Dynamic Aggregation Mechanism for Efficient Transmission of H.264/ SVC Video Over IEEE 802.11n WLANs

2019 ◽  
Vol 12 (2) ◽  
pp. 135-141
Author(s):  
Dharm Singh Jat ◽  
Lal Chand Bishnoi ◽  
Shoopala Nambahu
Keyword(s):  
Video Transmission ◽  
Quality Measurement ◽  
Local Area ◽  
Video Data ◽  
Network Simulator ◽  
Medium Access ◽  
Ieee 802.11N ◽  
Aggregation Mechanism ◽  
Digital Devices

Background: In just last two-years most of the world’s video data has been created by the digital devices like smartphone, surveillance cameras, and wireless sensor networks. These days the IEEE 802.11n enabled devices for Wireless Local Area Networks (WLANs) are being used to achieve higher throughput at the Medium Access Control (MAC) layer. </p><p> Methods: In this research, the Dynamic Aggregation Mechanism (DAM) algorithm is proposed for H.264/SVC video transmission over IEEE 802.11n WLANs. The modified Network Simulator (NS2) was used to examine the quality of received H.264/SVC video over 802.11n WLAN. For quality measurement, PSNR was used for all nine H.264/SVC video traffic. </p><p> Results: The proposed mechanism improved the PSNR for received video.

scholarly journals QoS Analysis of Video Streaming in the UAV Networks with WiFi Standards

2021 ◽  
Vol 24 (4) ◽  
pp. 73-79
Author(s):  
Kirill Eduardovich Korepanov ◽  
Irina Alekseevna Kaisina ◽  
Roman Eduardovich Shibanov ◽  
Albert Vinerovich Abilov ◽  
Mohammed Amin Lamri
Keyword(s):  
Data Transmission ◽  
Transmission Rate ◽  
Video Stream ◽  
Video Data ◽  
Network Simulator ◽  
Coding Schemes ◽  
Ground Station ◽  
Transmission Parameters ◽  
Aerial Vehicle

The paper presents the results of simulation of the process of video data transmission from an unmanned aerial vehicle (UAV) to a ground station using the IEEE 802.11 family standards (802.11n, 802.11ac and 802.11ax), with the ability to change modulation indices, coding schemes and data transfer rate in a network simulator NS-3. The aim of the work is to analyze the characteristics of the quality of video data transmission in the UAV network for various Wi-Fi standards, which allows determining the most suitable standard for the transmission of video data in the UAV network, depending on the distances between nodes and the required frequency band. A scenario is considered in which an unmanned aerial vehicle (UAV) hovering in the air was transmitting a video stream to a ground station, while the distance between nodes increased, and the transmission rate was maintained at the same level close to the transmission rate of the real video stream. The simulation was carried out in several stages for a more detailed study of the dependence of the packet loss of the transmitted data on the change in modulation indices, coding schemes and other parameters. Based on the simulation results, the characteristics of the video data transmission quality were obtained as a relation between the Packet delivery rate (PDR) and distance between nodes for different transmission parameters for each considered standard of the IEEE 802.11 family. Based on the results obtained, conclusions were drawn about the influence of transmission parameters on the quality of service characteristics. The study was carried out in an open-source network simulator NS-3, which implements build-in libraries that are necessary for high-quality simulation of data streaming transmission and allows you to set a wide range of parameters to obtain realistic results. The results of the work may be of interest to UAV manufacturers when planning missions in which the choice of Wi-Fi standard used as a channel for transmitting video data is crucial.

scholarly journals Παροχή ποιότητας υπηρεσιών σε ασύρματα τοπικά δίκτυα πολυμέσων τεχνολογίας ΙΕΕΕ 802.11e

2011 ◽  
Author(s):  
Αναστάσιος Πολίτης
Keyword(s):  
Ieee 802.11 ◽  
Local Area ◽  
Multimedia Applications ◽  
Ieee 802.11E ◽  
Medium Access ◽  
Large Numbers ◽  
Integrated Architecture ◽  
Wireless Infrastructure ◽  
Networking Technology

The fast growth of Wireless Local Area Networks (WLANs) during the last decade, has led to their wide acceptance by the vast majority of electronic equipment users as the dominant wireless networking technology. The indisputable functionality standard of WLANs is the IEEE 802.11. At the same time, multimedia applications technology has received a similar success. It was, therefore, an expected result that the users of both technologies required that multimedia applications were adequately supported by the wireless infrastructure. Towards this direction, the IEEE has published a series of amendments to the initial WLAN standard. The widely accepted amendment for supporting multimedia in WLANs is the IEEE 802.11e. This specification defined the functionality of a new Medium Access Control (MAC), capable of providing Quality of Service (QoS) to applications with high demands from the network.However, the IEEE 802.11 has received negative reviews regarding its capability of multimedia support in highly congested wireless networks. These conditions are quite common, especially in infrastructure networks with large numbers of users (e.g., public hotspots, university networks etc.). As a response to this challenge, the international scientific community, has designed and proposed various enhancements mechanisms to improve the IEEE 802.11e functionality in high load situations.This thesis contributes to this international effort of QoS provisioning in multimedia WLANs, by developing and assessing a novel mechanism which combines, adapts and enforces the characteristics and the design techniques that have been proposed in the international bibliography, into an integrated architecture. The efficiency of the mechanism is evaluated and compared to other implementations, and the related experimental results are proven to be very promising.

Enhanced Distributed Coordination Function of MAC for VoIP Services Using IEEE802.11 Networks

2012 ◽  
Vol 433-440 ◽  
pp. 2304-2309
Author(s):  
B. Suvarna Vignan ◽  
B. Lalu Naick
Keyword(s):  
Mac Protocol ◽  
Local Area ◽  
Contention Window ◽  
Collision Probability ◽  
Network Simulator ◽  
Distributed Coordination ◽  
Medium Access ◽  
Packet Collision ◽  
Distributed Coordination Function ◽  
Coordination Function

Voice over Internet Protocol (VoIP) is an important service with strict Quality-of-Service (QoS) requirements with in wireless local area networks. The popular Distributed Coordination Function (DCF) of IEEE802.11 Medium Access Control (MAC) protocol adopts Multiplicative Increase and linear Decrease procedure to reduce the packet collision probability in WLANs. In DCF, the size of contention window is doubled upon a collision regardless of the network loads. This paper presents an enhanced DCF scheme to improve the QoS of VoIP in WLANs. This scheme applies a threshold of the collision rate to switch between two different functions for increasing the size of contention window based on the status of network loads. The performance of this scheme investigated and compared to the original DCF using the network simulator NS-2. Under the high traffic loads the packet loss probability decreases with the enhanced DCF compared to the original DCF. Some other parameters like throughput and access delay is decreased with the enhanced DCF.

scholarly journals Investigation and Evaluation of IEEE 802.11n WLANs Link Features Performance Under Single Host and Concurrent Communication

2021 ◽  
Vol 11 (1) ◽  
pp. 1-13
Author(s):  
Sumon Kumar Debnath ◽  
Prodip Kumar Sarker ◽  
Md. Manowarul Islam ◽  
Ileas Pramanik
Keyword(s):  
High Performance ◽  
Single Channel ◽  
Access Point ◽  
Local Area ◽  
Practical Implementation ◽  
Network Simulator ◽  
Data Traffic ◽  
Efficient Design ◽  
Ieee 802.11N ◽  
Simulation Tools

For an efficient design of wireless local-area networks (WLANs), the simulation tools are important to accurately estimate the IEEE 802.11n/ac link features for WLANs. However, this true simulation of network behavior is critical in designing high-performance WLANs. Through testing, analysis, and modeling of the proposed scheme repetitively, the design of the WLAN can be enhanced with a small budget before making its practical implementation. Many network simulation tools have been established to give solutions for this request and ns-3 is the most widely used tools among them by the research industry as an open-source network simulator. In this paper, we examine the various link features of the 802.11n WLANs under several conditions. We investigate the effects of 802.11n WLAN modulation and coding schemes (MCSs), 20MHz single channel or 40 MHz bonded channel, guard intervals (GI), frame aggregation, data encoding, number of antennas and their data rate, and link distance features of 802.11n WLAN in ns-3 when only a unique host connects with the access point (AP) and generates data traffic. Besides, the performance for an enterprise scenario proposed by the IEEE 802.11ax study group is evaluated when several hosts are simultaneously creating traffic with their associated APs. The results demonstrate that ns-3 support most of the link features of the 802.11n protocol with significant accuracy.

scholarly journals QoS-Based Two-Level user Scheduling Scheme for MU-MIMO Wireless LANs

2019 ◽  
Vol 9 (1S3) ◽  
pp. 32-39
Keyword(s):  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
User Scheduling ◽  
Medium Access ◽  
Frequency Selective Fading ◽  
High Data ◽  
Rate Transmission ◽  
Data Rate Transmission

The advances in physical layer technology has led to the performance upgradation of wireless local area networks (WLANs). More recently, multi-input multi-output (MIMO) is considered to be a key technology to enable high data rate transmission in WLANs. However, the actual benefit of this approach can be utilized, if there is an appropriate mechanism to select and schedule the users. Also, providing Quality of Service (QoS) support to user demands has become a major task in WLANs. In this paper, a two-level user scheduling approach for WLANs is discussed and its performance is evaluated using high-transmission rates with the assumption of frequency selective fading. For the purpose of comparison, some well-known medium access control (MAC) scheduling schemes are considered. It is shown that, the proposed scheme enhances throughput and achieves fairness among the users. Further, this scheme can be used to reduce contention during the acquisition of channel feedback.

scholarly journals Latency and Jitter Analysis for IEEE 802.11e Wireless LANs

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Sungkwan Youm ◽  
Eui-Jik Kim
Keyword(s):  
Local Area ◽  
Ieee 802.11E ◽  
Distributed Coordination ◽  
Mac Layer ◽  
Medium Access ◽  
Distributed Coordination Function ◽  
Packet Latency ◽  
Coordination Function ◽  
The Voice

This paper presents a numerical analysis of latency and jitter for IEEE 802.11e wireless local area networks (WLANs) in a saturation condition, by using a Markov model. We use this model to explicate how the enhanced distributed coordination function (EDCF) differentiates classes of service and to characterize the probability distribution of the medium access control (MAC) layer packet latency and jitter, on which the quality of the voice over Internet protocol (VoIP) calls is dependent. From the proposed analytic model, we can estimate the available number of nodes determining the system performance, in order to satisfy user demands on the latency and jitter.

scholarly journals Improving WLAN Quality of Services (Qos) Using Opnet

2016 ◽  
Vol 9 (3) ◽  
pp. 204-211
Author(s):  
Ishwar Baidari ◽  
S. P. Sajjan ◽  
Ajeet Singh
Keyword(s):  
Ieee 802.11 ◽  
Local Area Networks ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Ieee 802.11E ◽  
Distributed Coordination ◽  
Medium Access ◽  
Access Delay ◽  
Coordination Function

Wireless local area networks (WLANs) are in a period of great expansion and there is a strong need for them to support multimedia applications. With the increasing demand and penetration of wireless services, users of wireless networks now expect Quality of Service (QoS) and performance comparable to what is available from fixed networks. Providing QoS requirements like good throughput and minimum access delay are challenging tasks with regard to 802.11 WLAN protocols and Medium Access Control (MAC) functions. This research is done to study, the presently implemented schemes (the Point Coordination Function (PCF) of IEEE 802.11, the Enhanced Distributed Coordination Function (EDCF) of the proposed IEEE 802.11e extension to IEEE 802.11), solves these issues and what can be done to improve them further. The metrics used were Throughput, Data Drop, Retransmission and Medium Access Delay, to analyze the performance of various MAC protocols in providing QoS to users of WLAN. Two scenarios, with same Physical and MAC parameters, one implementing the DCF and other EDCF, were created in the network simulation tool (OPNET MODELER) to obtain the results. The results showed that the performance of EDCF was better in providing QoS for real-time interactive services (like video conferencing) as compared to DCF, because of its ability to differentiate and prioritize various services. Index Terms - Wireless local area networks (WLANs),

scholarly journals Enhancement of QoS in 802.11e for Real Time Traffic

2010 ◽  
Vol 1 (1) ◽  
pp. 123-133
Author(s):  
Gurpreet Singh Grewal ◽  
Rajbir Singh ◽  
Manpreet Singh
Keyword(s):  
Quality Of Service ◽  
Access Control ◽  
Real Time ◽  
Network Simulator ◽  
Medium Access ◽  
Real Time Traffic ◽  
Access Scheme ◽  
Challenging Tasks ◽  
802.11 Wlan

“Quality of Service (QoS) requirements like good throughput and minimum access delay are challenging tasks to accomplish with regard to 802.11 WLAN protocols and Medium Access Control (MAC) functions. In this article, a distributed medium access scheme called EDCF, which is adopted in an upcoming standard IEEE802.11e to allow prioritized medium access for applications with QoS requirements, is described and discussed. Its performance is also evaluated via simulations using network simulator called OPNET”

A Framework for Evaluation of Video Quality of Service in Wireless Networks

2017 ◽  
pp. 1-29
Author(s):  
Dharm Singh ◽  
Lal Chand Bishnoi
Keyword(s):  
Wireless Networks ◽  
Quality Of Service ◽  
Video Transmission ◽  
Video Quality ◽  
Measuring Technique ◽  
New Techniques ◽  
Ieee 802.11N ◽  
Transmission Quality ◽  
Video Transmission Quality

Today's IEEE 802.11n WLAN are capable of delivering the essential bandwidth for video by using MPEG-4 or H.264 codec compression. However, 802.11n devices are popular for delivering wireless video transmission. Even though there are some challenges for these devices specifically severe network congestion that degrade the quality of video transmission. For assessing the video transmission quality during a simulation on 802.11n WLAN technology, we extended a framework and toolset (802.11nMyEvalVid) which can be used to measures the QoS constraints in wireless networks, such as throughput, delays, and end-to-end delay. However, it also supports PSNR, which is a received video quality measuring technique based on a comparison of frame-by-frame. This chapter focused on a framework 802.11nMyEvalVid that can be used for research and evaluating new techniques for MAC-layer optimizations for simulating MPEG-4, H.264/AVC and H.264/SVC video over 802.11n WLAN in a more efficient and reliable way.

scholarly journals QoS-based Joint User Selection and Scheduling for MU-MIMO WLANs

2017 ◽  
Vol 4 ◽  
pp. 17-24
Author(s):  
Dasari Srinivasa Rao ◽  
Victor Dhason Berlin Hency
Keyword(s):  
Multiple Input Multiple Output ◽  
Local Area ◽  
Performance Comparison ◽  
User Selection ◽  
User Scheduling ◽  
Medium Access ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Csi Feedback

The shift in Multi-User Multiple Input Multiple Output (MU-MIMO) has gained attention due to its wide support in very high throughput Wireless Local Area Networks (WLANs) such as the 802.11ac. However, the full advantage of MU-MIMO can be utilized only with proper user selection and scheduling. Also, providing Quality of Service (QoS) support is a major challenge for these wireless networks. Generally, user scheduling is done with the acquisition of Channel State Information (CSI) from all the users. In MU-MIMO based WLANs, the number of CSI request increases with the number of users. This results in an increased CSI overhead and in degradation of the overall throughput. Most of the proposals in the literature have not addressed the contention in the CSI feedback clearly. Hence, in this paper a Joint User Selection and Scheduling (JUSS) scheme is discussed and its performance is evaluated in terms of throughput, delay, packet loss and fairness. In the performance comparison some wellknown Medium Access Control (MAC) protocols are considered. The proposed scheme not only enhances throughput, but also avoids contention during CSI feedback period.

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