Adaptive Video Bit Rate Encoding for Wireless Display Channel Capacity

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Solution Overview

Problem

Wireless Display (WiDi) technologies face challenges in maintaining video quality due to varying wireless channel conditions, leading to packet loss and retransmissions, as they typically use fixed rate video encoding independent of channel capacity.

Innovation Solution

Implementing an adaptive video bit rate algorithm that determines and adjusts the video encoding rate based on current and previous wireless channel capacity values, allowing gradual increases and rapid decreases to ensure error-free transmission, thereby optimizing video quality according to available channel capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If fixed rate video encoding is used, then device complexity is reduced and ease of operation is improved, but video quality deteriorates when wireless channel conditions degrade

Engineering Contradiction:

Improveease of operationVSAvoidvideo quality

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The video encoding system dynamically adjusts the encoding rate based on real-time wireless channel capacity measurements. The encoder transitions from a static fixed-rate mode to a dynamic adaptive mode where the bit rate is continuously modified according to channel conditions, resolving the contradiction between operational simplicity and video quality reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements a feedback mechanism where the encoder receives information about wireless channel capacity and adjusts the encoding rate accordingly. This closed-loop control ensures that video quality is maintained by adapting the encoding rate to match current channel conditions, preventing packet loss and retransmissions.

Inventive Principle:

Principle #23Feedback

2Reliability

If adaptive video bit rate encoding is implemented, then video quality is improved by matching channel capacity, but device complexity increases

Engineering Contradiction:

Improvevideo qualityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The video encoding system performs self-adjustment by automatically measuring wireless channel capacity and modifying its own encoding rate without external intervention. The encoder monitors channel conditions and autonomously adapts the bit rate, reducing the need for complex external control mechanisms while maintaining video quality.

Inventive Principle:

Principle #25Self-service

3Reliability

If video encoding rate is increased to maintain high quality, then video quality is improved, but packet loss increases when channel capacity is insufficient

Engineering Contradiction:

Improvevideo qualityVSAvoidpacket loss

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The system changes the encoding rate parameter based on wireless channel capacity measurements. By dynamically adjusting this critical parameter, the system ensures that the video bit rate matches the channel's transport capacity, preventing packet loss while maintaining the highest possible video quality for current conditions.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9113141B2Wireless channel aware adaptive video bit rate encoding

Publication Date: 2015.08.18 INTEL CORP

AI summary

A determination and query is performed on wireless channel on which video data is transmitted from a transmitting wireless display or WiDi device. Based on a channel capacity and implementing an algorithm, the encoding bit rate at the transmitting WiDi device. is adaptively adjusted based on the determined channel capacity.