Early Termination of PUSCH Transmissions via HARQ-ACK Feedback
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Solution Overview
Problem
In wireless communication systems, unnecessary repeated transmissions of uplink data occur due to the lack of efficient HARQ-ACK feedback mechanisms for the physical uplink shared channel (PUSCH), leading to increased power consumption and inefficient radio resource usage.
Innovation Solution
Implementing a method where a user equipment (UE) receives HARQ-ACK information before transmitting the PUSCH as many times as the configured repetition number, using downlink control information (DCI) or uplink grants on machine type communication (MTC) or narrowband Internet of Things (NB-IoT) systems, to determine whether to terminate the transmission based on the received feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits PUSCH repeatedly according to the configured repetition number, then the reliability of uplink data transmission is improved, but unnecessary repeated transmissions occur leading to increased power consumption and inefficient radio resource usage
Solution Approach 1:
The patent implements a feedback mechanism where the base station sends HARQ-ACK information to the UE before the UE completes all configured PUSCH repetitions. The UE monitors this feedback and terminates further repetitions upon receiving an ACK, thereby avoiding unnecessary transmissions and reducing power consumption while maintaining transmission reliability through selective continuation based on feedback status
Solution Approach 2:
The base station performs preliminary evaluation of the received PUSCH signal quality and determines the need for retransmission before the UE completes all scheduled repetitions. By sending HARQ-ACK feedback in advance, the system enables the UE to stop transmissions early when successful reception is confirmed, preventing wasteful energy expenditure on predetermined repetitions
2Reliability
If the UE transmits PUSCH repeatedly according to the configured repetition number, then the reliability of uplink data transmission is improved, but radio resource usage efficiency deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the base station sends HARQ-ACK information to the UE before the UE completes all configured PUSCH repetitions. The UE monitors this feedback and terminates further repetitions upon receiving an ACK, thereby avoiding unnecessary transmissions and reducing power consumption while maintaining transmission reliability through selective continuation based on feedback status
Solution Approach 2:
The patent introduces dynamic control over the PUSCH repetition process by enabling early termination based on real-time HARQ-ACK feedback. Instead of rigidly executing a predetermined number of repetitions, the system dynamically adjusts the transmission count according to actual channel conditions and base station reception status, thereby optimizing radio resource utilization while preserving transmission reliability
3Loss of energy
If the UE monitors HARQ-ACK information frequently to enable early termination, then unnecessary transmissions are reduced, but the device complexity and processing overhead increase
Solution Approach 1:
The patent applies partial monitoring strategy where the UE monitors HARQ-ACK feedback at specific intervals or under certain conditions rather than continuously checking after every transmission opportunity. This selective monitoring approach reduces the processing overhead and device complexity while still achieving early termination benefits when feedback is available, balancing energy savings against implementation complexity
Data Source
AI summary
Various embodiments provide methods whereby a terminal and a base station transmit and receive signals in a wireless communication system, and devices for supporting same. Comprised are the steps of: transmitting a physical uplink shared channel (PUSCH) to a base station; receiving, from the base station, hybrid automatic repeat request-acknowledgment (HARQ-ACK) information on the PUSCH before transmitting the PUSCH a number of times, the number of times being the number of repeated transmissions corresponding to the PUSCH; and determining whether or not to end the transmission of the PUSCH on the basis of the received HARQ-ACK information. Accordingly, the terminal can effectively control unnecessarily repeated transmission of uplink data, and the power consumption of the terminal can be reduced.