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The Internet of Things is envisioned to consist of many devices that are all interconnected. In order to achieve this goal, efficient networking techniques are needed that can connect low-power devices to the rest of the world. This paper presents a new protocol that enables sensor networks to efficiently communicate with a base station. The proposed JetNet protocol utilizes a combination of time...
In wireless Media Access Control (MAC) environment, management of channel access and controlling of packet transmission is done via shared channel in a distributed way. MAC protocols objectives for Wireless Network is to maximize channel utilization and minimizing channel access delay. It is MAC protocol's responsibility to provide best possible utilization of provided bandwidth while fulfilling the...
In this paper a novel synchronization method for wireless sensor networks with star topology is presented. We address timing synchronization using low frequency real-time clocks in all nodes. A beacon-driven TDMA-protocol for bidirectional node/base communication is used. Between the beacons, which are sent by the base station, lie the superframe time intervals to handle data transmission from node...
Time division multiple access (TDMA) schemes are intensively being the main solution to provide predictability and timeliness in data communication systems requiring real-time operation. In this paper we investigate the problem of low efficiency and channel utilization, common to the TDMA algorithms. As a solution, we propose a general slot stealing version of TDMA, able to significantly increase...
In this paper, we propose a time division method to solve the congestion control problem for an event-driven sensor network. In this method, a node adjusts time (therefore bandwidth) assigned to each upstream node by a dynamic TDMA approach to efficiently use resources available to the system and avoid the situation in which a node cannot send event information to the BS on time through the insufficiently...
Wireless sensor networks enable the development and implementation of a wide range of applications related to home automation, environmental, safety, health, industrial environments and monitoring. However, there are still some application areas that have not been addressed efficiently, such as wireless sensor networks capable of operating in noisy environments. These operating conditions adversely...
Harsh industrial environment requires reliable and secure wireless networks for non-critical monitoring and alerting. To meet these requirements, the three mainstream wireless industrial standards use time division multiple access (TDMA) mechanism providing the full spectrum to deterministic access. In such networks, the number of sensors often varies that may cause whole network link rescheduling...
When the Time Division Multiple Access (TDMA) protocol is used to schedule communication over a shared medium in wireless sensor networks, clock drift can be tolerated using guard time. A guard time is a short time interval that is added between the TDMA slots. Using guard time requires extra time and energy, which is critical in wireless sensor networks operating on limited energy. In this case study,...
Transmission reliability and energy consumptions are two critical concerns associated with wireless sensor network (WSN) design for a long time and continuous operation. With the increase in reliability of the transmission, the energy consumption increases by affecting the efficiency of the network. This paper proposes the Schedule based Collision Avoidance (SCA) algorithm for finding the tradeoff...
In one hand, sensor nodes consume low energy when they communicate with TDMA protocol, by eliminating collisions and idle listening. On the other hand, data aggregation algorithms are used to gather and aggregate data in an energy efficient manner so that network lifetime is enhanced. TDMA protocols are more power efficient since nodes in the network can enter inactive state until slot times will...
Channel allocation and Channel access are considered to be the most important issues in Wireless Communication System. MAC protocols for wireless sensor networks based on CSMA/CA induce high overhead due to RTS/CTS packets and does not completely eliminate hidden terminal problems. A new technique, called Grid based Channel allocation and Access scheduling using Latin Squares (GAALS) can be effectively...
Addressing the extremely high reliability is a critical problem of wireless control system in actual industrial applications. In this paper fully considering the characteristics of the wireless network transmission and industrial automation application, a grouping TDMA access approach based on multiple access points is proposed. The main idea is that: redundant multiple access points are applied in...
In this technical world, Sensor networks are dense wireless networks of small, low-cost sensors, which collect and disseminate environmental data. From a wireless sensor network, how fast can information can be collected and organized as tree, the above question is analyzed here. Number of design factors such as time, frequency scheduling and power control, routing are consider here, and every node...
The clustering algorithms designed for traditional sensor networks have been adapted for energy harvesting sensor networks (EHWSN). However, in these algorithms, the intra-cluster MAC protocols to be used were either not defined at all or they were TDMA based. These TDMA based MAC protocols are not specified except for the fact that cluster heads assign time slots to their members in a random manner...
WirelessHART standard is the first international standard for Industrial Wireless Sensor Networks (IWSN) approved by International Electrotechnical Commission (IEC), and, as such, it is worthwhile to implement on simulator platforms. Based on the study of WirelessHART standard, this paper is a primary implementation of the Medium Access Control layer of WirelessHART standard. To our best knowledge,...
A Wireless Body Area Network (WBAN) consists of different tiny physiological wearable sensors to monitor the vital signs of a human body and these sensor nodes transmit in real-time the sensed physiological information to the on-body coordinator or server over a wireless medium. Any radio frequency based wireless device suffers from interference due to the existence of other wireless devices operating...
This paper designs a intelligence wireless security alarm system based on MSP430 micro controller and nRF905 wireless transceiver module. First, it designs a wireless alarm terminal and formats a distributed wireless network based on TDMA. Alarm terminal adopts ultra low power MSP430F149 as MCU, and nRF905 as wireless chips. It designs the human body detector based on BISS0001, smoke sensor module...
Wireless sensor networks (WSNs) are deployed for a wide range of applications that involve collecting information from the operational region in which they inhabit. Depending on the application, sensor nodes may have to transport a time-varying load of sensing data. However, medium access protocols used in WSNs are not generally designed to deal with time varying traffic and may be efficient only...
Wireless HART is a state-of-the-art solution for a time-division multiple-access (TDMA) based wireless private area network. It combines slow frequency-hopping and a TDMA scheme that utilizes a centralized a-priori slot allocation mechanism. In this paper we conduct a performance evaluation of the Wireless HART TDMA protocol and provide insights into the major factors impacting energy consumption...
The growing popularity of sensor networks has resulted in the creation of various MAC protocols, each optimized for a different set of application requirements. However, all of these heterogeneous MAC protocols are designed under the assumption that all nodes in the wireless environment use a common MAC protocol. When multiple sensor networks are deployed in the same wireless environment, this assumption...
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