DCI Frequency Resource Grouping for Multi-TRP FDM Transmission
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Solution Overview
Problem
Current communication systems, such as 5G, do not support multi-TRP transmission in a frequency division multiplexing (FDM) mode due to limitations in DCI transmission on physical downlink control channels, which only allow configuration of one frequency domain resource group.
Innovation Solution
A DCI transmission method that allocates frequency domain resource groups, where each group corresponds to a spatial information indication, enabling multi-TRP transmission by determining N frequency domain resource groups for PDSCH transmission, with N being greater than or equal to 2, and utilizing various methods to indicate these groups without increasing DCI overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DCI on PDCCH configures only one frequency domain resource group, then DCI transmission is simple, but multi-TRP transmission in FDM mode cannot be supported
Solution Approach 1:
The patent segments the frequency domain resources into multiple resource groups (at least two groups), where each group can be independently allocated to different TRPs. This segmentation allows the system to support multi-TRP transmission by assigning different frequency resource groups to different transmission reception points, thereby resolving the contradiction between maintaining simple DCI structure and supporting versatile multi-TRP transmission.
2Productivity
If multiple frequency domain resource groups are allocated for multi-TRP transmission, then FDM mode transmission is enabled, but DCI overhead increases
Solution Approach 1:
The patent merges the indication of multiple frequency domain resource groups into a unified DCI structure. Instead of separately indicating each resource group, the invention combines them into a single resource allocation field that can represent multiple groups, thereby enabling efficient multi-TRP resource allocation while minimizing the increase in DCI overhead.
Solution Approach 2:
The patent designs a universal resource allocation mechanism that can function both for single-TRP and multi-TRP scenarios. The same DCI structure and resource allocation fields are used regardless of whether one or multiple TRPs are involved, allowing the system to maintain DCI efficiency while supporting versatile transmission modes without requiring separate signaling for different scenarios.
Data Source
AI summary
A DCI transmission method and a communication device are provided. The method includes: performing a transmission of DCI, wherein the DCI includes FDRA information, the FDRA information is used to determine N frequency domain resource groups, the N frequency domain resource groups are N groups of frequency domain resources used by the communication device for a PDSCH transmission, the N frequency domain resource groups respectively correspond to N spatial information indications, and N is an integer which is greater than or equal to 2.