DMRS Port Mapping With Extended FD-OCC Orthogonalization
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Solution Overview
Problem
Future radio communication systems, such as NR, face challenges in increasing the number of DMRS ports without degrading communication throughput or quality, particularly in high-frequency bands like FR2, where orthogonalization of DMRS ports is not adequately addressed.
Innovation Solution
The proposed solution involves using a new frequency domain orthogonal cover code (FD-OCC) with lengths greater than 2 to manage DMRS ports effectively, allowing for appropriate port allocation and orthogonalization, thereby enhancing communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of DMRS ports is increased to support more layers and users, then communication capacity and throughput are improved, but orthogonalization between ports becomes difficult and interference increases
Solution Approach 1:
The patent extends the FD-OCC sequence length from traditional length-2 to length-4 in the frequency domain, creating an additional dimension for orthogonalization. This allows 4 DMRS ports to be orthogonalized within a single CDM group, effectively doubling the port capacity while maintaining orthogonality through the extended frequency domain codes.
Solution Approach 2:
The patent changes the FD-OCC sequence length parameter from 2 to 4, which fundamentally alters the orthogonalization capability. By modifying this key parameter, the system can support up to 8 DMRS ports per CDM group (compared to 4 in traditional systems), directly resolving the contradiction between port quantity and orthogonalization quality.
2Quantity of substance
If FD-OCC with length greater than 2 is introduced to increase DMRS ports, then port capacity is improved, but terminal complexity and processing difficulty increase
Solution Approach 1:
The patent segments the DMRS ports into CDM groups, where each group can support up to 8 ports through extended FD-OCC. This segmentation allows the terminal to process orthogonality within manageable groups rather than handling all ports simultaneously, reducing processing complexity while maintaining high port capacity.
Solution Approach 2:
The patent performs preliminary configuration of FD-OCC sequences and their orthogonal relationships during system initialization. By pre-defining the extended length-4 FD-OCC sequences and their orthogonal properties, the terminal avoids complex real-time calculations, reducing processing burden while supporting increased port capacity.
3Ease of operation
If traditional FD-OCC with length 2 is used, then terminal processing is simple, but the number of supported DMRS ports is limited
Solution Approach 1:
The patent designs the extended FD-OCC system to be universally applicable across different DMRS configurations and scenarios. The length-4 FD-OCC can support various port combinations (up to 8 ports per CDM group) and works with different numerologies and subcarrier spacings, providing a universal solution that maintains simplicity while enabling high capacity.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a receiving section that receives information associated with one frequency domain orthogonal cover code (FD-OCC) from among a first FD-OCC having a length of 2 and a second FD-OCC longer than 2 and that receives an antenna port field, and a control section that determines the parameter, based on the information, by using one association from among a first association between a value of the antenna port field and a parameter and a second association between the value and the parameter. According to an aspect of the present disclosure, it is possible to use an appropriate number of DMRS ports.