DMRS Port Group Segmentation for MIMO Interference Reduction

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Solution Overview

Problem

In MIMO communication systems, inter-layer interference between data flows sent through different DMRS port groups is severe due to the inability to perform joint precoding, making it challenging for terminal devices to independently decode data flows mapped to different transport layers.

Innovation Solution

A data communication method where a network device divides a transport block into code block groups corresponding to DMRS port groups, allowing each group to be mapped to a specific transport layer, enabling independent decoding and supporting interference cancellation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple DMRS port groups are used for MIMO communication, then system channel capacity is increased, but inter-layer interference between data flows becomes severe

Engineering Contradiction:

Improvesystem channel capacityVSAvoidinter-layer interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The transport block is segmented into multiple code block groups (CBGs), where each CBG is associated with a specific DMRS port group. This segmentation allows the terminal device to independently decode each CBG corresponding to different DMRS port groups, thereby enabling interference cancellation for multiple data flows while maintaining high system channel capacity

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If joint precoding is performed on DMRS ports in different groups, then inter-layer interference is reduced, but the precondition of independent decoding cannot be met

Engineering Contradiction:

Improveinter-layer interferenceVSAvoidindependent decoding capability

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent segments the transport block into multiple CBGs, each mapped to a specific DMRS port group, ensuring that each CBG can be independently decoded. Simultaneously, it applies joint precoding across these segmented CBGs to reduce inter-layer interference, thus resolving the contradiction between independent decoding and interference reduction

Inventive Principle:

Principle #1Segmentation

3Object-affected harmful factors

If interference cancellation receiver is added to terminal device, then inter-layer interference is reduced, but device complexity increases

Engineering Contradiction:

Improveinter-layer interferenceVSAvoidterminal device complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent reduces terminal device complexity by segmenting the transport block into CBGs that can be independently decoded. This segmentation structure enables the interference cancellation receiver to process each CBG separately, simplifying the overall interference cancellation process while still achieving effective inter-layer interference reduction

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11038644B2Data communication method, network device, and terminal device

Publication Date: 2021.06.15 HUAWEI TECH CO LTD

AI summary

Embodiments of this application provide a data transmission method, a network device, and a terminal device. The method includes: determining, by a network device, demodulation reference signal DMRS port groups, where a quantity of the DMRS port groups is greater than or equal to 2; and further, communicating, by the network device, data with a terminal device, where the data is corresponding to a transport block, the transport block is divided into at least one code block group CBG, and each of the at least one CBG is corresponding to one DMRS port group and is mapped to a transport layer corresponding to the one DMRS port group.