CSI Segment Multiplexing for Large 2D Antenna Arrays
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Solution Overview
Problem
Existing channel state information (CSI) reporting processes in wireless communications systems do not adequately accommodate large, two-dimensional array transmit antennas or antenna array geometries with a large number of elements, particularly in 5G systems, leading to inefficiencies in reporting and increased complexity.
Innovation Solution
Implement methods and apparatuses for CSI multiplexing, where N segments of CSI are transmitted in one slot, with a first segment including a rank indicator (RI) and other CSI parameters, enabling efficient reporting using a user equipment (UE) and base station (BS) configuration and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing CSI reporting processes are used, then the system maintains simplicity in reporting structure, but the system cannot adequately accommodate large two-dimensional array transmit antennas or antenna arrays with a large number of elements
Solution Approach 1:
The CSI report is divided into multiple segments (first segment containing RI and other CSI parameters, second segment containing additional CSI parameters). This segmentation allows the system to accommodate large antenna arrays by distributing the reporting burden across multiple segments while maintaining manageable complexity in each individual segment.
Solution Approach 2:
The invention introduces a time dimension by transmitting CSI segments across multiple slots. The first segment is transmitted in one slot while the second segment is transmitted in a subsequent slot, transforming the reporting structure from a single-dimension (single slot) to multi-dimension (multiple slots), thereby accommodating larger antenna arrays without overwhelming the reporting channel in a single transmission opportunity.
2Measurement precision
If multiple CSI parameters are reported for large antenna arrays, then the accuracy and reliability of channel quality assessments improve, but the reporting overhead and processing complexity increase
Solution Approach 1:
CSI parameters are segmented into different groups transmitted at different times. The first segment contains RI and other CSI parameters transmitted in one slot, while the second segment contains additional CSI parameters transmitted in a subsequent slot. This reduces the immediate reporting overhead in each slot while maintaining comprehensive channel quality assessment accuracy through the combination of both segments.
Solution Approach 2:
The CSI reporting is structured as a periodic process across multiple slots. By transmitting different segments of CSI parameters in an alternating periodic manner (first segment in one slot, second segment in the next slot), the system distributes the reporting overhead across time while ensuring complete and accurate channel quality assessment through the accumulation of information from multiple periodic transmissions.
3Loss of time
If all CSI parameters are transmitted in one slot, then the reporting is completed quickly, but the complexity of processing and transmitting all parameters simultaneously increases
Solution Approach 1:
The CSI report is segmented into multiple parts transmitted in different slots. The first segment (containing RI and other CSI parameters) is transmitted in one slot, and the second segment (containing additional CSI parameters) is transmitted in a subsequent slot. This segmentation reduces the processing complexity in each individual slot while completing the full reporting process across multiple time units, balancing speed and complexity management.
Data Source
AI summary
For multiplexing channel state information (CSI), a user equipment (UE) includes a transceiver configured to receive configuration information for CSI reporting and a processor configured to decode the configuration information and calculate a CSI according to the configuration information. The transceiver is configured to transmit the calculated CSI on an uplink (UL) channel, where the CSI includes N segments and is transmitted in one slot, where N>1. A first of the N segments includes a rank indicator (RI) and at least one other CSI parameter. A base station (BS) includes a processor configured to generate configuration information for CSI reporting and a transceiver configured to transmit, to a UE, the configuration information via a downlink (DL) channel; and receive, from the UE, a CSI report calculated in accordance with the configuration information on an uplink UL channel.