CSI-RS Resource Allocation for mmWave Beamforming
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Solution Overview
Problem
Wireless communication systems using the mmWave band face high propagation loss, leading to short service coverage and performance degradation due to the need for efficient allocation of radio resources for reference signals in beamforming configurations, which is complex and inefficient in existing systems.
Innovation Solution
A method and apparatus for efficiently allocating radio resources for channel state information reference signals (CSI-RS) based on beamforming structure and frame structure information, enabling effective transmission and reception performance by generating and transmitting resource allocation information, and allowing user equipment to receive and interpret this information for optimal channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beamforming technology is adopted to reduce signal path loss and increase signal propagation distance, then service coverage is expanded, but device complexity increases due to the need for channel information transmission, measurement, and feedback processes
Solution Approach 1:
The patent segments the reference signal transmission by assigning different CSI-RS resources to different antenna ports and beams. Each antenna port has its own dedicated reference signal resources, allowing independent channel estimation for each beam while reducing the overall complexity of managing all reference signals together
Solution Approach 2:
The patent introduces a new dimension of resource allocation by configuring CSI-RS resources in the time-frequency domain with specific periodicities, subframe offsets, and resource element positions. This multi-dimensional resource configuration approach efficiently manages reference signals across multiple antenna ports without increasing system complexity
2Measurement precision
If per-antenna reference signal transmission is implemented for beamforming optimization, then channel information accuracy is improved, but overhead and complexity increase significantly
Solution Approach 1:
The patent makes the CSI-RS resource configuration universal by defining a standardized parameter set that can be applied across multiple antenna ports and beams. The same resource allocation mechanism serves multiple functions: channel estimation, beam management, and quality of service measurement, reducing overall system overhead
Solution Approach 2:
The patent optimizes the balance between measurement precision and overhead by allowing flexible configuration of CSI-RS parameters such as periodicity (10ms, 20ms, 40ms), subframe offset, and resource element positions. These parameter changes enable the system to adapt reference signal density to actual channel conditions, reducing overhead when channel conditions are stable while maintaining accuracy when conditions change rapidly
Data Source
AI summary
Provided are a method and apparatus for radio resource allocation. The radio resource allocation method for a base station may include: obtaining at least one of beamforming structure information and frame structure information; generating resource allocation information for a CSI-RS (channel state information reference signal) on the basis of at least one of the beamforming structure information and the frame structure information; and transmitting the resource allocation information. As a result, it is possible to efficiently perform resource allocation.