Wireless Frame Rate Control via Expiration Time Feedback
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Solution Overview
Problem
In wireless communication systems, especially in Wi-Fi Display applications, frame rate control is inadequate, leading to increased latency and degraded display quality due to collisions and losses in video bit streams, particularly in noisy or path-loss environments, where retransmissions are necessary but often ineffective.
Innovation Solution
A method and apparatus for frame rate control in wireless communications systems, where a frame generating module generates information corresponding to an expiration time, and a driver module handles the frame based on this information, informing the frame generating module to adjust the frame rate according to predetermined rules, thereby reducing latency and improving transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmissions are performed for lost video bit streams in noisy wireless channels, then data reliability is improved, but transmission latency increases and throughput decreases
Solution Approach 1:
The system performs preliminary actions by generating multiple redundant video bit streams in advance before transmission. When channel conditions deteriorate, these pre-generated alternative streams are already available for immediate switching without requiring retransmission waiting time, thus resolving the contradiction between reliability and latency
Solution Approach 2:
The system implements feedback mechanisms where the receiver monitors channel conditions and transmission status, then sends feedback signals to the transmitter. Based on this feedback, the transmitter dynamically adjusts which pre-generated bit stream to transmit or whether to perform retransmissions, optimizing the balance between reliability and latency in real-time
2Manufacturing precision
If frame generating rate is increased to improve video quality, then display quality is improved, but transmission buffer overflow increases and latency increases due to retransmissions
Solution Approach 1:
The system employs dynamic frame generating rate adjustment where the frame rate is not fixed but adapts based on real-time channel conditions and receiver buffer status. When channel conditions are good, the frame rate increases to improve quality; when conditions deteriorate or buffer fills up, the frame rate decreases to prevent overflow and reduce latency
Solution Approach 2:
The system changes transmission parameters including frame generating rate, bit stream encoding format, and redundancy level based on channel conditions and receiver status. These parameter adjustments allow the system to optimize display quality while preventing buffer overflow and controlling latency
3Reliability
If retransmissions are performed for lost slices, then data completeness is improved, but frame combination effectiveness decreases and latency increases
Solution Approach 1:
The system generates multiple alternative encodings of the same video frame in advance (e.g., different slice partitions, different compression levels). If certain slices are lost during transmission, the receiver can immediately switch to an alternative pre-generated encoding that contains the necessary data, avoiding the latency of waiting for retransmissions and maintaining frame combination effectiveness
Data Source
AI summary
A method for frame rate control in a transmitter of a wireless communications system comprises generating a frame and a first information corresponding to a first expiration time of the frame by a frame generating module; handling the frame according to the first expiration time by a driver module; and informing the frame generating module an adjusting information according to a first pre-determined rule by the driver module.