Dynamic ACK/NACK Feedback Timing for 5G NR Latency Reduction
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Solution Overview
Problem
Existing ACK/NACK information feedback schemes in 4G LTE systems are not compatible with the flexible scheduling requirements of 5G NR, leading to increased data transmission delays due to fixed subframe delays and limited frequency band compatibility.
Innovation Solution
A method for dynamically adjusting the subframe for ACK/NACK information feedback based on the user equipment's processing capability and delay capability, indicated through control signaling, to reduce communication latency and improve transmission efficiency, allowing for flexible scheduling and service priority adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed subframe delay is used for ACK/NACK feedback in 4G LTE, then system compatibility is maintained, but data transmission delay increases
Solution Approach 1:
The patent applies dynamics by making the ACK/NACK feedback timing flexible rather than fixed. The base station dynamically determines the subframe for ACK/NACK feedback based on user equipment processing capability and service requirements, allowing the system to adapt timing to specific conditions rather than using a rigid fixed delay scheme.
Solution Approach 2:
The patent changes the time delay parameter from a fixed value to a variable that can be adjusted based on user equipment capability and service requirements. The base station configures different subframe delays dynamically, transforming the static parameter into a flexible one that optimizes both compatibility and transmission speed.
2Loss of time
If dynamic subframe adjustment is implemented for ACK/NACK feedback, then data transmission delay is reduced, but system complexity increases
Solution Approach 1:
The patent uses feedback mechanisms where user equipment reports its processing capability to the base station. This feedback allows the base station to make informed decisions about appropriate feedback timing, reducing the need for complex trial-and-error scheduling while still achieving optimized delay performance.
Solution Approach 2:
The patent applies preliminary action by having user equipment pre-report its processing capability before data transmission begins. This advance information allows the base station to pre-determine appropriate feedback timing, avoiding the need for complex real-time calculations and reducing scheduling complexity.
3Ease of operation
If fixed delay scheme is used, then scheduling simplicity is maintained, but transmission efficiency decreases
Solution Approach 1:
The patent transforms the static scheduling approach into a dynamic one where feedback timing adapts to user equipment capability and service requirements. This dynamic adjustment improves transmission efficiency by reducing unnecessary delays while maintaining operational simplicity through base station-controlled configuration.
Solution Approach 2:
The patent changes the time delay parameter from fixed to variable, allowing optimization of transmission efficiency. The base station configures appropriate subframe delays based on user equipment processing capability, improving productivity without requiring complex user-side scheduling decisions.
4Reliability
If backward compatibility with 4G LTE is prioritized, then system interoperability is ensured, but 5G performance flexibility is degraded
Solution Approach 1:
The patent applies universality by designing a feedback timing mechanism that can serve multiple purposes: maintaining compatibility with existing systems while enabling flexible optimization for 5G performance requirements. The base station-controlled approach provides a unified solution that works across different deployment scenarios.
Solution Approach 2:
The patent uses dynamics to create a system that can adapt its behavior based on requirements. The same feedback mechanism can operate in a more fixed manner for compatibility scenarios or in a highly flexible manner for performance-optimized scenarios, providing both backward compatibility and forward flexibility.
Data Source
AI summary
Example methods and apparatus for transmitting ACK/NACK information for data are disclosed. One method includes sending a data packet from a base station to a user equipment. A control signaling is transmitted from the base station to the user equipment and is used to indicate a subframe to be used by the user equipment to send ACK/NACK information corresponding to the data packet.