RAN Level NAK Feedback for Wireless Media Latency
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Solution Overview
Problem
Current wireless communication systems face latency issues in providing feedback for unsuccessful media frame transmissions, leading to playback freezes and unnecessary retransmissions due to the delay in end-to-end RTP feedback, which can take up to 400 ms or more.
Innovation Solution
Implementing a RAN level negative acknowledgment (NAK) feedback mechanism that allows the encoding device to quickly identify and correct missing frames, reducing latency and minimizing retransmissions by enabling timely corrective actions based on NAK feedback from the network entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If end-to-end RTP feedback is used for transmission errors, then decoding accuracy is improved, but feedback latency increases significantly (up to 400 ms or more)
Solution Approach 1:
The network entity acts as an intermediary that provides intermediate feedback about transmission errors. Instead of waiting for end-to-end RTP feedback from the decoding device, the network entity monitors transmission status and sends early error notifications to the encoding device, enabling timely retransmission decisions while maintaining decoding accuracy.
Solution Approach 2:
The system performs preliminary error detection and notification at the network entity level before the decoding device actually experiences playback issues. By detecting transmission errors early and notifying the encoder in advance, the system allows corrective retransmissions to occur before the 400 ms latency threshold causes playback freezes.
2Reliability
If retransmissions are performed based on end-to-end feedback, then transmission reliability is improved, but unnecessary retransmissions occur due to delayed feedback
Solution Approach 1:
The system implements a two-level feedback mechanism: (1) Network entity provides intermediate feedback about transmission status to the encoding device, and (2) Decoding device provides end-to-end RTP feedback. This layered feedback approach enables the encoder to make informed retransmission decisions based on network-level information, reducing unnecessary retransmissions while maintaining transmission reliability.
3Loss of time
If early NAK feedback is implemented at RAN level, then feedback latency is reduced, but system complexity increases
Solution Approach 1:
The network entity leverages its existing multi-functional role in the communication system to provide early NAK feedback. As an existing component that already handles signal routing and transmission monitoring, the network entity adds the feedback notification function without requiring entirely new hardware, thereby reducing the impact of increased system complexity.
Data Source
AI summary
Aspects of the present disclosure provide techniques for using a radio access network (RAN) level negative acknowledgement (NAK) feedback to indicate at least one missing frame from an encoding device. The RAN level NAK feedback replaces or preempts a decoding device sending an end-to-end feedback to the encoding device using real-time transport protocol (RTP) that has a long latency and may cause freezes at the decoding device. For example, an encoding device may send to a network entity a request for a configuration that configures the encoding device to transmit media frames to the decoding device. The network entity may provide a NAK feedback indicating at least one missing frame. Having received the configuration in response to the request, the encoding device transmits media frames to the decoding device via the network entity, and monitors for NAK feedback from the network entity in accordance with the configuration.