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constrained-markov-decision-process
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Optimal relaying in a slotted aloha wireless network with energy harvesting nodes
, Article IEEE Journal on Selected Areas in Communications ; Volume 33, Issue 8 , 2015 , Pages 1680-1692 ; 07338716 (ISSN) ; Ashtiani, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
In this paper, we derive optimal policies for cooperation of a wireless node in relaying the packets of a source node, in a random access environment. In our scenario, the source node sends its packets by its harvested energy and the relay node exploits its harvested energy in relaying the source packets not detected successfully at the destination. The relaying policies determine whether the relay node accepts or rejects the unsuccessfully transmitted source packets and how the relay node prioritizes the accepted source packets to its own packets. The optimization goal is to minimize the average transmission delay of source packets with and without a constraint on the average transmission...
Opportunistic RF Energy Harvesting in Cognitive Radio Networks
, M.Sc. Thesis Sharif University of Technology ; Nasiri-kenari, Masoumeh (Supervisor) ; Ashtiani, Farid (Supervisor)
Abstract
Considering energy efficiency ways a key role in designing future wireless networks( 5G mobile networks). Moreover Spectrum efficiency is another critical issues in designing wireless networks. Cognitive radios can improve the spectrum efficiency. On the other hand, radio frequency (RF) energy harvesting has emerged as a promising technique to supply energy for wireless networks and thereby increase their energy efficiency. In this thesis, we propose a new technique for the RF-powered CRNs.To this end,We consider a cognitive radio network comprised of a primary user and a secondary user. The primary user, uses a typical frequency band for transmit data in a time slot basis and both the...
Markov Decision Process with Timeconsuming Transition
, M.Sc. Thesis Sharif University of Technology ; Alishahi, Kasra (Supervisor)
Abstract
Mankind according to his authority (or delusion of authority) always finds himself in a situation which need decision-¬making. Usually, he seeks to make the best possible decision. The basis for measuring the goodness of choices is different in different occasions. This measure could be level of enjoyment, economic profit, probability of reaching a goal, etc. These decisions have consequences such that the situations before and after the decisions are not the same. Most challenging decision¬-making situations are those which the decision¬maker has not the complete authority over the situation and the results of decisions are influenced by out of control factors. A significant part of...
On tradeoff between collision and cooperation in a random access wireless network with energy harvesting nodes
, Article IEEE Transactions on Vehicular Technology ; Volume 67, Issue 3 , 2018 , Pages 2501-2513 ; 00189545 (ISSN) ; Ashtiani, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
In this paper, we investigate an energy harvesting cooperative network in which the cooperation is done in a random access environment. Although the cooperation provides an extra harvested energy supply for transmissions of the source, it causes probable collisions for the transmitted source packets. Thus, this kind of cooperation can improve or degrade the QoS of the source packets. We find the optimal policy in such a scenario to maximize the source throughput and derive the necessary and sufficient condition for no-cooperation policy to be throughput-optimal. Then, we prove that the maximum throughput is obtained by considering no-cooperation or full-cooperation policy depending on the...
On Coordination of Smart Grid and Cooperative Cloud Providers
, Article IEEE Systems Journal ; Volume 15, Issue 1 , 2021 , Pages 672-683 ; 19328184 (ISSN) ; Manshaei, M. H ; Naderi Soorki, M ; Saad, W ; Goudarzi, M ; Niyato, D ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
Cooperative cloud providers in the form of cloud federations can potentially reduce their energy costs by exploiting electricity price fluctuations across different locations. In this environment, on the one hand, the electricity price has a significant influence on the federations formed, and, thus, on the profit earned by the cloud providers, and on the other hand, the cloud cooperation has an inevitable impact on the performance of the smart grid. In this regard, the interaction between independent cloud providers and the smart grid is modeled as a two-stage Stackelberg game interleaved with a coalitional game in this article. In this game, in the first stage the smart grid, as a leader...