Citrix Systems, Inc.

Henry Collins

Allen Samuels

Richard Jensen

Justin Bullard

Ruiguo Yang

Paul Coleman

The present solution automatically detects the remote display protocol capabilities of the client, server and/or intermediaries to determine whether the client and server should compress the remote display protocol data or the intermediaries, and in some cases both.

Systems and methods for intermediaries to compress data communicated via a remote display protocol

The present solution is directed towards systems and methods to more efficiently control a flow of a data stream traversing at least one intermediary on a network between a client and a server. A sender transmits a first message, comprising a first value of a bandwidth between the first intermediary and a second intermediary determined by the sender, to a first intermediary. The first intermediary establishes a next value of the bandwidth between the first intermediary and the second intermediary. The sender receives from the first intermediary responsive to the first message a second message comprising the established next value of the bandwidth between the first intermediary and the second intermediary. A data transfer manager of the sender, responsive to the second message determines a size of a portion of data queued for transmission to transmit to the first intermediary and a time for transmitting the portion of data queued.

Systems and methods for real-time endpoint application flow control with network structure component

The present disclosure is directed towards systems and methods for allocating a bandwidth credit or an annuity of bandwidth credit to a sender by an intermediary deployed between the sender and a receiver. The sender may be allocated a bandwidth credit or an annuity of bandwidth credit which may identify an amount of data the sender may transmit over a predetermined time period to the receiver, via the intermediary. The intermediary may determine an allocation of a one-time bandwidth credit based on the determination that a difference between the rate of transmission of the sender and the bandwidth usage of the sender falls below a predetermined threshold of the bandwidth credit. The intermediary may determine an annuity of bandwidth credit based on a determination that a difference between the bandwidth usage of the sender over the annuity period and the annuity of bandwidth credit exceeds a predetermined threshold.

Systems and methods for allocating bandwidth by an intermediary for flow control

An encoder executing on a first computing machine can receive image data generated by applications executing on the first computing machine. This encoder can divide at least a first image into at least two overlapping image sections according to a grid size and an overlap margin. The encoder computes an index for one overlapping image section, and compares the index with indexes associated with stored image blocks. The results of the comparison can then be used by the encoder to identify at least one stored image that has an index which is substantially the same as the index computed for the at least one overlapping image section. The location of that stored image is associated with a pointer that is further associated with the overlapping image section. The resultant pointer is then transferred to a second computing machine in lieu of the overlapping image section.

Systems and methods for enhanced image encoding

The present invention improves the performance of distributed systems by reducing the amount of graphical data transmitted between an application server and a thin client. The encoding technique used for graphical data is adapted in response to the repetitiveness of the graphical data during a particular client-server session. Indexes are maintained that are indicative of this repetitiveness and which identify a particular location in the client's cache memory storing the graphical data. Where the index is not found, but a fuzzy key indicates a strong likelihood that the graphical object is located at the client, the client's persistent storage memory is searched for a file name corresponding to the fuzzy key and which stores the graphical object therein.

Method and system for efficiently reducing graphical display data for transmission over a low bandwidth transport protocol mechanism

The performance of distributed systems can be improved when a server remotely controls off-screen surfaces at a client coupled to the server via a communications network. The server instructs the client to form an off-screen surface exhibiting a number of particular attributes. The client selects and allocates a particular memory region and forms the off-screen surface therein, as instructed by the server. The server subsequently provides the client with an indicia of graphical data and instructs the client to locate the graphical data and to copy the data into the off-screen surface. In response to an error condition, the server transmits a duplicate of the off-screen surface to the client with instructions to update the client's on-screen surface using this duplicate surface.

Remote control of a client's off-screen surface

The performance of distributed systems can be improved by reducing the amount of graphical line data transmitted between a server and a client. The server separates the graphical line data into a plurality of strips. The server then determines a quantized angle and a strip length for each of the strips. The beginning coordinate of the graphical line data is packaged together with the quantized angle or indicia of the quantized angle and the strip length data into a protocol packet and compressed prior to transmission to the client. In one embodiment the strip data transmitted to the client includes a second indicia that a particular strip has been previously transmitted to the client and the client is instructed to form the strip using locally stored data.

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High Wycombe, United Kingdom

Henry Collins