User Plane Function Signaling for Retransmission Priority
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Solution Overview
Problem
The transmission control protocol (TCP) causes out-of-order data packets due to retransmissions, leading to increased waiting delays and frame freezing during media playback in high-data-volume scenarios like ultra-high-definition video and virtual/augmented reality streaming.
Innovation Solution
A communication method where a user plane function network element identifies retransmitted data based on sequence number differences or receiving responses, sending indication information to prioritize its transmission through higher-quality service flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCP in-sequence delivery is used to ensure reliable transmission, then data reliability is improved, but waiting delay increases and frame freezing occurs during media playback
Solution Approach 1:
The patent segments the data transmission process into different quality of service flows: a first QoS flow for in-sequence delivery (ensuring reliability) and a second QoS flow for out-of-order delivery (reducing waiting delay). This segmentation allows the system to simultaneously achieve both reliability and reduced delay by routing different data packets through different flows.
Solution Approach 2:
The patent applies local quality by assigning different delivery characteristics to different data flows. The first QoS flow maintains strict in-sequence delivery for reliability-critical data, while the second QoS flow allows out-of-order delivery for latency-sensitive data. This localized differentiation of quality characteristics resolves the contradiction between reliability and waiting delay.
2Device complexity
If retransmitted data is transmitted through normal QoS flows, then network transmission is simple, but frame freezing occurs during media playback
Solution Approach 1:
The patent segments retransmitted data into a separate second QoS flow that allows out-of-order delivery, distinct from the first QoS flow for initial data transmission. This segmentation prevents retransmitted data from causing frame freezing during playback while maintaining manageable network transmission complexity through structured flow management.
Solution Approach 2:
The patent introduces a quality of service flow as an intermediary mechanism between the network transmission layer and the media playback layer. This intermediary structure allows retransmitted data to be handled differently from initial data, mediating between the need for reliability and the need for continuous stable playback.
3Loss of time
If out-of-order data packets are transmitted to reduce waiting delay, then waiting delay is reduced, but data reliability may be compromised
Solution Approach 1:
The patent segments data transmission into two parallel QoS flows: the first flow maintains in-sequence delivery for reliability, while the second flow enables out-of-order delivery for reduced waiting delay. This segmentation allows the system to selectively apply different reliability-delay trade-offs to different data packets based on their characteristics and playback requirements.
Solution Approach 2:
The patent implements local quality by assigning different delivery characteristics to different data flows. The first QoS flow uses strict in-sequence delivery where reliability is paramount, while the second QoS flow uses out-of-order delivery where reducing waiting delay is prioritized. This localized quality differentiation enables simultaneous optimization for both reliability and delay reduction.
Data Source
AI summary
Embodiments of this disclosure provide a communication method and apparatus, to reduce a waiting delay during transmission of retransmitted data and out-of-order data. In this method, a user plane function network element may receive first data and second data, determines, based on first information, that the second data is retransmitted data of the first data, and sends indication information to an access network network element. The indication information herein may indicate that the second data is the retransmitted data, or indicate a sending priority of the second data. Based on this solution, the access network network element may send the first data and the second data based on the indication information, and may preferentially send the retransmitted data to reduce the waiting delay during data transmission.