PDCCH Signaling for MUST Interference Cancellation

Solution Overview

Problem

The existing Physical Downlink Control Channel (PDCCH) control signaling in 5G NOMA systems fails to effectively indicate Multi-User Superposition Transmission (MUST) parameters, hindering the performance improvement of MUST systems by not providing necessary information for interference cancellation.

Innovation Solution

A method where a base station acquires and sends indication information to a target terminal, enabling it to cancel interference during data reception through efficient transmission of MUST parameters, reducing overhead and improving interference cancellation performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing PDCCH control signaling is used for MUST parameter indication, then backward compatibility with LTE is maintained, but interference cancellation performance deteriorates due to insufficient information indication

Engineering Contradiction:

Improveinterference cancellation performanceVSAvoidMUST parameter information

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent merges MUST parameter indication with existing PDCCH control signaling by utilizing spare bits in the DCI format. Specifically, it combines the MUST indication with uplink grant or downlink assignment information, allowing multiple pieces of information to be transmitted together in the same control channel resources, thereby improving interference cancellation performance without adding separate signaling overhead.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent makes the PDCCH control signaling multi-functional by enabling it to simultaneously convey both traditional scheduling information and MUST-specific parameters. The DCI format is designed to serve multiple purposes: resource allocation, power control, and MUST parameter indication, thereby eliminating the need for dedicated MUST signaling while maintaining backward compatibility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If separate MUST parameter signaling is added, then interference cancellation performance improves, but signaling overhead increases

Engineering Contradiction:

Improveinterference cancellation performanceVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges MUST parameter indication with existing PDCCH control signaling by utilizing spare bits in the DCI format. Specifically, it combines the MUST indication with uplink grant or downlink assignment information, allowing multiple pieces of information to be transmitted together in the same control channel resources, thereby improving interference cancellation performance without adding separate signaling overhead.

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If PDCCH signaling is modified to include MUST parameters, then MUST system performance improves, but compatibility with existing LTE devices may be affected

Engineering Contradiction:

ImproveMUST system performanceVSAvoidLTE compatibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by making the MUST parameter indication optional and location-specific within the DCI format. Certain bits in the DCI are designated for MUST parameters only when needed, while maintaining the original structure for LTE devices. This allows 5G NR devices to interpret the additional information while LTE devices ignore the optional fields, ensuring backward compatibility.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces dynamic configuration where the presence and interpretation of MUST parameters in PDCCH signaling are adaptable based on the device type and network configuration. The DCI format can dynamically indicate whether MUST parameters are present, allowing the system to switch between LTE-compatible mode and MUST-enhanced mode as needed.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3457780B1Information transmission method and device, and storage medium

Publication Date: 2023.05.10 ZTE CORP

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AI summary

Provided is an information transmission method, including that: a base station acquires indication information for a target terminal and sends the indication information to the target terminal; and the target terminal receives the indication information from the base station, and cancels interference based on the indication information during data reception of multi-user superposition. Also an information transmission device and a storage medium are provided.