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This paper introduces a novel QoS architecture for process automation. The proposed architecture leverages the concept of Software Defined Network. The architecture maintains the real-time communications based on the measured propagation time. It maintains the configurations by detecting and predicting the change of propagation time in addition to queue usage. The authors utilize the OpenFlow with...
The data transmission is not controllable within the networked test system, which would result in poor real-time performance and low data transmission reliability. Those problems would lead to the poor test efficiency and even chaos states in the test procedure because of the loss of critical data. This paper proposed a congestion management method named "PQ+WRR", which can effectively alleviate...
Voice communication requires stricter QoS than other types of data communication. Thus, network operations, including the MAC layer protocol, should provide specific voice communication handling to meet voice application requirements. The current MIL-STD-188-220 does not guarantee the QoS of voice communication because of the round robin scheduling mechanism in network access control. Thus, we propose...
For seamless mobility in networks that use Proxy Mobile IPv6, Proxy Fast Mobile IPv6 (PFMIPv6) is being standardized. The predictive handover mode of PFMIPv6 can minimize packet loss by forwarding user data from the old mobile access gateway (MAG) to the new MAG to which the mobile terminal (MT) makes a handover and by buffering the forwarded data at the new MAG until the MT is attached to the new...
Recent large deployment of high-speed metro Ethernet networks creates opportunity to connect legacy telephone exchange centers and cellular telephone base stations to the core telephony network. The success of data and legacy voice services convergence shall depend on whether it can provide the customer with the required QoS or not. Packet-base telephony service requires stringent bounds on end-to-end...
A method is introduced in this paper for monitoring the transmission quality of streaming media. The transmission quality of streaming media is characterized by some parameters, such as transmission bandwidth, jitter and packet loss rate, etc. A model is given to illustrate how to obtain these parameters. Then, a monitoring system based on this model is implemented on the Windows XP SP2 platform....
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
Considering the high packet losses and low, varying bandwidth of GPRS/EDGE network and limited computation power of handheld devices, we present and implement a novel SVC video-on-demand system for hand-held devices over GPRS/EDGE network. For the purpose of handling varying bitrate, we propose a priority based layer switching (PLS) adaptation scheme for SVC stream, which not only performs online...
The upcoming high-speed networks are expected to support a wide variety of real-time multimedia applications. However, the current Internet architecture offers mainly best-effort service and does not meet the requirements of future integrated services networks that will require guarantee for transferring heterogeneous data. There are many parameters involve in improving the performance of a computer...
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