NB-IoT NTN Cell Acquisition with TDD Frame Repetition
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Solution Overview
Problem
Existing NTN systems face challenges in integrating Narrowband-Internet of Things (NB-IoT) due to large timing offsets and incompatibility with existing large-granularity TDD systems, which affect initial access and cell acquisition.
Innovation Solution
A custom-designed signal mapping approach is implemented to determine a TDD frame repetition unit spanning multiple radio frames, allowing for monitoring and communication with NTN cells for NB-IoT, facilitating initial access and cell acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing large-granularity TDD systems are used for NTN, then system compatibility is maintained, but NB-IoT integration fails due to large timing offsets
Solution Approach 1:
The patent segments the TDD frame structure into smaller, more flexible units with refined timing relationships. By dividing the large-granularity TDD frame into sub-frames with precise timing offsets, the system can accommodate NB-IoT requirements while maintaining NTN operation, thus resolving the contradiction between system compatibility and NB-IoT integration.
Solution Approach 2:
The patent changes critical timing parameters of the TDD frame structure, including sub-frame durations, slot configurations, and timing advance values. These parameter adjustments enable the system to reduce large timing offsets that prevent NB-IoT integration, while preserving overall system compatibility through controlled modifications.
2Adaptability or versatility
If TDD frame structure is refined for NB-IoT, then NB-IoT operation is enabled, but system complexity increases
Solution Approach 1:
The patent introduces dynamic configuration mechanisms where TDD frame parameters can be adjusted based on operational requirements. Through dynamic slot allocation and flexible timing configurations, the system enables NB-IoT support without permanently increasing structural complexity, as the complexity is managed through controllable parameter variations rather than fixed structural changes.
3Ease of operation
If large timing offsets are maintained for NTN, then satellite communication is simplified, but cell acquisition fails for NB-IoT
Solution Approach 1:
The patent applies preliminary timing adjustments and synchronization procedures before NB-IoT cell acquisition attempts. By pre-configuring timing relationships and performing initial synchronization with adjusted parameters, the system prepares the communication channel to accommodate both NTN characteristics and NB-IoT requirements, ensuring successful cell acquisition without compromising satellite communication simplicity.
Data Source
AI summary
The apparatus may be a wireless device configured to determine a time division duplex (TDD) frame repetition unit for a non-terrestrial network (NTN) cell, wherein the TDD frame repetition unit specifies a TDD frame structure spanning multiple radio frames within a repetition period, monitor, based on the TDD frame repetition unit, at least one signal, of a set of signals, associated with cell acquisition for Narrowband-Internet of Things (NB-IoT) over the NTN cell, and communicate with the NTN cell based on the at least one monitored signal associated with the cell acquisition.