MRS Configuration for 5G Uplink Multi-User MIMO Channel Estimation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing up-link demodulation reference signals (UL-DMRS) and quasi-co-location of antenna ports or beams, particularly in 5G communication systems, which affect channel estimation and multi-user MIMO communications.
Innovation Solution
The implementation of a method to configure and transmit measurement reference signals (MRS) resources, including quasi-co-located antenna ports and beams, to enhance up-link multi-user MIMO communications by using a controller to configure MRS resources and a transceiver to transmit channel state information reference signals (CSI-RS) for estimating channel parameters, along with specific cyclic shift and orthogonal cover code parameters for DMRS sequence generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antenna ports are configured for up-link multi-user MIMO communications, then the capacity and data traffic support are improved, but the complexity of managing reference signals and channel estimation increases
Solution Approach 1:
The patent segments reference signals into different types (DMRS for demodulation, CSI-RS for channel state information, MRS for measurement) with distinct functions and configurations. Each antenna port can be assigned specific reference signal resources, allowing independent management and reducing overall system complexity while supporting multiple users simultaneously
Solution Approach 2:
The patent introduces dynamic configuration of reference signal resources where antenna ports can be dynamically assigned to different reference signal resources based on channel conditions and user requirements. The quasi-co-location relationships can be dynamically updated through signaling, enabling flexible adaptation to changing network conditions while maintaining efficient resource utilization
2Measurement precision
If quasi-co-location relationships are established between antenna ports, then channel estimation accuracy is improved, but the signaling overhead and configuration complexity increase
Solution Approach 1:
The patent merges quasi-co-location information with existing reference signal configurations by indicating QCL relationships through existing signaling fields (e.g., TCI states, QCL indicators) rather than introducing separate dedicated signaling. This allows channel estimation benefits of QCL while minimizing additional signaling overhead by reusing existing information structures
Solution Approach 2:
The patent changes the representation of QCL relationships from explicit detailed parameter signaling to compact indicator-based signaling. By using indices and identifiers to represent QCL relationships rather than transmitting full parameter sets, the patent reduces signaling overhead while maintaining the ability to convey necessary channel estimation information
Data Source
AI summary
Methods and apparatuses for transmitting and receiving measurement reference signal (MRS) configurations in a wireless communication system. A method includes transmitting to a user equipment (UE), or receiving from a base station, information on MRS configurations that include information on an identity of an MRS, information on a set of large-scale channel properties associated with a quasi co-location (QCL) relationship for a demodulation reference signal (DMRS) of a physical downlink shared channel (PDSCH), and information on a bandwidth for the MRS. The method further includes transmitting to the UE, or receiving from a base station, downlink control information (DCI) scheduling the PDSCH and indicating an MRS configuration for the PDSCH. The set of large-scale channel properties include, based on type, one or more of doppler shift, doppler spread, average delay, and delay spread.