4layersThere are 4 Logical Layers within OVS Overlay Network, which extends Onwards CDN solution to provides application functions and value added solutions.

The 4 layers: (from bottom to top)

1. Link Layer
2. Media Layer
3. Support Layer
4. Interactive Layer

Link Layer

The OVS Link Layer is the foundation of OVS, which initially was for communications between servers node, then later extended to client nodes where NAT applied.

The core value of the layer is to provide fast node discovery and connections in the network; data flow control, which includes the ability to cache and share data; mechanism of acknowledgement and retransmission whenever there is data loss.

Functionally, the Link Layer work tightly with CDN system which data is cached and transmitted by the nearest node. OVS not only increased the speed of data received by the end node, but the bandwidth out of source and edge servers are also greatly reduced.

LinkLayer

Media Layer

The OVS Media Layer is designed to overcome the fact that existing CDN and traditional video transmission network adapt to the variations of devices and network. Hence we overlay the Media Layer which enables the same media data can be supported by different devices and networks.The core value of the layer is to handle media codec, make sure the content integrity, provide buffer control for devices with limited recourses, and protocol construction so that media can be delivered and displayed on targeted devices and network correctly.

Media Layer

Support Layer

OVS Support Layer provides real time interface for user viewing experience detection. This is a great differentiation to most of the OTT service provides, which can only provide best effort service.The Support Layer is exceptionally importance when the trend is OTT, which means to provide video service through an uncontrolled network. The main functions of this layer is to provide QoS, individual node playback monitoring, system security and network tuning.The data about viewing habit / experience of user from this support layer interface is importance for the 3 real world entities, OSS / Customer Support, Product and Marketing and Service and Advertising Agents.

Support Layer

Interactive Layer

The OVS Interactive Layer is the natural extension of the real-time support layer, which provides what future video product needed. The interactive layer allows real-time data announcement to the target nodes.There is an interface from the Interactive Layer which allows interactive marketing campaign like poling and coupon, real-time advertisement, even pre-paid service and boundless integration of applications. Once service provider integrates with the API of the layer, then they can access all real-time viewers.

Interactive Layer