Aperiodic CSI-RS Allocation for MIMO Overhead Reduction
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Solution Overview
Problem
The CSI-RS overhead has increased in mobile communication systems due to the increase in the number of antennas supported by base stations and the necessity of per-terminal CSI-RS functionality for UE-specific beamformed CSI-RS technology, requiring a method to efficiently allocate and manage aperiodic CSI-RS for efficient system operation.
Innovation Solution
The method involves enabling base stations to assign CSI-RS resource information in advance to terminals and trigger aperiodic CSI-RS allocation, allowing CSI-RS transmission without PDSCH in specific subframes or subbands, and dynamically allocating resources based on PCFICH, enabling flexible port indexing and resource configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas supported by base stations is increased, then MIMO transmission capability is improved, but CSI-RS overhead increases
Solution Approach 1:
The patent implements dynamic CSI-RS resource allocation where the base station can flexibly allocate CSI-RS resources in time and frequency domains based on actual system conditions. The allocation is not fixed but adapts to changing traffic patterns and channel conditions, allowing the system to maintain high MIMO capability while minimizing CSI-RS overhead when full MIMO operation is not required.
Solution Approach 2:
The patent applies different CSI-RS allocation strategies to different terminals and different resource regions. Instead of uniformly allocating CSI-RS across all terminals and resources, the system tailors the allocation to specific terminal needs and local channel conditions, reducing overall overhead while maintaining necessary MIMO functionality where required.
2Measurement precision
If per-terminal CSI-RS functionality is implemented for UE-specific beamformed CSI-RS, then beamforming precision is improved, but system complexity increases
Solution Approach 1:
The patent segments the CSI-RS resource allocation into terminal-specific portions, where each terminal receives customized CSI-RS resources tailored to its specific beamforming requirements. This segmentation allows precise beamforming for each terminal while managing overall system complexity through structured resource division and independent configuration of terminal-specific parameters.
3Adaptability or versatility
If aperiodic CSI-RS allocation is used instead of periodic allocation, then resource flexibility is improved, but control signaling overhead increases
Solution Approach 1:
The patent employs periodic triggering mechanisms for aperiodic CSI-RS allocation. Instead of continuous control signaling, the system uses periodic triggers that activate aperiodic CSI-RS transmission only when needed, combining the resource flexibility of aperiodic allocation with the signaling efficiency of periodic patterns. This reduces control signaling overhead while maintaining the adaptability benefits of aperiodic allocation.
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.A method by which a terminal receives a signal in a mobile communication system, according to one embodiment of the present specification, comprises the steps of: receiving channel state information-reference signal (CSI-RS) mode information; and receiving a signal on the basis of the CSI-RS mode information. Unlike a conventional method of allowing a base station to periodically set the CSI-RS in a terminal at a predetermined position such that the terminal receives the CSI-RS and generates and reports channel state information, the present invention proposes a method by which a base station allocates, to a terminal, a reference signal transmission for enabling aperiodic generation of the channel state information for a system having various numbers of transmission antenna ports such as one, two, four, eight, twelve, sixteen or thirty-two transmission antenna ports, and receives the channel state information report. In addition, a method for transferring ZP CSI-RS and quasi co-location (QCL) information for supporting rate matching thereby is also proposed.