Satellite MO Data Buffering for NTN Power-Saving Reliability
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Solution Overview
Problem
In Non-Terrestrial Network (NTN) communication systems, the store-and-forward mode results in terminals needing to continuously monitor downlink channels for delivery confirmation of Mobile Originated (MO) data, which is inefficient for power saving and reliability.
Innovation Solution
A terminal device buffers MO data upon receiving indication from a satellite that it has successfully received the data, and clears the buffer when delivery to the core network is confirmed or the data is deemed invalid, allowing power-saving without continuous channel monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal continuously monitors downlink channels for delivery confirmation, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The terminal device performs discontinuous reception (DRX) by alternating between active monitoring periods and sleep periods. During active periods, the terminal monitors downlink channels for delivery confirmation; during sleep periods, the terminal stops monitoring to save power. This periodic action resolves the contradiction by providing reliability during monitoring phases while reducing power consumption during sleep phases.
2Use of energy by moving object
If the terminal buffers MO data after successful reception by satellite, then power saving is improved, but data delivery reliability may worsen
Solution Approach 1:
The terminal device receives feedback information from the network indicating whether the buffered MO data has been successfully delivered to the core network. Based on this feedback, the terminal determines whether to clear the buffer or continue buffering. This feedback mechanism ensures data delivery reliability while allowing power-saving buffering behavior, as the terminal only maintains buffers when necessary and clears them upon successful delivery confirmation.
Data Source
AI summary
A wireless communication method and a terminal device are provided. The method includes: a terminal device receiving first indication information, which is used for determining that a first satellite successfully receives mobile-originated (MO) data sent by the terminal device, wherein the MO data is transmitted by using a storage and forwarding mode of the first satellite; and the terminal device caching the MO data, wherein the cached MO data is cleared away in the following cases: the terminal device determining that the MO data is successfully submitted to a core network and/or the cached MO data is invalid.