Observations on the dynamics of a congestion control algorithm: the effects of two-way traffic
SIGCOMM '91 Proceedings of the conference on Communications architecture & protocols
TCP Vegas: new techniques for congestion detection and avoidance
SIGCOMM '94 Proceedings of the conference on Communications architectures, protocols and applications
The performance of TCP/IP for networks with high bandwidth-delay products and random loss
IEEE/ACM Transactions on Networking (TON)
The effects of asymmetry on TCP performance
MobiCom '97 Proceedings of the 3rd annual ACM/IEEE international conference on Mobile computing and networking
The macroscopic behavior of the TCP congestion avoidance algorithm
ACM SIGCOMM Computer Communication Review
Two-way TCP traffic over rate controlled channels: effects and analysis
IEEE/ACM Transactions on Networking (TON)
Computer networks: a systems approach
Computer networks: a systems approach
Modeling TCP Reno performance: a simple model and its empirical validation
IEEE/ACM Transactions on Networking (TON)
Some observations on the dynamics of a congestion control algorithm
ACM SIGCOMM Computer Communication Review
Improving TCP performance over asymmetric networks
ACM SIGCOMM Computer Communication Review
Effects of competing traffic on the performance of TCP/IP over asymmetric links
LCN '00 Proceedings of the 25th Annual IEEE Conference on Local Computer Networks
A duality model of TCP and queue management algorithms
IEEE/ACM Transactions on Networking (TON)
REFWA: an efficient and fair congestion control scheme for LEO satellite networks
IEEE/ACM Transactions on Networking (TON)
On TCP performance over asymmetric satellite links with real-time constraints
Computer Communications
Characterizing residential broadband networks
Proceedings of the 7th ACM SIGCOMM conference on Internet measurement
RTCSA '07 Proceedings of the 13th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications
Improving TCP performance in integrated wireless communications networks
Computer Networks: The International Journal of Computer and Telecommunications Networking - Wireless IP through integration of wireless LAN and cellular networks
TCP in wireless environments: problems and solutions
IEEE Communications Magazine
TCP-Jersey for wireless IP communications
IEEE Journal on Selected Areas in Communications
Improving TCP performance in residential broadband networks: a simple and deployable approach
ACM SIGCOMM Computer Communication Review
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In developing network-enabled embedded systems, developers are often forced to spend a great deal of time and effort analyzing and solving network performance problems. In this paper, we address one such problem: TCP performance interference on an asymmetric link. The upload or download throughput abruptly degrades if there is simultaneously upload and download TCP traffic on the link. While the problem has been addressed by many researchers, their solutions are incomplete as they only improve throughput in one direction, require TCP protocol modifications in end-user devices or are effective for a limited range of network configurations. In order to overcome such limitations, we propose ACKs-first variable-size queuing (AFVQ) for a gateway. In doing so, we have derived an analytic model of the steady-state TCP performance with bidirectional traffic to clearly identify the two sources of the problem: the excessive queuing delay of ACK packets and the excessive number of ACK packets in the queue. Our AFVQ mechanism is designed to directly eliminate the two causes. Specifically, we have based AFVQ on two policies. First, ACKs-first scheduling is used to shorten the queuing delay of ACK packets. Second, the queue size for ACK packets is dynamically adjusted depending on the number of data packets queued in the gateway so that the number of ACK packets is reduced when packets are congested in the gateway. By applying the two policies simultaneously at the uplink and downlink output queue in the gateway, AFVQ achieves balanced TCP throughput improvements in both directions. In this way, it breaks circular dependencies between upload and download traffic. We have implemented AFVQ in our ADSL-based residential gateway using the traffic control module of the Linux kernel. Our gateway yields 95.2% and 93.8% of the maximum download and upload bandwidth, respectively. We have also evaluated the proposed mechanism using the ns-2 simulator over a wide range of network configurations and have shown that AFVQ achieves better upload and download throughput than other representative gateway-based mechanisms such as ACQ, ACKs-first scheduling and ACK Filtering.