Random early detection gateways for congestion avoidance
IEEE/ACM Transactions on Networking (TON)
TCP Vegas: new techniques for congestion detection and avoidance
SIGCOMM '94 Proceedings of the conference on Communications architectures, protocols and applications
Analysis of TCP performance over mobile ad hoc networks
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
Capacity of Ad Hoc wireless networks
Proceedings of the 7th annual international conference on Mobile computing and networking
A comparison of TCP performance over three routing protocols for mobile ad hoc networks
MobiHoc '01 Proceedings of the 2nd ACM international symposium on Mobile ad hoc networking & computing
Improving TCP performance over mobile ad-hoc networks with out-of-order detection and response
Proceedings of the 3rd ACM international symposium on Mobile ad hoc networking & computing
How Bad TCP Can Perform In Mobile Ad Hoc Networks
ISCC '02 Proceedings of the Seventh International Symposium on Computers and Communications (ISCC'02)
Enhancing TCP fairness in ad hoc wireless networks using neighborhood RED
Proceedings of the 9th annual international conference on Mobile computing and networking
TCP over multihop 802.11 networks: issues and performance enhancement
Proceedings of the 6th ACM international symposium on Mobile ad hoc networking and computing
A Performance Comparison of TCP Protocols over Mobile Ad Hoc Wireless Networks
CERMA '06 Proceedings of the Electronics, Robotics and Automotive Mechanics Conference - Volume 02
Distributed Flow Control and Medium Access in Multihop Ad Hoc Networks
IEEE Transactions on Mobile Computing
CODE TCP: A competitive delay-based TCP
Computer Communications
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Performance of TCP-Vegas is not satisfactory in multihop ad hoc networks over IEEE 802.11 MAC protocol. We analyze the problem with a unified network model and a TCP source window model. We observe that Vegas cannot maintain the optimal window with maximum average throughput when the network capacity is smaller than the reset slow start threshold of Vegas. The aggregate throughput of all traffics decreases as the load of network increases. The main reasons lie in Vegas's large minimum congestion window, large reset slow start threshold and aggressive window increase policy. All of them induce overload of the network, which cause packet losses at MAC layer and over-reaction at routing layer. These in return result in the breakup of end-to-end connections and reduce the throughput. To fix these problems, we propose a modified TCP protocol based on TCP-Vegas for multihop ad hoc networks, called Vegas-W. We extend congestion window to fraction with a rate control timer under the TCP sending process. Probing mechanisms of legacy TCP-Vegas in both slow start and congestion avoidance phases are changed to increase congestion window after receiving more than one ACK. Furthermore, we update slow start threshold by tracking stable window. We evaluate the performance of Vegas-W through ns-2. Extensive simulation results show that Vegas-W can improve the throughput up to 87% over legacy TCP-Vegas over a variety of topologies including chain, grid, star, dumbbell and hammer, etc.