DMRS Indication via Segmentation and Scrambling Identity
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Solution Overview
Problem
In 5G communication systems, the increase in orthogonal transport layers for MU-MIMO support leads to an increase in DMRS information, requiring a new method to indicate this information through DCI, while also addressing the challenge of configuring multiple CSI-RS resources and maintaining SRS-based channel estimation accuracy with limited UE transmission power.
Innovation Solution
The proposed solution involves a method for indicating DMRS information through DCI using additional bits or table indicators, configuring multiple CSI-RS resources for accurate channel estimation, and optimizing SRS transmission to maintain channel estimation accuracy despite limited power constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of orthogonal transport layers for MU-MIMO is increased, then the system capacity and data rate are improved, but the amount of DMRS information increases requiring more DCI bits
Solution Approach 1:
The patent segments the indication of DMRS information by dividing it into two parts: DMRS port indication and scrambling identity indication. This segmentation allows independent optimization of each indication method, enabling efficient signaling for large numbers of transport layers without requiring excessive DCI bits for the complete DMRS configuration
Solution Approach 2:
The patent introduces a new dimension for DMRS information indication by using scrambling identity as an additional parameter beyond traditional port indication. This dimensional expansion allows the system to differentiate and identify multiple DMRS sequences associated with different transport layers, thereby supporting increased system capacity while maintaining efficient signaling overhead
2Measurement precision
If multiple CSI-RS resources are configured for accurate channel estimation, then the channel estimation accuracy is improved, but the configuration complexity and signaling overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CSI-RS resources with distinct scrambling identities before channel estimation is performed. This allows the UE to efficiently select and use the appropriate CSI-RS resources based on the indicated scrambling identity, achieving accurate channel estimation without requiring complex real-time configuration decisions
Solution Approach 2:
The patent uses scrambling identity as an intermediary parameter that links the DCI indication to the pre-configured CSI-RS resources. This intermediary enables the system to efficiently manage multiple CSI-RS resources by providing a simple indication mechanism that points to the appropriate resources, thereby reducing configuration complexity while maintaining measurement precision
3Measurement precision
If SRS transmission power is increased to maintain channel estimation accuracy, then the channel estimation accuracy is improved, but the UE transmission power consumption increases
Solution Approach 1:
The patent implements feedback mechanisms where the gNB indicates the appropriate SRS resource and scrambling identity to the UE based on current channel conditions and power considerations. This feedback enables dynamic adjustment of SRS transmission parameters, allowing the system to maintain channel estimation accuracy while optimizing UE power consumption by transmitting SRS only when and where necessary
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present invention relates to a method and an apparatus for transmitting a reference signal, the method of a terminal according to the present invention comprising: receiving, through a higher layer signaling, configuration information including first information indicating one of a first demodulation reference signal (DMRS)-related table and a second DMRS-related table; receiving control information including second information on DMRS information; analyzing, based on the second information, a DMRS-related table indicated by the first information; and receiving a DMRS based on the result of the analysis.