Abstract
Nowadays, quality of service (QoS) is very popular in various research areas like distributed systems, multimedia real-time applications and networking. The requirements of these systems are to satisfy reliability, uptime, security constraints and throughput as well as application specific requirements. The real-time multimedia applications are commonly distributed over the network and meet various time constraints across networks without creating any intervention over control flows. In particular, video compressors make variable bit-rate streams that mismatch the constant-bit-rate channels typically provided by classical real-time protocols, severely reducing the efficiency of network utilization. Thus, it is necessary to enlarge the communication bandwidth to transfer the compressed multimedia streams using Flexible Time Triggered- Enhanced Switched Ethernet (FTT-ESE) protocol. FTT-ESE provides automation to calculate the compression level and change the bandwidth of the stream. This paper focuses on low-latency multimedia transmission over Ethernet with dynamic quality-of-service (QoS) management. This proposed framework deals with a dynamic QoS for multimedia transmission over Ethernet with FTT-ESE protocol. This paper also presents distinct QoS metrics based both on the image quality and network features. Some experiments with recorded and live video streams show the advantages of the proposed framework. To validate the solution we have designed and implemented a simulator based on the Matlab/Simulink, which is a tool to evaluate different network architecture using Simulink blocks.
Highlights
Distributed enterprise networks have the capacity to transmit any number of multimedia files to any number of channel servers without any special setup
We proposed dynamic quality of service (QoS) management features of the FTT over Switched Ethernet protocol (FTT-SE) to carry out the referred adaptation with MJPEG video streams
We present four major methodologies in this paper for improving the average performance of real time communication over switched ethernet supporting QoS management by using Flexible Time TriggeredEnhanced Switched Ethernet (FTT-ESE)
Summary
Distributed enterprise networks have the capacity to transmit any number of multimedia files to any number of channel servers without any special setup. Matching a VBR source to a CBR channel is non-trivial and can lead to waste of bandwidth or rejection of frames This difficulty became challenging with the emergence of MES applications that impose reliability and timeliness requirements that cannot be fulfilled by standard network protocols [13], usually due to a lack of temporal isolation and consequent unbounded mutual interference between streams. In addition to the channel period, the QoS layer can adapt the channel width (C), enlarging the configuration space This approach brings higher flexibility and increased granularity to the channel bandwidth allocation mechanism. For some systems, changing the channel period is undesirable due to rate, coupling among different channels or to constraints imposed by application-level controllers (e.g., sample period) In this case, the only possibility is to adapt the channel width while keeping the respective period constant.
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