Experimental and Comparative Analysis of Channel Delay Impact on Rate-Based and Window-Based Transmission Mechanisms over Space-Internet Links

Wang, Ruhai; Hsu, Wei Tai; Wu, Xuan; Wang, Tiaotiao; Wang, Xinbing

doi:10.1109/icc.2008.563

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…One of the major problems in a satellite-based network is the random packet errors, which are not common in the wired counterpart [30], [31], [32]. The RTT is constrained by the speed of light and the total amount of data that needs to be sent in one RTT is given by the bandwidth-delay product of the link concerned and is not really achieved by the acknowledgement driven logic of TCP [1], [3], [6]. Moreover, there are problems because of bandwidth asymmetry and intermittency of the link.…”

Section: Introductionmentioning

confidence: 99%

Simulation based analysis of RTT with PER, Buffer Size and Congestion Levels for Satellite based Networks

Sarkar¹,

Shukla²,

Dasgupta³

2012

IJCA

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Round Trip Time values constitute one of the significant parameter available to a TCP sender for estimating the network conditions. The RTT has a significant effect on the throughput of a connection and creates the performance bottleneck for traditional AIMD TCP Protocol variants mainly when used for GEO satellite networks and other long fat networks. Many Transport Protocols like Vegas, Proactive TCP, and Westwood uses the RTT measurement for adjusting the congestion window and refining the Loss Detection Algorithms, which eventually determines the performance of the Protocol. RTT also appears in the empirical formulation of TCP throughput and protocols based on these empirical estimates. RTT is generally considered an independent parameter mainly dependent on the access delay, queuing delay, and the propagation delay of the concerned channel. In this paper, we have analyzed the dynamics of RTT behavior and shown how the congestion levels in the network, packet error rates and available buffer capacity affects the RTT measurements. The Mean RTT and the rate of change of RTT Mean values have been analyzed in different network conditions. These analysis have been carried out by simulation using ns2 considering a GEO Satellite network. General TermsTCP Vegas, Proactive TCP, RTT, GEO, RTT Mean, ns2

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Section: Introductionmentioning

confidence: 99%

Simulation based analysis of RTT with PER, Buffer Size and Congestion Levels for Satellite based Networks

Sarkar¹,

Shukla²,

Dasgupta³

2012

IJCA

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“…These include choice of modulation technique, transmission and reception efficiency of the transmitter, and the receiver concerned, the distance at which they communicate, the size of antennas etc. Therefore, we have not considered those parameters as they vary from the way missions are designed to operate [24,25]. Here, the term bandwidth means the actual bandwidth available to the transmitter after the application of FEC so that our analysis of the transport protocol can be done independently of the way the RF communication is planned.…”

Section: Rtt Independence Characteristicsmentioning

confidence: 99%

“…The logic for this approach is that if redundancy is added to all the packets there will be wastage in the bandwidth when the packet error rate is less. Moreover, considering the powerful FEC codes available, generally the system is designed to work at a fairly good BER [24,25]. In that case adding redundancy to all packets may not be that advantageous.…”

Section: Adaptive Redundant Retransmission Techniquementioning

confidence: 99%

Delay Resistant Transport Protocol for Deep Space Communication

Sarkar¹,

Shukla

Dasgupta³

2011

IJCNS

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The throughput of conventional transport protocols suffers significant degradation with the increased Round Trip Time (RTT) typically seen in deep space communication. This paper proposes a Delay Resistant Transport Protocol (DR-TCP) for point-to-point communication in deep space exploration missions. The issues related to deep space communication protocol design and the areas where modifications are necessary are investigated, and a protocol is designed that can provide good throughput to the applications using a deep space link. The proposed protocol uses a cross layer based approach to find the allocated bandwidth and avoids initial bandwidth estimation. A novel timeout algorithm estimates the timeout duration with an objective to maximize throughput and avoid spurious timeout events. The protocol is evaluated through extensive simulations in ns2 considering high RTT values typically seen in Lunar and Mars Exploration Networks under different conditions of packet error rates. DR-TCP provides a significant increase in the throughput as compared to traditional transport protocols under the same conditions. A novel adaptive redundant retransmission algorithm is also presented to take care of the high PER in deep space links. The effect of the Retransmission Frequency has been critically analyzed considering both Lunar and Deep Space scenarios under different levels of PER. The results are very encouraging even in high error conditions. The protocol exhibits a RTT independent behavior in throughput, which is the most desirable quality of a protocol for deep space communication.

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State-of-the-Art of Transmission Protocols for Deep Space Communication Networks

Fang

Hou

et al. 2010

2010 First International Conference on Networking and Distributed Computing

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Experimental and Comparative Analysis of Channel Delay Impact on Rate-Based and Window-Based Transmission Mechanisms over Space-Internet Links

Cited by 3 publications

References 11 publications

Simulation based analysis of RTT with PER, Buffer Size and Congestion Levels for Satellite based Networks

Simulation based analysis of RTT with PER, Buffer Size and Congestion Levels for Satellite based Networks

Delay Resistant Transport Protocol for Deep Space Communication

State-of-the-Art of Transmission Protocols for Deep Space Communication Networks

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