DMRS Indication for 3D MIMO Using Variable OCC Lengths
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Solution Overview
Problem
The existing 2D MIMO technology in wireless communication systems is inadequate for efficiently utilizing the spectrum, as it does not support DMRS indication in 3D MIMO, which limits system performance by not fully leveraging the degrees of freedom in the vertical space.
Innovation Solution
A method and system for indicating De Modulation Reference Signals (DMRS) in 3D MIMO by allocating designated DMRS ports, layers, and lengths of Orthogonal Cover Codes (OCC) based on configuration parameters, allowing for efficient DMRS indication and improved system performance by utilizing OCCs of different lengths for various data flow transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 3D MIMO is adopted to improve spectrum utilization, then system performance is improved, but existing DMRS indication methods become inadequate
Solution Approach 1:
The patent extends the conventional 2D MIMO DMRS indication to 3D MIMO by introducing a new indication dimension. Specifically, it uses 4-bit DCI fields to indicate not only the DMRS port but also the OCC length (2 or 4) and scrambling identity, thereby accommodating the additional degree of freedom in the vertical dimension while maintaining backward compatibility with 2D MIMO systems.
Solution Approach 2:
The patent changes the DMRS configuration parameters by introducing variable OCC lengths (2 or 4) and associated scrambling identities for 3D MIMO, while keeping the same DCI structure and bit fields as 2D MIMO. This allows the system to adapt to 3D MIMO requirements through parameter extension rather than structural overhaul.
2Productivity
If multiple OCC lengths are allocated for different data flow transmissions, then DMRS indication efficiency is improved, but DCI overhead increases
Solution Approach 1:
The patent merges the indication of DMRS port, OCC length, and scrambling identity into a unified 4-bit indication field within the existing DCI structure. By combining these parameters into a single compact representation, the system achieves efficient DMRS indication for 3D MIMO without significantly increasing DCI overhead.
Solution Approach 2:
The patent designs a universal DMRS indication mechanism that serves both 2D and 3D MIMO systems. The same 4-bit indication field and DCI structure are used for both conventional 2D MIMO and advanced 3D MIMO, allowing the system to maintain backward compatibility while supporting enhanced functionality.
Data Source
AI summary
A demodulation reference signal (DMRS) indication method includes: a base station allocating designated DMRS ports, numbers of layers and orthogonal cover code (OCC) lengths to a user equipment (UE) according to a DMRS configuration parameter indication table, wherein a plurality of DMRS configuration parameter indication entries with a plurality of OCC length combinations of at least two OCC lengths are recorded in the DMRS configuration parameter indication table; according to DMRS configuration parameter information allocated to the UE, generating corresponding DMRS indication information, and sending the DMRS indication information to a corresponding UE. Also disclosed are a base station, a UE and a DMRS indication system.