DMRS Table Selection for Physical Shared Channel Repetition Indication
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Solution Overview
Problem
Current Multi-TRP communication schemes in New Radio access (NR) face challenges in dynamically indicating the repetition number for physical shared channels with reduced overhead, as existing methods require increased control information (CI) to switch between different repetition numbers, affecting performance across varying service requirements and propagation environments.
Innovation Solution
The solution involves using predefined Demodulation Reference Signal (DMRS) tables to indicate whether repetitions are enabled or disabled, with a single Downlink Control Information (DCI) field dynamically switching between configurations for non-repetition and repetition scenarios, allowing for the indication of the repetition number without increasing overhead by utilizing additional fields or implicit indications within the DMRS configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic indication of repetition number is implemented using existing methods, then adaptability to different service requirements is improved, but control information overhead increases
Solution Approach 1:
The patent merges the repetition number indication with the existing DMRS configuration indication by using the same DCI field. The field that originally indicated DMRS configuration now serves dual purposes: it indicates both the DMRS configuration and the repetition number through predefined table mappings. This combining approach eliminates the need for separate indication fields, thereby reducing control information overhead while maintaining the ability to dynamically adapt to different service requirements.
Solution Approach 2:
The patent applies multi-functionality by enabling a single DCI field to perform multiple functions: it simultaneously indicates DMRS configuration and repetition number. By establishing a correspondence relationship between DMRS configuration values and repetition numbers, the same field becomes universal for both purposes, eliminating the need for additional dedicated fields and reducing overall control information overhead.
2Measurement precision
If additional fields are added to indicate repetition number, then indication precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the indication function by creating separate predefined tables for different indication scenarios. One table maps DMRS configuration values to repetition numbers, while another table handles non-repetition cases. This segmentation allows the system to maintain precise indication through table-based mappings while avoiding the need for complex additional fields in the DCI structure, as the tables are pre-configured and simply referenced.
3Quantity of substance
If implicit indication through DMRS configuration is used, then control information overhead is reduced, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent implements feedback mechanisms where the terminal device receives the DCI with the multiplexed indication, extracts both DMRS configuration and repetition number information according to predefined tables, and uses this information for accurate channel estimation and data reception. The network device also uses this feedback to properly configure subsequent transmissions, ensuring that the implicit indication system remains reliable and easy to detect through standardized processing procedures.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for indication of a repetition number for a physical shared channel. A method comprises receiving, from a network device, DCI for scheduling communications over a physical shared channel; in response to receiving an indication of whether repetitions of the physical shared channel are enabled or disabled, selecting a DMRS table from a plurality of predefined DMRS tables; in response to the repetitions of the physical shared channel being disabled, determining, based on the DCI and the DMRS table, a first configuration for DMRS communication over the physical shared channel; and in response to the repetitions of the physical shared channel being enabled, determining, based on the DCI and the DMRS table, the number of the repetitions and a second configuration for DMRS communication over the repetitions of the physical shared channel.