Qualcomm Incorporated

Padam Lal Kafle

Vijay Naicker Subramaniam

Fawad Shaukat

Khosro Rabii

Shivakumar Balasubramanyam

Shivraj Singh Sandhu

Sanal Kumar Karunakaran

Reid Matthew Westburg

Sanjay Kumar Agrawal

Khosro Mohammed Rabii

Methods, systems, and devices are described for service discovery and session establishment framework to enable a synchronous audio/video streaming service from a source to multiple sink devices. In accordance with the present disclosure, a plurality of sink devices (e.g., Wi-Fi speakers) may be deployed in a flexible (e.g., plug-and-play) fashion and may be discoverable by the source device. In some examples, the devices from multiple vendors may interoperate and easily connect with the source device for flexible configuration based on the media content or number of available sink devices. Thus, the present disclosure provides a method for service specific discovery associated with synchronous audio/video streaming by utilizing Application Service Platform (ASP) service discovery prior to establishment of a display service session from a source device to multiple sink devices.

Discovery and management of synchronous audio or video streaming service to multiple sinks in wireless display system

Methods, systems, apparatuses, and devices are described for synchronizing timing of wireless streaming transmissions to multiple sink devices. A source device may identify timing information associated with a common timing source, e.g., a media timing source at Multimedia layer or a Wi-Fi timing source, and send the timing information to the sink devices. The sink devices may receive the timing information and determine a composite timing delay, e.g., a wireless transmission link delay, an internal interface link delay, or combinations thereof. The source device may stream the content to the sink devices which may use a locally adjusted timing signal to synchronize the presentation of the content.

Techniques for synchronizing timing of wireless streaming transmissions to multiple sink devices

Methods, systems, apparatuses, and devices are described for reverse channel audio (RCA) session establishment and management. A sink device may identify a unidirectional communication channel with a source device. The sink device may determine that a trigger is present, where the trigger is associated with a RCA transmission to the source device, and establish a RCA session for transmitting the RCA transmission to the source device based at least in part on the identified trigger. A source device may identify a unidirectional communication channel with a sink device and receive an indication that a sink device supports RCA transmissions, such as via the unidirectional communication channel. The source device may transmit a trigger to the sink device to initiate the RCA transmission, such as via the unidirectional communication channel, and receive the RCA transmission from the sink device based at least in part on the trigger.

Techniques to manage reverse channel audio sessions

Methods, systems, and devices are described for wireless communication. A source device of a wireless local area network (WLAN) may identify one or more attributes of a first wireless link and a second wireless link between the source device and a sink device of the WLAN. The one or more attributes may be compared with a source device connection policy associated with a streaming protocol. The source device may determine whether to establish a streaming session with the sink device over the first wireless link or the second wireless link based at least in part on the comparing.

Service discovery and topology management

Wireless communication devices are provided with direct video and audio streaming capability. The streaming capability may support overlays. Some implementations include incorporation of these features into devices with a mirroring display mode.

Synchronization and control of overlay contents for video streaming in a wireless communication system

Apparatuses and methods for wireless synchronization of multiple multimedia devices using a common timing framework are disclosed. In one aspect, a wireless multimedia source device is configured to establish wireless connections with a plurality of multimedia sink devices. The wireless multimedia source device is further configured to calculate a correction time interval for each multimedia sink device based on a difference between a master program clock reference (M) and a local program clock reference (L) feedback signal from the multimedia sink device. Presentation time stamp (PTS) data is generated based on the correction time interval and provided to the multimedia sink device. In another aspect, a wireless multimedia sink device is configured to receive a correction time interval based on a difference between an Mfor the multimedia source device and an Lfor the multimedia sink device, and calculate an updated Lbased on the correction time interval.

Apparatuses and methods for wireless synchronization of multiple multimedia devices using a common timing framework

Wireless communication devices are provided with direct video and audio streaming capability. The streaming capability may support overlays, and seek functionality. Some implementations include incorporation of these features into devices with a mirroring display mode such as Miracast.

Video streaming in a wireless communication system

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.

Session management and control procedures for supporting multiple groups of sink devices in a peer-to-peer wireless display system

Dynamic control of transport protocols utilized in the streaming of media content based in part on the type of content, latency requirements, network conditions and/or device capabilities is described. The techniques provide a source device to dynamically switch between User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) to stream media content to a sink device. For example, during a Wi-Fi peer-to-peer remote display session associated with real-time media content (e.g., live streaming sporting event, or gaming applications), the source device may utilize Real-time Transport Protocol (RTP) over UDP to transmit the media stream to the sink device. Conversely, when the media content is not latency critical, such as playback of stored media (e.g., movie), the source device may dynamically switch to RTP over TCP in order to provide reliable data transmission.

Streaming control for real-time transport protocol

Methods, systems, and devices are described for using a back channel for communicating in a Wi-Fi peer-to-peer remote display connection. A Wi-Fi peer-to-peer remote display connection may be established with a source device. Communications may be transmitted from a sink device to the source device using a back channel of the Wi-Fi peer-to-peer remote display connection. The sink device may connect with a plurality of source devices. A plurality of input streams may be multiplexed into a single output stream. The single output stream may be distributed to the plurality of source devices using back channels of the Wi-Fi peer-to-peer remote display connection. In addition, a source device may connect, via a wired connection, with a sink device. Wi-Fi connection parameters may be exchanged with the wired connection. A Wi-Fi peer-to-peer connection may be established based at least in part on the Wi-Fi connection parameters.

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San Diego, CA, United States of America

Padam Lal Kafle