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We propose a transport protocol capable of dynamically adapting to network and receiver properties in multi-destination, multi-channel wireless networks. The key feature of our solution resides in its ability to convey common traffic to a group of users, while at the same time distributing information to each user as quickly as possible. This is achieved by clustering receivers in groups, each group...
There is the problem of absolute discrimination in current Active Queue Management (AQM) algorithms for Differentiated Services, the throughput and link utilization of network are decreased. In this paper we have presented an AQM algorithm, called Weighted-queue-length RIO-C (WRIO). WRIO realizes relative discrimination of different drop precedence, and improves link utilization, especially for the...
With the rapid development of network technology, computer network evolved to the mobile wireless Internet gradually, and showing a highly heterogeneous trend. The traditional TCP protocol is designed for wire circumstance and is obviously poor in such circumstance. This paper proposes a new TCP scheme, called TCP-C, which is based on Explicit Congestion Notification algorithm ( ECN), referencing...
Based on the analysis of TCP performance of over the two ways of IEEE 802.11 DCF (RTS/CTS and CSMA/CA), TCP flows becomes unstable when WLAN is in high load. In this paper, we propose a novel backoff algorithm for IEEE 802.11 DCF named as ACWB (adaptive contention window backoff) with cross-layer optimization. Its basic idea is to dynamically adjust the size of the contention window by the estimation...
Congestion control is the key techniques of Next-Generation-Networks. The classical TCP congestion control such as RED is difficult to configure parameters and the average queue length is related to the load level. A network-measurement based on congestion control algorithm is proposed, the essential idea is introduce macroscopic guidance according to network measurement, the measurement facilities...
New rate control schemes are necessary for Internet streaming flows to smoothly use the available bandwidth. To equally share the Internet bandwidth with existing TCP flows, these schemes should meet the TCP-equivalent criterion, i.e. the same rate as TCP under the same network conditions. This work proposes a window-averaging rate control (WARC) scheme to sends packets at the average rate that a...
In this paper, we introduced an adaptive cumulative layered multicast scheme, ACLM, to address multicast receivers' heterogeneity in available bandwidth. ACLM uses an optimal layer rate allocation algorithm which can maximally satisfy each receiver's available bandwidth. Through a novel feedback aggregate algorithm, ACLM dynamically determines the number of layers and the rate of each layer. Simulation...
This paper studies the problem of the real-time communication in the on-line monitoring system, which achieves the on-line monitoring of B / S mode through the ActiveX controls and network programming technology based on the TCP / IP protocol. This paper proposes an improved congestion control algorithm grounded on the one-way delay (CCAOD), using the value and the change trendency of the one-way...
In the standard TCP congestion control mechanism such as TCP Reno, it may cause the issue that packet sending rate increase exponentially in the slow start phase so significantly that it leads to the decline of TCP performance due to the overflow of bottleneck link buffer. One of the ways of TCP modification is based on estimation of the fair share of the available bandwidth for each flow and adjustment...
The number of multi-homed hosts with multiple network interfaces has been increasing due to cheaper network interface devices and network diversification. Concurrent Multipath Transfer (CMT) using SCTP multihoming is a mechanism that simultaneously transmits data via multiple end-to-end paths compatible with today's network environment. Present studies on CMT have assumed that each path uses a homogeneous...
The paper studies the intelligent detection system based on TCP/IP protocol and realizes real-time detection based on B/S mode. This article focuses on the real-time problem of the communication system, an also propose an improved algorithm of congestion avoidance based on receiver-driven(CARD). Being different from the RTT algorithm and some traditional algorith, CARD uses one-way delay detecting...
Recently, wireless LANs have been used widely because they are flexible and easy to install. However, there are unfairness problems in wireless LANs, in that a small number of stations (STAs) may obtain a large throughput while other STAs hardly get any bandwidth. One of the unfairness problems occurs between upstream and downstream flows because the access point (AP) and each STA have the same transmission...
With the emergence of high bandwidth-delay product and heterogeneous wired / wireless networks, the standard TCP appears to be too conservative to offer reasonable performance. The use of parallel TCP connections has been suggested in such environments. We have demonstrated that, with the same level of aggressiveness, this approach can outperform the single-connection based approach. However, this...
This paper presents a file transfer global dynamic scheduling algorithm that incorporates the two optimizations of multi-hop path splitting and multi-pathing in conjunction with the use of available file replicas, This algorithm makes use of information from past GridFTP transfers to estimate network bandwidths and resource availability. The experimental results show that this algorithm achieve significant...
Layered multicast has been proposed as a solution to video multicast over Internet. Existing multicast protocols usually perform layer adaptation at the receiver's side, using static layer rate allocation techniques at the sender's side. In this paper, the basic theory of layered multicast was introduced firstly. The technology of dynamic sender-driven rate allocation was discussed. Especially, a...
Mesh networks are characterized by the use of multiple channels and multiple interfaces to improve the system throughput. A multi-interface multi-channel wireless mesh network consists of a number of stationary or minimally mobile wireless routers, forming a multi-hop Internet backbone. Previous research has revealed that single channel IEEE 802.11 MAC protocols are not suitable for multihop network...
We propose and investigate dynamic bandwidth allocation algorithm with an adaptive polling cycle (DBA-APC) to maximize the TCP throughput in an Ether passive optical network. DBA-APC is designed to overcome the limiting factors of current DBA algorithms, such as inefficient TCP throughput in the downstream and upstream directions. The algorithm is based on a polling cycle adjustment that considers...
Data-intensive applications frequently transfer large amounts of data over wide-area networks. The performance achieved in such settings can often be improved by routing data via intermediate nodes chosen to increase aggregate bandwidth. We explore the benefits of overlay network approaches by designing and implementing a service-oriented architecture that incorporates two key optimizations - multi-hop...
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