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This paper considers a relayed broadcast in IEEE 802.11 wireless local area (WLAN) networks. In the relayed broadcast, a source node intends to deliver data frames to many nodes beyond its coverage and all the nodes except the source node attempt to relay the received data frames in a contention-based and distributed manner. This traffic dissemination scheme, referred to as flooding, has several problems...
Considering unreliable wireless backhaul connections across transmitters, we investigate the outage performance of a finite-sized selective relaying system with M transmitters and N relays under Nakagami-m fading channels. To send the source message to the destination, the transmitter-relay pair providing the highest end-to-end signal-to-noise ratio is selected for transmission. The backhaul reliability...
With the emerging of the fifth generation (5G) mobile communication systems, millimeter wave transmissions are believed to be a promising solution for vehicular networks, especially in vehicle to vehicle (V2V) communications. In millimeter wave V2V communications, different vehicular networking services have different quality requirements for V2V multi-hop links. To evaluate the quality of different...
Internet of Things (IoT) depicts an intelligent future, where any IoT-based devices having a sensorial and computing capabilities to interact with each other. Recently, we are living in the area of internet and rapidly moving towards a smart planet where devices are capable to be connected to each other. Cooperative ad-hoc vehicle systems are the main driving force for the actualization of IoT-based...
This article focuses on the question of the necessity and the amount of maintenance of protective relays and automation. It analyzes carefully current published works on this subject. In addition, the probabilistic model of protective relay's device state is constructed and applied here.
Molecular communications (MC) is a promising paradigm which utilizes molecules to implement communication among nano-machines. Cooperative relaying strategies can be used to extend communication distance and achieve reliable remote communications. In this paper, a two-hop diffusion-based molecular communication with three nano-machine nodes is considered. To mitigate the drawback of traditional cooperative...
In recent years, with the rapid development of China's high-speed railway, high-speed rail EMU production is also increasing, but the existing high-speed rail EMU brake test system requires a lot of manual operation, recording, workload, braking signal and data, vehicle status confirmation can not be centralized managed, archiving. The structure is complex with high maintenance requirements and the...
Infrastructure monitoring is an important class of wireless sensor network (WSN) applications. When the topology of a WSN designed for infrastructure monitoring is linear in nature, such as bridges, highways and pipelines, this kind of WSN is known to be linear WSN (LWSN). To achieve the high-reliable infrastructure monitoring services, hybrid LWSN has been designed where a limited number of support...
A large number of sensor nodes are deployed to remote locations and left unattended for a long time in wireless sensor network applications. When a battery-powered sensor node depletes its energy, it is assumed as “dead” and recharging or replacing the battery is not possible in most of the applications. Lifetime of the wireless sensor network depends on the efficient use of available restricted energy...
With the aim to solve the frequent network reconfiguration problem caused by link failure in the broadband powerline communication (BPLC) system, this paper inroduces the two-way power frequency automatic communication system (TWACS) into current BPLC system. And in this BPLC and TWACS integrated communication system, a TWACS signaling based routing searching algorithm is proposed, to meet the requirements...
Due to the increasing low capacity distributed generators (DGs) installations and penalization of supply disruptions in electrical distribution grid, it is necessary to invest in the distribution protection system. This paper discusses profitability of installation of relays with distance protection function that could protect lines of different voltage levels, lengths and other relevant attributes...
To guarantee secure communication of the primary system and efficiently utilize the licensed spectrum, in this paper, we propose a two-path successive relaying and jamming based cooperative transmission (TSRJC) scheme. In TSRJC scheme, two secondary users (SU) successively relay the primary message and jam the primary eavesdropper to confirm secure and reliable transmission of the primary system during...
Using relayers in wireless networks enables higher throughput, increased reliability or reduced delay. However, when building networks using commercially available hardware, concurrent transmissions by multiple relayers are generally not possible. Instead one specific relayer needs to be assigned for each transmission instant. If the decision regarding which relayer to assign, i.e., which relayer...
This paper presents the development of wide area protection (WAP). The studied case focuses on Vientiane Capital area, Lao PDR. It consists seven substations which are connected the loop network in 22 kV distribution system. The protection system based a characteristic are setting on substation each. The fault area in circuit mainly was affecting the operation of protection, when has occurred a fault...
We analyze the performance of a multi-source multi-helper transmission with lossy forward (LF) relaying. In LF, estimates at the relay are encoded and forwarded to the destination for improving the reliability of the received sequence transmitted from the multiple source nodes. Unlike the conventional decode-and-forward (DF) relaying, LF sends the data even in the case where decoding is not error-free...
Vehicular communications have a great potential to improve intersection safety and traffic efficiency. Achieving a high application performance is challenging due to the specific propagation conditions caused by buildings and obstacles found at urban intersections. Relying on the state-of-the-art solution for vehicular communication based on IEEE 802.11, we extend contention-based forwarding to distribute...
Geographic routing protocols establish scalable and robust routes for multi-hop trsdansmission in wireless mobile ad-hoc networks, where accurate location information of the mobile nodes is needed. Aiming to alleviate the influence of location errors, existing works focus on modifying routing protocols through modeling the error sources and mobility prediction. In this paper, we propose a cooperative...
This paper concerns the smart exploitation of multimodal communication capabilities of underwater nodes to enable reliable and swift underwater networking. To contrast adverse and highly varying channel conditions we define a smart framework enabling nodes to acquire knowledge on the quality of the communication to neighboring nodes over time. Following a model-based reinforcement learning approach,...
In this paper, we consider automatic repeat request based multihop communication between a source and a destination. We present the design of near-optimal power control policies which minimize the packet drop probability (PDP), when the energy cost to receive and decode a packet is non-negligible. The design problem is a nonconvex mixed integer nonlinear program, which, in general, is NP-hard to solve...
We present MAP, a contention-free MAC protocol for fast and reliable multi-hop data dissemination in vehicular ad hoc networks which takes advantage of two-packet collisions to improve network capacity. MAP addresses both the problem of unwanted collisions due to hidden nodes in CSMA/CA-based networks, and the problem of excessive control messages in dense TDMA-based vehicular networks. MAP operation...
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