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Network virtualization, through building multiple virtual networks on top of a shared substrate, provides a potential strategy for addressing the ossification of the Internet and encourages network innovation. Traffic clustering is the base and key technology in network virtu-alization. This paper presents a two-layer traffic clustering algorithm. In the first layer, different types of user traffic...
Streaming service is becoming more popular for many users to access multimedia content. With different demand of clients and different service charge given, streaming servers must provide different levels of quality of service (QoS) and apply more effective resource management scheme. This paper proposes an enhanced model of harmonic proportional bandwidth allocation scheme to re-utilize the released...
During video streaming over packet-erasure network, packets may lose due to network congestion. Since video packets have different significance and validity for decoding, the streaming system is expected to transmit the most critical packets when congestion occurs. In this paper, a packet criticality model is proposed and then a video transmission framework based on this model is presented. The criticality...
There are many challenges in the QoS controls and traffic handling mechanisms in the deployment of Long Term Evolution (LTE). Simulations are crucial for performance evaluation of end-to-end QoS (Quality of Service) management across LTE network elements over heterogeneous networks. The LTE CoS/QoS Harmonization Emulator presented in this paper will allow the user to determine whether the QoS design...
Supporting real-world activities online has been one of the main goals in applied computer science. However, the gathering of a large crowd for a specific purpose (e.g., lecture, concert, rally), has not yet moved online. The recent concept of crowdcasting (i.e., broadcasting to an audience while engaging them with real-time feedback) may pave the way towards it, but the audience scale and feedback...
Bee zone is a large-scale live video streaming system, which adopts dual-protocol-stack technology and gossip-like protocol to build an unstructured P2P application layer overlay, which can be used in IPv4/v6 hybrid network environment. We run the system during the 2010 FIFA World Cup South Africa. By collecting the logs from the system when it works, we study the workload, performance, and dynamics...
Nowadays, several live and on-demand streaming solutions use HTTP for signaling and data delivery. A frequently used technique is to chop a continuous stream into segments, encode these in multiple qualities and make these available for download using plain HTTP methods. This approach has become known as dynamic adaptive segment streaming over HTTP. Its advantage is that the deployed web infrastructure...
Many emerging multimedia applications enable independent groups (or clusters) of consumers to interact between them and share services within the context of simultaneous media content consumption. Owing to the semantic, spatial or temporal dependency among the involved media streams, concurrently synchronized playout points must be ensured so as not to spoil the user experience on such interaction...
This paper aims to reduce the amount of prebuffering required to ensure a maximum video continuity in streaming. Current approaches do this by slowing the playout frame rate of the decoder, this is known as adaptive media playout (AMP). However, doing this introduces playout distortion to the viewers as the video is played slower than its natural playout rate. We approach this by proposing a frame...
The paper describes a video streaming application build to evaluate session continuity over wireless hybrid access networks in vertical handover (VHO) conditions. The results showed us which components have to be improved. Further developments will address these improvements.
Using multipath routing protocols results in more efficient data transmission than single path routing protocols in Wireless Multimedia Sensor Networks (WMSNs). In this paper, we propose a new mechanism for improving video transmission over WMSN based on queue priority scheduling. We assume that network has high CBR traffic with no video data in addition to video packets. In our mechanism, intermediate...
An accurate model of IEEE 802.11e EDCA for video quality analysis is introduced in this paper. The analysis of the model considers not only the effects of collision loss from channel access competition but also wireless loss caused by interferences and fading. Using the model, we derive the video frame loss probability and distribution of access delay, and validate the accuracy of the proposed model...
In the context of forest fire management, wireless communication is an indispensable tool. It insures events information transmission and communication between fire defenders. Traditionally, cellular networks (CNs) are used during crisis. However due to the lack of population in far forests, CNs suffer from coverage problems. In addition, the experience has proved some reachability and capacity problems...
Real-time Internet services such as video transmission and online gaming often require privileged treatment in the Internet routers and wireless links in order to meet their real-time QoS requirements. The challenge is to know which are the services requiring higher priority and when this special treatment is needed. In this study, we introduce mechanisms to intelligently classify different traffic...
The LTE specification provides QoS of multimedia services with fast connectivity, high mobility and security. However, 3GPP specifications have not defined scheduling algorithms to support real time and non-real time application services. In this paper we propose a modified version of M-LWDF and EXP/PF scheduling algorithms based on token mechanism, which provide better performance to real time flows...
Given that statistical multiplexing of video streams is employed in enhanced Multimedia Broadcast/Multicast Service (e-MBMS), we address the issue of scheduling across the streams towards Advanced-Long Term Evolution (LTE-A) system, in order to improve the quality of service (QoS) performances. In this paper, the optimization problem of scheduling and resource allocation for separate streams is first...
In the past, network operators were content with offering simple services such as voice and text messaging. However, they began to notice that these services were generating lower revenues even while the number of subscribers increased. Network operators are now forced to rapidly deploy value added services with minimum capital investment while maximising revenue from service usage by end users. Network...
In the radio channel, compression is used for transmission of real-time analog video signal and compressed bits can usually be transmitted at a non-constant rate. But standard video can be displayed on TV at a constant rate. It is difficult to decode the intermittent compressed data for real-time video display. In order to solve the problem which rate of video decoding and compressed bits in the radio...
Using multipath routing protocols results in more efficient data transmission than single path routing protocols in Wireless Multimedia Sensor Networks (WMSNs). In this paper, we propose a new mechanism for improving video transmission over WMSN based on packet, path and queue priority scheduling over multipath routing protocol. We assume that network has high CBR (Constant Bit Rate) traffic with...
Television is now changing its traditional distribution forms to being distributed digitally over broadband networks. The recent development of broadband Internet connectivity has made the transition to Internet Protocol Television (IPTV) possible. When changing distribution technique of an existing service, it is important that the new technique does not make the service worse from the user's point...
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