Fast recovery of TCP congestion window on a backup 3G path for MPTCP via occasional probing

2015 ◽  
pp. 163-165
Author(s):  
Byoungkwan Kim ◽  
Sunghyun Im ◽  
Seung Park ◽  
Ju Jang
Keyword(s):  
Fast Recovery ◽  
Congestion Window

scholarly journals Enhanced Multistream Fast TCP: Rapid Bandwidth Utilization after Fast-Recovery Phase

2019 ◽  
Vol 9 (21) ◽  
pp. 4698
Author(s):  
Sarfraz Ahmad ◽  
Muhammad Junaid Arshad
Keyword(s):  
Congestion Control ◽  
High Speed ◽  
Recovery Phase ◽  
Transport Layer ◽  
Convergence Time ◽  
Transmission Protocol ◽  
Fast Recovery ◽  
Congestion Window ◽  
Fast Tcp ◽  
Network Bandwidth

The purpose of this study is to enhance the performance of Multistream Fast Transmission Control Protocol (TCP) keeping in view the recent web-based applications that are being deployed on long-range, high-speed, and high-bandwidth networks. To achieve the objective of the research study, a congestion control after fast-recovery module for congestion control scheme of Multistream Fast TCP is proposed. The module optimized the performance of the protocol by reducing the time that is required to consume the available bandwidth after a fast-recovery phase. The module is designed after studying additive-increase, multiplicative-decrease and rate-based congestion window management schemes of related transport protocols. The module adjusts the congestion window on receipt of each individual acknowledgment instead of each round trip time after the fast-recovery phase until it consumes vacant bandwidth of the network link. The module is implemented by using Network Simulator 2. Convergence time, throughput, fairness index, and goodput are the parameters used to assess the performance of proposed module. The results indicate that Enhanced Multistream Fast TCP with congestion control after fast recovery recovers its congestion window in a shorter time period as compared to multistream Fast TCP, Fast TCP, TCP New Reno, and Stream Control Transmission Protocol. Consequently, Enhanced Multistream Fast TCP consumes the available network bandwidth in lesser time and increases the throughput and goodput. The proposed module enhanced the performance of the transport layer protocol. Our findings demonstrate the performance impact in the form of a decrease in the convergence time to consume the available network bandwidth and the increase in the throughput and the goodput.

Improving Westwood over Bandwidth Instability

2014 ◽  
Vol 926-930 ◽  
pp. 1947-1952
Author(s):  
Ming Kun Wang ◽  
Wei Zhang
Keyword(s):  
Wireless Networks ◽  
Mobile Networks ◽  
Control Algorithm ◽  
Estimation Algorithm ◽  
Node Mobility ◽  
Fast Recovery ◽  
Congestion Window ◽  
Congestion Control Algorithm ◽  
High Bandwidth ◽  
Lossy Links

The design of TCP/IP is the key of the success of Internet. Due to the network considered as a “black box”, the congestion control algorithm becomes the most important part of TCP. TCP Westwood provides an eligible rate estimation algorithm that improves upon the performance of TCP Reno in wired as well as wireless networks. The improvement is most significant in wireless networks with lossy links. In mobile communication, due to the node mobility, the bandwidth shifting requires higher demands to QoS. In mobile networks with high bandwidth, such as 3G/LTE, the bandwidth will shift rapidly in different positions. We call this bandwidth instability, which is the cause of the degradation of performance. However, Westwood TCP or the other popular TCP cannot response quickly to this situation. In this paper, we verify the problem mentioned above of varied TCP protocols. After that, we propose an improved fast recovery mechanism based on Westwood TCP. The new mechanism can adjust the congestion window in time when the bandwidth shifts.

STOCHASTIC DIFFERENTIAL EQUATION FOR TCP WINDOW SIZE: ANALYSIS AND EXPERIMENTAL VALIDATION

2004 ◽  
Vol 18 (1) ◽  
pp. 111-140 ◽  
Author(s):  
A. Budhiraja ◽  
F. Hernández-Campos ◽  
V. G. Kulkarni ◽  
F. D. Smith
Keyword(s):  
Differential Equation ◽  
Stochastic Differential Equation ◽  
Experimental Validation ◽  
Boundary Behavior ◽  
Window Size ◽  
Size Analysis ◽  
Fast Recovery ◽  
Congestion Window ◽  
Packet Losses ◽  
Model Predictions

In this paper we develop a stochastic differential equation to describe the dynamic evolution of the congestion window size of a single TCP session over a network. The model takes into account recovery from packet losses with both fast recovery and time-outs, boundary behavior at zero and maximum window size, and slow-start after time-outs. We solve the differential equation to derive the distribution of the window size in steady state. We compare the model predictions with the output from the NS simulator.

Fluorine-19 Fast Recovery Fast Spin Echo Imaging for Mapping 5-Fluorouracil

2007 ◽  
Vol 6 (4) ◽  
pp. 235-240 ◽  
Author(s):  
Shigehiro MORIKAWA ◽  
Toshiro INUBUSHI ◽  
Masahito MORITA ◽  
Koichiro MURAKAMI ◽  
Chiaki MASUDA ◽  
...  
Keyword(s):  
Spin Echo ◽  
Fast Spin Echo ◽  
Fast Recovery ◽  
Fast Spin

CuO nanoparticle loaded ZnO hierarchical heterostructure to boost H2S sensing with fast recovery

2021 ◽  
pp. 129806
Author(s):  
Hong Wang ◽  
Yuanyuan Luo ◽  
Bo Liu ◽  
Lei Gao ◽  
Guotao Duan
Keyword(s):  
Fast Recovery ◽  
Cuo Nanoparticle

scholarly journals Heat-tolerant hot pepper exhibits constant photosynthesis via increased transpiration rate, high proline content and fast recovery in heat stress condition

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sherzod Nigmatullayevich Rajametov ◽  
Eun Young Yang ◽  
Myeong Cheoul Cho ◽  
Soo Young Chae ◽  
Hyo Bong Jeong ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Heat Stress ◽  
Heat Tolerance ◽  
Transpiration Rate ◽  
Stress Condition ◽  
Proline Content ◽  
Hot Pepper ◽  
Fast Recovery ◽  
Heat Stress Condition ◽  
Heat Tolerant

AbstractUnderstanding the mechanism for heat tolerance is important for the hot pepper breeding program to develop heat-tolerant cultivars in changing climate. This study was conducted to investigate physiological and biochemical parameters related to heat tolerance and to determine leaf heat damage levels critical for selecting heat-tolerant genotypes. Seedlings of two commercial cultivars, heat-tolerant ‘NW Bigarim’ (NB) and susceptible ‘Chyung Yang’ (CY), were grown in 42 °C for ten days. Photosynthesis, electrolyte conductivity, proline content were measured among seedlings during heat treatment. Photosynthetic rate was significantly reduced in ‘CY’ but not in ‘NB’ seedlings in 42 °C. Stomatal conductivity and transpiration rate was significantly higher in ‘NB’ than ‘CY’. Proline content was also significantly higher in ‘NB’. After heat treatment, leaf heat damages were determined as 0, 25, 50 and 75% and plants with different leaf heat damages were moved to a glasshouse (30–32/22–24 °C in day/night). The growth and developmental parameters were investigated until 70 days. ‘NB’ was significantly affected by leaf heat damages only in fruit yield while ‘CY’ was in fruit set, number and yield. ‘NB’ showed fast recovery after heat stress compared to ‘CY’. These results suggest that constant photosynthetic rate via increased transpiration rate as well as high proline content in heat stress condition confer faster recovery from heat damage of heat-tolerant cultivars in seedlings stages.

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