Location-Based Uplink Resource Selection for NTN Initial Access

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Solution Overview

Problem

Existing 5G NR technologies face challenges in improving signal reception quality in non-terrestrial networks (NTN) due to varying propagation delays, high Doppler shifts, and low transmission output, especially during initial access, where repetition transmission methods are not adequately controlled.

Innovation Solution

A terminal determines uplink channel resources based on its location to transmit signals, using pre-compensated frequency and timing adjustments, and a base station configures appropriate repetition numbers for uplink channels based on the selected resources, enhancing signal reception quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If repetition transmission is used to improve signal reception quality in NTN, then received signal quality is improved, but transmission time and resource consumption increase

Engineering Contradiction:

Improvereceived signal qualityVSAvoidtransmission time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the repetition number based on terminal location and propagation conditions. Different repetition numbers are configured for different uplink channels (PRACH, PUCCH, PUSCH) according to their specific requirements and the terminal's distance from the gNB, optimizing both signal quality and transmission efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the repetition transmission strategy by channel type and location. Instead of uniform repetition for all transmissions, it divides uplink channels into different categories (random access, control, data) and applies location-specific repetition configurations to each, reducing unnecessary repetitions while ensuring adequate coverage for critical signals.

Inventive Principle:

Principle #1Segmentation

2Reliability

If location-based resource determination is implemented, then signal reception quality is improved, but device complexity increases

Engineering Contradiction:

Improvesignal reception qualityVSAvoidterminal processing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-configuring repetition number tables and location-based parameters before actual transmission. The gNB provides reference signals and configuration information in advance, allowing the terminal to determine appropriate repetition numbers based on its location without complex real-time calculations during transmission.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal uses its own location information (obtained from GNSS or other positioning systems) to self-determine the appropriate repetition number for transmission. This self-service approach eliminates the need for complex network-side calculations and reduces signaling overhead, as the terminal autonomously selects parameters based on pre-configured tables.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260089763A1Terminal, base station, communication method, and integrated circuit

Publication Date: 2026.03.26 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

This terminal comprises: a control circuit that determines the resource of an uplink channel on the basis of information related to the position of the terminal; and a transmission circuit that uses the resource to transmit an uplink channel signal.