FDM Beam Configuration for NTN Inter-Beam Interference

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Solution Overview

Problem

In non-terrestrial networks, particularly in satellite communication systems, the long round trip time and limited transmission throughput due to high satellite altitude lead to inter-beam interference and increased latency, which hampers communication performance and reliability, especially in unlicensed spectrum usage where devices face challenges in channel access and beam separation.

Innovation Solution

Implementing a method for user equipment (UE) and base stations to operate in multiple frequency bands, enabling frequency division multiplexed (FDM) beams, which reduces inter-beam interference and enhances communication performance and reliability by configuring radio resource control (RRC) procedures and beam configurations to manage channel access and transmission effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If beamformed transmission is used to extend coverage in NTN, then coverage area is improved, but inter-beam interference increases

Engineering Contradiction:

Improvecoverage areaVSAvoidinter-beam interference

Core Design Contradiction:

Area of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent segments the frequency spectrum into multiple frequency bands and assigns different beams to different frequency bands. This frequency division multiplexing approach allows multiple beams to operate simultaneously without interfering with each other, thus maintaining extended coverage while eliminating inter-beam interference.

Inventive Principle:

Principle #1Segmentation

2Reliability

If LBT procedure is implemented for channel access in unlicensed spectrum, then fair spectrum sharing is improved, but transmission latency increases

Engineering Contradiction:

Improvefair spectrum sharingVSAvoidtransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent changes the channel access parameter by allowing configured grants for uplink transmissions without requiring LBT procedure. This parameter change from LBT-based access to configured grant-based access reduces transmission latency while maintaining fair spectrum sharing through proper resource configuration.

Inventive Principle:

Principle #35Parameter changes

3Length of stationary object

If long RTT is accommodated in NTN communication, then satellite altitude coverage is improved, but transmission throughput decreases

Engineering Contradiction:

Improvesatellite altitudeVSAvoidtransmission throughput

Core Design Contradiction:

Length of stationary objectVSProductivity

Solution Approach 1:

The patent implements preliminary action by configuring uplink grants in advance before the actual transmission is needed. This allows the UE to transmit data immediately when data arrives without waiting for scheduling requests and grants, thereby compensating for the long RTT and improving transmission throughput while maintaining high satellite altitude coverage.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230262672A1Method of wireless communication, base station and user equipment

Publication Date: 2023.08.17 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A method of wireless communication, a base station and user equipment are provided. The method by a user equipment (UE) includes being configured, by a base station, with a first frequency band and/or a second frequency band for a serving cell and performing transmission and/or reception in the first frequency band and/or the second frequency band.