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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...
This paper proposes components for application scenario-dependent protocol stack re-selection for wireless sensor and actuator networks. In addition, the methodology and performance results of the different components are presented. As wireless sensor and actuator networks become more widespread, also the number of application scenarios in which they are used, increases. Furthermore, the extensive...
The medium access control (MAC) protocol defined in IEEE 802.15.4 standard is being considered as a promising technology for low-cost and low power wireless sensor networks (WSNs). In fact, the current IEEE 802.15.4 specifications don't avoid hidden node problem (HNP). In this paper, proposed scheme is dynamic group allocation scheme for avoiding HNP Based on grouping strategy for solving hidden node...
We consider a multipacket reception channel shared by several communication applications. This is the case, for example, in a single radio mesh network where neighboring cells use the same radio channel. In such scenarios, unlike the common multiple access model, several transmissions may succeed simultaneously, depending on the actual locations of the sending and receiving stations, and thus channel...
This paper presents an original performance analysis of the contention-based channel reservation schemes, namely UNI MAC in wireless communication systems. Here we mathematically derive the expression of the performance in term of success rate where the impact of misbehaving users is also taken into account. Validated with the simulation results, our numerical results show that the overall performance...
Wireless sensor networks (WSNs) emerge as underlying infrastructures for new classes of large-scale networked embedded systems. However, WSNs system designers must fulfill the quality-of-service (QoS) requirements imposed by the applications (and users). Very harsh and dynamic physical environments and extremely limited energy/computing/memory/communication node resources are major obstacles for satisfying...
The communications are interrupted by the hidden terminals in the traditional MAC protocols when the nodes?? power is asymmetric in WSN networks. On the basis of S-MAC the improved protocol is proposed. Node judges whether the power asymmetric nodes are occurred in the vicinity of it according to the link state with neighborhood nodes. Then neighborhood nodes broadcast bandwidth reservation (BRES)...
Many anonymous communication solutions have been proposed to provide anonymous mobile ad hoc network (MANET) communications. However, they mainly focus on the routing layer and above to hide the end-to-end traffic patterns. The point-to-point communication relations are often considered as non-critical information in terms of anonymity, which actually exposes the traffic patterns on the PHY/MAC layer...
In this paper, we present a hybrid ARQ scheme for wireless multicast, i.e., common information broadcast. In this scheme, incremental redundancy channel coding and packet retransmission are employed. This scheme enables the reliable delivery of the same copy of information to different users with mild delay. In addition, the design of the feedback channel for this scheme can be greatly simplified...
With the flourishing development of wideband wireless communication, wireless spectrum resource gets scarcer. Base on spectrum sensing of cognitive radio, we apply it in multi-channel MAC protocol of wireless mesh network, and propose a new multi-channel MAC protocol for cognitive wireless mesh network (CWMN-MMAC) in this paper. Depending on distributed spectrum sensing and negotiation of cognitive...
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