RTSP Server Predictive Response Mechanism

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Solution Overview

Problem

Conventional techniques for establishing sessions using protocols like RTSP are inefficient, leading to excessive latency in setting up media streams over networks, which can result in delayed media delivery and suboptimal user experience.

Innovation Solution

The solution involves a server predicting client requests and preemptively sending responses, reducing round trip times for request and response sequences by transmitting anticipatory acknowledgments before receiving the actual requests, thereby accelerating session establishment and media stream delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If conventional RTSP session establishment techniques are used, then protocol compliance is maintained, but session establishment time is excessive (3-4 seconds latency)

Engineering Contradiction:

Improvesession establishment timeVSAvoidprotocol compliance

Core Design Contradiction:

Loss of timeVSEase of operation

Solution Approach 1:

The server performs preliminary actions by predicting client requests and preemptively sending responses before the actual requests are received. The server anticipates the DESCRIBE, SETUP, and PLAY request sequence and sends corresponding responses in advance, eliminating round-trip delays while maintaining protocol compliance through proper response formatting and timing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system cushions against protocol latency by pre-preparing and sending responses before they are strictly needed. The server sends anticipatory responses that act as a buffer, ensuring that when actual requests arrive, the responses are already in transit or delivered, thus compensating for network round-trip time without violating protocol requirements.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Speed

If anticipatory responses are sent before receiving requests, then round trip time is reduced, but protocol sequence integrity must be maintained

Engineering Contradiction:

Improveresponse transmission speedVSAvoidprotocol sequence integrity

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The server performs preliminary response preparation and transmission based on predicted request sequences. By anticipating the standard RTSP message flow (DESCRIBE→SETUP→PLAY) and sending corresponding responses in advance, the server accelerates communication while maintaining protocol sequence integrity through proper ordering and timing of anticipatory responses.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback mechanisms to ensure protocol sequence integrity is maintained. The server monitors actual client requests against predicted sequences, adjusting anticipatory response timing and content based on real-time feedback. This ensures that while responses are sent in advance, they remain synchronized with actual protocol exchanges and do not violate sequence requirements.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8990407B2Fast setup response prediction

Publication Date: 2015.03.24 ADEIA MEDIA HOLDINGS INC

AI summary

Mechanisms are provided to accelerate Real-Time Streaming Protocol (RTSP) setup messages. A client transmits an RTSP request to a server. The server responds to the request and preemptively responds with acknowledgements for messages not yet received. For example, a server responds to an RTSP describe message with an RTSP describe acknowledgement, an RTSP setup acknowledgement, and an RTSP play response before setup and play messages are received by the server or even transmitted by the client. The client processes the anticipatory responses and transmits setup and play responses when the anticipatory responses are processed.