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The energy consumption of a WBAN system can be divided into three parts: transmitting, sensing and channel switching. Considering the fact that the WBAN system are power-supply limited, the energy-efficient spectrum handoff schemes have been proposed by many previous works, aiming at extending the endurance life of a WBAN system. In this paper, we consider a WBAN system which access multiple PU channels...
Packet-based Networks-on-Chip (NoC) have emerged as the most viable candidates for the interconnect backbone of future Chip Multi-Processors (CMP). The flit size (or width) is one of the fundamental design parameters within a NoC router, which affects both the performance and the cost of the network. Most studies pertaining to the NoC of general-purpose microprocessors adopt a certain flit width without...
We develop a queuing model to evaluate production and subcontracting policies commonly used in an assembled-to-order manufacturing system with service level constraints. The manufacturer determines production and inventory levels for the components using a base stock policy, and inventory is replenished from suppliers that have stochastic lead times. Customer demands for the assembled products can...
IEEE 802.11s Mesh WLAN is a promising access network standard launched for the aim of enhancing channels' utilization, coverage extension with simple and cheap network deployment. Mesh WLAN faces challenges in power management, channel assignment, traffic forwarding, admission control, security and coexistence with other technologies. The main objective of this paper is to increase the mesh WLAN throughput...
This paper presents a new multipath delay based algorithm, MPPERT (Multipath Probabilistic Early response TCP), which provides high throughput and efficient load balancing. In all-PERT environment, MPPERT suffers no packet loss and maintains much smaller queue sizes compared to existing MPTCP, making it suitable for real time data transfer. MPPERT is suitable for incremental deployment in a heterogeneous...
With the onset of multiple wireless technologies, the end-host devices of today are multi-homed. This has led to research in the simultaneous use of multiple paths between the multi-homed end devices. New multipath transport protocols such as Multipath TCP and Concurrent Multipath Transfer SCTP need to be fair to the existing transport protocols like TCP and SCTP in a congested network. One way of...
This paper proposes a scheduling approach for mobile uplink WiMAX system that provides a trade-off between delay requirement satisfaction and throughput maximization. The paper starts by introducing three scheduling algorithms each with a different objective. The first aim is to maximize the throughput of the system, while maintaining the user fairness. The second aim is to satisfy the delay requirements...
A network model with both social and communication characteristics is considered. Different capacity regions are computed as a function of the social network size for each node. It has been shown that as the social connectivity among nodes improves, the likelihood of finding shorter path between source-destination pairs in the network increases which results in increase in the capacity compared to...
The IEEE 802.11 standard does not define any feedback policy for the multicast transport. Hence missing multicast packets are not retransmitted and are definitely lost. In this paper we define the Block Negative-Ack (BNAK) recovery policy. Using our protocol, the multicast source transmits a block of multicast packets followed by a Block NAK Request (BNR). Upon reception of a BNR, a multicast member...
The Enhanced Distributed Channel Access (EDCA) mechanism has been adopted by media access control (MAC) layer of IEEE 802.11p to provide contention-based differentiated channel access for packets with different priorities. To analyze the performance of EDCA mechanism, the two-dimensional Markov chain model with the different contention windows(CW) and the internal collision and the frozen mechanism,...
Optimal resource allocation is an outstanding issue in wireless communication systems. In this work we focus on the ever challenging optimization of the tradeoff between throughput and fairness. Specifically, we propose a novel framework to analytically derive the maximum average throughput versus fairness under the assumptions that the throughput of each user i) increases if more resources are allocated...
In cognitive radio network, cooperation between primary users and secondary users can improve their data rate and achieve dynamic spectrum sharing. This paper proposes a novel spectrum sharing model to solve the opportunistic access problem in cooperative cognitive radio network (CCRN). In this model, primary users select sets of secondary users as their relays and allocate channel resource to secondary...
We study a system of multiple routers traversed by multiple TCP connections using TCP New Reno, CUBIC and Compound. More than one router may be congested. To analyze this system we will use earlier theoretical models of TCP New Reno and CUBIC but develop a new model of TCP Compound experiencing random packet losses and queuing delays. We model the router queues as M/GI/1 queues with arrival rates...
Scheduling multicast traffic in input-queued switches requires solving a hard combinatorial optimization problem in a very short time. This task advocates the design of algorithms that are simple to implement and efficient in terms of performance. We propose a new scheduling algorithm, based on message passing and inspired by the belief propagation paradigm, meant to approximate the provably optimal...
Web services are loosely-coupled business applications willing to cooperate in distributed settings within different groups called communities. Communities aim to provide better visibility, efficiency, market share and total payoff. There are a number of proposed mechanisms and models on aggregating web services and making them cooperate within their communities. However, forming optimal and stable...
In this paper, the problem of location classification in OFDMA-based FFR systems is considered for two FFR schemes, namely Strict FFR (FFR-A) and Soft Frequency Reuse (FFR-B). The FFR systems considered in the literature are mostly studied with static resource partitioning where a greater portion of the sub-carrier resources are reserved for users in the cell centre and a smaller portion for users...
In this paper, we address the problem of channel assignment considering partially overlapping channels (POCs) for interference avoidance in 802.11-based wireless mesh networks. A novel interference model is proposed which provides a systematic approach of measuring the interference caused by links operating on POCs by taking into account both the adjacent channel interference and the corresponding...
In this paper, we investigate the impact of the deployment of a second relay node in a cooperative communication scheme. The relay nodes relay packets from a number of users to a destination node. We assume that the two relays do not have packets of their own and the users have saturated queues and random access to the medium with slotted time. We obtain analytical expressions for the arrival and...
This work studies the joint scheduling — admission control (SAC) problem over a fading channel. In particular, the optimal trade-off between maximizing the throughput and minimizing the queue size (or average congestion) is investigated. The SAC problem is formulated as a constrained Markov decision process (MDP) to maximize a utility defined as a function of the throughput and the queue size. The...
The advent of cloud computing has offered to developers a new appealing paradigm to deploy their applications without capital investments. Resources can now be acquired on-demand in a flexible, scalable and rapid way. However, cloud providers lack of native mechanisms to guarantee the Quality of Service required by specific application domains. High availability can be achieved by replication of critical...
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