Antenna Grouping for Channel State Information Reporting
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel state information (CSI) reporting due to the need for extensive resource usage and power consumption, particularly when estimating channels for data transmission using multiple antennas, as they require all antennas to transmit sounding reference signals (SRS) to determine appropriate precoding.
Innovation Solution
Implementing antenna grouping at user equipment (UE) to reduce resource usage by allowing CSI reporting based on measurements from specific antenna groups, where the base station indicates which antenna group to use for CSI measurement and reporting, thereby conserving power and time resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all antennas transmit sounding reference signals to estimate channel for data transmission, then channel estimation accuracy is improved, but power consumption and time resources increase
Solution Approach 1:
The patent divides the set of antennas into multiple antenna groups, where each group contains a subset of antennas. Instead of having all antennas transmit SRS simultaneously, only one antenna group is activated at a time for channel estimation. This segmentation reduces the number of active antennas and their associated power consumption while maintaining sufficient channel state information through multiple measurements with different groups.
Solution Approach 2:
The patent employs partial action by selecting only a subset of antennas (one antenna group) to transmit SRS for channel estimation, rather than using all available antennas. This partial measurement approach provides sufficient channel state information for precoding decisions while significantly reducing power consumption and resource usage compared to full antenna activation.
2Measurement precision
If all antennas transmit sounding reference signals to estimate channel for data transmission, then channel estimation accuracy is improved, but time resources increase
Solution Approach 1:
The patent segments the antenna set into multiple groups and activates only one group at a time for SRS transmission. This temporal segmentation allows the system to measure channel characteristics from different antenna groups in separate time intervals, reducing the total time required compared to simultaneous measurement from all antennas while maintaining comprehensive channel state information.
Solution Approach 2:
The patent applies partial action by measuring channel state information from only one antenna group at a time rather than all antennas simultaneously. This partial measurement strategy reduces the time resources required for channel estimation while providing sufficient accuracy for precoding through the use of multiple antenna groups across different measurement occasions.
3Measurement precision
If all antennas transmit sounding reference signals to determine precoding, then precoding accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments antennas into groups and configures the UE to measure SRS from only one group at a time. This segmentation simplifies the UE's measurement burden by focusing on a subset of antennas rather than processing data from all antennas simultaneously, reducing computational complexity while maintaining sufficient precoding accuracy through the segmented measurement approach.
Solution Approach 2:
The patent employs partial action by having the UE measure channel state information from only one antenna group at a time for precoding determination, rather than processing measurements from all antennas. This partial measurement approach reduces the complexity of channel estimation and precoding calculations while providing adequate accuracy for effective data transmission.
4Use of energy by moving object
If antenna grouping is used for SRS transmissions to conserve resources, then power and time resources are reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent segments antennas into multiple groups and systematically activates different groups for SRS transmission. By measuring channel characteristics from multiple antenna groups across different time intervals, the system reconstructs comprehensive channel state information that maintains measurement precision equivalent to full antenna measurement, while each individual measurement occasion consumes less power.
Solution Approach 2:
The patent maintains continuous channel estimation capability by sequentially measuring different antenna groups. The UE continuously obtains channel state information from multiple groups over time, ensuring that the measurement process remains effective and comprehensive. This continuous measurement approach prevents precision deterioration by systematically covering all antenna groups rather than using a single static measurement configuration.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques provide for a base station using antenna groups configured at a user equipment (UE) for CSI reporting. The base station may transmit an indication of the antenna group that the UE is to use for measuring and reporting CSI. Based on the received indication, the UE may measure a reference signal transmitted by the base station and received at the UE using one or more antennas of the antenna group in accordance with the indication. The UE may transmit, to the base station, a CSI report that is based on the measuring of the reference signal using the one or more antennas of the antenna group.