UE Cooperative MIMO Uplink Path Control and Partner Selection

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Solution Overview

Problem

Existing radio communication systems lack comprehensive control mechanisms for utilizing antenna/antenna ports of multiple UEs in cooperative MIMO configurations, including selection of partner UEs, data transfer paths, synchronization, data sharing, and scheduling in UE cooperative MIMO.

Innovation Solution

A terminal equipped with a receiving section and control section that determines transmission methods and schedules UL data using information related to transmission paths and downlink control, enabling coordinated communication with other UEs through higher layer signaling and DCI.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If UE cooperative MIMO is implemented to enhance throughput and capacity, then data transmission rate improves, but control complexity increases due to lack of standardized mechanisms for selecting terminals and determining transfer paths

Engineering Contradiction:

ImprovethroughputVSAvoidcontrol complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The base station performs preliminary actions by configuring candidate UEs and their associated antenna ports in advance through higher layer signaling. This pre-configuration allows the terminal to determine transmission methods based on pre-established paths, reducing real-time control complexity while maintaining high throughput capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where the base station provides downlink control information based on channel state information reported by UEs. This feedback loop enables dynamic selection of transmission paths and methods, optimizing throughput while managing control complexity through automated decision-making

Inventive Principle:

Principle #23Feedback

2Productivity

If multiple UEs are used for UL transmission to increase capacity, then spectral efficiency improves, but difficulty in detecting and measuring appropriate transmission paths increases

Engineering Contradiction:

ImprovecapacityVSAvoidtransmission path detection

Core Design Contradiction:

ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The base station acts as an intermediary that receives channel state information from multiple UEs and determines the optimal transmission paths. This intermediary role simplifies the detection process for individual UEs, as they只需 report channel conditions rather than independently analyzing complex multi-UE transmission paths

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system replaces complex mechanical/physical path detection mechanisms with information-based decision-making. Instead of physically measuring all possible transmission paths, UEs report channel state information and the base station uses this information to determine optimal paths through computational algorithms

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12634926B2Terminal, radio communication method, and base station

Publication Date: 2026.05.19 NTT DOCOMO INC

AI summary

A terminal according to one aspect of the present disclosure includes a receiving section that receives information related to a transmission path for at least a part of UL data; and a control section that determines at least one of a transmission method of the UL data and a second terminal other than the terminal, the second terminal being notified of at least the part of the UL data, based on at least one of the information related to the transmission path and downlink control information used for scheduling of the UL data.