NTN Handover for Small Data Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling uplink data transmissions, particularly in non-terrestrial networks where frequent cell changes occur due to the movement of satellites or devices, leading to inefficient data retransmissions and interruptions.
Innovation Solution
A method is introduced where a communications device determines the need to switch cells based on position changes and receives a status report message from the new cell to continue uplink data transmission, allowing it to resume transmission from where it left off without restarting the entire data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent cell changes occur in non-terrestrial networks due to satellite movement, then coverage availability is improved, but data transmission efficiency deteriorates due to complete retransmissions
Solution Approach 1:
The network performs preliminary actions by establishing and maintaining a status report mechanism that tracks transmitted data portions before cell changes occur. The target cell receives advance information about which data portions were successfully transmitted to the source cell, enabling it to prepare appropriate reconfiguration messages that allow the UE to resume transmission from the correct position without restarting the entire data transfer.
2Reliability
If the UE retransmits complete data after cell change, then transmission reliability is maintained, but time loss increases due to redundant retransmission
Solution Approach 1:
The source cell provides feedback information to the target cell through status report messages that indicate which data portions were successfully transmitted. This feedback mechanism allows the target cell to send reconfiguration messages containing the correct resume indication and data portion information, enabling the UE to resume transmission from the correct position without time-consuming complete retransmissions.
3Stability of the object's composition
If the network implements comprehensive status tracking, then data transmission continuity is improved, but device complexity increases
Solution Approach 1:
The network utilizes existing multi-functional elements already present in the system. Base stations and core network elements perform multiple functions including status reporting, handover management, and data tracking using their existing resources. This approach achieves data transmission continuity without requiring dedicated complex new infrastructure, as existing network elements are made multi-functional to handle the additional tracking requirements.
Data Source
AI summary
A method of operating a communications device for transmitting signals to and/or receiving signals from a wireless communications network is provided. The method comprises determining that the communications device has uplink data to transmit to the wireless communications network, transmitting to a first cell of the wireless communications network, while the communications device is located within a coverage region of the first cell, one or more of a plurality of portions of the uplink data, determining, as a result of a change in a relative position of the communications device with respect to the coverage region of the first cell, that the communications device should select a different cell to continue the transmission of the uplink data, selecting a second cell of the wireless communications network, and receiving, from the second cell, a reconfiguration message.