The impact of delayed ACK on TCP variants protocols in wireless network

2014 ◽  
Author(s):  
Sukant Kishoro Bisoy ◽  
Prasant Kumar Pattnaik ◽  
Amardeep Das ◽  
Mohit Ranjan Panda
Keyword(s):  
Wireless Network ◽  
Delayed Ack ◽  
The Impact

scholarly journals Introducing a Mobility Access Category for IEEE 802.11e

2020 ◽  
Vol 9 (5) ◽  
pp. 1610-1614
Keyword(s):  
Quality Of Service ◽  
Wireless Network ◽  
Ieee 802.11E ◽  
Network Simulator ◽  
Mobile Nodes ◽  
Mobile Stations ◽  
Simulation Scenario ◽  
Simulation Results ◽  
The Impact

With traffic increase in a wireless network beyond its capacity and as the number of connected devices continue to grow, the quality of service (QoS) degrades. In this paper we study the impact of mobility on throughput in the case of an infrastructure wireless network using IEEE 802.11 Wi-Fi standard. Since we found in the literature that the mobility of stations can have an impact on the quality of service, we try to remedy to this by implementing a new access category reserved for mobile stations. First we compare the throughput between static and mobile nodes, both connected to a QoS station. Then we propose our new model that consists of adding a new access category used by mobile nodes regardless of their traffic category. The study was made by simulating different scenarios using Network Simulator-3 (NS-3). We found that the throughput may vary depending on the simulation scenario. The simulation results show that with the proposed solution the mobile nodes can have a better throughput.

scholarly journals Enabling Cognitive Load-Aware AR with Rateless Coding on a Wearable Network

2008 ◽  
Vol 2008 ◽  
pp. 1-12 ◽  
Author(s):  
R. Razavi ◽  
M. Fleury ◽  
M. Ghanbari
Keyword(s):  
Energy Consumption ◽  
Cognitive Load ◽  
Error Correction ◽  
Wireless Network ◽  
Channel Coding ◽  
Rateless Coding ◽  
Head Mounted Display ◽  
Packet Arrival ◽  
Block Based ◽  
The Impact

Augmented reality (AR) on a head-mounted display is conveniently supported by a wearable wireless network. If, in addition, the AR display is moderated to take account of the cognitive load of the wearer, then additional biosensors form part of the network. In this paper, the impact of these additional traffic sources is assessed. Rateless coding is proposed to not only protect the fragile encoded video stream from wireless noise and interference but also to reduce coding overhead. The paper proposes a block-based form of rateless channel coding in which the unit of coding is a block within a packet. The contribution of this paper is that it minimizes energy consumption by reducing the overhead from forward error correction (FEC), while error correction properties are conserved. Compared to simple packet-based rateless coding, with this form of block-based coding, data loss is reduced and energy efficiency is improved. Cross-layer organization of piggy-backed response blocks must take place in response to feedback, as detailed in the paper. Compared also to variants of its default FEC scheme, results from a Bluetooth (IEEE 802.15.1) wireless network show a consistent improvement in energy consumption, packet arrival latency, and video quality at the AR display.

The Impact of Induced Spectrum Predictability Via Wireless Network Coding

2012 ◽  
Vol 61 (2) ◽  
pp. 758-769 ◽  
Author(s):  
Shanshan Wang ◽  
Yalin Evren Sagduyu ◽  
Junshan Zhang ◽  
Jason H. Li
Keyword(s):  
Network Coding ◽  
Wireless Network ◽  
Wireless Network Coding ◽  
The Impact

Wireless Cyber-Physical System Performance Evaluation Through a Graph Database Approach

2020 ◽  
Vol 21 (2) ◽  
Author(s):  
Mohamed Kashef ◽  
Yongkang Liu ◽  
Karl Montgomery ◽  
Richard Candell
Keyword(s):  
Wireless Communications ◽  
Wireless Network ◽  
Network Traffic ◽  
Smart Manufacturing ◽  
Graph Database ◽  
Traffic Data ◽  
Physical Processes ◽  
Process Data ◽  
Work Cell ◽  
The Impact

Abstract Despite the huge efforts to deploy wireless communications technologies in smart manufacturing scenarios, some manufacturing sectors are still slow to massive adoption. This slowness of widespread adoption of wireless technologies in cyber-physical systems (CPSs) is partly due to not fully understanding the detailed impact of wireless deployment on the physical processes especially in the cases that require low latency and high reliability communications. In this article, we introduce an approach to integrate wireless network traffic data and physical processes data to evaluate the impact of wireless communications on the performance of a manufacturing factory work cell. The proposed approach is introduced through the discussion of an engineering use case. A testbed that emulates a robotic manufacturing factory work cell is constructed using two collaborative-grade robot arms, machine emulators, and wireless communication devices. All network traffic data are collected and physical process data, including the robots and machines states and various supervisory control commands, is also collected and synchronized with the network data. The data are then integrated where redundant data are removed and correlated activities are connected in a graph database. A data model is proposed, developed, and elaborated; the database is then populated with events from the testbed, and the resulting graph is presented. Query commands are then presented as a means to examine and analyze network performance and relationships within the components of the network. Moreover, we detail the way by which this approach is used to study the impact of wireless communications on the physical processes and illustrate the impact of various wireless network parameters on the performance of the emulated manufacturing work cell. This approach can be deployed as a building block for various descriptive and predictive wireless analysis tools for CPS.

scholarly journals Performance Analysis of Interference-Aware Multi-Packet Reception Networks

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 665
Author(s):  
Antonio Furtado ◽  
Rodolfo Oliveira ◽  
Luis Bernardo ◽  
Rui Dinis
Keyword(s):  
Wireless Networks ◽  
Wireless Network ◽  
Communication Systems ◽  
Network Performance ◽  
Network Control ◽  
Wireless Communication Systems ◽  
Single Radio ◽  
Research Initiatives ◽  
Decentralized Wireless Networks ◽  
The Impact

Decentralized wireless networks are gaining increasing popularity as they do not need a fixed infrastructure. Simultaneously, multiple research initiatives have led to different findings at the PHY layer of the wireless communication systems, which include Multi-Packet Reception (MPR) techniques that enable a receiver to decode multiple packets that are transmitted simultaneously. However, the distributed nature of decentralized wireless networks demands different network control policies that should take into account the MPR capabilities to increase the network performance. This work studies the performance of a wireless network composed of multiple transmitters that are willing to transmit to a single receiver. This receiver has MPR capability and adopts an Energy-based Sensing (EBS) technique to enable uplink users’ transmissions without interfering with the ongoing transmissions from other transmitters. The first remark to be made is that the MPR technique performance depends on the channel propagation conditions and on the amount of time the receiver needs to detect the spectrum’s occupancy state. However, it is shown that by increasing the number of samples needed to increase the sensing accuracy, the receiver may degrade its throughput, namely if the receiver is equipped with a single radio, that is sequentially used for sensing and transmitting (split-phase operation). The results presented in the paper show the impact of the channel propagation condition and EBS parameterization on wireless network throughput and the cases where the receiver MPR capture performance is greatly improved by the use of a spectrum sensing technique.

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