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Research paper thumbnail of Dynamic Congestion Control Mechanism in Mobile Adhoc Network: TCP Westwood-DCC

International Journal of Recent Technology and Engineering (IJRTE), 2020

Transmission control protocol faces a problem of packet loss differentiation in the wireless and ... more Transmission control protocol faces a problem of packet loss differentiation in the wireless and mobile adhoc network. Congestion control is not properly done here. It cannot manage the congestion window as per type of loss and it reduces Congestion window unnecessarily and that degrades the performance. TCP Westwood cannot identify congestion or link failure loss, and it cannot manage the congestion window as per available bandwidth. This paper discusses that TCP Westwood performs bandwidth estimation, setting up a congestion window and a slow start threshold. In mobile adhoc network, link failure may happen frequently, and it should be handled properly. Link failure can be detected with the help of retransmission timeout. Once timeout occurs Westwood performs congestion avoidance. Proposed Westwood manages three states of congestion 1) Avoidance 2) congestion and 3) No congestion, it updates congestion window and slow start threshold as per the status of network. It maintains cong...

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Research paper thumbnail of International Journal of Recent Technology and Engineering (IJRTE)

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Research paper thumbnail of Congestion control in MANET by analyzing network status - New ETCP-Westwood

Zeichen Journal, 2020

Transmission control protocol provides congestion control mechanisms. These mechanisms work well ... more Transmission control protocol provides congestion control mechanisms. These mechanisms work well for mobile adhoc network and wireless networks. TCP provides different mechanisms for both networks. TCP suffers from the packet loss problem in both networks. TCP controls congestion as per type of loss. The mobile adhoc network faces two types of packet loss, 1) loss due to congestion 2) loss due to link failure. TCP can not identify these loss types and it assumes loss as congestion loss. It has existing variants which perform congestion control. One of TCP variant TCP westwood works for congestion control with the help of bandwidth estimation. It works well but has not taken care the value of last Round trip time and estimated round trip time which are the important parameters to analyze network status. The proposed westwood has taken care of these two parameters and controls congestion window based on them. The work proposed in this paper focuses utilization of round trip time for throughput improvement. The proposed algorithm is tested on NS 2.35 and compared with existing variants like TCP Reno, TCP Vegas and TCP westwood and result reveals certain improvements. Keywords: MANET (mobile adhoc network), cwnd (congestion window), ssthresh (slow start threshold), RTT (round trip time) ,RTO (retransmission time out) ,DCM (dynamic congestion control for MANET), ERTT (estimated round trip time)

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Research paper thumbnail of International Journal of Recent Technology and Engineering (IJRTE

International Journal of Recent Technology and Engineering (IJRTE) , 2020

 Abstract: Transmission control protocol faces a problem of packet loss differentiation in the w... more  Abstract: Transmission control protocol faces a problem of packet loss differentiation in the wireless and mobile adhoc network. Congestion control is not properly done here. It cannot manage the congestion window as per type of loss and it reduces Congestion window unnecessarily and that degrades the performance. TCP Westwood cannot identify congestion or link failure loss, and it cannot manage the congestion window as per available bandwidth. This paper discusses that TCP Westwood performs bandwidth estimation, setting up a congestion window and a slow start threshold. In mobile adhoc network, link failure may happen frequently, and it should be handled properly. Link failure can be detected with the help of retransmission timeout. Once timeout occurs Westwood performs congestion avoidance. Proposed Westwood manages three states of congestion 1) Avoidance 2) congestion and 3) No congestion, it updates congestion window and slow start threshold as per the status of network. It maintains congestion window dynamically. Network status is identified by estimated bandwidth and proportionality ratio. Proposed method is tested on NS2.35 and compared with the existing TCP variants. The proposed Westwood performs optimized link utilization and congestion control mechanism. Hence it gives significant performance for loss recovery.

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Research paper thumbnail of The Survey of Packet Loss Differentiation Techniques in TCP

Association for advancement in combinatorial science, 2018

In wireless network packet loss occurs due to congestion, Wireless channel error and link failure... more In wireless network packet loss occurs due to congestion, Wireless channel error and link failure. Here Transmission control protocol cannot respond the packet loss properly. It degrades its performance by presuming the loss due to congestion. So it has become important to find the reasons behind these losses for improvement in TCP's performance. Many researchers have worked in this area and evaluated algorithms which differentiate the cause of packet losses. This paper surveys about various techniques mitigate Packet Loss Differentiation as well as focuses on certain open areas for future research. Most of the surveyed reveals that researchers have worked for the congestion loss only, handful schemes cannot identify the link failure loss. The TCP's performance can be improved with proper loss recovery technique, suitable congestion avoidance scheme and there can be mechanism to switch between suitable Loss Recovery Algorithm (LRA) or congestion avoidance scheme automatically as per identified loss. 26

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Research paper thumbnail of Dynamic Congestion Control Mechanism in Mobile Adhoc Network: TCP Westwood-DCC

International Journal of Recent Technology and Engineering (IJRTE), 2020

Transmission control protocol faces a problem of packet loss differentiation in the wireless and ... more Transmission control protocol faces a problem of packet loss differentiation in the wireless and mobile adhoc network. Congestion control is not properly done here. It cannot manage the congestion window as per type of loss and it reduces Congestion window unnecessarily and that degrades the performance. TCP Westwood cannot identify congestion or link failure loss, and it cannot manage the congestion window as per available bandwidth. This paper discusses that TCP Westwood performs bandwidth estimation, setting up a congestion window and a slow start threshold. In mobile adhoc network, link failure may happen frequently, and it should be handled properly. Link failure can be detected with the help of retransmission timeout. Once timeout occurs Westwood performs congestion avoidance. Proposed Westwood manages three states of congestion 1) Avoidance 2) congestion and 3) No congestion, it updates congestion window and slow start threshold as per the status of network. It maintains cong...

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Research paper thumbnail of International Journal of Recent Technology and Engineering (IJRTE)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Congestion control in MANET by analyzing network status - New ETCP-Westwood

Zeichen Journal, 2020

Transmission control protocol provides congestion control mechanisms. These mechanisms work well ... more Transmission control protocol provides congestion control mechanisms. These mechanisms work well for mobile adhoc network and wireless networks. TCP provides different mechanisms for both networks. TCP suffers from the packet loss problem in both networks. TCP controls congestion as per type of loss. The mobile adhoc network faces two types of packet loss, 1) loss due to congestion 2) loss due to link failure. TCP can not identify these loss types and it assumes loss as congestion loss. It has existing variants which perform congestion control. One of TCP variant TCP westwood works for congestion control with the help of bandwidth estimation. It works well but has not taken care the value of last Round trip time and estimated round trip time which are the important parameters to analyze network status. The proposed westwood has taken care of these two parameters and controls congestion window based on them. The work proposed in this paper focuses utilization of round trip time for throughput improvement. The proposed algorithm is tested on NS 2.35 and compared with existing variants like TCP Reno, TCP Vegas and TCP westwood and result reveals certain improvements. Keywords: MANET (mobile adhoc network), cwnd (congestion window), ssthresh (slow start threshold), RTT (round trip time) ,RTO (retransmission time out) ,DCM (dynamic congestion control for MANET), ERTT (estimated round trip time)

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Research paper thumbnail of International Journal of Recent Technology and Engineering (IJRTE

International Journal of Recent Technology and Engineering (IJRTE) , 2020

 Abstract: Transmission control protocol faces a problem of packet loss differentiation in the w... more  Abstract: Transmission control protocol faces a problem of packet loss differentiation in the wireless and mobile adhoc network. Congestion control is not properly done here. It cannot manage the congestion window as per type of loss and it reduces Congestion window unnecessarily and that degrades the performance. TCP Westwood cannot identify congestion or link failure loss, and it cannot manage the congestion window as per available bandwidth. This paper discusses that TCP Westwood performs bandwidth estimation, setting up a congestion window and a slow start threshold. In mobile adhoc network, link failure may happen frequently, and it should be handled properly. Link failure can be detected with the help of retransmission timeout. Once timeout occurs Westwood performs congestion avoidance. Proposed Westwood manages three states of congestion 1) Avoidance 2) congestion and 3) No congestion, it updates congestion window and slow start threshold as per the status of network. It maintains congestion window dynamically. Network status is identified by estimated bandwidth and proportionality ratio. Proposed method is tested on NS2.35 and compared with the existing TCP variants. The proposed Westwood performs optimized link utilization and congestion control mechanism. Hence it gives significant performance for loss recovery.

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Research paper thumbnail of The Survey of Packet Loss Differentiation Techniques in TCP

Association for advancement in combinatorial science, 2018

In wireless network packet loss occurs due to congestion, Wireless channel error and link failure... more In wireless network packet loss occurs due to congestion, Wireless channel error and link failure. Here Transmission control protocol cannot respond the packet loss properly. It degrades its performance by presuming the loss due to congestion. So it has become important to find the reasons behind these losses for improvement in TCP's performance. Many researchers have worked in this area and evaluated algorithms which differentiate the cause of packet losses. This paper surveys about various techniques mitigate Packet Loss Differentiation as well as focuses on certain open areas for future research. Most of the surveyed reveals that researchers have worked for the congestion loss only, handful schemes cannot identify the link failure loss. The TCP's performance can be improved with proper loss recovery technique, suitable congestion avoidance scheme and there can be mechanism to switch between suitable Loss Recovery Algorithm (LRA) or congestion avoidance scheme automatically as per identified loss. 26

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