Microsoft Technology Licensing, LLC

Michael Lacher

Hadden Mark Hoppert

Quinn Damerell

Ivan Mladenov

Gabriel Young

Karthik Nallapeta Subramanya

A first logical link path and a second logical link path between two endpoints are identified. The first logical link path and the second logical link path comprise an OSI layer 5 link path from source to destination including intermediate network devices. The first logical link path and the second logical link paths include at least a different intermediate network device. A communications session is established between the two endpoints. Data packets for the communications session are communicated using the first logical link path. A metric indicative of a time of receipt of packets on the first logical link path is determined. Based on the metric, presence of a network condition at the communications network that is indicative of a performance degradation of the first logical link path is determined. In response, data packets for the communications session are communicated on the second logical link path.

Logical link redundant paths

A first data link and a second data link are established between two endpoints. For each of the first and second data links, a first metric is determined based on a first scaling factor for characterizing how quickly link health degrades over time, and a time at which a most recent packet was received on the respective data link. A second metric indicative is determined based on a second scaling factor for controlling how often to probe the first and second data links in addition to regular traffic. Based on the first and second metrics, one of the first or second data links is selected for sending a data packet.

Link health determination

In one example, a streaming server or a client device may measure an end-to-end time for a streaming operation in real time. The streaming server may store an input time associated with a user input and a frame presentation time associated with the frame output. The streaming server automatically may correlate the user input to the frame output generated at the streaming server in a frame generation process. The streaming server may calculate an end-to-end time based on the input time and the frame presentation time. The streaming server may adjust the frame generation process based on the end-to-end time.

Real-time end-to-end latency monitoring

In one example, a client device interacting with a streaming application server may synchronize an audio stream to a corresponding video stream. The client streaming device may have an audio channel to receive a current audio packet of an audio stream from a streaming application server. The client streaming device may have a video channel to receive a current video packet of a video stream from the streaming application server. The client streaming device may execute a media synchronization module to synchronize the audio stream to the video stream by measuring a video display time change for the video stream describing a video delay between generating video data at the streaming application server and displaying the video data at the streaming client device to a user. The client streaming device may execute an audio adjustment module to adjust an audio presentation time for the audio stream indicating when a subsequent audio packet is played to the user based on the video display time change.

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Redmond, WA, United States of America

Michael Lacher