Enhanced DMRS OCC Selection for 24-Port NR Reception
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Solution Overview
Problem
In the new radio (NR) system, there is a challenge in ensuring that terminals can successfully receive demodulation reference signals (DMRS) with enhanced DMRS types, particularly when transitioning from a maximum of 12 orthogonal ports to 24 without increasing DMRS overheads.
Innovation Solution
The method involves configuring terminals and network devices to use orthogonal cover codes (OCC) with lengths of 2 or 4 for enhanced DMRS types, based on antenna port information and downlink information transmission formats, to ensure successful DMRS reception and reduce 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, then the system capacity and multiplexing capability are improved, but the DMRS overhead and terminal complexity increase
Solution Approach 1:
The patent applies dynamics by making the OCC length configurable and adaptable. The terminal can dynamically select between OCC length 2 and OCC length 4 based on the enhanced DMRS type configuration, allowing the system to optimize the number of orthogonal ports (up to 24 with OCC length 4) while controlling overhead by using shorter OCC length 2 when full capacity is not needed. This dynamic adaptation resolves the contradiction between system capacity and overhead.
2Adaptability or versatility
If the OCC length is increased to support more orthogonal ports, then the multiplexing capability is improved, but the terminal demodulation complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing a configurable OCC length parameter that can be set to either 2 or 4 based on the enhanced DMRS type. This parameter change allows the system to adjust the multiplexing capability (more orthogonal ports with length 4) while controlling terminal complexity (lower complexity with length 2). The terminal can select the appropriate OCC length according to its capabilities and the network configuration, resolving the contradiction between multiplexing capability and demodulation complexity.
3Adaptability or versatility
If the terminal uses OCC length 4 for enhanced DMRS type, then the number of supported antenna ports increases, but the demodulation overhead increases
Solution Approach 1:
The patent applies dynamics by enabling the terminal to dynamically select between OCC length 2 and OCC length 4 based on the enhanced DMRS type configuration. When full multiplexing capability is required, the terminal uses OCC length 4 to support up to 24 antenna ports. When overhead needs to be reduced, the terminal can use OCC length 2, which still provides adequate support for fewer ports. This dynamic selection resolves the contradiction between the number of supported antenna ports and demodulation overhead.
Data Source
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AI summary
This application provides a DMRS-based communication method and apparatus. In the method, a network device may configure a terminal to use an enhanced DMRS type, so that the terminal can receive a DMRS by using an 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 ensure that the terminal can successfully receive the DMRS.