CSI-RS Port Segmentation for 2D-AAS Channel Estimation
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Solution Overview
Problem
In wireless communication systems supporting multiple antennas, existing technologies face challenges in efficiently transmitting reference signals to accurately estimate channel state information, especially with extended antenna configurations like 8-Tx antennas, leading to increased overhead and potential interference.
Innovation Solution
The method involves transmitting CSI-RS using a combination of CSI-RSs configured for vertical and horizontal antenna domains, with power boosting and code division multiplexing, and selecting specific antenna ports for transmission to reduce overhead and improve channel estimation accuracy, utilizing RRC signaling for configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted for all antenna ports in extended MIMO configurations (e.g., 8-Tx antennas), then channel estimation accuracy is improved, but overhead increases
Solution Approach 1:
The patent segments the antenna ports into two distinct groups: first domain antenna ports (0-5) and second domain antenna ports (6-11). Each group is assigned its own reference signal (first CSI-RS and second CSI-RS respectively), allowing independent configuration and transmission. This segmentation enables the system to transmit reference signals for only the necessary antenna ports rather than all ports, thereby reducing overhead while maintaining channel estimation accuracy for the active antenna configuration.
2Loss of information
If reference signals are transmitted for all antenna ports in extended MIMO configurations, then channel state information coverage is improved, but interference increases
Solution Approach 1:
By dividing antenna ports into separate domains with dedicated reference signals, the patent reduces interference between reference signals. Each domain's reference signal can be configured independently with appropriate resource element allocations, preventing signal collisions and reducing overall interference in the system while still providing comprehensive channel state information coverage for all necessary antenna ports.
Solution Approach 2:
The patent applies local quality by allowing different reference signal configurations for different antenna port domains. The first CSI-RS and second CSI-RS can have different time-frequency resource allocations, power levels, and scrambling sequences optimized for their respective antenna domains. This localized optimization reduces interference in each domain while maintaining overall channel state information coverage.
3Quantity of substance
If existing CSI-RS ports are utilized more effectively through selection, then overhead is reduced, but configuration complexity increases
Solution Approach 1:
The patent reduces overhead by segmenting antenna ports into two domains and selectively transmitting reference signals only for the necessary domains. The network can configure and activate only the required first domain or second domain reference signals based on the actual antenna configuration being used, avoiding transmission of redundant reference signals for all possible antenna ports. This selective activation significantly reduces reference signal overhead while the standardized segmentation approach keeps configuration complexity manageable.
Data Source
AI summary
The present invention relates to a method and an apparatus for transmitting a reference signal by a transmitting side in a wireless communication system supporting multiple antennas. Specifically, the present invention comprises a step of transmitting a first reference signal for a plurality of first domain antennas and a second reference signal for a plurality of second domain antennas, wherein the second reference signal is used for antennas included in the second domain antennas except for antennas included in the first domain antennas and a particular antenna port, and the particular antenna port is selected from antenna ports included in multiple antennas except for the first domain antennas and the second domain antennas.