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In this paper, we propose a multi-sink data transfer protocol for wireless sensor networks, called negotiation-based multi-sink data transfer (NMDT). NMDT is based on the packet flooding method, but the direction of packet flooding in each sensor node is dynamically controlled, taking into consideration the network traffic around the sensor node. Thus, stable sensed data transfer and collection can...
The development of ICT (Information and Communication Technology) industry has emerged as one of the major sources of world energy consumption Especially, energy consumption on base station is a large portion of total energy consumption In this paper we study with energy efficient power control mechanism for base station in mobile communication systems. We proposed a efficient sector power control...
Due to the broadcast nature of wireless channels, neighbouring sensor nodes may overhear packets transmissions from each other even if they are not the intended recipients of these transmissions. This redundant packet reception leads to unnecessary expenditure of battery energy of the recipients. Particularly in highly dense sensor networks, overhearing or eavesdropping overheads can constitute a...
In this paper, a new opportunistic feedback protocol for orthogonal frequency division multiple access (OFDMA) systems with mixed realtime (RT) and non-realtime (NRT) traffic is proposed and analysed. Based on the proposed feedback mechanism, a dedicated feedback channel is allocated for each RT user, while shared feedback channels are available for all NRT users. NRT users have to compete to send...
Debugging of embedded wireless systems is a challenge as the amount of information available from the nodes is limited. To enable system-level debugging of wireless networks, we have devised a distributed assertion support based on SystemVerilog Assertions (SVA). In this work, we have modeled wireless sensors at the transaction level in SystemVerilog. The proposed approach indicates that the assertions...
Wireless sensor networks (WSNs) have been applied in areas such as military surveillance, environmental monitoring, habitat and structural monitoring, domotics, battlefield surveillance and robotics. The aim of this survey is to present the state-of-the-art in localization algorithms which consider the combination of different factors such as localization schemes, propagation models, communication...
A retransmission cut-off algorithm for Slotted ALOHA random access protocol is studied in terms of the new packet generation rate, the number of retransmission trials and the Multi-packet Reception capacity. The retransmission cut-off is not needed for a stable operation of Slotted ALOHA if the new packet generation rate is below a critical limit. The values of these critical limits increase almost...
Wireless sensor networks have the problem of lifetime and scalability. To increase lifetime and scalability itpsilas necessary to have control over topology of the network. Dynamic clustering with adaptive feature is the best way to achieve the above. In this paper we propose a dynamic multilevel hierarchal clustering (DMH) approach for sensor networks. The proposed approach will create a dynamic...
The problem of cache sharing for supporting data access in mobile ad hoc networks is studied in this paper. The key to this problem is to discover a requested data item in an efficient manner. In the paper, we propose two caching protocols, IXP and DPIP, which distinguish themselves from the existing ones in that they fully exploit in-zone broadcasts to facilitate cache sharing operation. In particular,...
Congestion avoid in wireless sensor networks is a critical issue, it will not only affect transmission reliability, and will waste valuable energy resources. In order to reduce the wireless sensor network routing instability, we proposed a novel altering routing congestion control protocol for wireless sensor networks (CAAR). In this paper, we develop: 1) based on cognition detection technology to...
This paper studies nonlinear instability and bifurcations in a packet reservation multiple access (PRMA) protocol for communication of voice and data terminals. This protocol has been widely considered for providing speech and data communications in a terrestrial microcell system. Recently modified versions of the PRMA protocol have been the subject of extensive research, with the goal of application...
To increase the lifetime and scalability of a wireless sensor network (WSN) it is necessary to have control over topology of the network. Dynamic clustering is one way for achieve the above defined objective. In this paper we are proposing a multi-level hierarchal clustering approach for WSN. Our proposed approach in this paper is to create a system which will adopt a topology (i.e. size of cluster...
The use of automatic repeat-request (ARQ) over a mobile ad-hoc network (MANET) presents unique challenges in handling signaling, connection identification, and implementation. This paper describes the implementation of a selective-repeat ARQ protocol in a mesh MANET called mesh-enabled tactical adaptive - MANET (METAMANET). The mesh MAC operates over the 802.16d physical (PHY) layer. The implementation...
Supporting future large-scale vehicular networks is expected to require a combination of fixed roadside infrastructure (e.g. Road Side Units, RSU) and mobile in-vehicle technologies (e.g. On Board Units, OBU). The need for an infrastructure, however, considerably decreases the deployment area of VANET applications. In this paper, we propose a self-organizing mechanism to emulate a geo-localized virtual...
In many reliable Wireless Sensor Network (WSN) applications, messages have different priorities depending on urgency or importance. For example, a message reporting the failure of all nodes in a region is more important than that for a single node. Moreover, traffic can be bursty in nature, such as when a correlated error is reported by multiple nodes running identical code. Current communication...
Adaptability is a key strategy in the design of effective wireless sensor networks. Communication schemes need to adapt to dynamic topologies and fluctuating traffic rates. Applications have to alter their behavior to respond to mutated necessities or to cope with environmental changes. The network, as a whole, has to tolerate the disappearance of faulting nodes or the appearance of additional ones...
Wireless sensor network has been widely used in many types of monitoring application in these recent years. For monitoring application such as forest or building monitoring, sensor nodes equipped with temperature sensor, smoke detector and camera will trigger immediately when a fire breaks out. Due to those sensor nodes are transmitting the sensor packets to a sink node at the same time and without...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
With much more advanced techniques employed, various applications can be supported by 3G CDMA-based wireless networks. Providing differentiated service over wireless networks has become a very important issue in the design of wireless networks. A new media access control protocol with a hierarchical scheduling algorithm to provide differentiated service for CDMA-based wireless networks is proposed...
Wireless sensor networks need an efficient and reliable reprogramming service to facilitate management and maintenance tasks. In this paper, we propose a reprogramming mechanism, which is based on the hierarchy in the network. We divide the nodes in the network into two types of nodes (i.e. super nodes and normal nodes). We first send codes to nodes in the upper layer of the node hierarchy (i.e.,...
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