MU-MIMO Downlink Reception Using Shared Modulation Order Info

Solution Overview

Problem

In multi-user multiple-input multiple-output (MU-MIMO) scenarios, the maximum likelihood (ML) receiver experiences high algorithm complexity and UE power consumption due to the need for blind detection of modulation orders for interference layers.

Innovation Solution

A communication method where a network device provides modulation order information to a first terminal, allowing it to receive downlink data based on this information rather than performing blind detection on all possible modulation orders, thereby reducing complexity and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If blind detection on all modulation orders is performed to receive downlink data, then modulation order detection accuracy is improved, but algorithm complexity increases and power consumption increases

Engineering Contradiction:

Improvemodulation order detection accuracyVSAvoidalgorithm complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The network device performs preliminary action by determining the modulation order of the second terminal before the first terminal performs detection. This preliminary determination allows the first terminal to receive downlink data directly using the provided modulation order information without performing blind detection on all possible modulation orders, thereby reducing algorithm complexity while maintaining detection accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network device acts as an intermediary by providing modulation order information to the first terminal. This intermediary approach transfers the complex detection task from the terminal to the network device, which has more processing capabilities. The first terminal simply uses the provided modulation order information to receive data, significantly reducing its algorithm complexity and power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If blind detection on all modulation orders is performed to receive downlink data, then modulation order detection accuracy is improved, but power consumption increases

Engineering Contradiction:

Improvemodulation order detection accuracyVSAvoidUE power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The network device performs preliminary action by determining the modulation order of the second terminal before the first terminal performs detection. This preliminary determination allows the first terminal to receive downlink data directly using the provided modulation order information without performing blind detection on all possible modulation orders, thereby reducing algorithm complexity while maintaining detection accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The network device acts as an intermediary by providing modulation order information to the first terminal. This intermediary approach transfers the complex detection task from the terminal to the network device, which has more processing capabilities. The first terminal simply uses the provided modulation order information to receive data, significantly reducing its algorithm complexity and power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If modulation order information is provided by network device, then algorithm complexity is reduced, but signaling overhead increases

Engineering Contradiction:

Improvealgorithm complexityVSAvoidsignaling overhead

Core Design Contradiction:

Device complexityVSQuantity of substance

Solution Approach 1:

The patent changes the parameter representation by providing modulation order information in a compact form. Instead of transmitting full modulation order details for all terminals, the network device provides specific modulation order information that indicates the relationship between first and second terminal modulation orders. This parameter change reduces the amount of signaling overhead while still enabling the first terminal to determine the required modulation order for receiving downlink data.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250380267A1Communication method and apparatus

Publication Date: 2025.12.11 HUAWEI TECH CO LTD

AI summary

This application discloses a communication method and apparatus, and relates to the communication field. The communication method includes: A first terminal receives first information that is from a network device and that indicates modulation order information for data transmission of a second terminal, and receives downlink data based on the modulation order information for the data transmission of the second terminal.