Early Video Transmission Notification for Latency Reduction
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Solution Overview
Problem
Advanced wireless networks face challenges in transmitting high-quality video data due to variable uplink latency, leading to buffer underflows and overflows, which degrade video quality in latency-sensitive applications like augmented reality and remote surgery.
Innovation Solution
A device generates an estimated size of encoded video data pictures and sends an early notification to the L2 layer, allowing for proactive resource allocation and reduced uplink latency by indicating the expected size of packets, thereby reducing the probability of buffer overflows and underflows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional reactive buffer status reporting is used, then the system is simpler to implement, but uplink latency increases and buffer underflows/overflows occur
Solution Approach 1:
The patent applies preliminary action by having the encoder estimate and report buffer status before actual encoding occurs. The encoder proactively reports expected buffer occupancy based on predicted encoding output, allowing the MAC layer to allocate resources in advance rather than reacting after buffering actually occurs. This eliminates the latency caused by reactive reporting while maintaining manageable system complexity through prediction-based approaches.
2Reliability
If proactive resource allocation is implemented, then buffer overflow/underflow probability decreases, but measurement precision requirements increase
Solution Approach 1:
The patent implements feedback mechanisms where the encoder provides buffer status reports to the MAC layer, and the MAC layer adjusts resource allocation based on this feedback. The system continuously monitors actual buffer occupancy and compares it with predictions, allowing for iterative refinement of estimation accuracy. This feedback loop enables reliable buffer management while accommodating measurement precision requirements through adaptive adjustment rather than requiring perfect initial measurements.
Data Source
AI summary
A device generates an estimated size of encoded versions of one or more pictures of video data prior to generating the encoded versions of the one or more pictures. A physical layer of a radio system of the device is configured to send a message to a wireless base station. The message indicates a size value based on the estimated size of the encoded versions of the one or more pictures. The physical layer of the radio system receives an uplink grant notification in response to the message. Based on the uplink grant notification, the physical layer of the radio system sends packets to the wireless base station containing the encoded versions of the one or more pictures.