DMRS Configuration via DCI Port Indication
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Solution Overview
Problem
The existing methods for configuring Demodulation Reference Signals (DMRS) in MIMO transmission systems are complex and burdensome, particularly in scenarios with multiple users and varying bandwidths, leading to difficulties in ensuring orthogonality and requiring frequent reloading of configuration information.
Innovation Solution
A method that involves receiving a DMRS indication index from the network, determining the appropriate ports for transmission, and retrieving preset DMRS configuration parameters to configure the DMRS, thereby simplifying the configuration process and reducing operational load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OCC is introduced to ensure orthogonality of DMRS sequences for MU-MIMO transmission, then orthogonality between different users is improved, but the system becomes incompatible with group hopping or sequence hopping configurations
Solution Approach 1:
The patent introduces dynamic port indication through DCI signaling, allowing the network to flexibly assign DMRS ports and OCC configurations based on current transmission needs. This dynamic approach enables the system to adapt between different hopping configurations and OCC usage scenarios, resolving the contradiction by making the system configurable rather than fixed.
Solution Approach 2:
The patent changes the parameter of port indication from implicit to explicit through DCI signaling. By explicitly indicating the DMRS port in DCI, the system can dynamically select appropriate OCC configurations and hopping patterns, allowing parameter flexibility that resolves the incompatibility between OCC and hopping configurations.
2Adaptability or versatility
If multiple DMRS configurations are signaled for different transmission modes, then adaptability to different transmission scenarios is improved, but configuration complexity and operational load increase
Solution Approach 1:
The patent creates a universal DMRS configuration mechanism where a single DCI-based port indication method serves multiple transmission modes (SU-MIMO, MU-MIMO, different ranks). Instead of maintaining separate configuration sets for each mode, the universal indication mechanism adapts to different scenarios, reducing complexity while preserving adaptability.
Solution Approach 2:
The patent performs preliminary configuration by pre-defining DMRS port mappings and OCC patterns in the standard. The DCI signaling then simply activates the appropriate pre-configured option rather than transmitting full configuration parameters, reducing operational load while maintaining support for multiple transmission modes.
3Manufacturing precision
If DMRS configuration information is reloaded for each transmission, then configuration accuracy is improved, but transmission efficiency and productivity decrease
Solution Approach 1:
The patent uses DCI signaling to copy or indicate the appropriate DMRS port configuration from a set of pre-defined options rather than transmitting complete configuration parameters each time. This copying approach maintains configuration accuracy by referencing pre-validated settings while improving efficiency by reducing signaling overhead.
Solution Approach 2:
The patent performs preliminary configuration by pre-defining DMRS port mappings and OCC patterns in the standard specifications. The actual transmission only requires activating the appropriate pre-configured option through DCI indication, eliminating the need for full configuration reloading while maintaining accuracy.
4Quantity of substance
If short DMRS sequences are used to reduce overhead, then resource efficiency is improved, but orthogonality between multiple streams becomes difficult to ensure
Solution Approach 1:
The patent introduces the OCC dimension to enhance orthogonality. By applying orthogonal cover codes across the time domain (different slots) or code domain, the system achieves stream separation without requiring longer sequences in the frequency domain. This dimensional approach maintains short DMRS length while ensuring orthogonality through additional coding layers.
Solution Approach 2:
The patent combines multiple DMRS sequences with different OCC patterns to create a composite reference signal structure. By layering orthogonal codes on top of short base sequences, the system achieves the orthogonality properties of long sequences while maintaining the low overhead advantage of short sequences.
Data Source
AI summary
A method, an apparatus and a system for configuring a Demodulation Reference Signal (DMRS) are disclosed in the present invention. The method includes: receiving a DMRS indication index transmitted from a network side; determining at least one port used for the local transmission of the DMRS; acquiring the predetermined DMRS configuration parameters corresponding to the DMRS indication index and the at least one port, and configuring, according to the DMRS configuration parameters, the DMRS to be transmitted from the at least one port. Therefore, the terminal can implement the configuration of the DMRS without reloading the corresponding configuration information. Thus, the implementation complexity of the DMRS configuration flow is decreased, and the operation load of the terminal is also reduced.