Group Session Management for Wireless Display Streaming
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Solution Overview
Problem
The current Miracast specification primarily handles session establishment and control for multimedia streaming from one source to one sink device, lacking support for streaming to multiple sink devices, which results in complexity, bandwidth limitations, and interoperability issues when trying to share media content with multiple devices.
Innovation Solution
The proposed solution extends the RTSP control plane for peer-to-peer streaming to manage a group of sink devices, using group-based PES, MPEG2-TS transport, and RTP packetization, along with MAC layer capabilities for efficient session parameter setting and group address frame delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current Miracast specification is used for streaming to multiple sink devices, then session establishment and control can be maintained, but the system complexity increases and bandwidth requirements become excessive
Solution Approach 1:
The patent merges multiple individual sink devices into a single group entity represented by a group GB. The source device establishes one P2P connection to the group instead of maintaining separate connections to each sink device. This consolidation reduces system complexity while maintaining reliable session management through the group representative architecture.
Solution Approach 2:
The group GB acts as an intermediary between the source device and multiple sink devices. The group receives multimedia content from the source and distributes it to individual sink devices. This intermediary architecture simplifies session control at the source while enabling efficient content delivery to multiple devices without increasing source device complexity.
2Ease of operation
If separate P2P connections are established to each sink device, then individual device control is maintained, but bandwidth requirements increase and interoperability issues arise
Solution Approach 1:
The patent combines multiple individual transmission channels into a single group channel. Instead of establishing separate P2P connections to each sink device, the source device establishes one connection to the group GB. This merging reduces bandwidth requirements at the source while maintaining the ability to control and deliver content to individual sink devices through group-based distribution.
3Adaptability or versatility
If the current Miracast specification is extended to support multiple sink devices, then content sharing capability is improved, but interoperability issues increase
Solution Approach 1:
The patent creates a universal group-based interface that works across different sink devices. The group GB provides a standardized mechanism for the source device to share content with multiple sinks regardless of their individual capabilities. This universal group architecture improves content sharing capability while maintaining interoperability through standardized group management protocols.
Data Source
AI summary
An apparatus and method for session management and control procedures for supporting multiple groups of sink devices in a peer-to-peer wireless display system are described. One implementation may include an apparatus configured to transmit multimedia content to a plurality of sink devices. The apparatus may comprise a processor configured to connect to each of the sink devices with a Wi-Fi peer-to-peer connection. The processor may further be configured to receive capability information from each of the sink devices. The processor may further be configured to generate a control message including a group session ID and a transport port number. The processor may further be configured to determine a set of streaming parameters for the sink devices. The processor may further be configured to transmit, using the transport port number and according to the set of streaming parameters, the particular multimedia content to each of the Wi-Fi peer-to-peer connected sink devices.