CSI Reporting for Class B MIMO Antenna Arrays
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Solution Overview
Problem
Existing channel quality reporting processes in wireless communication systems do not adequately accommodate the reporting of channel state information associated with large two-dimensional array transmit antennas, which are crucial for efficient communication in advanced MIMO systems like FD-MIMO.
Innovation Solution
The implementation of a method and apparatus for user equipment (UE) and base station (BS) to handle configuration information for multiple-input multiple-output (MIMO) types, including Class B with a single non-zero-power CSI reference signal (NZP CSI-RS) resource that includes at most 8 antenna ports, enabling efficient CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing channel quality reporting processes are used, then the system maintains simplicity in reporting mechanisms, but the system fails to adequately accommodate reporting of channel state information for large two-dimensional array transmit antennas
Solution Approach 1:
The patent segments the large two-dimensional antenna array into multiple sub-arrays or groups, allowing CSI reporting to be performed in a structured manner. The base station configures multiple CSI processes with different CSI reference signal (CSI-RS) resources, each corresponding to specific antenna ports or groups. This segmentation enables the system to handle large antenna arrays by dividing them into manageable units that can be reported separately, thus improving adaptability while controlling complexity.
Solution Approach 2:
The patent introduces a new dimension to CSI reporting by supporting multiple MIMO types (Class A and Class B) within the same system. Class A MIMO handles conventional antenna configurations while Class B MIMO specifically addresses large two-dimensional arrays. This dimensional expansion allows the system to accommodate different antenna array geometries and sizes without overhauling the entire reporting framework, thereby improving versatility while maintaining manageable complexity through targeted extensions.
2Adaptability or versatility
If multiple MIMO types are supported simultaneously, then the system improves versatility in handling different antenna configurations, but the configuration information and processing requirements increase
Solution Approach 1:
The patent implements a universal CSI reporting framework that can handle both Class A and Class B MIMO types through a common configuration structure. The base station configures multiple CSI processes that can be associated with different MIMO types, allowing the same reporting mechanism to serve multiple functions. This multi-functionality enables the system to support diverse antenna configurations without requiring separate reporting systems for each MIMO type, thus improving versatility while controlling the growth of configuration complexity through standardized procedures.
3Device complexity
If a single NZP CSI-RS resource with at most 8 antenna ports is used for Class B MIMO, then the system reduces complexity of reference signal configuration, but the system limits the number of antenna ports that can be effectively monitored
Solution Approach 1:
The patent merges multiple CSI processes with different NZP CSI-RS resources into a unified Class B MIMO configuration. Each NZP CSI-RS resource is configured with at most 8 antenna ports as specified, but by combining multiple such resources across different CSI processes, the system effectively monitors a larger number of antenna ports. This merging approach allows the system to maintain simple individual resource configurations while achieving comprehensive coverage of large antenna arrays through the collective capability of multiple configured resources.
Data Source
AI summary
Methods and apparatuses for CSI reporting mechanisms are provided. A user equipment (UE) includes a transceiver and a processor operably connected to the transceiver. The transceiver is configured to receive configuration information including a channel state information (CSI) process, a first multiple-input multiple-output (MIMO) Type, and a second MIMO Type. The processor is configured to calculate and report, in response to receipt of the configuration information, a CSI for each of the first and second MIMO Types. The second MIMO Type is Class B and is associated with a single non-zero-power CSI reference signal (NZP CSI-RS) resource that includes at most 8 antenna ports.