Terminal Uplink Control with Dynamic SRI Fields for Multi-TRP

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Solution Overview

Problem

In next-generation mobile communication systems using multi-TRPs, existing Rel. 15/16 specifications limit performance and scheduling flexibility, leading to reduced throughput and degraded communication quality in UL transmission.

Innovation Solution

A terminal that receives DCI based on a specific assumption regarding the size of the SRI field and determines spatial relation information for PUSCH using a CORESET pool index, allowing flexible UL transmission across multiple TRPs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If existing Rel. 15/16 specification is used for multi-TRP transmission, then device complexity is reduced, but UL transmission performance and scheduling flexibility deteriorate

Engineering Contradiction:

Improvespecification complexityVSAvoidUL transmission performance

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent introduces dynamic determination of SRI field size based on CORESET pool index configuration. When multi-TRP operation is enabled and CORESET pool index is configured, the SRI field size is dynamically set to indicate spatial relation information for different TRPs, allowing flexible UL transmission across multiple TRPs while maintaining backward compatibility with existing specifications

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If existing Rel. 15/16 specification is used for multi-TRP transmission, then ease of operation is maintained, but scheduling flexibility and throughput deteriorate

Engineering Contradiction:

Improveoperation simplicityVSAvoidscheduling flexibility

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent changes the parameter of SRI field size from fixed to variable based on CORESET pool index configuration. This parameter change enables the system to adapt to different TRP configurations without requiring complex new procedures, maintaining ease of operation while significantly improving scheduling flexibility for multi-TRP scenarios

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If fixed SRI field size is used in DCI, then device complexity is reduced, but adaptability to multi-TRP scenarios deteriorates

Engineering Contradiction:

Improvecontrol signal complexityVSAvoidmulti-TRP adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent makes the SRI field size dynamic based on CORESET pool index configuration. When multi-TRP operation is enabled and CORESET pool index is configured, the SRI field size increases to accommodate multiple spatial relation information items, enabling proper multi-TRP scheduling while maintaining simple operation for single-TRP cases

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12464539B2Terminal, radio communication method, and base station

Publication Date: 2025.11.04 NTT DOCOMO INC

AI summary

A terminal according to one aspect of the present disclosure includes a receiving section that receives DCI based on a specific assumption regarding a size of a sounding reference signal resource indicator (SRI) field of the DCI scheduling a physical uplink shared channel (PUSCH) when a control resource set (CORESET) pool index is configured to at least one CORESET, and a control section that determines spatial relation information for the PUSCH based on at least one of the SRI field and a CORESET pool index of a CORESET in which the DCI is detected. According to one aspect of the present disclosure, UL transmission can be appropriately controlled even in a case where multi-TRPs are used.