PDCCH Candidate Combination for 5G Reliability

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Solution Overview

Problem

Current wireless communication systems in 5G face challenges in efficiently managing and decoding physical downlink control channel (PDCCH) candidates, particularly in handling repetitions and combined candidates across multiple search space sets, which affects reliability and power consumption.

Innovation Solution

The described techniques involve configuring communication devices (UEs) to combine PDCCH candidates from different search space sets into a combined PDCCH candidate, allowing for monitoring and decoding based on specific thresholds and resource allocations, thereby enhancing flexibility and reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PDCCH candidates are monitored in multiple search space sets, then reliability of control information reception is improved, but device complexity and power consumption increase

Engineering Contradiction:

Improvereliability of control information receptionVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines PDCCH candidates from multiple search space sets into a unified set of candidates. The UE monitors PDCCH candidates across multiple search space sets (common and UE-specific) and combines them into a single monitoring set, reducing the complexity of managing separate monitoring procedures while maintaining comprehensive coverage for reliable control information reception.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a universal PDCCH candidate set that serves multiple functions: it includes candidates from both common search space sets (for system-wide control information) and UE-specific search space sets (for dedicated control information). This unified approach allows the UE to monitor all relevant PDCCH candidates through a single standardized procedure, improving reliability without proportionally increasing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If PDCCH candidates are monitored in multiple search space sets, then reliability of control information reception is improved, but power consumption increases

Engineering Contradiction:

Improvereliability of control information receptionVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

By merging PDCCH candidate monitoring from multiple search space sets into a unified procedure, the UE avoids duplicative monitoring operations. The combined candidate set eliminates redundant blind decoding attempts while ensuring all necessary control information is captured, thereby improving reliability without linearly increasing power consumption.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies partial monitoring by allowing the UE to monitor a combined set of PDCCH candidates that includes essential candidates from multiple search space sets without requiring monitoring of every possible candidate. This selective approach ensures reliable reception of critical control information while limiting power consumption by avoiding excessive monitoring of low-priority candidates.

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If combined PDCCH candidate is assigned to set of PDCCH candidates, then flexibility in control information management is improved, but complexity of candidate management increases

Engineering Contradiction:

Improveflexibility in control information managementVSAvoidcomplexity of candidate management

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges PDCCH candidates from different search space sets into a combined candidate set that is then assigned to a unified monitoring structure. This combining approach provides flexibility in managing control information from multiple sources while using a standardized assignment procedure that prevents exponential growth in management complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent segments the PDCCH candidate management into distinct components: common search space set candidates, UE-specific search space set candidates, and the final combined candidate set. This segmentation allows flexible inclusion/exclusion of different candidate types based on configuration while maintaining organized, manageable structures through clear separation of candidate sources and combination rules.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250071735A1Physical downlink control channel candidates related to physical downlink control channel repetitions

Publication Date: 2025.02.27 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise known as user equipment (UE) may support repetition of physical downlink control channels (PDCCH) and handling a combined PDCCH candidate associated with multiple search space sets. For example, a UE may combine a first PDCCH candidate corresponding to a first search space set and a second PDCCH candidate corresponding to a second search space set to form a combined PDCCH candidate. The UE may decode the combined PDCCH candidate based on one or more factors, for example, such as a blind decoding PDCCH candidate threshold. As a result, the UE may decode the combined PDCCH candidate in addition to decoding of individual PDCCH candidates, thereby providing increased flexibility for downlink control information (DCI) and improving the reliability of PDCCH.