scholarly journals A QoS-Oriented Congestion Control Mechanism for Satellite Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Heyu Liu ◽  
Fuchun Sun
Keyword(s):  
Congestion Control ◽  
Data Flow ◽  
Control Mechanism ◽  
Satellite Networks ◽  
Satellite Network ◽  
Control Mechanisms ◽  
Network Congestion ◽  
Backbone Networks ◽  
Congestion Control Mechanism

The sharply increasing amount of data, which are transferred by the satellite network, requires the satellite network to provide quality-of-service (QoS). However, the upsurge in the data flow leads to the network congestion, impeding its ability to offer QoS. Congestion control mechanisms, deployed in the ground networks, have been thoroughly studied. But those deployed in the satellite networks have not been studied yet. As satellite networks are now important supplements to the ground backbone networks, this paper carefully analyzes the current challenges of developing the QoS-oriented congestion control mechanism for satellite networks. On this basis, a consequent mechanism QMCC (QoS-oriented mechanism of congestion control for satellite networks) is described in detail. Under that QMCC, the source nodes utilize an equation to compute the sending rate for each data flow; meanwhile, the intermediate nodes keep detecting real-time package-loss rates for timely adjustments. Simulation results indicate QMCC can provide superior congestion control performance, and raise network throughputs without reducing the QoS effects.

A Research of Network Congestion Control Based on Fuzzy PID Arithmetic

2011 ◽  
Vol 403-408 ◽  
pp. 266-269
Author(s):  
Hai Mei Wei
Keyword(s):  
Congestion Control ◽  
Control Mechanism ◽  
Active Queue Management ◽  
Queue Management ◽  
Network Congestion ◽  
Fuzzy Pid ◽  
Research Focus ◽  
Data Packets ◽  
Congestion Control Mechanism ◽  
New Research

This paper first introduces definition and cause for congestion control as well as TCP/IP congestion control mechanism, focusing on introducing active queue management arithmetic in IP congestion control mechanism, and points out its important function in congestion control. The method of active queue management arithmetic which solves full queue of routers is dropping arrived data packets before the queue is full so that end-note is able to respond before the queue overflows, avoiding the actual occurrence of congestion. RED arithmetic is a famous AQM arithmetic and congestion control based on control theory has become a new research focus.

Research of Hybrid Congestion Control Mechanism

2012 ◽  
Vol 426 ◽  
pp. 275-278
Author(s):  
Cheng Yu Lai ◽  
Xiao Guang Fu
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Congestion Control ◽  
Energy Saving ◽  
Control Mechanism ◽  
Wireless Sensor ◽  
Forward Rate ◽  
Control Mechanisms ◽  
Channel Quality ◽  
Congestion Control Mechanism

In wireless sensor networks, congestion causes overall channel quality to degrade and loss rates to raise, leads to buffer drops and increased delays, and tends to be grossly unfair toward nodes whose data has to traverse a larger number of radio hops. Hybrid congestion control mechanisms relieve the congestion by creating the new path; when establishment of a new path is failed, fairness aggregate mechanisms limits forward rate, ensures that each source node sends data fairly. Based on energy-saving, algorithms for mild congestion have been improved.

Congestion Control in Data Center Networks: A Survey and New Perspectives

2013 ◽  
Vol 462-463 ◽  
pp. 1028-1035
Author(s):  
Hang Xing Wu ◽  
Xiao Long Yang ◽  
Min Zhang
Keyword(s):  
Congestion Control ◽  
Data Center ◽  
Data Centers ◽  
Web Applications ◽  
Control Mechanism ◽  
Control Mechanisms ◽  
Data Center Networks ◽  
Huge Amount ◽  
Advantages And Disadvantages ◽  
Congestion Control Mechanism

Nowadays data centers have been becoming increasingly important for various web applications, huge amount of cost is invested to maintain good performance of data center. Whereas some studies indicated that TCP Incast phenomenon was widely observed in most of data centers, which results in congestion in data centers and damages the performance of data center greatly. Thus some congestion control mechanisms for data center have been proposed to solve the problems. These mechanisms are categorized and described in this paper, and the advantages and disadvantages of these mechanisms are analyzed. Subsequently, some new interesting topics which may be worthy of further study in congestion control mechanism on data center are presented.

Downlink Congestion Control for TD-SCDMA Trunking System

2011 ◽  
Vol 130-134 ◽  
pp. 3247-3250
Author(s):  
Ting Jian Zhang ◽  
Mei Juan Chen ◽  
Shi Xiang Shao
Keyword(s):  
Congestion Control ◽  
Control Mechanism ◽  
Mode Selection ◽  
System Level ◽  
User Mobility ◽  
System Level Simulation ◽  
Imperfect Power Control ◽  
Congestion Control Mechanism ◽  
And Performance

In TD-SCDMA trunking system, imperfect power control and user mobility are disadvantages for the capacity and performance of the system. In order to meet the requested Quality of Service (QoS) of group users, in this paper, we introduce a congestion control mechanism in downlink for TD-SCDMA trunking system. The mechanism is based on Adaptive Multi-Rate (AMR) mode selection and interrupt connections of users, analyzed in detail and verified by using MATLAB to structure a dynamic system level simulation platform. The simulation results reveal that system performance can be significantly improved.

scholarly journals Analisis Kualitas VoIP pada SCTP Menggunakan ECN dan AQM

2015 ◽  
Vol 9 (2) ◽  
pp. 121
Author(s):  
La Surimi ◽  
Reza Pulungan
Keyword(s):  
Congestion Control ◽  
Real Time ◽  
Control Mechanism ◽  
Data Transfer ◽  
Reliable Data ◽  
Network Simulator ◽  
Independent Replication ◽  
Congestion Control Mechanism ◽  
Replication Technique

AbstrakVoIP merupakan aplikasi real time yang kualitasnya sangat tergantung pada delay dan jitter, yang mana hal ini sulit dipenuhi oleh protokol yang bersifat reliable dan memiliki congestion control seperti TCP. Di sisi lain penggunaan UDP yang tidak memiliki congestion control menyebabkan peluang terjadinya congestion pada jaringan sangat besar. Penggunaan SCTP sebagai protokol alternatif juga belum mampu mengakomodasi kekurangan TCP dan UDP. Beberapa hasil penelitian menunjukkan perlu adanya perbaikan ataupun modifikasi pada mekanisme congestion control yang dimiliki oleh SCTP. Penggunaan mekanisme ECN dan AQM  pada beberapa penelitian menunjukkan bahwa kedua mekanisme ini dapat menurunkan delay dan jitter. Penelitian ini melakukan pengujian terhadap kualitas VoIP di atas SCTP yang menggunakan ECN dan AVQ pada network simulator NS2. Hasil simulasi menunjukkan bahwa penggunaan mekanisme ECN dan AVQ pada protokol SCTP menghasilkan kualitas VoIP yang lebih baik pada kondisi jaringan yang tidak ideal (high Latency low Bandwidth dan low Latency low Bandwidth dari pada penggunaan protokol SCTP tanpa menggunakan mekanisme ECN dan AVQ. Penelitian ini juga melakukan perbandingan nilai MOS panggilan VoIP SCTP yang menggunakan ECN dan AVQ dengan nilai MOS panggilan VoIP yang menggunakan protokol TCP dan UDP. Hasilnya SCTP dengan ECN dan AVQ mengungguli TCP namun belum dapat mengungguli UDP. Kata kunci— VoIP, SCTP, ECN, AQM,AVQ. AbstractVoIP is the real time applications that are highly dependent on the quality of  delay and jitter, which it is difficult to be met by protocol that has reliable data transfer feature and  congestion control such as TCP. On the other hand the use of UDP that has no congestion control make chance of causing congestion in the network is very large. The use of SCTP as an alternative protocol was also not able to accommodate the weaknesses of TCP and UDP. Some research shows that repairs or modifications to the SCTP congestion control mechanism is needed.The Use of ECN and AQM in some studies show that these two mechanisms can reduce delay and jitter. This study tested the quality of VoIP over SCTP with ECN and AVQ, in NS2. Simulations carried out by independent replication technique, and the results showed that ECN and AVQ can increase the value of MOS VoIP calls significantly in non ideal network scenarios. This study also did comparison of SCTP MOS that uses ECN and AVQ with MOS values VoIP using TCP and UDP. The result showed that SCTP with ECN and AVQ outperform TCP but can not surpass UDP yet. Keywords— VoIP, SCTP, ECN, AQM,AVQ. 

scholarly journals Two-Level Congestion Control Mechanism (2LCCM) for Information-Centric Networking

2021 ◽  
Vol 13 (6) ◽  
pp. 149
Author(s):  
Yaqin Song ◽  
Hong Ni ◽  
Xiaoyong Zhu
Keyword(s):  
Congestion Control ◽  
Data Transmission ◽  
Network Architecture ◽  
Control Algorithm ◽  
Control Mechanism ◽  
Transmission Rate ◽  
Control Mechanisms ◽  
Information Centric Networking ◽  
Congestion Control Algorithm ◽  
Congestion Control Mechanism

As an emerging network architecture, Information-Centric Networking (ICN) is considered to have the potential to meet the new requirements of the Fifth Generation (5G) networks. ICN uses a name decoupled from location to identify content, supports the in-network caching technology, and adopts a receiver-driven model for data transmission. Existing ICN congestion control mechanisms usually first select a nearby replica by opportunistic cache-hits and then insist on adjusting the transmission rate regardless of the congestion state, which cannot fully utilize the characteristics of ICN to improve the performance of data transmission. To solve this problem, this paper proposes a two-level congestion control mechanism, called 2LCCM. It switches the replica location based on a node state table to avoid congestion paths when heavy congestion happens. This 2LCCM mechanism also uses a receiver-driven congestion control algorithm to adjust the request sending rate, in order to avoid link congestion under light congestion. In this paper, the design and implementation of the proposed mechanism are described in detail, and the experimental results show that 2LCCM can effectively reduce the transmission delay when heavy congestion occurs, and the bandwidth-delay product-based congestion control algorithm has better transmission performance compared with a loss-based algorithm.

scholarly journals Low Latency Live Streaming System with Congestion Control

2021 ◽  
Vol 9 (1) ◽  
pp. 8-13
Author(s):  
Toya Kinoshita ◽  
◽  
Hiroyuki Hisamatsu
Keyword(s):  
Congestion Control ◽  
Transmission Rate ◽  
Video Quality ◽  
Low Latency ◽  
Live Streaming ◽  
Network Congestion ◽  
Available Bandwidth ◽  
Congestion Control Mechanism ◽  
The Web

In recent years, the traffic for live streaming on the web has been increasing. The current live streaming methods that use MPEG-DASH or HLS are simple and scale easily to many clients using HTTP. However, they do not take into account the communication between the distributor and the viewer. As a result, latency between the distributor and the viewer is relatively high. Therefore, in this paper, we propose a low latency live streaming system on the web using WebRTC. Since WebRTC uses UDP, it does not have a congestion control mechanism. Depending on the network congestion, it is possible to stream video with quality that exceeds the available bandwidth. Therefore, we propose a system to change the video quality based on the congestion status. The proposed system increases or decreases the video transfer rate by changing the quality of the streamed video depending on the network conditions. We have evaluated the proposed system in a real network environment. As a result, we showed that the delay of the proposed system is smaller than that of the MPEG-DASH system. We also showed that the proposed system can change the quality of the video and switch the transmission rate appropriately according to the network conditions.

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