Configured Grant Repetition Position Determination in NR-U
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Solution Overview
Problem
In the context of New Radio (NR) in Unlicensed (NR-U), ensuring accurate data parsing by network devices for Configured Grant (CG) resources configured with repetition is challenging due to multiple possible resource merging positions, leading to reduced merging gain and potential incorrect decoding.
Innovation Solution
The proposed solution involves a data transmission method where a terminal device determines a target position based on repetition positions of a CG resource configured with repetition, and either predetermines, indicates, or determines this position independently. The network device then merges data accordingly, ensuring accurate transmission and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple resource merging positions are configured for CG resource with repetition, then transmission reliability is improved through multiple transmission opportunities, but network device data parsing accuracy deteriorates due to uncertainty about which position actually carries data
Solution Approach 1:
The terminal device feeds back the actual transmission position information to the network device through uplink control information. This feedback mechanism enables the network device to accurately identify which repetition position actually carries data, resolving the parsing accuracy issue while maintaining multiple transmission opportunities for reliability.
Solution Approach 2:
The terminal device and network device predetermine the target position for data transmission through pre-configuration or indication before actual data transmission occurs. This preliminary determination of the target position eliminates ambiguity during the parsing process while preserving the benefits of multiple configured repetition positions.
2Reliability
If the network device merges data from all configured repetition positions, then data reception completeness is improved, but merging gain is reduced due to inclusion of empty or interference positions
Solution Approach 1:
Through feedback of the actual transmission position from the terminal device to the network device, the network device can selectively merge only the relevant repetition positions that contain actual data. This eliminates the waste of merging empty or interference positions while ensuring complete data reception.
Solution Approach 2:
The network device applies different merging strategies to different repetition positions based on their actual content quality. Instead of uniformly merging all positions, it identifies and merges only those positions with valid data, optimizing the merging gain by excluding positions containing only interference or empty signals.
3Adaptability or versatility
If the terminal device determines the target position independently, then transmission flexibility is improved, but system coordination complexity increases due to the need for position reporting
Solution Approach 1:
The terminal device independently determines the target position and reports it to the network device through feedback. This maintains transmission flexibility while managing coordination complexity through structured feedback mechanisms that provide the network device with necessary information for accurate data parsing.
Solution Approach 2:
The terminal device autonomously determines its own transmission target position based on pre-configured parameters and current transmission conditions, then communicates this self-determined position to the network device. This self-service approach maximizes transmission flexibility while keeping the coordination mechanism relatively simple through position reporting.
Data Source
AI summary
A data transmission method, including: a terminal device determining a target location according to a repetition transmission location of a configured-grant resource having a repetition transmission configuration; and the terminal device starting to transmit data on the basis of the target location, wherein the target location is determined in one of the following manners: the target location is agreed upon by the terminal device and a network device in advance, or the target location is indicated by the network device, or the target location is decided by the terminal device, where if the target location is decided by the terminal device, the terminal device reports the target location to the network device. Further disclosed are a terminal device, a network device, and a storage medium.