Uplink Transmission Timing for Large-Delay NTN Cells

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Solution Overview

Problem

Next generation telecommunication systems with large cell sizes, such as NTN systems, face significant transmission delays and variability, which complicate data transmission procedures and require enhancements to accommodate these delays.

Innovation Solution

The use of assisting information, such as offset tables, scaling factors, and timing advance adjustments, is implemented to calculate accurate transmission times for uplink data, along with strategies like disabling HARQ feedback and configuring random access resources to mitigate delay issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If larger cell sizes are used in NTN systems, then communication coverage is improved, but transmission delay increases significantly

Engineering Contradiction:

Improvecell coverage areaVSAvoidtransmission delay

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

The network device performs preliminary calculations of the time interval between downlink and uplink transmissions based on satellite orbital parameters and device location information before actual communication occurs. This advance preparation allows the system to compensate for propagation delays without real-time computation, resolving the contradiction between large cell coverage and transmission delay.

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If satellite systems with large cell sizes are deployed, then telecommunication service coverage is expanded, but variability of transmission delays increases

Engineering Contradiction:

Improveservice coverage areaVSAvoidtransmission delay variability

Core Design Contradiction:

Area of stationary objectVSStability of the object's composition

Solution Approach 1:

The system obtains actual location information of the communication device and uses it to dynamically adjust and refine the time interval calculations. This feedback mechanism compensates for delay variability caused by different device positions within the large cell, maintaining stable transmission timing across the expanded service area.

Inventive Principle:

Principle #23Feedback

3Device complexity

If conventional data transmission procedures are used in large cell sizes, then system simplicity is maintained, but transmission reliability deteriorates due to significant delays

Engineering Contradiction:

Improvetransmission procedure complexityVSAvoiddata transmission reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system modifies key transmission parameters including the time interval between downlink and uplink transmissions, and adjusts HARQ feedback timing based on calculated propagation delays. These parameter changes ensure reliable data transmission in large cells without requiring completely new transmission procedures, balancing reliability improvement with system simplicity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12501421B2Method to schedule data transmission

Publication Date: 2025.12.16 ZTE CORP

AI summary

Method, systems and devices for data transmission in a cell having large transmission delay. In particular embodiments, assisting information may be sent from a network device to a communication device. The assisting information may be used to calculate a timing offset to determine a correct transmission time to compensate for propagation delay in large cell with significant propagation delay.