Uplink HARQ Process ID Mapping for Low-Latency NR Transmission
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Solution Overview
Problem
The current NR system faces challenges in uplink transmission, including incorrect determination of HARQ process IDs by the base station, inability to support repeated transmissions across transmission periods, and difficulty in monitoring ACKs during BWP switching, which hinders low-latency and reliable communication.
Innovation Solution
A method for uplink data transmission that involves determining the transmission occasion and HARQ process ID, mapping data according to antenna port information, and supporting repetition of mini-slots across slot boundaries, along with monitoring ACKs during BWP switching, to ensure accurate HARQ process ID determination and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If repeated PUSCH transmissions are allowed to cross transmission period boundaries, then low-latency communication is improved, but HARQ process ID determination accuracy deteriorates
Solution Approach 1:
The patent segments the transmission period into multiple independent transmission occasions, each with its own HARQ process ID. This allows repeated PUSCH transmissions to span across transmission period boundaries while maintaining clear identification of each transmission occasion through distinct HARQ process IDs, thereby resolving the contradiction between low latency and accurate HARQ process ID determination.
Solution Approach 2:
The patent pre-configures multiple HARQ process IDs and their corresponding transmission occasions before transmission begins. The base station and user equipment both have pre-established mappings between HARQ process IDs and transmission occasions, enabling accurate determination of HARQ process IDs even when transmissions cross period boundaries, thus maintaining both low latency and high accuracy.
2Adaptability or versatility
If multiple HARQ process IDs are supported with cross-boundary repetitions, then transmission flexibility is improved, but base station detection reliability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the base station sends ACK/NACK indications for each transmission occasion based on detected PUSCH signals. The user equipment uses these feedback signals to determine whether to perform retransmissions and which HARQ process IDs to use, creating a reliable closed-loop control system that maintains high detection reliability while supporting flexible cross-boundary repetitions.
Solution Approach 2:
The patent introduces the HARQ process ID as an intermediary that links transmission occasions across different periods. This intermediary enables the base station to reliably distinguish between different transmissions even when they occur across period boundaries, maintaining detection reliability while allowing transmission flexibility.
3Productivity
If antenna ports are dynamically determined based on HARQ process IDs, then resource allocation efficiency is improved, but system complexity increases
Solution Approach 1:
The patent changes the parameter mapping relationship between HARQ process IDs and antenna ports dynamically. Instead of fixed mapping, the system allows the antenna port assignment to vary based on the HARQ process ID being used, enabling more efficient resource allocation while managing complexity through standardized mapping rules that both base station and user equipment can follow.
Data Source
AI summary
The present disclosure provides an uplink transmission method, and a corresponding user equipment, base station and computer readable medium. A method for an uplink data transmission includes: determining a transmission occasion for an uplink transmission and a Hybrid Automatic Repeat Request, HARQ, process ID corresponding to the transmission occasion; determining an antenna port according to a correspondence between antenna ports and HARQ process IDs and/or a correspondence between antenna ports and transmission occasions; and transmitting, by the antenna port, uplink data corresponding to the HARQ process ID and a pilot signal corresponding to the uplink data. By establishing the correspondence between the antenna ports and the HARQ process IDs or the transmission occasion, the base station determines the antenna port when detecting the uplink transmission, so that the HARQ process ID corresponding to the uplink transmission may be determined.