Terminal DMRS Port Mapping for Multi-TRP Shared Channel Control
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Solution Overview
Problem
The introduction of increased DMRS ports in future radio communication systems, such as Rel-18 NR, has not been adequately addressed in terms of antenna port table indications and communication quality improvements.
Innovation Solution
A terminal and base station design that supports combinations of category-1, category-2, and category-3 DMRS ports in code division multiplexing groups, with a control section managing shared channels based on these combinations, including entries across transmission/reception points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of DMRS ports is increased to support more antenna ports and transmission/reception points, then the communication capacity and versatility are improved, but the device complexity and difficulty of control increase
Solution Approach 1:
The patent segments DMRS ports into three distinct categories (category-1 for single TRP, category-2 for multi-TRP, category-3 for enhanced multi-TRP) with specific port number ranges and CDM group configurations. This segmentation allows the system to support increased communication capacity through multiple TRPs while managing control complexity by providing clear, structured rules for each category, eliminating the need for complex dynamic decisions about port allocation.
Solution Approach 2:
The patent introduces specific parameter changes including defining new DMRS port number ranges (0-7 for category-1, 8-15 for category-2, 16-23 for category-3), specifying CDM group configurations (1 or 2 groups), and establishing maximum TRP counts (1 for category-1, 2 for category-2 and 3). These parameter changes provide a standardized framework that increases versatility while controlling complexity through explicit specifications.
2Adaptability or versatility
If category-3 DMRS ports are introduced to support enhanced multi-TRP communication, then the adaptability is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent applies local quality by assigning distinct properties to different DMRS port categories: category-1 ports (0-7) are associated with single TRP operations, category-2 ports (8-15) with two TRPs, and category-3 ports (16-23) with enhanced multi-TRP support. Each category has specific CDM group configurations and maximum TRP counts. This localized differentiation makes port identification and measurement straightforward by matching observed port numbers and configurations to their predefined category characteristics.
Data Source
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Figure 3A~3C
AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives, when combinations of category-1 demodulation reference signal (DMRS) ports and category-2 DMRS ports in at least one code division multiplexing (CDM) group are supported, downlink control information (DCI) that indicates the combinations and that schedules a shared channel for one or two codewords; and a control section that controls, based on the combinations, transmission or reception of the shared channel, wherein the combinations further include a combination of category-3 DMRS ports and include an entry indicating at least one of DMRS ports across the CDM groups and DMRS ports corresponding to a plurality of transmission/reception points. An aspect of the present disclosure enables communication to be appropriately controlled even when the number of DMRS ports is increased as compared with any existing radio communication system.