DASH MPD Session Management via Event Descriptors

The patent introduces an intermediary mechanism (session manager and event descriptors) between the HTTP protocol layer and the DASH client to bridge the stateless nature of HTTP with the stateful session management requirements. The session manager acts as a mediator that tracks client sessions and enforces ad insertion rules, while event descriptors serve as intermediaries to communicate timing and restriction information from the server to the client without requiring changes to the underlying HTTP protocol.

The patent implements feedback mechanisms through event descriptors that provide timing information and session state updates back to the client. The server sends event information that feedback to the client about session state, ad insertion timing, and content restrictions, enabling the client to adjust its behavior accordingly while maintaining the stateless HTTP protocol foundation.

The patent applies preliminary action by providing the client with ad content download information and restrictions in advance through event descriptors before the actual content playback. The server pre-specifies ad insertion points, download URLs, and timing constraints in the MPD file and event descriptors, allowing the client to prepare ad content downloads ahead of time while the server maintains control over when and how ads are delivered.

The patent introduces dynamic elements through event descriptors that can be updated and modified during the streaming session. The event information can change based on network conditions, client state, and server decisions, allowing the ad delivery control mechanism to adapt dynamically while maintaining server authority over the ad insertion process.

The patent segments the session management functionality into distinct components: session managers on both server and client sides, event descriptors for timing and restriction information, and separate ad content delivery mechanisms. This segmentation allows each component to handle specific aspects of session management independently, reducing overall protocol complexity while enabling sophisticated revenue monetization capabilities.

The event descriptor mechanism serves multiple functions simultaneously: it provides timing information for ad insertion, specifies content restrictions, communicates session state, and enables targeted ad delivery. This multi-functionality reduces the need for separate protocol elements for each feature, thereby limiting the increase in protocol complexity while achieving revenue monetization goals.