Abstract
Transmission Control Protocol (TCP) was designed to provide reliable end-to-end delivery of data over unreliable networks. In practice, most TCP deployments have been carefully designed in the context of wired networks. Ignoring the properties of wireless and Ad-hoc Networks can lead to TCP implementations with poor performance. In a wireless network, however packet losses occur more often due to unreliable wireless links than due to congestion. When using TCP over wireless links, each packet loss on the wireless link results in congestion control measures being invoked at the source. This causes severe performance degradation. If there is any packet loss in wireless networks, then the reason for that has to be found out. If there is congestion, then only congestion control mechanism has to be applied. This work shows the performance of TCP with Adaptive Pacing (TCP-AP) and Link Random Early Discard (LRED) as queuing model in multihop transmission when the source and destination nodes are in mobile nature. The adaptive pacing technique seeks to improve spatial reuse. The LRED technique seeks to react earlier to link overload. This paper consists of simulated environment results under different network scenarios. This work proves that the combination of TCP-AP and LRED give much better result than as the individual technique. Simulations are done with the use of NS-2.
Highlights
Wireless Networking has emerged as a promising technology to meet the challenges in generation networks
This work shows the performance of Transmission Control Protocol (TCP) with Adaptive Pacing (TCP-AP) and Link Random Early Discard (LRED) as queuing model in multihop transmission when the source and destination nodes are in mobile nature
Analysis had been done in four cases as: (i) Simple TCP NewReno with queuing DropTail (ii) TCP-AP with queuing DropTail (iii) TCP NewReno with queuing Link Randomly Early Detection (RED) (LRED) (iv) TCP-AP and queuing LRED
Summary
Wireless Networking has emerged as a promising technology to meet the challenges in generation networks. In a typical wireless network that uses IEEE 802.11 MAC packets may be dropped due to either buffer overflow or link-layer contention caused by hidden terminals Such losses directly affect TCP window adaptation. Fu et al [1] pointed out the hidden terminal problem in wireless multihop networks and experimentally showed that for a chain topology the optimal windows size for which TCP achieves best throughput, is roughly given by 1/4 of the hop count of the path They proposed two enhancements on the link layer: adaptive pacing to distribute traffic on the link layer among intermediate nodes in a more balanced way and link layer RED to throttle TCP senders when incipient congestion is detected. LRED is a simple mechanism that, by monitoring a single parameter – the average number of retries in the packet transmissions at the link-layer, accomplishes three goals: a) It helps to improve TCP throughput, b) It provides TCP an early sign of network overload, and c) It helps to improve interflow fairness
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Wireless & Mobile Networks
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
