In this paper, we propose a simply TCP-friendly source adaptation framework to provide a proportional bandwidth sharing service. Our scheme is based on the framework of Monotonic Response Function (MRF), can be used t...In this paper, we propose a simply TCP-friendly source adaptation framework to provide a proportional bandwidth sharing service. Our scheme is based on the framework of Monotonic Response Function (MRF), can be used to bound the sending rate of a source within a predefined interval and provide very smooth traffic, and is suitable for multimedia applications over the Internet. As our scheme is also very simple and TCP-friendly, it is easy to be deployed over the current Internet. We verify our scheme with experimental studies.展开更多
In a hybrid wired-cum-wireless network environment, packet loss may happen because of congestion or wireless link errors. Therefore, differentiating the cause is important for helping transport protocols take actions ...In a hybrid wired-cum-wireless network environment, packet loss may happen because of congestion or wireless link errors. Therefore, differentiating the cause is important for helping transport protocols take actions to control congestion only when the loss is caused by congestion. In this article, an end-to-end loss differentiation mechanism is proposed to improve the transmission performance of transmission control protocol （TCP）-friendly rate control （TFRC） protocol. Its key design is the introduction of the outstanding machine learning algorithm - the support vector machine （SVM） into the network domain to perform multi-metric joint loss differentiation. The SVM is characterized by using end-to-end indicators for input, such as the relative one-way trip time and the inter-arrival time of packets fore-and-aft the loss, while requiring no support from intermediate network apparatus. Simulations are carried out to evaluate the loss differentiation algorithm with various network configurations, such as with different competing flows, wireless loss rate and queue size. The results show that the proposed classifier is effective under most scenarios, and that its performance is superior to the ZigZag, mBiaz and spike （ZBS） scheme.展开更多
In this paper, a TCP-friendly rate control algorithm is proposed for storedMPEG2 layered video. In this algorithm, RTT is observed at the receiver through the use of probe APPpackets, and the control interval is chose...In this paper, a TCP-friendly rate control algorithm is proposed for storedMPEG2 layered video. In this algorithm, RTT is observed at the receiver through the use of probe APPpackets, and the control interval is chosen based on the self-similar nature of MPEG2 traffic . Inaddition, the estimated receiving rate is used as an indication to the network status when nopacket loss is detected . In our simulations, a friendliness of 0.94 is obtained, and the videoquality fluctuations are acceptable with this control algorithm.展开更多
Real-time streaming media over the Internet is an important component of multimedia applications. For the sake of quality of service (QoS), they make rigid demands on bandwidth, delay and packet loss. However, the cur...Real-time streaming media over the Internet is an important component of multimedia applications. For the sake of quality of service (QoS), they make rigid demands on bandwidth, delay and packet loss. However, the current Internet does not offer any QoS guarantees to real-time streaming media over it. How to maximize the transmission quality of real-time streaming applications in a best-effort network while friendly sharing bandwidth with non-real time applications like TCP has become an important issue. But now, many real-time streaming applications based on UDP rarely perform congestion control in a TCP-friendly manner, and they do not share the available bandwidth fairly with applications built on TCP. The Internet communication strongly fears that the current evolution could lead to congestion collapse and starvation of TCP traffic. For this reason, TCP-friendly protocols are being developed to behave fairly with respect to coexistent TCP flows. In this paper we present a new window-based congestion control method—fast fair binomial congestion control (FFBCC) for real-time applications. It provides a good performance of bandwidth distribution and TCP-friendliness for real-time streaming transmission while competing bandwidth with TCP flows.展开更多
In order to solve the problems of link layer retransmission and packet fragment strategies for IEEE 802.11,this paper proposes a variable packet TCPfriendly rate control(VPTFRC)scheme for streaming media transmission ...In order to solve the problems of link layer retransmission and packet fragment strategies for IEEE 802.11,this paper proposes a variable packet TCPfriendly rate control(VPTFRC)scheme for streaming media transmission over wireless local area network(WLAN)by researching on the policy of packet size adjustment in transport layer based on the minimum retransmit-delay constraint.Unlike other proposals,this process considers the impact of wireless packet error ratio(PER)on the packet size adjustment and the performance of rate control.Simulation results demonstrate that our proposed process can simultaneously achieve higher throughput,better fairness,shorter transmission delay and less jitter than TFRC.Among them,the ratio of delay,jitter and packet loss rate can reach a maximum improvement ratio of 58%,42% and 85% respectively.展开更多
文摘In this paper, we propose a simply TCP-friendly source adaptation framework to provide a proportional bandwidth sharing service. Our scheme is based on the framework of Monotonic Response Function (MRF), can be used to bound the sending rate of a source within a predefined interval and provide very smooth traffic, and is suitable for multimedia applications over the Internet. As our scheme is also very simple and TCP-friendly, it is easy to be deployed over the current Internet. We verify our scheme with experimental studies.
基金supported by the National Natural Science Foundation of China (60772114)
文摘In a hybrid wired-cum-wireless network environment, packet loss may happen because of congestion or wireless link errors. Therefore, differentiating the cause is important for helping transport protocols take actions to control congestion only when the loss is caused by congestion. In this article, an end-to-end loss differentiation mechanism is proposed to improve the transmission performance of transmission control protocol （TCP）-friendly rate control （TFRC） protocol. Its key design is the introduction of the outstanding machine learning algorithm - the support vector machine （SVM） into the network domain to perform multi-metric joint loss differentiation. The SVM is characterized by using end-to-end indicators for input, such as the relative one-way trip time and the inter-arrival time of packets fore-and-aft the loss, while requiring no support from intermediate network apparatus. Simulations are carried out to evaluate the loss differentiation algorithm with various network configurations, such as with different competing flows, wireless loss rate and queue size. The results show that the proposed classifier is effective under most scenarios, and that its performance is superior to the ZigZag, mBiaz and spike （ZBS） scheme.
文摘In this paper, a TCP-friendly rate control algorithm is proposed for storedMPEG2 layered video. In this algorithm, RTT is observed at the receiver through the use of probe APPpackets, and the control interval is chosen based on the self-similar nature of MPEG2 traffic . Inaddition, the estimated receiving rate is used as an indication to the network status when nopacket loss is detected . In our simulations, a friendliness of 0.94 is obtained, and the videoquality fluctuations are acceptable with this control algorithm.
文摘Real-time streaming media over the Internet is an important component of multimedia applications. For the sake of quality of service (QoS), they make rigid demands on bandwidth, delay and packet loss. However, the current Internet does not offer any QoS guarantees to real-time streaming media over it. How to maximize the transmission quality of real-time streaming applications in a best-effort network while friendly sharing bandwidth with non-real time applications like TCP has become an important issue. But now, many real-time streaming applications based on UDP rarely perform congestion control in a TCP-friendly manner, and they do not share the available bandwidth fairly with applications built on TCP. The Internet communication strongly fears that the current evolution could lead to congestion collapse and starvation of TCP traffic. For this reason, TCP-friendly protocols are being developed to behave fairly with respect to coexistent TCP flows. In this paper we present a new window-based congestion control method—fast fair binomial congestion control (FFBCC) for real-time applications. It provides a good performance of bandwidth distribution and TCP-friendliness for real-time streaming transmission while competing bandwidth with TCP flows.
文摘In order to solve the problems of link layer retransmission and packet fragment strategies for IEEE 802.11,this paper proposes a variable packet TCPfriendly rate control(VPTFRC)scheme for streaming media transmission over wireless local area network(WLAN)by researching on the policy of packet size adjustment in transport layer based on the minimum retransmit-delay constraint.Unlike other proposals,this process considers the impact of wireless packet error ratio(PER)on the packet size adjustment and the performance of rate control.Simulation results demonstrate that our proposed process can simultaneously achieve higher throughput,better fairness,shorter transmission delay and less jitter than TFRC.Among them,the ratio of delay,jitter and packet loss rate can reach a maximum improvement ratio of 58%,42% and 85% respectively.
