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In multi-hop wireless mesh network (WMN), hidden node is one of the major problems when IEEE 802.11 DCF is used as a MAC protocol. It causes data packet collisions between the multi-hop links and significantly affects the network performance. In order to avoid this problem, a novel routing scheme is proposed in this paper. It uses a high sensitive sensing function utilized for cognitive radio. The...
Wireless Sensor Network(WSN) is widely used in Emergency Management System(EMS) to assure requirement of safety in current society. When emergency happens, timely transmitting emergency information in changing environment should be assured. But this requirement can not be satisfied by conventional approaches which are based on static situations and centralized management. In this paper, to assure...
Pervasive information gathering has became more and more important in people's daily life during the last decade. However, in some critical network scenarios such as Delay-Tolerant Mobile Sensor Network (DT-MSN), due to the sparse connectivity, node mobility and limited buffer, the traditional approaches for collecting information application may not work effectively without a stable end-to-end path...
Wireless sensors networks (WSN's) have a lot of ability for spreading in the areas where wired networks can't operate correctly and old versions of wireless networks aren't useful. WSN's consist of many sensors that place in an unavailable area. The method of routing to transform information from sensor nodes to the Base station is very important and one of the main needs of WSN is the best method...
Epidemic Routing offers a reliable approach to transmitting data in opportunistic networks, which has developed a few of variations so far. However, these algorithms have some redundant control overhead in sensing neighbor nodes and exchanging data packets. To address the issue, we propose a high-efficiency low-delay routing algorithm based on exchange of increments in packet indexes. Our algorithm...
Energy (battery) of the sensor node is considered as the scarcest resource in Wireless Sensor Network (WSN), hence a communication protocol that efficiently uses the limited energy must be developed. In this paper, Region-based Energy-aware Clustering (REC) scheme is presented to optimize the energy usage, with clustering has been identified as an effective data forwarding technique in WSN. With REC,...
Sensor networks are composed of many sensors usually far from the region is available. Routing in wireless sensor networks for the transfer of information from sensor nodes to base station is especially important. Optimum consumption of energy is important requirements in wireless sensor networks because sensor systems typically use battery power. In this paper with a routing algorithm to determine...
Data aggregation is an important issue in wireless sensor networks which gathers and routes information through a multi-hop network and processes data at intermediate nodes. This paper considers how to construct data aggregation tree in wireless sensor network where there are several source nodes and a single sink. Ant Colony Optimization algorithm is an effective distributed approach. It has been...
Power-aware routing, have been studied to avoid energy-scarce sensors and achieve network lifetime improvement but recently, it was noticed that sink mobility can also be used to improve network lifetime by avoiding excessive transmission overhead at nodes that are close to the location that would be occupied by a static sink. Also in many situations, a static sink may be unfeasible because of deployment...
In this paper, we propose a distributed scheme for data gathering using a mobile data collector in wireless sensor networks (WSNs). In our scheme, a mobile data collector moves along a predefined track over the sensing field and data are forwarded to nodes whose transmission disks overlap with the trajectory of the data collector; these nodes are called relaying nodes. Data are classified into two...
In wireless ad hoc and sensor networks, each node is capable of functioning using only its local information about the environment. However, such a node can reach only locally optimal decisions that may prevent the network from ever reaching the global optimum performance for the given application. To avoid this problem, each node needs to cooperate with others to gain knowledge about the overall...
This paper develops Ant Colony optimization (ACO) algorithm and applies it to energy control and congestion control on wireless sensor network route. The pheromone and the energy of the node are combined to affect the pheromone consent ration in optimization path, which can avoid network congestion and fast consume of energy of individual node. Then it can prolong the lifecycle of the whole network...
This paper addresses the problem of robust transmission of sensed data through a vast field of small and vulnerable sensors towards a sink node. It introduces a routing algorithm called P-GRAB relying on a probabilistic gradient broadcasting framework. Our aim is to improve the GRAB algorithm by accounting for the energy expenditure and the potential of a node for creating interference in the forwarding...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
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