RTT-Based Bitrate Control for Split-XR Network Interference

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Solution Overview

Problem

Split-XR systems experience increased latency and packet error rates due to interference channel conditions, leading to visual artifacts and degraded user experience, and existing mitigation strategies are ineffective across different network types.

Innovation Solution

Implement RTT-based adaptive rate control by a server device that computes network round-trip times (NRTTs) and adjusts bitrates based on NRTT metrics to adapt to network interference, accounting for network type.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing mitigation strategies are used to reduce latency and packet error rates, then user experience is improved, but the strategies are ineffective across different network types

Engineering Contradiction:

Improveeffectiveness of mitigation strategiesVSAvoidnetwork type adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The system dynamically adapts the bitrate based on real-time NRTT metrics and network conditions. The rate control mechanism adjusts transmission parameters dynamically rather than using fixed strategies, enabling effective adaptation across different network types including WiFi, cellular, and wired connections

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the bitrate parameter based on computed NRTT metrics. By monitoring round-trip time variations and adjusting the bitrate accordingly, the system maintains reliability across different network types without requiring network-type-specific mitigation strategies

Inventive Principle:

Principle #35Parameter changes

2Reliability

If bitrate is increased to improve video quality, then user experience is improved, but latency and packet error rates increase due to network interference

Engineering Contradiction:

Improvevideo qualityVSAvoidlatency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system implements a feedback mechanism where NRTT metrics are continuously monitored and used to adjust the bitrate. This closed-loop control ensures that bitrate increases only occur when network conditions permit, preventing latency and packet error rate increases while maintaining optimal video quality

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary computation of NRTT metrics before adjusting bitrate. By anticipating network conditions through proactive metric computation and analysis, the system can adjust bitrate in advance to avoid latency issues rather than reactively responding to degradation

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12513065B2Rate control based on round-trip time

Publication Date: 2025.12.30 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a server device may receive, during a first time window, information indicating a plurality of client round-trip times (CRTTs) associated with a client device. The server device may compute a plurality of network round-trip times (NRTTs) based at least in part on the plurality of CRTTs, each NRTT in the plurality of NRTTs corresponding to a respective CRTT in the plurality of CRTTs. The server device may compute one or more NRTT metrics for the first time window using the plurality of NRTTs. The server device may selectively adjust a bitrate used for a transmission to the client device based at least in part on a determination of whether the one or more NRTT metrics satisfy one or more NRTT metric thresholds. Numerous other aspects are described.