Quality of Experience

Caching video at the network edge improves subscriber QoE by up to 130%

Video Quality of Service with Open Caching - How it Works

In a highly competitive market where end user satisfaction ranks among top differentiators, the importance of subscriber video Quality of Experience (QoE) reigns supreme. And as the amount of video traffic continues to increase, many end users experience degraded video and broadband service quality due to network congestion, especially during peak consumption periods – resulting in subscriber dissatisfaction and the subsequent customer turnover.

Key Factors Affecting QoE

Although network speed fluctuations may not be as noticeable during web browsing or downloading files, they become clearly apparent when they disrupt a video stream. Lengthy start-up delays, buffering, and Adaptive Bit Rate (ABR) resolution fluctuations all lead to viewer abandonment.

How Open Caching Improves QoE

By using open caching and serving the majority of popular video content from the network edge, service providers can vastly improve the end user experience by eliminating and reducing potential bottlenecks in the network.

Open Caching Improves Video Quality of Service for Subscribers

Delivering the majority of bandwidth-intensive media content in close proximity to the subscribers reduces the network congestion caused by traversing video traffic, minimizes latency, preserves content fidelity, and frees up bandwidth for other services to further improve customer satisfaction.

Measuring Quality of Experience

The most widely accepted measure of video QoE is average bit rate – the average bandwidth being consumed by the video stream from origin server to the client viewing the content. The bit rate may vary for each video being streamed based on the resolution, the quality of the viewing screen, available bandwidth in the network path and congestion in the network. In the case of ABR, the bit rate may vary in real time during the stream based on network congestion.

So, during a period of time in which many videos are being streamed, the average of all streams or average bitrate for a specific content provider or a specific operator will be the best indicator of the quality of viewing experience for users.

A comparison of QoE for streaming video must measure the average bit rate of streams at the same point in time, within the same network and for the same content providers. With this data, we can compare the average bit rate for video streamed from an open cache with the average bit rate for a video originated further upstream from a content provider server.

How Much Does Open Caching Improve QoE?

Streaming video content served from Qwilt caches deployed within operator networks was consistently delivered at a higher QoE across all major content provider sites worldwide – with as much as 130% improvement at peak time in some regions.

Video Quality of Experience Improves by Over 130% With Transparent Caching

Real Results From Real Operator Networks

QoE Results from a Selected
European Network Operator

81% QoE Improvement with Open Caching by European Network Operator

Open Video Caching results in a 73.4% increase in the average bit rate of YouTube video during peak time. The YouTube stream delivered by Qwilt’s cache deployed inside the operator network averages 1.7Mbps compared to the 975Kbps average YouTube stream delivered content servers outside the network. Overall, open caching improves QoE for all cached sites by 94.8%, from an average bit rate of 562.9Kbps to 1.1Mbps during peak time. (Nov 2013) View Report

QoE Results from a Selected
South American Network Operator

98% QoE Improvement with Open Caching by European Network Operator

Open Video Caching results in a 108.2% increase in the average bit rate of YouTube video during peak time. The YouTube stream delivered by Qwilt’s cache deployed inside the operator network averages 3.6Mbps compared to the 1.7Mbps average YouTube stream delivered content servers outside the network. Overall, open caching improves QoE for all cached sites by 94.5%, from an average bit rate of 1.9Kbps to 3.8Mbps during peak time. (Nov 2013) View Report

QoE Results from a Selected
North American Network Operator

55% QoE Improvement with Open Caching by North American Network Operator

Open Video Caching results in a 83.6% increase in the average bit rate of Netflix video during peak time. The Netflix stream delivered by Qwilt’s cache deployed inside the operator network averages 2.6Mbps compared to the 1.4ps average Netflix stream delivered content servers outside the network. Overall, open caching improves QoE for all cached sites by 54.4%, from an average bit rate of 1.9Kbps to 2.9Mbps during peak time. (Nov 2013) View Report

QoE Results from a Selected
Asian Network Operator

133% QoE Improvement with Open Caching by Asian Network Operator

Open Video Caching results in a 543.8% increase in the average bit rate for Nicovideo, a popular Japanese video streaming site. The Nicovideo stream delivered by Qwilt’s cache deployed inside the operator network averages 3.5Mbps compared to the 542.1Kbps average stream delivered from Nicovideo content servers outside the operator network. Overall, open caching improves QoE for all cached sites by 94.8%, from an average bit rate of 562.9Kbps to 1.1Mbps. (Nov 2013) View Report

Why Operators Should Deploy Caching to Improve QoE

Reduce Customer Churn

By delivering an immersive video experience to the consumers while maintaining high quality of all other network services, operators improve subscriber satisfaction and prevent customer churn. By serving video content from the network edge, operators substantially reduce start-up times, eliminate buffering delays, and deliver video in the highest available fidelity even in the most congested network conditions – making viewing online video a consistently enjoyable and consistent experience for their consumers.

Open Caching Improves Customer Satisfaction

Monetize Video Delivery

With in-depth insights and metrics of video streaming service quality measurements, network operators can add premium video-streaming service plan enhancements to their product portfolios. By taking control of video delivery in their networks, operators can offer new video-focused consumer packages.

Optimize Video Delivery In Your Network

Whether your customers are watching over-the-top (OTT) content or downloading the latest flicks from the carrier’s VOD library, serving content from close proximity to the subscribers dramatically improves the end-user experience and preserves the content provider’s fidelity. By deploying a video caching system in their network, operators can ensure that their subscribers are enjoying a consistent, immersive video viewing experience – every time.

Optimize Video Delivery with Open Caching and Improve QoE

Reduce Bandwidth Consumption by Over 50% and Maximize Your Infrastructure Investment

By serving a large volume of content from the network edge, operators can maximize their existing infrastructure without having to constantly invest into expanding capacity. With a significant portion of traffic offloaded onto edge caches, all other bandwidth-sensitive non-cacheable applications like VoIP, video conferencing, and gaming see a substantial quality improvement – without any additional investment by the network operator. By deferring network-wide expansion spending and leveraging in-depth bandwidth performance analytics, operators can strategically invest into select areas of the network that need improvement.

Open Video Caching Saves Operators On Costly Infrastructure Upgrades

Video Fabric Controller

Next Generation Open Caching

Video Fabric Controller is an SDN-based Open Video Caching and Analytics Platform

Qwilt’s QB-Series Video Fabric Controller combines open caching, media delivery, and analytics in a turnkey, carrier-grade platform designed for caching and delivering OTT on-demand and live-streaming video.

World’s leading cable and broadband service providers rely on Qwilt for managing their video network infrastructure, delivering top quality viewing experience to their subscribers, and preparing their networks for the future of online video.

learn more