timeslot switching (EPFTS). Based on the features of EPFTS, the bandwidth allocation is changed to quota allocation for manageable quality of service (QoS). The proposed method is composed of a quota allocation strategy and a dynamic quota scheduling policy called...
Application server clusters are often used to service high-throughput web applications. In order to host more than a single application, an organisation will usually procure a separate cluster for each application. Over time the utilisation of the clusters will vary, leading to variation in the response times experienced by users of the applications. Techniques that statically assign servers to each...
As currently specified by 3GPP, MBMS (multimedia broadcast multicast service) content can be provided in a cell by either point-to-point (P-t-P) or point-to-multipoint (P-t-M) transmission mode, but not both at the same time. In earlier work we highlighted the deficiencies of the current approach and proposed the concept of the ldquodual transmission mode cellrdquo, in which P-t-P (DCH) and P-t-M...
In mobile networks a most economic utilization of the channels on the air interface by means of intelligent radio resource management is desired since these resources are the most valuable ones. Half-rate speech codecs introduced in GERAN networks for capacity increase involve quality degradation compared to full-rate codecs especially in error-prone radio channel conditions. To provide best possible...
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