MU-MIMO Group User Limit Management via SPR Feedback

Solution Overview

Problem

Multi-user MIMO (MU-MIMO) systems face challenges with high antenna sector power ratio (SPR) leading to increased interference and diminished channel quality, limiting the number of users that can be assigned to an MU-MIMO group, which restricts spectral efficiency and user experience.

Innovation Solution

The system dynamically adjusts the upper limit of users permitted in an MU-MIMO group based on SPR information, reassigning users from single user MIMO to MU-MIMO groups to mitigate noise and interference by modifying the user limit and criteria thresholds, thereby optimizing user experience and performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the number of users assigned to an MU-MIMO group is increased to improve spectral efficiency, then spectral efficiency improves, but interference and noise increase due to high antenna sector power ratio (SPR)

Engineering Contradiction:

Improvespectral efficiencyVSAvoidinterference and noise

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The system dynamically adjusts the upper limit of users permitted in an MU-MIMO group based on real-time SPR measurements. When SPR exceeds a threshold, the system reduces the user limit and reassigns users to single-user MIMO, thereby adapting to changing interference conditions and maintaining optimal spectral efficiency while controlling harmful interference.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system continuously monitors SPR values and uses this feedback to modify MU-MIMO group configurations. Based on the SPR feedback, the system adjusts the number of users in MU-MIMO groups and reassigns users accordingly, creating a closed-loop control system that balances spectral efficiency with interference management.

Inventive Principle:

Principle #23Feedback

2Object-generated harmful factors

If the upper limit of users in an MU-MIMO group is reduced to mitigate interference, then interference and noise are reduced, but spectral efficiency decreases

Engineering Contradiction:

Improveinterference and noiseVSAvoidspectral efficiency

Core Design Contradiction:

Object-generated harmful factorsVSProductivity

Solution Approach 1:

The system dynamically adjusts the upper limit of users permitted in an MU-MIMO group based on real-time SPR measurements. When SPR exceeds a threshold, the system reduces the user limit and reassigns users to single-user MIMO, thereby adapting to changing interference conditions and maintaining optimal spectral efficiency while controlling harmful interference.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the parameter of user limit in MU-MIMO groups based on SPR conditions. By modifying this parameter dynamically, the system optimizes the balance between spectral efficiency and interference management, allowing more users when interference is low and fewer users when interference is high.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If users are reassigned from single user MIMO to MU-MIMO groups to improve spectral efficiency, then spectral efficiency improves, but channel quality deteriorates under high SPR conditions

Engineering Contradiction:

Improvespectral efficiencyVSAvoidchannel quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system continuously monitors SPR values and uses this feedback to modify MU-MIMO group configurations. Based on the SPR feedback, the system adjusts the number of users in MU-MIMO groups and reassigns users accordingly, creating a closed-loop control system that balances spectral efficiency with interference management.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts the upper limit of users permitted in an MU-MIMO group based on real-time SPR measurements. When SPR exceeds a threshold, the system reduces the user limit and reassigns users to single-user MIMO, thereby adapting to changing interference conditions and maintaining optimal spectral efficiency while controlling harmful interference.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11349532B1Utilizing SPR to manage user devices served by MU-MIMO groups

Publication Date: 2022.05.31 T MOBILE INNOVATIONS LLC

AI summary

Systems and methods herein disclose determining anchor assignment for one or more user devices (UEs). The system comprises at least a first node configured to wirelessly communicate with one or more UEs in a geographic service area. The system determines the location of at least one UE within the geographic area. A sector power ratio for the first node is determined to be above a predetermined threshold. Based on this determination, the system modifies an upper limit of the quantity of UEs that are permitted to be assigned to communicate using the MU-MIMO group to a second upper limit. At least one UE previously assigned to a single user MIMO is re-assigned to the MU-MIMO such that the second upper limit of the MU-MIMO group is not exceeded.