Microsoft Technology Licensing, LLC

Microsoft Corporation

Costin Hagiu

Dale Alan Sather

Rajneesh Mahajan

Rafael S Lisitsa

Hammad Butt

Sanjeev Mehrotra

Ashwin Palekar

Ara Bernardi

Mahesh Sharad Lotlikar

Nadim Y Abdo

Sriram Sampath

Weidong Zhao

Vladimir Stoyanov

Joy Chik

Graham Edward Fagg

Jayashree Sadagopan

Guatam Swaminathan

Moshe Zilberstein

Lihua Zhu

B Anil Kumar

Nelamangal Krishnaswamy Srinivas

Sridhar Sankuratri

Wilhelm R Schmieder

Makarand V Patwardhan

John E Parsons

Elton Saul

Shir Aharon

Jeroen E Van Eesteren

Huei Chung Wang

Sergey A Kuzin

Yongjun Wu

Paul J Leach

Arun Upadhyaya Kishan

Shyam Sadhwani

Cristian Marius Ilac

Nk Srinivas

Bryan A Woodruff

Yue Chen

George H J Shaw

Tong L Wynn

Voicu Anton Albu

John E Parsons, Jr

Gennady Medvinsky

Olga Ivanova

Damien Gerard Saint Macary

Srinivasa Reddy Neerudu

Tarek Bahaa El-Din Mahmoud Kamel

Rouslan Beletski

Karthik Thirumalai

Benjamin Meister

Ahmed M Tolba

Vishal D Maru

Gautam Swaminathan

Anurekh Saxena

Seema J Lukose

Madhanmohan Neethiraj

Gabriel Hera

Mohamed Emad El Din Fathalla

Benjamin Homelson Meister

Tarek Buhaa El-Din Mahmoud Kamel

Mohamed Emad Fathalla

Tarek Buhaa Kamel

Mahesh Lotlikar

Cristian Ilac

Technologies are described for performing equation-based rate control using delay. For example, an observed network data rate and a network delay can be obtained for a network communication. A target network data rate can be calculated using the observed network data rate and the network delay. The target network data rate is calculated using an equation-based approach. For example, the equation-based rate control can set the target network data rate to a value that is directly proportional to the observed network data rate and inversely related to the network delay. The target network data rate is used to set the bitrate for the network communication.

Equation-based rate control using network delay for variable bitrate scenarios

In various embodiments, methods and systems are disclosed for the real time detection of network conditions in conjunction with a remote presentation protocol. The link quality may represent the quality of the end-to-end connection between client and server with upper and lower bounds on the injection of additional traffic used for measurement. In some embodiments, the measurement technique may be selected based on the type of measurement that is desired. Accuracy may be maintained by selecting the type of measurement used based on current and previous network conditions. In one embodiment, a state model is used to determine the frequency of measurement and to determine when the measurements have produced a stable estimate of the link quality.

Detection of end-to-end transport quality

Technologies are described for performing hybrid rate control that switches between a delay-based mode and a passive loss-based mode for a flow of network traffic. The switching can be performed based on the presence of loss-based TCP network flows. For example, rate control can be performed for a flow of network traffic in a delay-based mode. When the presence of a loss-based TCP network flow is detected, the flow of network traffic can be switched from the delay-based mode to a passive loss-based mode and rate control can be performed in the passive loss-based mode. When the loss-based TCP flow is no longer detected, the flow of network traffic can be switched back to the delay-based mode.

Delay based congestion control protocol co-existing with TCP

Variations of rho-domain rate control for video encoding or other media encoding are presented. For example, in some of the variations, an encoder sets a rho value for a unit of media based at least in part on a bit allocation for the unit. The encoder also computes transform coefficients for the unit using a frequency transform having multiple location-dependent scale factors, sets a value of quantization parameter ('QP') for the unit using a mapping of QP values to rho values, and uses the value of QP for the unit during quantization of the transform coefficients of the unit. When the QP-rho mapping is determined, a location-independent scale factor that approximates the multiple location-dependent scale factors is used and/or certain scaling operations are integrated, which reduces computational complexity while still supporting accurate rate control decisions. Implementations of such variations of rate control can exploit opportunities for caching and parallel computation.

Variations of rho-domain rate control

Innovations in encoding and decoding of video pictures in a high-resolution chroma sampling format (such as YUV 4:4:4) using a video encoder and decoder operating on coded pictures in a low-resolution chroma sampling format (such as YUV 4:2:0) are presented. For example, high chroma resolution details are selectively encoded on a region-by-region basis. Or, as another example, coded pictures that contain sample values for low chroma resolution versions of input pictures and coded pictures that contain sample values for high chroma resolution details of the input pictures are encoded as separate sub-sequences of a single sequence of coded pictures, which can facilitate effective motion compensation. In this way, available encoders and decoders operating on coded pictures in the low-resolution chroma sampling format can be effectively used to provide high chroma resolution details.

Encoding/decoding of high chroma resolution details

Embodiments are directed to controlling bandwidth usage using a token-based crediting and debiting scheme and to allowing connections to temporarily exceed bandwidth allocations using token credits. In one scenario, a bandwidth managing service receives a request to establish a connection with a network. The connection is associated with various subscribers that are part of a subscription. The bandwidth managing service assigns tokens to the connection, which are distributed from a pool of tokens that represents a total available bandwidth for the network. The bandwidth managing service receives a data transfer request from a logical user to transfer data over the network connection, where the data transfer request includes at least some of the assigned tokens. The bandwidth managing service also allocates to the connection a specified amount of bandwidth commensurate with the number of assigned tokens provided in the data transfer request.

Controlling bandwidth across multiple users for interactive services

Techniques are disclosed for virtualizing internet protocol (IP) addresses in terminal server sessions. A client component comprises a layer service provider (LSP) and a name service provider (NSP) that intercept a socket call to associate a port with a socket for a terminal server session. The client component queries a server component for a virtual IP address, and the server component determines whether the terminal server session can use a virtual IP address. Where the session can use a virtual IP address, the server returns a virtual IP address and the client component binds the socket call to the virtual IP address. Where the session cannot use a virtual IP address, the server returns an indication of that, and the client component acts as a proxy for that socket call and any future calls for that socket.

Internet protocol (IP) address virtualization for terminal server sessions

High Fidelity remoting can be enabled by loading a hybrid remote session in a computer system. The hybrid remote session can include components loaded in a console session and components loaded in a remote session.

Hybrid remote sessions

Implementations of the present invention efficiently establish secure connections between a client and server, at least in part by authenticating the client and server early on in the connection setup phases. A client initiating a connection with a server identifies the secure communication protocols enabled at the client, and identifies these protocols in a connection request it sends to the server. The server processes the message and responds with a communication protocol it deems appropriate for the connection. The client and server then exchange appropriate authentication information, and then establish a connection session that implements the chosen communication protocol, and encrypts messages using the negotiated communication protocol. Additional implementations relate to reestablishing dropped connections behind virtual Internet Protocol addresses, without necessarily having to recommit much connection resource overhead.

Creating secure interactive connections with remote resources

A strategy is described in which multiple testing agents perform multiple respective tests in a multi-user environment. One such multi-user environment allows multiple clients to interact with remote applications that are executed on a server. According to one exemplary case, a central test management module coordinates the execution of the multiple tests by the testing agents. For instance, the test management module can prevent testing agents that make demands on a global state of the multi-user environment from interfering with other testing agents.

Strategies for performing testing in a multi-user environment

An invention is disclosed for efficiently processing and transmitting graphics data in a remote desktop environment. In embodiments of the invention, a connection is established between a remote desktop server computer and a remote desktop client computer. The remote desktop server computer may process graphics data representative of a remote user desktop. The remote desktop server computer may divide the remote desktop screen in data regions and portions. The remote desktop server computer may then encode and transmit each region to the remote desktop client computer at a certain quality that may be adjusted progressively across the screen frames. The remote desktop server computer may also stop encoding and transmitting the portions of the data region that would not be visible to a user when the region is rendered on a display. The remote desktop user experiences an image quality gradually improving with each frame containing information about the image.

Cross-frame progressive spoiling support for reduced network bandwidth usage

A method for measuring application responsiveness measures the time elapsed between receiving and processing a trailing tag message inserted into the application's message queue. The method receives a message, generates a trailing tag message associated with the message, and inserts the trailing tag message into the application's message queue. The trailing tag message includes a timestamp indicating when the trailing tag message was queued. A default message handler calculates the time elapsed between when the trailing tag message was queued and when the trailing tag message was processed. The elapsed time may then be used to calculated system responsiveness.

Performance indicator for measuring responsiveness of user interface applications to user input

Growing community of inventors

Sammamish, WA, United States of America

Costin Hagiu