DMRS Port Configuration Using Orthogonal Cover Codes
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Solution Overview
Problem
In future radio communication systems, such as NR, the number of DMRS ports needs to increase to maintain communication quality and throughput, but existing methods have not sufficiently addressed how to effectively utilize this increased number of ports.
Innovation Solution
A terminal and base station configuration that uses a first orthogonal cover code for up to eight DMRS ports and a second orthogonal cover code for more than eight DMRS ports, allowing for efficient transmission and reception of DMRS signals across different configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of DMRS ports is increased to maintain communication quality and throughput in future radio communication systems, then communication quality and throughput are improved, but existing methods cannot sufficiently address how to effectively utilize this increased number of ports
Solution Approach 1:
The patent segments the DMRS port configuration into two distinct types: DMRS configuration type 1 supporting up to 8 ports, and DMRS configuration type 2 supporting up to 12 ports. This segmentation allows the system to select the appropriate configuration type based on the required number of ports, effectively resolving the limitation of existing methods that cannot sufficiently address utilization of increased DMRS ports.
Solution Approach 2:
The patent introduces dynamic selection between first and second orthogonal cover codes based on the DMRS port index. When the DMRS port index is less than 8, the first orthogonal cover code is used; when the index is 8 or greater, the second orthogonal cover code is used. This dynamic adaptation enables effective utilization of increased DMRS ports while maintaining orthogonality and communication quality.
2Quantity of substance
If the number of DMRS ports exceeds eight for configuration type 1 or twelve for configuration type 2, then more ports can be utilized, but existing orthogonal cover code methods cannot support this extended range
Solution Approach 1:
The patent changes the parameter of orthogonal cover code selection based on the DMRS port index value. By introducing a threshold-based parameter change (using first code for indices < 8, second code for indices ≥ 8), the system can support extended DMRS port ranges while managing complexity through clear, rule-based code assignment.
Solution Approach 2:
The patent creates a universal DMRS port configuration framework that works for both configuration type 1 (up to 8 ports) and configuration type 2 (up to 12 ports) using the same orthogonal cover code selection mechanism. This multi-functional approach allows the system to handle different configuration types and port ranges with a unified method, reducing overall system complexity.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a control section that uses a first orthogonal cover code for any one of not more than eight DMRS ports for a demodulation reference signal (DMRS) configuration type 1 and not more than 12 DMRS ports for a DMRS configuration type 2, and uses a second orthogonal cover code for any one of more than eight DMRS ports for the DMRS configuration type 1 and more than 12 DMRS ports for the DMRS configuration type 2, and a transmitting/receiving section that transmits or receives DMRSs using the DMRS ports. According to an aspect of the present disclosure, the suitable number of DMRS ports can be used.