MU-MIMO Terminal Grouping for CSI Reporting Optimization

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing MU-MIMO wireless communication systems face challenges in managing uplink traffic and power consumption due to the need for frequent channel state information reporting from a large number of terminals to the base station, which limits the number of spatial multiplexes and reduces frequency utilization efficiency.

Innovation Solution

A base station and terminal system that selectively determines which terminals report channel state information and perform spatial multiplex communication, allowing only a subset of terminals to measure and report CSI at each data transmission cycle, thereby reducing unnecessary traffic and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If all connected terminals report channel state information at every data transmission cycle, then the base station can select the optimal combination of terminals for spatial multiplex communication, but the uplink traffic and power consumption increase enormously

Engineering Contradiction:

Improvefrequency utilization efficiencyVSAvoiduplink traffic

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent divides the set of all connected terminals into multiple groups, where only one group reports channel state information at each data transmission cycle. This segmentation reduces the number of terminals reporting simultaneously, thereby decreasing uplink traffic while still enabling optimal terminal selection for spatial multiplex communication within each group.

Inventive Principle:

Principle #1Segmentation

2Productivity

Engineering Contradiction:

Improvefrequency utilization efficiencyVSAvoidpower consumption at terminals

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent segments terminals into multiple groups and assigns different reporting cycles to different groups. Only terminals in the active group report channel state information at each cycle, reducing the number of active transmissions and thereby lowering overall power consumption at terminals while maintaining the ability to select optimal terminals for communication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements periodic channel state information reporting where terminals alternate between reporting and non-reporting cycles. By organizing terminals into groups that report in different periods, the system reduces the frequency of reporting operations at each terminal, thereby reducing power consumption while still gathering sufficient channel state information for optimal terminal selection.

Inventive Principle:

Principle #19Periodic action

3Adaptability or versatility

If the base station switches the data transmission target at every data transmission cycle to serve more terminals, then more terminals can be supported, but the system complexity and overhead increase

Engineering Contradiction:

Improvenumber of supported terminalsVSAvoidsystem overhead

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent divides terminals into multiple groups and maintains different channel state information reporting schedules for each group. This segmentation allows the base station to manage multiple groups with different active terminals, effectively supporting more terminals simultaneously while reducing the overhead of managing channel state information for all terminals uniformly.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10715224B2Terminal, base station, wireless communication system and channel state information acquisition method

Publication Date: 2020.07.14 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A base station is capable of wireless communication with a plurality of terminals, the base station includes a memory that holds information on P (P: an integer of 3 or more) terminals currently connected to the base station, a determination unit that determines L (L: an integer satisfying 2≤L<P) terminals that are to report channel state information indicating a state of a propagation path to the base station from among the P terminals based on the information on the P terminals, at every data transmission cycle, a selector that selects M (M: an integer satisfying 2≤M≤L) terminals capable of spatial multiplex communication in the data transmission cycle based on the reporting of the channel state information from the L terminals, and a communicator that transmits data to and from the M terminals via a plurality of antennas using the spatial multiplex communication.