DCI Format for TCI State Indication in 5G NR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G NR technology faces challenges in efficiently managing downlink control information (DCI) for beam indication with or without downlink assignment, which affects transmission configuration indication (TCI) states in wireless communication systems.
Innovation Solution
The implementation of a method and apparatus that allow wireless devices to receive and generate DCI with TCI codepoints in a TCI field, enabling the application of TCI states for beam indication, either with or without downlink assignment, to optimize transmission configuration in user equipment (UE) and base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DCI is used for beam indication without downlink assignment, then beam indication flexibility is improved, but DCI format complexity increases
Solution Approach 1:
The DCI format is segmented into mandatory fields and optional fields. The TCI field is made optional and only included when the DCI is used for beam indication. This segmentation allows the DCI format to be simplified for non-beam-indication uses while maintaining flexibility for beam indication scenarios.
Solution Approach 2:
The DCI format dynamically adapts its structure based on the intended use. When the DCI is for beam indication, the TCI field is included; otherwise, it is excluded. This dynamic adjustment resolves the contradiction by making the format complex only when necessary for beam indication functionality.
2Measurement precision
If TCI field is included in all DCI formats, then beam indication accuracy is improved, but information transmission efficiency deteriorates
Solution Approach 1:
The TCI field is extracted from the mandatory DCI structure and placed in an optional position. It is only included when beam indication is required, thereby maintaining beam indication accuracy when needed while avoiding unnecessary information overhead when beam indication is not required, thus preserving transmission efficiency.
Solution Approach 2:
The TCI field is applied locally only to DCI messages that require beam indication, rather than being universally included in all DCI formats. This localized application ensures accurate beam indication where needed while minimizing information redundancy elsewhere.
3Speed
If DCI format is simplified for beam indication, then processing speed is improved, but functionality for other purposes deteriorates
Solution Approach 1:
The DCI format is designed with multi-functionality, supporting both beam indication and non-beam-indication purposes. By making the TCI field optional rather than mandatory, the same DCI format structure can serve multiple functions: simplified processing when TCI is omitted and accurate beam indication when TCI is included, thus maintaining versatility while enabling speed optimization.
Data Source
AI summary
The present disclosure provides systems, devices, apparatus and methods, including computer programs encoded on storage media, for downlink control information format for indication of transmission configuration indication state. A user equipment may receive, from a base station, downlink control information (DCI); determining whether the DCI is used for beam indication with or without downlink assignment. The UE also may apply transmission configuration indication (TCI) states based on TCI codepoints in a TCI field of the DCI, when the DCI is used for beam indication. The base station may generate the DCI with information indicating whether the DCI is intended for beam indication with or without downlink assignment, in which the DCI includes the TCI codepoints to apply the TCI states at the UE when the information in the DCI indicates that the DCI is intended for beam indication. The base station may transmit, to the UE, the DCI.