PDCCH HARQ Feedback for Early PUSCH Repetition Stop in NTN
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Solution Overview
Problem
In non-terrestrial networks, the large transmission delay and monitoring gap of the physical downlink control channel (PDCCH) based hybrid automatic repeat request acknowledgment (HARQ ACK) function fail to prematurely end the transmission of the physical uplink shared channel (PUSCH), leading to increased power consumption and resource wastage in enhanced machine type communication (eMTC) user equipment.
Innovation Solution
Implementing a feedback information transmission method that includes setting parameters for the PDCCH search space, sending scheduled resource grants, and providing PUSCH feedback indications to the user equipment (UE) through the PDCCH search space to stop the remaining repetition number of PUSCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PDCCH-based HARQ ACK function is used in non-terrestrial networks, then power consumption of UE can be reduced, but the large transmission delay and monitoring gap cause the PDCCH to arrive behind the PUSCH completion time, making the function fail to prematurely end transmission
Solution Approach 1:
The base station sends the PDCCH HARQ ACK indication in advance, before the UE completes its PUSCH transmission, based on early detection of the PUSCH. This preliminary action allows the UE to stop transmission early without waiting for the full round-trip delay, resolving the contradiction between reducing power consumption and overcoming transmission delay in non-terrestrial networks.
Solution Approach 2:
The base station implements a feedback mechanism by sending PDCCH HARQ ACK indications to the UE to confirm successful reception of PUSCH. This feedback loop enables the UE to adjust its transmission behavior (stop early or continue) based on the base station's reception status, optimizing power consumption while accounting for non-terrestrial network delays.
2Reliability
If the base station waits for complete PUSCH transmission before sending PDCCH HARQ ACK, then transmission accuracy is ensured, but wireless resources are wasted and UE power consumption increases
Solution Approach 1:
The base station performs preliminary detection of the PUSCH and sends the PDCCH HARQ ACK indication before the UE completes its full transmission. This allows early termination of redundant transmissions while maintaining reliability through the base station's advance detection capability, thereby reducing UE power consumption without sacrificing transmission accuracy.
Solution Approach 2:
The system dynamically adjusts the PDCCH monitoring behavior of the UE based on the received HARQ ACK indication. When an early ACK is received, the UE dynamically stops monitoring and transmitting, adapting its behavior to save power while the base station maintains transmission accuracy through its detection and feedback mechanisms.
Data Source
AI summary
Provided are a feedback information transmission method and apparatus, a base station, a user equipment and a storage medium. The method includes sending a setting parameter of a physical downlink control channel (PDCCH) search space; sending a scheduled dedicated uplink resource grant or a scheduled dedicated downlink resource grant through the PDCCH search space; and in response to receiving a physical uplink shared channel (PUSCH) of a user equipment (UE), sending a PUSCH feedback indication to the UE through the PDCCH search space so that the UE stops sending the remaining repetition number of the PUSCH.