User Terminal Beam Selection for Interference Control

Solution Overview

Problem

In future radio communication systems like NR, allowing user equipment (UE) to autonomously select beams can lead to interference with other UEs and cells, resulting in deteriorated communication quality and throughput.

Innovation Solution

A user terminal equipped with a receiving section for determining information and a control section that selects a transmitting beam based on predetermined criteria, such as RSRP or SINR, to minimize interference and optimize beam selection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If UE autonomously selects beams, then beam selection flexibility and adaptability are improved, but interference to other UEs and cells increases, deteriorating communication quality and throughput

Engineering Contradiction:

Improvebeam selection flexibilityVSAvoidinterference to other UEs and cells

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The base station provides determining information that includes feedback mechanisms to guide UE beam selection. The UE measures downlink reference signals and uses the determining information to select beams that satisfy predetermined conditions, creating a feedback loop where the base station's guidance influences UE autonomous selection to reduce interference while maintaining flexibility.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The determining information includes parameters such as reference signal received power (RSRP) thresholds and beam selection criteria that can be dynamically adjusted. By changing these parameters based on network conditions, the system optimizes the balance between UE selection freedom and interference control.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If UE autonomously selects beams, then communication adaptability is improved, but communication throughput deteriorates

Engineering Contradiction:

Improvecommunication adaptabilityVSAvoidcommunication throughput

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The base station provides determining information that includes feedback mechanisms to guide UE beam selection. The UE measures downlink reference signals and uses the determining information to select beams that satisfy predetermined conditions, creating a feedback loop where the base station's guidance influences UE autonomous selection to reduce interference while maintaining flexibility.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The base station performs preliminary actions by providing determining information in advance that includes beam selection criteria and reference signal configuration. This preliminary guidance enables the UE to make informed autonomous selections without needing real-time base station commands, maintaining throughput while improving adaptability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11122544B2User terminal and radio communication method

Publication Date: 2021.09.14 NTT DOCOMO INC

AI summary

A terminal is disclosed including a processor and a transmitter. The processor determines, based on a threshold of a criterion, a beam having the criterion that is equal to or greater than the threshold. Further, the transmitter transmits a random access preamble based on the determined beam. In other aspects, a radio communication method for a terminal is also disclosed.