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We consider data intensive cloud-based stream analytics where data transmission through the underlying communication network is the cause of the performance bottleneck. Two key inter-related problems are investigated: task placement and bandwidth allocation. We seek to answer the following questions. How does task placement make impact on the application-level throughput? Does a careful bandwidth...
MU-MIMO proposed in 802.11ac is to achieve higher data rate, with transmitting to multiple users concurrently. However, the overhead cost by collecting channel state information (CSI) sometimes even overwhelm real data transmission when quantity of user is large, which leads the network and unscalable. In this work, we address the problem with adaptive location-based CSI feedback compression (LFC),...
In order to improve the throughput of error correction decoding for the high-performance solid-state drives (SSDs), a semi-parallel low-density parity-check (LDPC) decoding architecture is proposed in this paper. The circuit of the LDPC decoder which can be dynamically configured with bit rate and code length is implemented using the scheduling control flow mode of single instruction multiple data...
Nowadays in wireless network the energy consumption and sensor node energy renewable is major challenge. Which make sensor network weak and more critical. The problem of node reachability is considered and Amended Ant colony optimization technique is proposed for optimization. The proposed technique is used for the search of estimated solutions to distinct and endless optimization problems and for...
Throughput starvation, which occurred under well-known exposed/hidden terminal problem in CSMA/CA based channel access mechanisms, will be a critical problem for future wireless LAN systems. This paper describes new schemes that identify starved access points (APs) and user equipments (UEs). One scheme identifies starved APs by observing the delay of beacon signals periodically transmitted by APs...
In this paper, we improve throughput performance of a cognitive radio network through a proposed dual-level sensing strategy. Throughput performance of secondary users cannot be enhanced while providing higher priority to protect primary users from secondary user interference. Therefore, we propose a novel multiple access scheme based on dual-level sensing strategy by which both the interference protection...
Channel access procedures of the state-of-the-art cellular standards create a significant overhead for small messages transmitted by Internet of Things (IoT) devices. As IoT becomes a major source of traffic for next-generation wireless communications, there are recent efforts to design low-overhead access schemes. Here we present the delay and capacity analysis of two low-overhead access protocols...
This paper proposes a perspective method of Digital Power Line Carrier channels throughput increase in transmission of Supervisory Control and Data Acquisition packet traffic from electrical substations. The proposed method based on capturing of data packets and their compression with application of Predictor algorithm. The paper presents results of experimental evaluation of SCADA data compression...
Unmanned aircraft systems are expected to open pathways towards the development of many new services. Owing to their airborne flexible mobility, systems using unmanned aircraft (UA) have a significant potential to change our daily lives. However, several issues with such systems need to be addressed. In particular, wireless transmission of data such as high quality video from a UA to Ground Stations...
Millimeter-wave (mm-wave) communication is a promising technology for supporting extremely high data rates in the next generation wireless networks. Mm-wave signals experience high path loss and directional transmission is required to compensate the severe channel attenuation. The special characteristics of the mm-wave propagation arise opportunities as well as challenges for the network resource...
This paper presents and analyzes a point-to-multi-point (P2MP) network that uses a number of free-space optical (FSO) links for data transmission from the central node to the different remote nodes. A common backup radio-frequency (RF) link is used by the central node for data transmission to any remote node in case of the failure of any one of FSO links. We develop a cross-layer Markov chain model...
In this paper, we investigate the delay and delay-constrained throughput performance of a point-to-point wireless-powered communication system, where one node, e.g. a user equipment (UE), is powered by the wireless energy transferred from the other node, e.g. an access point (AP), and uses the harvested wireless energy to send data to the other node. Our focus is on the delay performance of sending...
The effort to extend cellular technologies to unlicensed spectrum has been gaining high momentum. Listen-before-talk (LBT) is enforced in the regions such as European Union and Japan to harmonize coexistence of cellular and incumbent systems in unlicensed spectrum. In this paper, we study throughput optimal LBT transmission strategy for load based equipment (LBE). We find that the optimal rule is...
Millimeter wave (mm-wave) communication is a topic of intensive recent study, as it allows to significantly boost data rates of future 5G networks. In this paper, we focus on a mm-wave system consisting of a single Access Point (AP) and two User Equipments (UEs), where one UE requires high throughput, while the other is characterized by a low latency demand. Given that setup, we aim at optimally allocating...
Interference management through power control in wireless ad hoc networks has both the hidden terminal problem which induces collisions, and the exposed terminal problem which prohibits concurrent transmissions. Both problems are caused by the varied interference range induced by the adjusted transmission power. Through observing that the nodes adopt the power control mechanism induces collisions...
Low Energy Adaptive Clustering Hierarchy (LEACH) protocol is considered as one of the most important protocols that are frequently used in the Wireless Sensor Network (WSN). Many protocols were developed to modify and improve the LEACH protocol. The multi-hop technique (MHT-LEACH) is one of these protocols, which appeared to improve the performance of the LEACH protocol. In this paper, an improved...
A Wireless Sensor Network (WSN) is a wireless network consisting of small sensor nodes. Sensors are used to monitor physical or environmental conditions. WSNs are particularly used in military and civilian applications. As WSNs are generally deployed in an unattended area, they are prone to various types of attacks. One of the harmful attacks is Sybil attack in which a node illegitimately claims multiple...
A multi-channel network that uses a separate channel for control packets exchange in order to coordinate the data communication, is studied in this paper. We assume that the parallel data channels are divided into two groups, while an one to one correspondence among the data channels of the two groups is considered. This assumption is exploited by the proposed asynchronous transmission MAC protocol...
NVMe SSD over PCIe is attractive since it provides high throughput and low latency. However, complex internal SSD operations may cause a non-deterministic I/O latency which is one of the most important factors in a storage system. While conventional approaches to enhance I/O latency prediction are based on host systems, this paper proposes a novel SSD-based deterministic latency enhancement scheme...
Event-driven based traffic consideration in Wireless Sensor network (WSN) is a new area of research in the field of WSN. A few media access control (MAC) protocol has been proposed to handle the variety of both light and heavy traffic load situation such as RC-MAC which allows switching of modes to handle different traffic loads. In RC-MAC, nodes consume extra energy to stay awake like Receiver Initiated...
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