Dynamic DMRS Configuration Signaling for Wireless Adaptation
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Solution Overview
Problem
Wireless communication systems face inefficiencies due to outdated radio resource control (RRC) configured demodulation reference signals (DMRS) that are not optimally defined for changing channel or reception conditions, leading to suboptimal communication quality between user equipment (UE) and transmission and reception points (TRPs).
Innovation Solution
The implementation of dynamic DMRS configuration signaling allows user equipment (UE) to receive and select between multiple DMRS configurations based on indicated transmission modes and associations, enabling adaptive DMRS usage per transmission mode or TRP, thereby supporting efficient communication across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If static RRC configured DMRS are used, then device complexity is reduced, but communication quality deteriorates due to inability to adapt to changing channel conditions
Solution Approach 1:
The patent implements dynamic DMRS configuration by introducing a MAC CE signaling mechanism that allows the gNodeB to activate different DMRS configurations (first and second DMRS configurations) based on current channel conditions and transmission modes. This dynamic switching capability enables the system to adapt to changing reception conditions while maintaining manageable complexity through predefined configuration sets.
Solution Approach 2:
The patent changes the configuration parameters of DMRS by introducing multiple DMRS configurations with different properties (first DMRS configuration and second DMRS configuration) that can be selectively activated. The MAC CE signaling dynamically modifies which configuration is active based on transmission mode indications, allowing parameter adaptation without requiring complete reconfiguration of the entire DMRS system.
2Reliability
If multiple DMRS configurations are supported, then communication quality improves through better channel adaptation, but signaling complexity increases
Solution Approach 1:
The patent segments the DMRS configuration space into distinct, manageable configurations (first DMRS configuration and second DMRS configuration), each optimized for specific transmission modes or channel conditions. The MAC CE signaling then references these predefined segments using compact identifiers, reducing the complexity of conveying configuration information while maintaining the benefits of multiple optimized configurations.
Solution Approach 2:
The patent introduces MAC CE signaling as an intermediary mechanism between the gNodeB and UE for configuring DMRS. This intermediary layer simplifies the signaling process by providing a dedicated, standardized interface for transmitting configuration selections, abstracting the complexity of multiple DMRS configurations from the overall signaling protocol while enabling reliable communication quality adaptation.
3Productivity
If dynamic DMRS configuration is implemented, then communication efficiency improves, but processing time at UE increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple DMRS configurations (first and second DMRS configurations) with their respective parameters and properties before actual communication begins. The UE receives these predefined configurations through RRC signaling in advance, so that when dynamic switching is needed via MAC CE, the UE can quickly select and switch between pre-prepared configurations without performing complex real-time calculations or reconfigurations.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station communicates with a UE via transmission reception points (TRPs). A UE receives, from a base station, control signaling identifying a set of demodulation reference signal (DMRS) configurations. The UE receives, from the base station, control signaling activating a first DMRS configuration and a second DMRS configuration. The UE receives an indication for the UE to use a first transmission mode of a set of transmission modes to communicate with multiple TRPs of the base station. The UE selects at least one of the first DMRS configuration or the second DMRS configuration based on the indicated first transmission mode and a pre-defined logical association. The UE then receives DMRS signals from the TRPs of the base station, according to the selected at least one of the first DMRS configuration or the second DMRS configuration.