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Prolonging lifetime is an important issue in wireless sensor networks. When the sink is stationary in the network, the nodes close to the sink are bottleneck nodes since they relay more traffic than the other nodes. In this paper, we focus on balancing energy to prolong the networks lifetime. To protect the nodes around the sink, an uneven transmission policy is investigated. Moreover, by considering...
In dynamic networks, if the nodes are not scattered uniformly in area, to guarantee the coverage is difficult. However, we cannot use uniformly deployment strategy all the time. Uniformly scattering the nodes increases unbalanced traffic pattern in dynamic networks. Clustering seems a good solution for most problems of dynamic networks. However, there is another serious problem. Cluster heads (CHs)...
The paper presents the effect of traffic interval on the buffering in Go-Back-2 network. The paper represents behavior of Go-Back-2 network when different traffic intervals are used with different buffering capacities. The simulation is done and results are produced in the NS2 simulator. It is concluded that the increase in the traffic interval increases buffer size otherwise it degrades the performance...
Prolonging life time is the most important designing objectives in wireless sensor networks (WSN). In WSN the total amount of energy is limited, how to make best use of the limited resource energy is a very important aspect in research of WSN. In this paper we provide a method for determining the optimal number of cluster head for homogeneous sensor networks deployed in different scenario using a...
In multi-hop wireless networks, if we know the packet reception rates of all links in the network, we can find the path with the minimum energy consumption. However, to obtain the packet reception rates with high accuracy, we need a number of exchanges of probe packets. Also, the energy consumption along a path depends on a routing method. In this paper, we consider three routing methods and evaluate...
In this paper, we propose a new energy efficient Location Error Aware Routing (LEAR) protocol, which takes into account the location error being experienced by the forwarding relay. The majority of geographically informed routing algorithms assume access to accurate location information. However, in practical systems location measurements are prone to inaccuracies. In this work, we investigate how...
In this paper, a general framework, called probability-based solution (PBS), is proposed to balance the trade-off between the accessibility (in terms of the success probability to find a route reaching the destination) and the performance (in terms of spectral efficiency, outage probability or energy consumption) of distributed routing schemes in multi-hop wireless networks. In the PBS, the candidate...
In this paper, a greedy sub-channel redistribution routing scheme (GSRRS) is proposed for multi-hop wireless OFDMA networks. In GSRRS, between any two neighboring nodes, different sub-channels are routed over different paths including the direct one-hop path and the two-hop path with one intermediate node. Compared to the traditional routing scheme where all the sub-channels route over the same path,...
In this paper we present a novel technology named dynamic relay handover (DRH) for leveraging DSR and AODV for the benefit of providing a guaranteed network performance. The key points of DRH are the connectivity checking of the existing relay node and the assignment of a new relay node. In simulation of this algorithm based on OPNET Modeler 10.5, the effect of DRH on the network performance and the...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
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