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In RFID systems, the reader is unable to discriminate concurrently reported IDs of tags from the overlapped signals, and a collision happens. Many algorithms for anticollision are proposed to improve the throughput and reduce the latency for tag identification. Existing anti-collision algorithms mainly employ CRC based collision detection functions for determining whether the collision happens. Generating...
This paper presents a Model of Quality of Service (QoS) for Next Generation Networks (NGN), that consist of a tower of five defined layers such as the Model Layer of QoS, Control of Admission, QoS in the Routing, QoS in the Signaling, and MAC QoS. In addition, the model raises a method based on the concept of segregation of functions defining two functional networks along with the tasks of QoS. Then,...
In this paper the Policing Traffic Management (PTM) is applied to improve the Quality of Service (QoS) over Inter-Vehicular Communications (IVCS). Bangkok is the capital city, and it is crowned of Ad Hoc nodes such as Mobile Ad Hoc Networks (MANET), FleetNET, CARNET, BTSNET and electronic devices. Each network has unique data traffic characteristics. For MANNET, most traffic is video and voice traffic;...
Data center networks (DCNs) usually have a regular topology providing high bandwidth and low latency with multi-paths. In a data-intensive application on DCNs, it is important to be able to use all the available bandwidth. However, this is not easy to achieve because of the locality of congestion information. In this paper, we propose a reactive reroute strategy to incorporate with IEEE 802.1Qau standards...
Active queue management (AQM) is an effective method acting on routers to improve the performance of end-to-end congestion control. However, most of the current AQM schemes are sensitive to network configurations as well as parameterization problems. In this paper, we propose a self-tuning congestion control scheme, named SPC. An enhanced price with proportional-integral-derivative control property...
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...
Next-generation wireless networks such as LTE and WiMax can achieve throughputs of several Mbps with TCP. These higher throughputs, however, can easily be destroyed by frequent handoffs, which occur in urban environments due to shadowing. A primary reason for the throughput drop during handoffs is the out of order arrival of packets at the receiver. As a result, in this paper, we model the precise...
Recently, both research-and-education networks (RENs) and commercial networks have added a dynamic circuit service. With this service, users can request and obtain dedicated bandwidth for short durations (on the order of minutes to hours). Host-to-host (cluster-to-cluster) circuits are used for large file transfers. The network nodes used for this circuit service are not pure TDM or WDM circuit switches;...
We propose an algorithm to choose a reasonable backoff window based on prediction of the congestion of downstream and upstream nodes. The algorithm listens to the number of consecutive idle slots of the wireless network, then calculates the congestion and feeds it back to the downstream node and upstream node. When sending packets, a reasonable backoff window is chosen, depending on downstream and...
In order to fully realize the potential of Cloud and High Performance Computing (HPC) applications, significant improvement is required in the cost/performance of data center networks. While recent industry standards such as Quantized Congestion Notification (QCN) for Converged Enhanced Ethernet (CEE) have begun to address this issue, there are still significant problems left open. Therefore we propose...
This paper deals with the model of Adaptive multi-hop routing algorithm for Wireless Sensor Network (WSN) and its results are presented. Certain parameters like energy level, delay and velocity are considered. These decisions will come up with the optimal and organized route for WSN. In addition, the stated algorithm is enhanced with the multipath capability to avoid congestion state in WSN. Eventually,...
This paper presents a protocol designed as an alternative to classical TCP for channels which experience high loss-rates. The protocol is simplified with respect to TCP by eliminating the need of retransmissions and the associated buffers. This is achieved by applying a rateless erasure correcting code to the data that is going to be transferred. A modified version of the TCP congestion control algorithms...
Ad hoc networks, which are multi-hop and autonomous decentralized networks, have broad perspective in military communication, emergency communication, sensor networks and so on. Enhancing the performance of Ad hoc networks is one of the important objectives in the design of networks while congestion is a significant contributor that leads to network performance degradation. Many different congestion...
In this paper, we first investigate the relationship between packet length and packet loss rate in the Gilbert wireless error model. Then we propose a congestion control scheme which can detect the nature of packet losses by sending large and small packets alternately. By means of updating factor and loss queue, this proposed scheme can adapt to the changes of network states quickly and improve delivery...
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...
According to different priority based services, IEEE 802.16e WiMAX standard classifies packets as UGS, RTPS, eRTPS, nRTPS, BE. The standard treats all packets generated while browsing the internet as delay tolerant packets and classifies them as Best Effort (BE) packets. This includes BE packets generated while browsing secure websites. However, secure transactions are governed by time constraints...
TCP has been a congestion control method in the Internet. However, since TCP is not able to directly measure the network status from the end nodes, the TCP window control gradually increases the congestion window size until congestion occurs. This control gets network bandwidth aggressively and affects communication of all stations (STAs) which belong to the same access point of IEEE 802.11 standards...
In this paper, we study the performance of active queue management algorithms for packet queueing in Internet routers in the presence of new versions of the TCP congestion control mechanism. In particular, we compare the performance of tail drop, adaptive RED, AVQ, PI, REM and AN-AQM queueing in four TCP cases: (i) the classic New Reno protocol, (ii) the Sack protocol, (iii) the Fack protocol, (iv)...
The technologies of Wireless local networks and cellular network are very popular and more and more service under the integrated heterogeneous environment. Stream Control Transmission Protocol (SCTP) is considered as an ideal to support the communication between them by enabling a mobile client to freely switch the IP address in different networks. In this paper, we propose an extended analytical...
Heterogeneous Wireless Networks are considered nowadays as one of the potential areas in research and development. The traffic management schemes that have been used at the fusion points between the different wireless networks are classical and conventional. This paper is focused on developing a novel scheme to overcome the problem of traffic congestion in the fusion point router interconnected the...
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