MMSys'21 DS- RezaFarahani.pdf
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1) The document discusses research into improving HTTP adaptive video streaming through network assistance from CDNs and SDNs. 2) It poses research questions about how CDNs and SDNs can provide assistance to HAS clients to improve delivery, and whether client assistance to networks could also be beneficial. 3) The state of the art involves standards for networks to provide information to clients, as well as some research on network-assisted HAS using traditional and SDN-enabled network architectures.
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Time: August 14, 10.00AM-10.30AM (CEST) or 1.30PM- 2.00PM (IST)
ZT: CDN_tutorial_adcom
This document provides an overview of content delivery networks (CDNs) and Akamai, the largest CDN provider. It discusses how CDNs work to distribute content across multiple servers located closer to end users to improve performance. It then describes Akamai's technology in more detail, including how it handles DNS resolution and redirects user requests to optimal servers to deliver content more efficiently than having all requests go to a single origin server.
Cdn tutorial adcom
This document provides an overview of content delivery networks (CDNs) and Akamai, the largest CDN provider. It discusses how CDNs work to distribute content across multiple servers located closer to end users to improve performance. It then describes Akamai's approach, which uses a proprietary system of algorithms and technologies to route users to optimal servers and replace website URLs with Akamai URLs to distribute embedded objects from Akamai servers. The document also outlines Akamai's global network and large market share in content delivery.
Sensors 17-00846-v2
This document discusses two real-time streaming protocols - Real Time Streaming Protocol (RTSP) and Web Real-Time Communication (WebRTC). It presents a comparative study of these two protocols by developing new mobile applications that implement each protocol on Android. The applications are analyzed based on connection establishment time and stream reception time, which influence quality of service. The applications are also compared to popular video streaming apps to evaluate stream packet delay, with results showing the WebRTC implementation improves upon other apps.
Doctoral Symposium presentation.pdf
Abstract: Rapid growth in multimedia streaming traffic over the Internet motivates the research and further investigation of the video coding performance of such services in terms of speed and Quality of Experience (QoE). HTTP Adaptive Streaming (HAS) is today’s de-facto standard to deliver clients the highest possible video quality. In HAS, the same video content is encoded at multiple bitrates, resolutions, framerates, and coding formats called representations. This study aims to (i) provide fast and compression-efficient multi-bitrate, multi-resolution representations, (ii) provide fast and compression-efficient multi-codec representations, (iii) improve the encoding efficiency of Video on Demand (VoD) streaming using content-adaptive encoding optimizations, and (iv) provide encoding schemes with optimizations per-title for live streaming applications to decrease the storage or delivery costs or/and increase QoE.
Collaborative Edge-Assisted Systems for HTTP Adaptive Video Streaming
The document proposes ARARAT, a collaborative edge-assisted framework for HTTP adaptive video streaming. ARARAT uses edge servers and an SDN controller to optimize video quality and network utilization. It formulates the problem as a MILP model to determine the optimal location and approach for serving each request. The framework includes local and fine-grained optimization models to allocate resources like bandwidth across edge servers.
USuurey_Presentation__CollaborativeHASSystems.pdf
The document proposes ARARAT, a collaborative edge-assisted framework for HTTP adaptive video streaming. ARARAT uses edge servers and an SDN controller to optimize video quality and network utilization. It formulates the problem as a MILP model to determine the optimal location and approach for serving each request. The framework includes local and fine-grained optimization models to allocate resources like bandwidth across edge servers.
Analyzing Video Streaming Quality by Using Various Error Correction Methods o...
Transmission video over ad hoc networks has become one of the most important and interesting subjects of study for researchers and programmers because of the strong relationship between video applications and frequent users of various mobile devices, such as laptops, PDAs, and mobile phones in all aspects of life. However, many challenges, such as packet loss, congestion (i.e., impairments at the network layer), multipath fading (i.e., impairments at the physical layer) [1], and link failure, exist in transferring video over ad hoc networks; these challenges negatively affect the quality of the perceived video [2].This study has investigated video transfer over ad hoc networks. The main challenges of transferring video over ad hoc networks as well as types of errors that may occur during video transmission, various types of video mechanisms, error correction methods, and different Quality of Service (QoS) parameters that affect the quality of the received video are also investigated.
LwTE-Live: Light-weight Transcoding at the Edge for Live Streaming
Live video streaming is widely embraced in video services, and its applications have attracted much attention in recent years. The increased number of users demanding high quality (e.g., 4K resolution) live videos increase the bandwidth utilization in the backhaul network. To decrease bandwidth utilization in HTTP Adaptive Streaming (HAS), in on-the-fly transcoding approaches, only the highest bitrate representation is delivered to the edge, and other representations are generated by transcoding at the edge. However, this approach is inefficient due to the high transcoding cost. In this paper, we propose a light-weight transcoding at the edge method for live applications, LwTE-Live, to decrease the band-width utilization and the overall live streaming cost. During the encoding processes at the origin server, the optimal encoding decisions are saved as metadata, and the metadata replaces the corresponding representation in the bitrate ladder. The significantly reduced size of the metadata compared to its corresponding representation decreases the bandwidth utilization. The extracted metadata is then utilized at the edge to decrease the transcoding time. We formulate the problem as a Mixed-Binary Linear Programming (MBLP) model to optimize the live streaming cost, including the bandwidth and computation costs. We compare the proposed model with state-of-the-art approaches and the experimental results show that our proposed method saves the cost and backhaul bandwidth utilization up to 34% and 45%, respectively.
CAdViSE or how to find the Sweet Spots of ABR Systems
With the recent surge in Internet multimedia traffic, the enhancement and improvement of media players, specifically DASH media players happened at an incredible rate. DASH Media players take advantage of adapting a media stream to the network fluctuations by continuously monitoring the network and making decisions in near real-time. The performance of algorithms that are in charge of making such decisions was often difficult to be evaluated and objectively assessed.
CAdViSE provides a Cloud-based Adaptive Video Streaming Evaluation framework for the automated testing of adaptive media players. In this talk, I will introduce the CAdViSE framework, its application, and propose the benefits and advantages that it can bring to every web-based media player development pipeline. To demonstrate the power of CAdViSE in evaluating Adaptive Bitrate (ABR) algorithms I will exhibit its capabilities when combined with objective Quality of Experience (QoE) models. For this talk, my team at Bitmovin/ATHENA has selected the ITU-T P.1203 (mode 1) model in order to execute experiments and calculate the Mean Opinion Score (MOS), and better understand the behavior of a set of well-known ABR algorithms in a real-life setting. The talk will display how we tested and deployed our framework using a modular architecture into a cloud infrastructure. This method yields a massive growth to the number of concurrent experiments and the number of media players that can be evaluated and compared at the same time, thus enabling maximum potential scalability. In my team’s most recent experiments, we used Amazon Web Services (AWS) for demonstration purposes. Another awesome feature of CAdViSE that will be discussed here is the ability to shape the test network with endless network profiles. To do so, we used a fluctuation network profile and a real LTE network trace based on the recorded internet usage of a bicycle commuter in Belgium.
CAdViSE produces comprehensive logs for each media streaming experimental session. These logs can then be applied against different goals, such as objective evaluation to stitch back media segments and conduct subjective evaluations afterwards. In addition, startup delays, stall events, and other media streaming defects can be imitated exactly as they happened during the experimental streaming sessions.
HTTP Adaptive Streaming – Quo Vadis? (2023)
Video traffic on the Internet is constantly growing; networked multimedia applications consume a predominant share of the available Internet bandwidth. A major technical breakthrough and enabler in multimedia systems research and of industrial networked multimedia services certainly was the HTTP Adaptive Streaming (HAS) technique. This resulted in the standardization of MPEG Dynamic Adaptive Streaming over HTTP (MPEG-DASH) which, together with HTTP Live Streaming (HLS), is widely used for multimedia delivery in today’s networks. Existing challenges in multimedia systems research deal with the trade-off between (i) the ever-increasing content complexity, (ii) various requirements with respect to time (most importantly, latency), and (iii) quality of experience (QoE). Optimizing towards one aspect usually negatively impacts at least one of the other two aspects if not both. This situation sets the stage for our research work in the ATHENA Christian Doppler (CD) Laboratory (Adaptive Streaming over HTTP and Emerging Networked Multimedia Services; https://athena.itec.aau.at/), jointly funded by public sources and industry. In this talk, we will present selected novel approaches and research results of the first year of the ATHENA CD Lab’s operation. We will highlight HAS-related research on (i) multimedia content provisioning (machine learning for video encoding); (ii) multimedia content delivery (support of edge processing and virtualized network functions for video networking); (iii) multimedia content consumption and end-to-end aspects (player-triggered segment retransmissions to improve video playout quality); and (iv) novel QoE investigations (adaptive point cloud streaming). We will also put the work into the context of international multimedia systems research.
Cgmm presentation on distributed multimedia systems
It is a presentation giving an overview about distributed multimedia systems, covering the basics of dmms.
Similar to MMSys'21 DS- RezaFarahani.pdf (20)
QoE- and Energy-aware Content Consumption for HTTP Adaptive Streaming
QoE- and Energy-aware Content Consumption for HTTP Adaptive Streaming
Optimal Rate Allocation and Lost Packet Retransmission in Video Streaming
Optimal Rate Allocation and Lost Packet Retransmission in Video Streaming
Optimizing User QoE through Overlay Routing, Bandwidth ...
Optimizing User QoE through Overlay Routing, Bandwidth ...
Multi-Criteria Optimization of Content Delivery within the Future Media Internet
Multi-Criteria Optimization of Content Delivery within the Future Media Internet
Video Coding Enhancements for HTTP Adaptive Streaming
Video Coding Enhancements for HTTP Adaptive Streaming
Collaborative Edge-Assisted Systems for HTTP Adaptive Video Streaming
Collaborative Edge-Assisted Systems for HTTP Adaptive Video Streaming
Analyzing Video Streaming Quality by Using Various Error Correction Methods o...
Analyzing Video Streaming Quality by Using Various Error Correction Methods o...
LwTE-Live: Light-weight Transcoding at the Edge for Live Streaming
LwTE-Live: Light-weight Transcoding at the Edge for Live Streaming
CAdViSE or how to find the Sweet Spots of ABR Systems
CAdViSE or how to find the Sweet Spots of ABR Systems
Cgmm presentation on distributed multimedia systems
Cgmm presentation on distributed multimedia systems
More from Reza Farahani
IEEE_ICC'23_SARENA.pdf
The document proposes SARENA, an architecture that leverages SDN, SFC, and edge computing to efficiently deliver video streams with different QoE requirements. SARENA includes virtual proxy, cache, and transcoding functions distributed across the edge and infrastructure layers. An optimization model and heuristic solve for optimal service function chains and resource allocation to maximize QoE. An evaluation in a large-scale testbed showed SARENA improved users' QoE by 39.6%, latency by 29.3%, and network utilization by 30% compared to baseline approaches. Future work includes reinforcement learning methods and FaaS-enabled solutions.
RAW23-Reza.pdf
"Unveiling the Potential of the Edge-Cloud Continuum:
A Deep Dive into Video Streaming and Graph Processing Use Cases" presented in EURO-PAR 2023
MHV_22__RICHTER_POSTER.pdf
RICHTER is a hybrid P2P-CDN architecture for low latency live video streaming that employs virtualized edge servers. It addresses challenges in CDN- and HAS-based streaming by leveraging characteristics of P2P networks and CDN systems. RICHTER utilizes peers' resources through a distributed transcoding approach in addition to video transmission. Virtual tracker servers located near base stations direct clients' requests and respond based on fetching content from peers, edge servers, CDN servers or origin server depending on latency. An optimization problem and heuristic approach are proposed to guide system operation and answer research questions on optimal placement, response approach, sufficient resources and seeder replacement.
MMSys2022-TowardsLLL-Poster.pdf
This document discusses challenges in achieving low latency live streaming in a real-world deployment. It notes that while HTTP adaptive streaming technologies allow for high quality video, supporting multiple streaming standards like DASH, HLS, and MSS increases complexity and latency. The document describes experiments testing how changing video format, segment duration, and DVR window length impact end-to-end latency on a testbed system. Shortening segment duration reduced latency while increasing the DVR window had a negative effect on latency.
IEEEGlobecom'22-OL-RICHTER.pdf
This document proposes a hybrid P2P-CDN architecture called RICHTER for live video streaming. RICHTER leverages NFV and edge computing to employ virtual transcoding servers that optimize content delivery by intelligently selecting whether to fetch or transcode content from peers, CDNs or the origin server. An online learning approach is used to solve the NP-hard optimization problem. Evaluation on a large-scale testbed shows RICHTER improves QoE, latency and network utilization compared to baseline schemes. Future work includes extending the action classification tree.
CSDN_ CDN-Aware QoE Optimization inSDN-Assisted HTTP Adaptive Video Streaming...
1) The document presents CSDN, a framework that leverages SDN and NFV to provide network assistance for HTTP adaptive video streaming. It proposes using SDN virtual routers equipped with transcoding capabilities to optimize quality of experience (QoE) based on network conditions and user preferences.
2) An evaluation of CSDN on a testbed with 100 clients showed it improved playback bitrate by 7.5% and reduced quality switches and stalls by 19% compared to state-of-the-art approaches, enhancing user QoE and network utilization.
3) Future work directions include improving edge caching strategies, developing learning-based approaches, and extending an MILP model to optimize transcoding
ACM NOSSDAV'21-ES-HAS_ An Edge- and SDN-Assisted Framework for HTTP Adaptive ...
The document presents ES-HAS, an edge- and SDN-assisted framework for HTTP adaptive video streaming. ES-HAS leverages SDN and NFV paradigms to provide network assistance for video streaming. It introduces virtual reverse proxy servers at the network edge that employ a novel server/segment selection policy. An evaluation on a large-scale cloud testbed with 60 clients shows that ES-HAS outperforms state-of-the-art approaches in terms of playback bitrate and number of stalls by at least 70% and 40% respectively. Future work directions include extending edge caching and collaboration as well as improving the proposed optimization model.
Basic Security in Routing and Switching
This slide covers fundamental of security in R&S and critical things about AAA and secure tunneling by IPSEC.
In this slide that I thought it at TIC company, you can find important terms about security and after that you can enhance your device configuration.
Quality of Service(Queuing Methods)
This slide contains fundamental concept about Quality of Service (QoS) technology and various types of Queuing Methods, according to the latest version of Cisco books (CCIE R&S and CCIE SP) and i taught it at IRAN TIC company.
Fundamental of Quality of Service(QoS)
This slide contains fundamental concept about Quality of Service (QoS) technolog, according to the latest version of Cisco books (CCIE R&S and CCIE SP) and i taught it at IRAN TIC company.In the next slide, i upload advanced topic about this attractive technology.
VPLS Fundamental
this slide contains fundamental concept about VPLS protocol, according to the latest version of Cisco books and i taught it at IRAN TIC company.in the next slide, i upload attractive advanced feature about VPLS.
(Some of the pictures in this slide are borrowed from the wonderful site of my good friend Gokhan Kosem)
(www.ipcisco.com)
Mpls L3_vpn
MPLS L3 VPN allows companies to offer Layer 3 VPN services with advantages like scalability, security, and support for duplicate IP addresses and different network topologies. The key components that enable this are VRF tables on PE routers that separate routing information for each customer to avoid duplicate IP issues, and MP-BGP which customizes VPN routing information using a Route Distinguisher, VPN label, and Route Target to support different VPN topologies. MPLS L3 VPN provides services like multi-homed sites for redundancy, hub-and-spoke networks, internet access with security, and extranets for inter-company communication.
MPLS & BASIC LDP
This slide contains basic concept about MPLS and LDP protocol, according to the latest version of Cisco books(SP and R&S) and i taught it at IRAN TIC company.
i will prepare MPLS_VPN and MPLS_QoS and MPLS_TE later.
OSPF Fundamental
This slide contains the basic and advanced concept of OSPF routing protocol, according to the latest version of Cisco books, and I presented it at IRAN TIC company. In the next slide, I will upload an attractive advanced feature about OSPF.
BGP
The document provides an overview of the Border Gateway Protocol (BGP) including:
- BGP establishes neighbor relationships to exchange routing information between autonomous systems (ASes). It uses path attributes like AS_PATH to choose the best route and prevent routing loops.
- BGP classifies neighbors as internal (iBGP) or external (eBGP) depending on if they are in the same AS or different ASes. iBGP does not modify the AS_PATH while eBGP does.
- Techniques like route reflectors, confederations, and multiprotocol BGP are used to improve scalability within large ASes. Route filtering uses features like prefix-lists, route-maps and regular expressions to control route
More from Reza Farahani (15)
CSDN_ CDN-Aware QoE Optimization inSDN-Assisted HTTP Adaptive Video Streaming...
CSDN_ CDN-Aware QoE Optimization inSDN-Assisted HTTP Adaptive Video Streaming...
ACM NOSSDAV'21-ES-HAS_ An Edge- and SDN-Assisted Framework for HTTP Adaptive ...
ACM NOSSDAV'21-ES-HAS_ An Edge- and SDN-Assisted Framework for HTTP Adaptive ...
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一比一原版(CalArts毕业证)加利福尼亚艺术学院毕业证如何办理
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Computational Engineering IITH Presentation
This Presentation will give you a brief idea about what Computational Engineering at IIT Hyderabad has to offer.
学校原版美国波士顿大学毕业证学历学位证书原版一模一样
原版一模一样【微信：741003700 】【美国波士顿大学毕业证学历学位证书】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
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Electric vehicle and photovoltaic advanced roles in enhancing the financial p...
Climate change's impact on the planet forced the United Nations and governments to promote green energies and electric transportation. The deployments of photovoltaic (PV) and electric vehicle (EV) systems gained stronger momentum due to their numerous advantages over fossil fuel types. The advantages go beyond sustainability to reach financial support and stability. The work in this paper introduces the hybrid system between PV and EV to support industrial and commercial plants. This paper covers the theoretical framework of the proposed hybrid system including the required equation to complete the cost analysis when PV and EV are present. In addition, the proposed design diagram which sets the priorities and requirements of the system is presented. The proposed approach allows setup to advance their power stability, especially during power outages. The presented information supports researchers and plant owners to complete the necessary analysis while promoting the deployment of clean energy. The result of a case study that represents a dairy milk farmer supports the theoretical works and highlights its advanced benefits to existing plants. The short return on investment of the proposed approach supports the paper's novelty approach for the sustainable electrical system. In addition, the proposed system allows for an isolated power setup without the need for a transmission line which enhances the safety of the electrical network
LLM Fine Tuning with QLoRA Cassandra Lunch 4, presented by Anant
Slides for the 4th Presentation on LLM Fine-Tuning with QLoRA Presented by Anant, featuring DataStax Astra
Use PyCharm for remote debugging of WSL on a Windo cf5c162d672e4e58b4dde5d797...
This document serves as a comprehensive step-by-step guide on how to effectively use PyCharm for remote debugging of the Windows Subsystem for Linux (WSL) on a local Windows machine. It meticulously outlines several critical steps in the process, starting with the crucial task of enabling permissions, followed by the installation and configuration of WSL.
The guide then proceeds to explain how to set up the SSH service within the WSL environment, an integral part of the process. Alongside this, it also provides detailed instructions on how to modify the inbound rules of the Windows firewall to facilitate the process, ensuring that there are no connectivity issues that could potentially hinder the debugging process.
The document further emphasizes on the importance of checking the connection between the Windows and WSL environments, providing instructions on how to ensure that the connection is optimal and ready for remote debugging.
It also offers an in-depth guide on how to configure the WSL interpreter and files within the PyCharm environment. This is essential for ensuring that the debugging process is set up correctly and that the program can be run effectively within the WSL terminal.
Additionally, the document provides guidance on how to set up breakpoints for debugging, a fundamental aspect of the debugging process which allows the developer to stop the execution of their code at certain points and inspect their program at those stages.
Finally, the document concludes by providing a link to a reference blog. This blog offers additional information and guidance on configuring the remote Python interpreter in PyCharm, providing the reader with a well-rounded understanding of the process.
Comparative analysis between traditional aquaponics and reconstructed aquapon...
The aquaponic system of planting is a method that does not require soil usage. It is a method that only needs water, fish, lava rocks (a substitute for soil), and plants. Aquaponic systems are sustainable and environmentally friendly. Its use not only helps to plant in small spaces but also helps reduce artificial chemical use and minimizes excess water use, as aquaponics consumes 90% less water than soil-based gardening. The study applied a descriptive and experimental design to assess and compare conventional and reconstructed aquaponic methods for reproducing tomatoes. The researchers created an observation checklist to determine the significant factors of the study. The study aims to determine the significant difference between traditional aquaponics and reconstructed aquaponics systems propagating tomatoes in terms of height, weight, girth, and number of fruits. The reconstructed aquaponics system’s higher growth yield results in a much more nourished crop than the traditional aquaponics system. It is superior in its number of fruits, height, weight, and girth measurement. Moreover, the reconstructed aquaponics system is proven to eliminate all the hindrances present in the traditional aquaponics system, which are overcrowding of fish, algae growth, pest problems, contaminated water, and dead fish.
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原版一模一样【微信：741003700 】【(爱大毕业证书)爱荷华大学毕业证成绩单】【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
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- 1. CDN and SDN Support and Player Interaction for HTTP Adaptive Video Streaming ACM MMSys 2021 Doctoral Symposium September 30th , 2021 Reza Farahani reza.farahani@aau.at | https://athena.itec.aau.at/
- 2. 2 Agenda ● Introduction ● Research Questions ● State of the art ● Publications and future work
- 4. ● Video traffic has become the dominant traffic over the Internet. ● It is expected to reach more than 82% of all Internet traffic by 2022 [1]. ● HTTP adaptive streaming (HAS) has been considered as the de-facto video delivery technology over the Internet. Introduction-Video Streaming 4 [1] Cisco. Global - 2021 Forecast Highlights. https://www.cisco.com/c/dam/m/en_us/solutions/service-provider/vni-forecast-highlights/pdf/Global_2021_Forecast_Highlights.pddf
- 5. ● The adaptation process can be performed with different schemes: ○ Pure client-based: ■ The decision based on the local parameters, e.g., ● buffer status ● estimated available bandwidth ■ Insufficient information about the network ● It can lead to a suboptimal adaptation decision ○ Network-assisted: ■ The decision is performed via a centralized network component with a global view of the entire network topology. ■ can be more beneficial for the users’ QoE ● Fundamental paradigms of modern networks, i.e., SDN, NFV, edge computing have been used in modern network-assisted frameworks Introduction- Network-assisted video streaming 5
- 6. ● The fundamental paradigm of modern networks to address the limitations of conventional network architecture like: ○ Complex Network Devices ○ Management Overhead ○ Limited Scalability ● The control plane (forwarding decision) is decoupled from the data plane (acts on the forwarding decision) ○ Centralized Network Controller ○ Standard communication Interface (OpenFlow), ○ Programmable Open APIs ● SDN is deployed in a wide range of network types: ○ Enterprise, campus, datacenter, wide-area networks (Google B4) Introduction-Software-Defined Networking (SDN) 6
- 8. 1. How SDNs/CDNs provide assistance for HAS clients in order to improve media delivery services? ● Send information provided from SDN controller, CDN servers, or intermediate devices like Reverse Proxy server to HAS client. ○ Network map ○ Path information ○ Cache occupancy ○ Throughput measurements ○ Throughput predictions Research Questions 8
- 9. ● The SDN controller could employ the following information provided by HAS clients for caching, dynamic routing policies, etc. ○ User behavior ○ Content popularity ○ Content prefetching ○ Users requests patterns ○ Representation selection hints ● HAS clients can be used in a hybrid Peer-to-Peer (P2P)/CDN for: ○ low-latency video streaming ○ improve network bandwidth usage ○ enhance CDN performance. ○ Research Questions 9 2. Will assistance by HAS clients for the SDNs/CDNs (and client-network collaboration) work, which assistance, how?
- 10. 3. What is the utility of the proposed assistance and collaboration service? ● QoE parameters: ○ Average quality bitrate, Number of quality switches, Rebuffering, etc. ● CDN utilization: ○ Cache hit rates, Bandwidth/Storage consumption, Server load ● QoS parameters: ○ Delay, Throughput, etc ● Network utilization: ○ Backhaul and transit bandwidth ● SDN controller’s load ○ Messages to/from the controller ● Content providers’ costs ○ Bitrate ladder 4. How can the utility be thoroughly evaluated, both in theoretical and synthetic settings and in practice? ● Simulation, emulation, and testbed experiments Research Questions 10
- 11. State of the art 11
- 12. State of the art 12 ● The IETF Working Group ALTO (Application-Layer Traffic Optimization) develops standards: ○ Allow applications to obtain network information(network map and the path costs), for ○ Optimizing server/CDN ○ surrogate selection ○ traffic delivery ● Akamai has a product called NetSession Interface: ○ Support peer-assisted delivery ○ Client-CDN cooperation ○ Software should install on the client device ● Network assistance for HAS clients for “traditional” network architectures.[1] ○ Asynchronous network-to-client and network-to-network communication without any delay ● Network assistance for HAS clients, by utilizing SDN capabilities[2] ● Network assistance for HAS clients through the combined SDN and CDN considerations[3] [1]E. Thomas, M. O. van Deventer, T. Stockhammer, A. C. Begen, J. Famaey, “Enhancing MPEG DASH Performance via Server and Network Assistance,” SMPTE Motion Imaging Journal, vol. 126, issue 1, Jan.-Feb. 2017. [2]A. Bentaleb, A. C. Begen, S. Harous, R. Zimmermann, “SDNHAS: An SDN-Enabled Architecture to Optimize QoE in HTTP Adaptive Streaming,” in IEEE Transactions on Multimedia, vol. 19, no. 10, pp. 2136-2151, Oct. 2017. [3]D. Bhat, A. Rizk, M. Zink, R. Steinmetz, “Network Assisted Content Distribution for Adaptive Bitrate Video Streaming,” In Proceedings of the 8th ACM Multimedia Systems Conference (MMSys '17), pp. 62-75, June 2017
- 13. 13 Publications and ongoing work
- 14. ES-HAS: An Edge- and SDN-Assisted Framework for HTTP Adaptive Video Streaming 14 Farahani, R., Tashtarian, F., Erfanian, A., Timmerer, C., Ghanbari, M. and Hellwagner, H., 2021, October. ES-HAS: An Edge- and SDN-Assisted Framework for HTTP Adaptive Video Streaming,” in ACM NOSSDAV, 2021.(pp. 50-57).
- 15. CSDN: CDN-Aware QoE Optimization in SDN-Assisted HTTP Adaptive Video Streaming 15 Farahani, R., Tashtarian, F., Amirpour, H., Timmerer, C., Ghanbari, M. and Hellwagner, H., 2021, October. CSDN: CDN-Aware QoE Optimization in SDN-Assisted HTTP Adaptive Video Streaming. In 2021 IEEE 46th Conference on Local Computer Networks (LCN) (pp. 525-532).
- 16. ● Devise Network-assisted systems for HAS clients that uses edge collaboration technique ● Devise a Hybrid P2P/CDN system to provide low latency live video streaming service ● Deploy a network-assisted HAS system to improve users’ QoE by optimizing the set of video representations Ongoing and future Work All rights reserved. ©2020 16
- 17. Thank you for your attention reza.farahani@aau.at | https://athena.itec.aau.at/ All rights reserved. ©2020 17