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This paper proposes a new time division multiple access (TDMA) based multi-hop resource(slots) reservation protocol (TMRR) for tactical mobile adhoc networks (T-MANET). TMRR lets a node reserve the channel resource for multi-hop packet transmission in consecutive order, so that the packet transmission between a source node and a multi-hop away destination node is possible within a superframe. This...
The employment of device monitoring, diagnosis and condition-based maintenance is one of the potential approaches for enhancing operational efficiency and reducing energy consumption of industrial machines. Industrial wireless sensor networks (IWSNs) for device monitoring are appealing to industry due to their inherent advantages compared with traditional wired systems, such as low cost, convenience...
Ethernet is becoming a common network technology for industrial and factory automation systems and, in recent years, a big effort has been made in enabling real-time communications using Ethernet technology. Many of these systems are complex, extend over relatively large places and/or integrate a significant number of nodes, thus requiring the use of multiple switches (hop). In this paper we look...
Wireless sensor networks are appealing to researchers due to their wide range of application. This paper proposes Variable Grid-quorum Pattern MAC protocol (VGP-MAC), an adaptive, asynchronous and low-latency MAC protocol designed for wireless sensor networks. VGP-MAC improves the pattern and timeslot schedule, which make nodes save energy by the proper sleep mechanism according to the nodes' own...
The goal of this paper is to make an investigation and a timing analysis of several interesting communication protocols designed to be used in industrial control networks. By comparing protocol properties with application requirements, an appropriate protocol for the demands of the communication system can be found. The selected fieldbus protocols are discussed and a comparison of their static network...
The wireless communication technologies, such as wireless sensor network, can bring great economic benefits to industrial plants. But the open channel and multi-hop network topology will influence its real-time and reliable performance. Funneling effect is a kind of congestion caused by the wireless hop-by-hop and many-to-one networks. IEEE802.15.4 is a wireless personal area network standard that...
Despite their limited resources, especially energy, wireless sensor networks (WSNs) are being accepted in many application areas. This makes them a challenging yet an appealing research area. Evidently, a lot of research work revolves around energy efficiency in order to prolong WSNs lifetime. A prominent amount of work suggests keeping radios of sensor nodes in low power sleep mode for most of the...
We present the implementation and experimental evaluation of a new, fully distributed protocol for random access systems that exploits symbol-level physical layer cooperation. By allowing single-antenna nodes to cooperate with their neighbors, MIMO-like performance is achieved. Our Distributed On-demand Cooperation (DOC) protocol is unique in its ability to realize a cooperative mode only under circumstances...
The mass-target real time localization system has great potential applications. However, the indoor results in a complex radio environment; the people moving results in the time vary channel; and the mass people in the monitoring area cause the interference and collision. Therefore, there is a great challenge for deploying the low cost RF devices to implement high accurate localization system. In...
Tactical mobile ad hoc networks (MANETs) have a continued growth in bandwidth demand mainly driven by the introduction of new user services and applications. Everything over IP is one of the main requirements of the next generation tactical MANETs. As part of an initial investigation to provide enhanced tactical IP networking capabilities, an adaptive VHF/UHF system that attempts to satisfy the mobility,...
This paper discusses on-going work investigating the use of IEEE 802.15.4 in a network architecture for factory automation, which aims at satisfying the requirements of industrial applications. In particular, one of the targets of the proposed architecture is to meet the typical real-time and QoS requirements found in industrial networks in a flexible way.
Sensor networks have been investigated in many scenarios and a good number of protocols have been developed. With the standardization of the IEEE 802.15.4 protocol, sensor networks became also an interesting topic in industrial automation. Here, the main focus is on real-time capabilities and reliability. We analyzed the IEEE 802.15.4 standard both in a simulation environment and analytically to figure...
Future active-safety applications in vehicular networks rely heavily on the support for real-time inter-vehicle communication. The medium access control (MAC) mechanism proposed for the upcoming IEEE 802.11p standard intended for intelligent transport systems (ITS) applications does not offer deterministic real-time support, i.e., the channel access delay is not upper bounded. We therefore propose...
In recent years, IEEE 802.11 wireless networks become one of the most important components in wireless networks, since compared with other wireless technologies, IEEE 802.11 devices are inexpensive and easier to be configured. To provide seamless roaming in the IEEE 802.11 wireless networks, MAC layer handoff latency should be minimized to support real-time applications. This paper proposes a novel...
Quality of Service (QoS) support has become a key factor in designing Media Access Control (MAC) protocols. This paper introduces a novel scheduling scheme which supports priority based QoS in Wavelength Division Multiplexing (WDM) star networks. The proposed Interval-based Prioritized Orderly Scheduling Strategy (IPOSS) employs a collision-free scheduling approach and handles variable-length data...
Media access control (MAC) protocols of wireless sensor networks (WSNs) must minimize the radio energy costs in sensor nodes. Latency and throughput are also important design features for MAC protocols in the current WSNs applications. But most of them cannot guarantee quality for real-time traffic. This paper studies the state of the art of current real-time MAC protocols, and then introduces a medium...
This paper proposes AREA-MAC, a medium access control (MAC) protocol for wireless sensor networks (WSNs). AREA-MAC reduces latency and energy consumption of nodes by using low power listening (LPL) with short preamble messages. Other protocols like B-MAC use long preamble messages that cause higher latency, energy consumption, and control overhead on nodes. AREA-MAC provides a reasonable trade-off...
Based on the concept of random contention and collision resolution, a distributed QoS-guaranteed multiple access (QMA) protocol for mobile ad hoc networks is proposed to support multimedia service and multihop architecture. In the protocol, nodes with real-time traffic have higher priority to access channel than those with non-real-time traffic by broadcasting forecast bursts (FB) in earlier group...
Wireless local area networks (WLANs) are increasingly popular because of their flexibility. This spreading of WLANs comes with an increasing use of multimedia applications. Such applications are bandwidth sensitive and require a quality of service (QoS) that guarantees high performance transmission of continuous data. This requirement is the focus of the new enhanced IEEE 802.11e standard protocol...
In this paper, we propose a Medium Access Control (MAC) extension, called Medium Access for Contention Assistance (MACAT), to enhance Quality-of-Service (QoS) for IEEE 802.11 and IEEE 802.11e co-existing networks. In MACAT, IEEE 802.11e stations act as assistants for channel access of legacy stations with real-time traffic. With the assistance of 802.11e stations, the legacy stations have a higher...
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