Uplink Scheduling in NR for Low-Delay Retransmission
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Solution Overview
Problem
The challenge of maintaining coverage quality and service quality in New Radio (NR) systems operating at higher frequencies is exacerbated by higher path loss, where the control channel is a bottleneck due to the need for repeated transmissions in the time domain, leading to increased transmission delay and inefficient channel utilization.
Innovation Solution
Implementing a data transmission scheduling method that allows for multiple scheduling instructions within a time domain unit, enabling simultaneous scheduling of new and retransmission data, thereby reducing waiting periods and improving channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated transmission in the time domain is used to obtain combined gain, then coverage quality is improved, but transmission delay increases
Solution Approach 1:
The base station sends scheduling instructions in advance to the UE, enabling the UE to prepare and transmit data earlier than waiting for ACK/NACK feedback. This preliminary scheduling action reduces the waiting time and overall transmission delay while maintaining the repeated transmission strategy for coverage enhancement.
2Reliability
If repeated transmission in the time domain is used, then coverage quality is improved, but channel utilization becomes inefficient
Solution Approach 1:
The base station continuously sends scheduling instructions to the UE without idle waiting periods. By eliminating the stop-and-wait mechanism and maintaining continuous scheduling actions, the system improves channel utilization while preserving the repeated transmission approach for maintaining coverage quality.
3Measurement precision
If the base station waits for ACK/NACK feedback before scheduling retransmission, then transmission accuracy is maintained, but scheduling efficiency decreases
Solution Approach 1:
The base station performs preliminary scheduling by sending instructions in advance based on predicted transmission needs, rather than waiting for actual ACK/NACK feedback. This preliminary action maintains transmission accuracy through proper scheduling while significantly improving scheduling efficiency by eliminating idle waiting time.
Data Source
AI summary
Embodiments of the present application provide a data transmission scheduling method and apparatus, a communication device, and a storage medium. The method can include transmitting a first scheduling instruction to a User Equipment (UE) in a N-th time domain unit, where the first scheduling instruction schedules the UE to transmit uplink data in a (N+K)-th time domain unit, and the N and the K are both natural numbers, and transmitting, between the N-th time domain unit and the (N+K)-th time domain unit, at least one second scheduling instruction to the UE, where the second scheduling instruction schedules the UE to transmit uplink data.