Priority-Aware Packet Pre-marking for DiffServ Architecture Based on H.264/SVC Video Stream Structure

Abstract

The H264/SVC codec allows for generation of hierarchical video streams. In the stream of this type video data belonging to different layers have different priority depending on their importance to the quality of the video and the decoding process. This creates new demands on the mechanisms of packet marking, and thus new challenges for the policy guaranteeing QoS parameters, such as those defined in the DiffServ architecture. Therefore, mechanisms of the traffic engineering used in the DiffServ network should, as far as possible, take into account internal distribution of priorities inside video streams. This may be achieved by implementing an appropriate method for packet pre-marking. The paper describes the Weighted Priority Pre-marking (WPP) algorithm for priority-aware SVC video streaming over a DiffServ network. Our solution takes into account the relative importance of the Network Abstraction Layer Units. It also does not require any changes in the implementation of the DiffServ marker algorithm. The results presented confirm that video transmission in the DiffServ domain, based on the WPP packet pre-marking, can provide better perceived video quality than the standard (best effort) streaming of multilayered SVC video. In addition, a comparison with the transmission of the same video content encoded with the H264/AVC codec also points to the superiority of our proposed method.

Tuning parameters of the isochronous endpoint of a USB peripheral device in a multimedia system

“…125 µs), therefore, in order to show more packages on Gantt charts, the warping time method [13] was used. The time warping function (using symbols described in [6] is as follows:…”

“…The architecture of the latest version of this port, 3.1, has been completely revised, and the solutions proposed in the quoted publications cannot be applied to the latest version of the USB port (USB 3.1 Gen 1). Some attempts to define the process model data in a USB 3.1 port has been made in the work [5]- [6]. The similar problem of applying QoS, defined in this case as ensuring the synchronization of peripheral devices using the broadcast mechanism of isochronous time stamps, was also considered in paper [4].…”

A Design of Packet Scheduling Algorithm to Enhance QoS in High-Speed Downlink Packet Access (HSDPA) Core Network

“…These assigning of colors depends on packet arrival rate. There are two types of rates that are Peak Target Rate (PTR) and Committed Target Rate (CTR) [7]. If the packet's throughput meets the PTR then ItswTCM will assign red color to that packet with high priority.…”

Implementation of Class-Based Low Latency Fair Queueing (CBLLFQ) Packet Scheduling Algorithm for HSDPA Core Network

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“…To achieve customized services, we should assign some priority to the desired traffic [7]. The tswTCM algorithm suffers from traffic fairness issue [11,2].…”