Store and Forward Satellite Data Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges such as signal attenuation and blockage in complex and dynamic environments, leading to issues like reduced data carrying capacity, increased power consumption, and unreliable communications.
Innovation Solution
The method involves a user equipment (UE) receiving information about non-terrestrial network (NTN) entities capable of storing UE data, selecting an appropriate NTN entity, and transmitting uplink data to it. The NTN entity then stores the data until it has connectivity with a ground station, where the data is forwarded, and a downlink response is sent back to the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If store and forward operation is implemented in satellites, then communication reliability is improved in discontinuous coverage areas, but device complexity increases
Solution Approach 1:
The satellite performs preliminary data storage before ground contact is available. The UE transmits uplink data to the satellite in advance, which stores it in its memory buffer. This preliminary action ensures data is ready for forwarding when the satellite establishes connectivity with the ground station, eliminating the need for retransmission and improving communication reliability in discontinuous coverage areas.
Solution Approach 2:
The satellite acts as an intermediary between the UE and the ground station. It receives uplink data from the UE, stores it temporarily, and then forwards it to the ground station when connectivity is available. This intermediary role allows communication to proceed even when direct UE-ground station connection is not available, improving reliability while managing complexity through standardized store-and-forward protocols.
2Quantity of substance
If data is stored in satellites for later forwarding, then data carrying capacity is improved, but loss of time increases due to storage duration
Solution Approach 1:
The satellite's data storage and forwarding operation is dynamic rather than static. The satellite continuously monitors its buffer status and ground connectivity, dynamically adjusting when to store data and when to forward it. This dynamic operation allows the satellite to minimize storage duration by forwarding data as soon as ground connectivity is available, reducing time loss while maximizing data carrying capacity through efficient buffer utilization.
Solution Approach 2:
The system changes operational parameters based on real-time conditions. When ground connectivity is available, the satellite changes from storage mode to forwarding mode, reducing the storage duration parameter. This parameter change optimizes the balance between data carrying capacity (by utilizing available buffer space) and time loss (by minimizing storage duration through timely forwarding).
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for data transmission in a store and forward non-terrestrial network (NTN). A method for wireless communication by a user equipment (UE), the method includes obtaining information of one or more NTN entities configured to store UE data. The method includes selecting one of the one or more NTN entities based on the information. The method includes outputting uplink data to the NTN entity.