Terminal and Base Station DMRS Port Mapping for Two-Codeword Channels
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Solution Overview
Problem
The introduction of increased DMRS ports in future radio communication systems, such as Rel-18 NR, lacks a clear definition of the antenna port table, which hinders suitable improvements in communication throughput and quality.
Innovation Solution
A terminal and base station are designed to support a combination of category-1 and category-2 DMRS ports in code division multiplexing groups, with a control mechanism that schedules shared channels based on downlink control information, enabling appropriate communication control even with enhanced DMRS port configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of DMRS ports is increased in future radio communication systems (Rel-18 NR), then communication throughput and quality can be improved, but the system complexity and control difficulty increase due to lack of clear antenna port table definition
Solution Approach 1:
The patent segments the DMRS ports into category-1 DMRS ports and category-2 DMRS ports, organizing them into separate CDM groups. This segmentation allows the system to manage a larger total number of DMRS ports (up to 16 ports across 4 CDM groups) by dividing them into manageable categories, each with specific port combinations and mapping rules, thereby reducing system complexity while maintaining high throughput capability
Solution Approach 2:
The patent introduces a new dimension of classification by creating multiple CDM groups (first CDM group with ports 0-3, second CDM group with ports 4-7, third CDM group with ports 8-11, fourth CDM group with ports 12-15) and assigning different port combinations to different spatial layers and transmission/reception points. This dimensional organization enables efficient management of increased DMRS ports through structured port tables that map ports to specific transmission scenarios
2Reliability
If the number of DMRS ports is increased, then communication quality can be enhanced, but control difficulty increases due to insufficient antenna port table definition
Solution Approach 1:
The patent establishes predefined antenna port tables that specify exact port combinations for different transmission scenarios before actual communication occurs. The tables define which category-1 and category-2 DMRS ports are combined in each CDM group, and how they map to spatial layers and transmission/reception points. This preliminary definition eliminates control difficulty during operation, as the system simply follows the pre-established port mappings rather than dynamically determining them
Solution Approach 2:
The patent changes the parameter organization by introducing category-based port classification and CDM group structure. Instead of treating all DMRS ports uniformly, the system assigns different parameters (category identifiers, CDM group assignments, port combination rules) to different port sets. This parameter differentiation enables precise control over port usage while maintaining ease of operation through standardized tables that define valid parameter combinations for various transmission scenarios
Data Source
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AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives, when a combination of a category-1 demodulation reference signal (DMRS) port and a category-2 DMRS port in at least one code division multiplexing (CDM) group is supported, downlink control information (DCI) indicating the combination and scheduling a shared channel for two codewords; and a control section that controls transmission or reception of the shared channel on the basis of the combination, wherein the combination includes an entry indicating at least one of a DMRS port across the CDM group and a DMRS port 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 system.