Base Station and Terminal DCI Size Alignment for Reliable Detection

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Solution Overview

Problem

Existing communication systems face challenges in properly detecting control information due to varying sizes of DCI formats, which can lead to increased error rates in PDCCH and PDSCH channels, particularly in ultra-reliable and low-latency scenarios like URLLC, where high reliability and low latency are required.

Innovation Solution

The solution involves aligning the sizes of DCI formats in a stepwise manner, ensuring that the sizes of different formats match each other, thereby reducing the number of blind detections and minimizing errors in control channel reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple DCI formats with different sizes are used for different search spaces, then the system can support diverse communication requirements (eMBB, mMTC, URLLC), but the terminal cannot properly detect control information and error rates increase

Engineering Contradiction:

Improvesupport for diverse communication requirementsVSAvoidcontrol information detection accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the size parameter of DCI formats by applying padding to make different DCI formats (Format 0_0, 1_0, 0_1, 11) have equal sizes. This parameter adjustment resolves the detection difficulty while maintaining support for multiple communication services.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a standardized DCI format template that is copied and applied across different search spaces. By using the same size and structure for all DCI formats, the terminal can use a unified detection method, improving reliability while maintaining versatility.

Inventive Principle:

Principle #26Copying

2Device complexity

If DCI format sizes are not aligned, then processing is simpler, but blind detection increases and error rates rise

Engineering Contradiction:

ImproveDCI format processing complexityVSAvoidPDCCH and PDSCH error rates

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent uniformly changes the size parameter of all DCI formats to be equal by applying padding where necessary. This standardization reduces blind detection complexity while significantly improving error rates in PDCCH and PDSCH channels.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If DCI format sizes vary, then flexibility in resource allocation is maintained, but the number of blind detections increases

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidblind detection time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent changes the size parameter of DCI formats to be uniform across all types. This reduction in size variation directly decreases the number of blind detections required, saving time while maintaining resource allocation flexibility through other means.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a universal DCI format structure that can serve multiple communication services (eMBB, mMTC, URLLC) through configuration parameters rather than through size variation. This universal structure reduces blind detection time while maintaining adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12432024B2Base station, terminal, and communication method

Publication Date: 2025.09.30 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

A first process (Step 4) of equalizing the sizes of control information between a first format for a first search space and a second format for a second search space and a second process (Procedure B) of equalizing the sizes of control information between a third format and the first format or the second format are carried out in a stepwise manner.