In-Vehicle Video Frame Scheduling via Priority-Based Resource Allocation
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Solution Overview
Problem
In vehicle communication systems, the transmission of compressed video frames over wireless networks faces challenges with resource allocation inefficiencies and interference, leading to increased latency and reduced spectral efficiency due to the complex interplay of multiple video sources and external environmental factors.
Innovation Solution
A method and apparatus for scheduling resource allocations for video streams based on the type of compressed frames (I-frames, P-frames, and B-frames) prioritize frames with higher priority and adjust transmission slots to minimize interference, ensuring efficient use of time-frequency resources by determining the relative priority of frames based on vehicle position, operation, external environment, and video source characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource allocations are scheduled for multiple video frames concurrently due for transmission, then the transmission capacity is improved, but the time-frequency resource consumption increases beyond threshold
Solution Approach 1:
The patent changes the parameter of resource allocation by introducing frame priority based on compressed frame type (I-frame, P-frame, B-frame). High priority frames (I-frames) are transmitted first, followed by medium priority (P-frames), and low priority (B-frames). This parameter change in transmission ordering allows the system to maintain high transmission capacity for critical frames while controlling overall resource consumption by selectively deferring or dropping lower priority frames when resources are constrained.
2Adaptability or versatility
If multiple video streams are transmitted simultaneously over wireless network, then the video coverage is improved, but the interference increases and spectral efficiency decreases
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different frame types within the video stream. I-frames receive high priority with guaranteed resource allocation, P-frames receive medium priority, and B-frames receive low priority. This localized differentiation in quality of service for different frame types allows multiple video streams to be transmitted simultaneously with improved spectral efficiency, as critical frames are protected from interference while less critical frames can be deferred or dropped.
3Loss of time
If resource allocations are scheduled based on frame priority, then the latency is reduced for critical frames, but the device complexity increases
Solution Approach 1:
The patent segments the video frame transmission into three distinct priority levels: high priority (I-frames), medium priority (P-frames), and low priority (B-frames). This segmentation simplifies the scheduling complexity by providing clear, rule-based transmission ordering rather than requiring complex real-time optimization algorithms. The segmented approach reduces latency for critical I-frames by guaranteeing their transmission first, while the simplified priority rules keep device complexity manageable.
Data Source
AI summary
A video stream scheduling unit may schedule resource allocations for each video frame of a plurality of video frames of video streams from a plurality of video sources based on a compressed frame type of the video frame, determine that a total frequency bandwidth of scheduled resource allocations for the frames concurrently due for transmission is greater than or equal to a threshold bandwidth, and receive the video streams from the plurality of video sources based on the scheduled resource allocations. The scheduling unit may delay or cancel a video frame with low priority or may instruct a video source to increase the compression rate of the video stream.