Enhanced DMRS OCC Mapping for 24-Port MIMO Reception
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Solution Overview
Problem
In the NR system, ensuring successful reception of DMRS with enhanced DMRS type without increasing overheads is a challenge, particularly in MIMO scenarios where the number of orthogonal ports needs to be increased from 12 to 24.
Innovation Solution
The method involves configuring terminals to use orthogonal cover codes (OCC) with lengths of 2 or 4 for enhanced DMRS type, based on antenna port information and downlink information transmission, to ensure successful DMRS reception, reducing demodulation complexity and overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of orthogonal DMRS ports is increased from 12 to 24 in enhanced DMRS type, then the MIMO capability is improved, but the terminal demodulation complexity increases and reception reliability deteriorates
Solution Approach 1:
The patent segments the DMRS port indexing into two parts: a first index indicating the port number (0-23) and a second index indicating the OCC length type (length-2 or length-4). This segmentation allows the terminal to separately determine port identity and OCC configuration, reducing demodulation complexity while supporting up to 24 orthogonal ports.
Solution Approach 2:
The patent introduces dynamic OCC length selection where the OCC length (2 or 4) is adaptively determined based on the second index. This dynamic approach enables the system to adjust the OCC length according to channel conditions and port requirements, improving reception reliability while maintaining support for enhanced MIMO capabilities.
2Adaptability or versatility
If the OCC length is increased to support more orthogonal ports, then the number of orthogonal DMRS ports is improved, but the DMRS overhead increases
Solution Approach 1:
The patent changes the parameter of OCC length from fixed to variable, supporting both length-2 and length-4 OCCs. By using length-2 OCC for ports requiring fewer orthogonal sequences and length-4 OCC only when necessary, the system achieves up to 24 orthogonal ports while minimizing the overall DMRS overhead compared to uniformly using length-4 OCC.
3Adaptability or versatility
If the terminal uses unknown OCC type for DMRS reception, then the system flexibility is improved, but the demodulation accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the second index that indicates the OCC length type before DMRS reception. The terminal uses this pre-indicated information to correctly select the OCC length for demodulation, eliminating the uncertainty of unknown OCC type and ensuring accurate DMRS reception while maintaining system flexibility.
Data Source
AI summary
A demodulation reference signal (DMRS)-based communication method includes a network device configuring a terminal to use an enhanced DMRS type, so that the terminal can receive a DMRS by using an orthogonal cover code (OCC) corresponding to the enhanced DMRS type, where the OCC is, for example, a sequence with a length of 2 or 4, to avoid a receiving failure due to a case that the terminal does not know whether to use an OCC corresponding to the enhanced DMRS type or an OCC corresponding to a DMRS type 1 or a DMRS type 2, and so that the terminal receives the DMRS.