DisplayPort Tunneling Bandwidth Allocation for USB4 Multi-Stream Links

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Solution Overview

Problem

Existing technologies face challenges in optimizing bandwidth allocation for DisplayPort tunneling over USB4, leading to potential over-allocation and inefficiencies in resource utilization, especially when multiple streams share resources.

Innovation Solution

Implementing a bandwidth management system that allows the DisplayPort transmitter (DPTX) to dynamically request and allocate bandwidth through a connection manager and USB4 driver, using registers to ensure efficient bandwidth distribution based on actual needs, thereby optimizing resource utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If bandwidth is allocated for DisplayPort tunneling over USB4, then video and audio streams can be transmitted, but bandwidth may be over-allocated leading to inefficient resource utilization

Engineering Contradiction:

Improvebandwidth utilization efficiencyVSAvoidresource waste

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent implements dynamic bandwidth allocation where the connection manager continuously monitors actual bandwidth usage by DisplayPort streams and adjusts allocations accordingly. The system transitions from static pre-allocated bandwidth to dynamic real-time adjustment, allowing bandwidth to be reclaimed from underutilized streams and reallocated to streams with higher demand, thereby preventing resource waste while maintaining transmission capability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces a feedback mechanism where the connection manager receives usage information from DisplayPort streams and uses this feedback to make informed bandwidth allocation decisions. The system monitors actual throughput, packet loss, and queue depth metrics, then adjusts bandwidth allocations based on this feedback, ensuring optimal resource utilization across multiple streams.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If multiple DisplayPort streams share USB4 resources, then device complexity increases, but bandwidth management becomes more challenging

Engineering Contradiction:

Improvemulti-stream supportVSAvoidbandwidth management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the bandwidth management function by creating separate bandwidth allocation entries for each DisplayPort stream. Each stream has its own allocation record that tracks usage independently, allowing the connection manager to manage multiple streams through systematic organization rather than monolithic control. This segmentation reduces management complexity by breaking down the overall problem into manageable units.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection manager implements a universal bandwidth management framework that handles multiple DisplayPort stream types (video, audio, auxiliary channels) through a single unified mechanism. The same allocation and monitoring logic applies across different stream types, reducing complexity compared to implementing separate management systems for each stream type while maintaining versatile multi-stream support.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If static bandwidth allocation is used for DisplayPort tunneling, then setup is simple, but adaptive reallocation is not possible

Engineering Contradiction:

Improvebandwidth allocation simplicityVSAvoidbandwidth adaptability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent transitions from static to dynamic bandwidth allocation while maintaining ease of operation through automated management. The connection manager automatically monitors usage and adjusts allocations without requiring manual intervention, preserving the simplicity of operation while enabling adaptability. The system self-adjusts based on real-time conditions, eliminating the need for complex manual reconfiguration.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12524358B2Bandwidth management allocation for displayport tunneling

Publication Date: 2026.01.13 INTEL CORP

AI summary

A system can include a host router comprising connection manager logic, a display port adapter, and a display port adapter register to comprise display port adapter register values. A display port source device comprises a display port transmitter connected to the display port adapter. A display port configuration data (DPCD) register comprises display port configuration register values for the display port, the display port transmitter to write to the DPCD register. The display port adapter is to map DPCD register values to the display port adapter register. The connection manager logic is to receive a notification message requesting bandwidth allocation for the display port transmitter, determine an allocated bandwidth for the display port transmitter, and write the allocated bandwidth into the display port adapter register.