Loss-Tolerant Protocol for Remote Desktop Graphics
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Solution Overview
Problem
Remote desktop protocols like RDP experience high latency over wide area networks due to stream-oriented protocols like TCP, leading to delayed delivery of desktop graphics data, which negatively impacts user experience.
Innovation Solution
Implementing a loss-tolerant graphics exchange protocol using UDP for transmitting desktop graphics data, where each frame is self-contained and can be retransmitted over a separate UDP link, allowing the client to detect lost packets and request refreshes through a lossless TCP channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCP protocol is used for transmitting desktop graphics data, then data delivery reliability is improved, but transmission latency increases
Solution Approach 1:
The patent segments the data transmission into two independent channels: a reliable TCP channel for control and acknowledgment messages, and an unreliable UDP channel for actual graphics data transmission. This segmentation allows each protocol to be optimized for its specific function, reducing overall latency while maintaining reliability where needed
Solution Approach 2:
The patent introduces an intermediary mechanism where the client detects lost UDP packets and requests retransmission through the TCP channel. This intermediary approach allows the system to use fast UDP transmission while compensating for packet loss through a controlled retransmission process, rather than relying solely on TCP's built-in retransmission which adds latency
2Loss of time
If UDP protocol is used for transmitting desktop graphics data, then transmission latency is reduced, but packet delivery reliability deteriorates
Solution Approach 1:
The patent implements dynamic adaptation by allowing the system to switch between UDP's fast transmission mode and TCP's reliable retransmission mode based on network conditions and packet loss detection. The client dynamically requests retransmissions only when necessary, optimizing the balance between speed and reliability in real-time
Solution Approach 2:
The patent changes the delivery guarantee parameter from binary (guaranteed or not) to a selective approach where critical control messages use guaranteed delivery via TCP while graphics data uses best-effort delivery via UDP. This parameter change allows the system to optimize for speed where possible while maintaining reliability where necessary
Data Source
AI summary
In various embodiments, remote presentation encoding techniques may be modified in such a way that the data can be transmitted over transports without guaranteed packet delivery. In one embodiment, the desktop graphics data may be encoded in individual frames, each frame comprising self-contained graphics elements that fit in a small number of User Datagram Protocol (UDP) protocol data units (PDUs). The PDUs may then be sent to the client on a separate lossy link instead of the lossless link. On the client side, the client may detect which graphic elements within a frame were “lost” as a result of dropped UDP packets and request a refresh from the server through the lossless channel.