CORESET Precoder Granularity for Multi-UE Control Scheduling

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Solution Overview

Problem

Existing wireless communication technologies face challenges in efficiently scheduling multiple user equipment (UEs) with varying capabilities within a control resource set (CORESET) due to limitations in precoder granularity, leading to suboptimal channel estimation performance and scheduling inefficiencies.

Innovation Solution

Implementing a precoder granularity unit for CORESET that is greater than a resource element group (REG) bundle but less than contiguous resource blocks, allowing for improved channel estimation and scheduling of UEs with reduced capabilities, such as NR-Light UEs, while supporting multiple UEs in a single CORESET.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple TCI states are configured for PDSCH and multiple codepoints of TCI field in DCI are mapped to the multiple TCI states, then the UE can select appropriate TCI states for different scenarios, but the UE cannot determine which TCI state to use for the PDSCH when the DCI includes a TCI field

Engineering Contradiction:

ImproveTCI state selection flexibilityVSAvoidTCI state determination difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent makes the TCI field presence dynamic by conditioning it on the combination of higher layer parameters (numberOfCodepoint, numberOfTCIstates, oneShotActivation). When these parameters satisfy specific conditions, the TCI field is included in DCI; otherwise, it is omitted. This dynamic approach allows the system to adapt between different operational modes (with/without TCI field) based on configuration requirements, resolving the contradiction between flexibility and determinability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter state of the DCI format by conditionally including or excluding the TCI field based on higher layer configuration parameters. When numberOfCodepoint equals 1 and either oneShotActivation is enabled or numberOfTCIstates is 1, the TCI field is excluded from DCI, simplifying the determination process. This parameter-based control resolves the ambiguity by transforming the system state between having TCI field indication and not having it.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If a TCI field is included in DCI to indicate TCI state, then the UE can determine the TCI state for PDSCH, but the DCI format becomes more complex and requires additional bits

Engineering Contradiction:

ImproveTCI state determinationVSAvoidDCI format complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The TCI field is dynamically included or excluded from DCI based on higher layer configuration. When the configuration indicates single codepoint with specific conditions (oneShotActivation enabled or numberOfTCIstates equals 1), the TCI field is omitted, reducing DCI complexity. When multiple codepoints are needed, the TCI field is included to provide explicit indication. This dynamic structure resolves the contradiction by adapting DCI complexity to actual operational needs.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The DCI format is designed to serve multiple functions through conditional inclusion of the TCI field. The same DCI structure can operate in both modes: with TCI field for explicit indication when needed, and without TCI field when the mapping is implicit through other fields. This multi-functional design allows the system to maintain a universal DCI format that adapts to different TCI state indication requirements, resolving the complexity issue.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Device complexity

If the TCI field is excluded from DCI when numberOfCodepoint is 1, then the DCI format is simplified, but the UE cannot distinguish whether the TCI field should be present or not in different DCI formats

Engineering Contradiction:

ImproveDCI format simplicityVSAvoidTCI field presence indication

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The system uses higher layer configuration parameters (numberOfCodepoint, numberOfTCIstates, oneShotActivation) as feedback to determine whether the TCI field should be included in DCI. The UE and gNB both use these pre-configured parameters to consistently determine TCI field presence. This feedback mechanism ensures both sides agree on whether the TCI field is present, eliminating ambiguity while allowing DCI format simplification when appropriate.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The higher layer parameters are configured in advance to establish the rules for TCI field inclusion. Before DCI transmission, the system pre-determines whether the TCI field will be present based on these parameters. This preliminary action ensures that both UE and gNB have consistent understanding of DCI structure before actual transmission, preventing information loss while maintaining simplicity when conditions allow.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4104397B1Control resource set precoding indication

Publication Date: 2026.05.20 QUALCOMM INC

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AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration for a control resource set (CORESET) that indicates a precoder granularity unit over which a same precoding is used for resources of the CORESET. The precoder granularity unit may be greater than a resource element group bundle of the CORESET and less than contiguous resource blocks of the CORESET. The UE may monitor for one or more physical downlink control channel candidates according to the configuration. Numerous other aspects are provided.