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Transmission Control Protocol (TCP) has long been used host-to-host over the internet in order to provide reliable and ordered exchange of data. A core component of the protocol is congestion control. Traditional forms of TCP congestion control such as New Reno have been shown to perform poorly over wireless links as a result of non-congestive losses induced by variations in the wireless channel....
Throughput of wireless packet transfer generally depends on the signal strength of wireless communication. The architecture of Wireless Distribution System (WDS) in an IEEE 802.11-based environment can avoid the decline of wireless signals and keep the data packet throughput by delivering packets among access points. This paper focuses on WDS and proposes an algorithm of Maximum Independent Set (MIS)...
The Wireless sensor network (WSN) deployment areas in real time environment are often inaccessible and unreliable communication resulting in degradation of network performance. The critical issues in any WSN are QoS and energy. Post deployment, it may not always be feasible to replace the batteries in a WSN. Long hops of transmission maintaining the QoS with more energy consumption results in reduction...
Wireless sensor networks are a large number of sensor nodes that can be deployed to monitor un-attended environment. These sensor networks are responsible to sense, computation and transmission. In certain conditions sensor node cannot able to communicate with its neighbor nodes and may turn to ‘dumb node’. In such situations it can sense its environment but is unable to communicate. Due to this the...
The paper presents cooperative communication based wireless sensor network for monitoring Green house related parameters such as Temperature, humidity and Carbon-di-oxide. The system is demonstrated by using network simulator NS2 with increased network capacity to suit large geo graphical areas. The comparison results show that cooperative transmission provides better performance than non-cooperative...
In this paper, a multiuser wireless powered communication network is considered where all users harvest energy from power beacons by wireless power transfer to support their uplink information transmission. A frequency-division duplex transmission scheme is adopted, where downlink power transfer and uplink information transmission are separated in different frequency bands. Compared with the time-division...
In this paper, we focus on the issue of maximizing the data collected by a mobile sink with unlimited energy which traverses a given straight path in an energy harvesting wireless sensor network (EH-WSN). Sensors are assumed to harvest energy periodically from the solar resources in their surrounding. Due to limitations on energy replenished within different time intervals, the sensors can reduce...
Advances in wireless technology have resulted in pervasive deployment of devices of a high variability in form factors, memory and computational ability. The need for maintaining continuous connections that deliver data with high reliability necessitate re-thinking of conventional design of the transport layer protocol. This paper investigates the use of Q-learning in TCP cwnd adaptation during the...
Constrained Application Protocol (CoAP) was developed to support the communication between resource constrained nodes via low-power links. As an Internet protocol, CoAP needs congestion control primarily to stabilize the networking operation. In this paper we propose a new round trip time based adaptive congestion control scheme, which improves CoAP by utilizing the retransmission count information...
Estimation-based backoff algorithms for channel access are being widely studied to solve the wireless channel accessing problem especially in super dense wireless networks. In such algorithms, the accuracy of the channel state estimation seriously determines the performance. How to make the accurate estimation in an efficient way to meet the system requirements is essential in designing new channel...
Recently, wireless networking technologies have been evolving to support wider bandwidth, and longer radio range in denser networks. Therefore, there is a high probability that two or more networks will overlap and result in more co-channel interferences. To mitigate the interference, the centralized network system is a promising solution which is based on the conflicts information provided by the...
This paper deals with the performance analysis of three different medium access techniques, namely contention-based, scheduled and polling-based access, utilized in a simple implementation of the wireless body area network (WBAN) IEEE 802.15.6 standard. Their comparison is focused on the trade-offs between polling and scheduled access, in terms of throughput, latency and energy consumption, and reveals...
The Internet of Things (IoT) applications is envisioned to require higher throughput protocols because of the increasing data amount. To significantly enhance the network throughput between IoT devices, this paper proposes a new link-layer data forwarding technique that is aware of link correlation (LC) and supports receiver initiated acknowledgement (RI-ACK). We also propose a multicast communication...
This paper studies a novel user cooperation method in a wireless powered communication network (WPCN), where a pair of distributed terminal users first harvest wireless energy broadcasted by one energy node (EN) and then use the harvested energy to transmit information cooperatively to a destination node (DN). In particular, the two cooperating users exchange their independent information with each...
Wireless Sensor Network (WSN) are primarily battery operated. Due to deployment of WSN in harsh environment, of WSN in harsh atmosphere, it's terribly tough to interchange or recharge the battery. So to enhance the lifetime of WSN, it is very essential to reduce energy consumption. non-identical traffic patterns of WSN plays a vital role in the power consumption. Time Adaptive Hybrid MAC (TAHMAC)...
We consider a two-way wireless powered cooperative system where the relay not only helps to forward the information for the user nodes, but also acts as an energy beacon. Assuming that due to the hardware limitation, harvesting energy and information transmission cannot be performed simultaneously, we propose a novel three-phase energy harvesting and transmission protocol. In the first phase, the...
In this paper, we propose a new Medium Access Control (MAC) protocol for Wireless Sensor Networks (WSNs) called MMSMAC (Multi-Mode Sensor MAC protocol), which can operate and switch among three modes: synchronous, asynchronous, and hybrid, according to the application requirements. In the synchronous mode, MMSMAC organizes the sensor nodes under even and odd clusters. Each sensor node has its own...
Game-theory based carrier sense multiple access (CSMA) protocols for wireless networks have recently emerged as a competitive alternative to classical CSMA based medium access control designs. The advantage of game-theory based approaches lies in the scope of precise mathematical analysis and hence predictable performance compared to approaches based on ad-hoc arguments and heuristics. In this poster,...
In the operation of industrial monitoring in distributed manner, new approaches have emerged to achieve the objective of efficient data exchange. Wireless sensor network has up came as an optimal solution to distributed monitoring. In the approach to precise monitoring and remote controlling, new approaches of resource controlling and operational controlling were developed. However, the node level...
The two major concerns of the wireless communication system are throughput of the network and underutilization of wireless channels. Opportunistic routing (OR) aims at improving the former and coping with the latter. Due to the unreliable characteristics of such channels, traditional routing achieves poor throughput. Since traditional routing arbitrarily selects high lossy links among diverse paths...
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