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Multichannel solutions are increasingly used to cope with the problem of low capacity in sensor networks resulting from high contention during wake-up periods of nodes. We can consider wake-up schedules as virtual channels, because nodes using different schedules cannot communicate with each other. In this paper, we show that multiple virtual channel solutions come at the cost of an increased energy...
Recent advances in the physical layer have enabled the simultaneous reception of multiple packets by a node in wireless networks. In this paper, we present a generalized model for the throughput optimization problem in multi-hop wireless networks that support multi-packet reception (MPR) capability. The model incorporates the multi-access channel, which accurately accounts for the achievable capacity...
Wireless Mesh Network (WMN) is an emerging communication paradigm to enable resilient, cost-efficient and reliable services for the future-generation wireless networks. In this paper, we study the problem of multipoint-to-multipoint (M2M) multicasting in a WMN which aims to use the minimum number of time slots (minimum latency) to exchange messages among a group of mesh nodes in a WMN with mesh...
In this paper, we propose a novel dynamic phase shift (DPS) scheme for energy efficiency in multi-hop wireless sensor networks. The DPS algorithm allows not only a receiver to shift its wake-up schedule dynamically to a sender's wake-up schedule, but also a sender to shift its wake-up schedule dynamically to a receiver's wake-up schedule to reduce the energy waste that occurs during a rendezvous period...
With the increasing popularity of wireless mesh networks (WMNs), broadcasting traffic (e.g. IP-TV) will contribute a large portion of network load. In this paper, we consider a multi-channel multi-interface WMN with real time broadcast call arrivals. Aiming at maximizing the call acceptance rate of the network, an efficient broadcast tree construction algorithm, called Schedule-based Greedy Expansion...
In this paper we explore a fundamental joint routing and scheduling problem in wireless mesh networks (WMNs) that employ time division multiple access (TDMA). The problem, referred to as the minimum cost single flow routing and scheduling (MC-SFRS) problem, deals with incremental update of transmission schedules necessitated by dynamic arrival of new flows and termination of existing flows during...
In order to guarantee collision-free transmissions in TDMA-based wireless sensor networks, a substantial amount of work in literature has been done by modeling the problem into minimum graph coloring. However, our observation reveals that such approach is not effective towards low-latency transmissions due to the inherent principle of the graph coloring. This paper introduces DCLS, a distributed collision-free...
Emerging applications in Wireless Sensor Networks (WSNs) demand notable in-network processing capacities rather than simple data gathering and dissemination. Therefore, the performances of the network like latency and energy consumption are greatly affected by how the various application requirements are mapped to the processing nodes in the network. This paper investigates intelligent task mapping...
The IEEE 802.15.4 standard was developed for the purpose of media access control of low power wireless personal area networks. Wireless sensor network devices have the general characteristics of low power capabilities and operation. From this point of view, it makes technical sense to use the IEEE 802.15.4 standard for the MAC layer of wireless sensor networks. There are several modes of operation...
We describe our experience from the implementation of the T-MAC protocol for wireless sensor networks in the open-source Castalia simulator. Notwithstanding the popularity of the protocol in the research literature in recent years, we find several practical issues that are not addressed in the original protocol description, which lead to a degree of freedom in the protocol design and implementation...
Energy constraints in wireless sensor nodes necessitate the design and development of energy-efficient MAC protocols to arbitrate access to the shared communication medium. While there exists a plethora of sensor MAC protocols, these protocols do not individually vary the duty-cycle of each sensor according to local connectivity status, to maximize energy savings. In this paper, we propose A^2-MAC...
In most existing sender-initiated handshaking based underwater Media Access Control (MAC) protocols, only the initiating sender is allowed to transmit data packets to its intended receiver after the channel has been reserved; none of the potentially backlogged neighbors of the sender can transmit in the duration after the current handshake. Therefore, each of those neighbors must initiate their own...
The activity scheduling of sensors to alternately wake up for sensing obligation such that the network lifetime can be efficiently prolonged is a very important issue in wireless sensor networks (WSNs). Target area coverage is a new coverage problem in wireless sensor networks. The paper addresses the target area coverage problem and schedules sensors to alternatively wake up to collaboratively cover...
In numerous sensor network applications, a group of nodes surrounding an event (forming an active region) must collaborate to collect locally generated data, reliably and efficiently. Active regions are often characterized by intense data transfer, packet collisions and congestion, resulting in significant network performance loss. Previous studies dealt these scenarios either at the application or...
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