Impact of Frame Duration and Modulation Coding Schemes With WiMAX Bandwidth Asymmetry in Transmission Control Protocol Variants

Impact of Frame Duration and Modulation Coding Schemes With WiMAX Bandwidth Asymmetry in Transmission Control Protocol Variants

Kailash Chandra Bandhu (Acropolis Technical Campus, Indore, India) and Ashok Bhansali (OP Jindal University, Raigarh, India)
DOI: 10.4018/IJWNBT.2019010103
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WiMAX stands for Worldwide Interoperability for Microwave Access which is based on IEEE 802.16 specification and is considered as de facto standard for the broadband wireless data transfer over the internet. The different values of various WiMAX parameters for different TCP variants may affect the performance of the network. This article compares the performance of different TCP variants with bandwidth asymmetry, frame duration, and modulation coding schemes, along with the operating parameter namely number of wireless nodes. During the simulation study the performance was evaluated only for one-way data transfer. The finding suggests that the TCP New Reno performed better than other variants included in the simulation study for the comparison. The performance was measured on the basis of throughput, goodput and packets dropped.
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The Three Major Changes Induced By Vegas (Bandhu, & Vishwakarma, 2016)

New Retransmission Mechanism

Vegas extended the retransmission mechanism proposed by Reno. Vegas model keeps a track of all the segments sent. At the same time, it also keeps a record of time taken for the acknowledgement to receive and this is used in calculating an estimate of the RTT. Whenever a duplicate acknowledgement is received it is checked for retransmission. If the current segment transmission time is greater than estimated RTT then the segment is immediately retransmitting without waiting for three duplicate acknowledgements or coarse timeout. Thus, Vegas model gives the solution of the problem faced by Reno of not being able to detect lost packets when it had a small window and it didn’t receive enough duplicate ACKs. Vegas model also detects multiple packet losses and overcomes Reno’s shortcoming by reducing the congestion window multiple times.

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