DMRS Port Indication Size Determination in 5G NR
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Solution Overview
Problem
In 5G New Radio (NR) systems, different DMRS configurations lead to uncertainty in Downlink Control Information (DCI) size, increasing the complexity of operations for terminal devices and network overhead due to blind detection requirements for both Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH).
Innovation Solution
A method to determine the size of DMRS port indication information based on configuration information or protocol agreement, which includes time domain resource configuration and DMRS configuration, reducing the number of blind detections and network overhead by specifying the required number of bits for indicating DMRS port information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different DMRS configurations are supported, then the adaptability of the system is improved, but the device complexity increases due to blind detection requirements
Solution Approach 1:
The patent applies preliminary action by pre-configuring DMRS parameters through higher-layer signaling (RRC configuration) before DCI transmission. The terminal device is pre-informed of the DMRS configuration type, maximum number of ports, and other parameters, so that when DCI is received, the terminal already knows the expected DCI size and can directly decode without performing blind detection across multiple possible sizes. This resolves the contradiction by maintaining configuration adaptability while eliminating the complexity of blind detection.
2Adaptability or versatility
If different DMRS configurations are supported, then the adaptability of the system is improved, but the network overhead increases due to blind detection requirements
Solution Approach 1:
The patent reduces network overhead by performing preliminary configuration of DMRS parameters through RRC signaling. By pre-establishing the DMRS configuration type, maximum ports, and other parameters before DCI transmission, the network avoids the need to transmit multiple DCI formats with different sizes. The terminal can directly decode DCI using the pre-known configuration, eliminating repeated transmission attempts and reducing overall network signaling overhead while maintaining configuration flexibility.
3Reliability
If blind detection is performed for DCI sizes, then the reliability of message reception is improved, but the productivity decreases due to increased detection time
Solution Approach 1:
The patent applies preliminary action by pre-configuring DMRS parameters through higher-layer signaling (RRC configuration) before DCI transmission. The terminal device is pre-informed of the DMRS configuration type, maximum number of ports, and other parameters, so that when DCI is received, the terminal already knows the expected DCI size and can directly decode without performing blind detection across multiple possible sizes. This resolves the contradiction by maintaining configuration adaptability while eliminating the complexity of blind detection.
Data Source
AI summary
A method for determining a size of demodulation reference signal indication information, including: determining, by a terminal device, a size of demodulation reference signal DMRS port indication information based on configuration information or protocol agreement; the DMRS port indication information is used for indicating port information of a DMRS; the configuration information includes: a time domain resource configuration information set and/or DMRS configuration information. Another method for determining a size of demodulation reference signal indication information, a network device, a terminal device and a storage medium are also disclosed.