NB-IoT Satellite Carrier Aggregation for High Data Rates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current narrowband Internet of Things (NB-IoT) over satellite systems face limitations in data rate and spectrum efficiency due to the requirement of minimum 1.4 MHz spectrum allocation and insufficient power/antenna performance, which restricts the deployment of low-power, low-cost devices, and lack support for features like user terminal mobility and high data rate schemes.
Innovation Solution
The implementation of carrier aggregation and higher-order modulation schemes such as 16-ary and 64-ary modulations in NB-IoT over satellite systems, allowing for dynamic addition/deletion of carriers and enhanced multicarrier semipersistent scheduling, to increase per-terminal data rates and support a wider range of services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If NB-IoT operates on 200 kHz carriers with limited bandwidth, then low-power and low-cost devices can be supported, but data rate is limited to tens of kbps
Solution Approach 1:
The patent combines multiple 200 kHz NB-IoT carriers through carrier aggregation to achieve higher data rates. By aggregating multiple narrowband carriers, the system achieves broadband data rates (several Mbps) while individual carriers maintain their low-power characteristics, allowing low-power devices to access high data rate services.
Solution Approach 2:
The patent introduces dynamic carrier aggregation where the number of aggregated carriers can be flexibly adjusted based on service requirements. The system can dynamically add or release carriers to match traffic demands, enabling low-power devices to transition between power-saving mode (single carrier) and high data rate mode (multiple carriers aggregated).
2Reliability
If minimum 1.4 MHz spectrum is allocated per satellite beam, then sufficient bandwidth for NR/LTE is provided, but spectrum resources are wasted when lower data rates are sufficient
Solution Approach 1:
The patent segments the 1.4 MHz satellite spectrum into multiple 200 kHz NB-IoT carriers. This segmentation allows flexible allocation where only the necessary number of carriers are activated based on actual traffic demands, reducing spectrum waste while maintaining connection reliability for satellite users.
Solution Approach 2:
The patent changes the spectral efficiency parameter by using higher-order modulations (16-ary and 64-ary QAM) in addition to traditional BPSK/QPSK. This allows the system to achieve higher data rates within the same spectrum allocation, reducing the total spectrum resources needed while maintaining reliable connections.
3Reliability
If traditional NB-IoT modulation schemes (BPSK, QPSK) are used, then robustness for low-power devices is achieved, but data rate is limited
Solution Approach 1:
The patent changes the modulation order parameter from traditional low-order modulations (BPSK, QPSK) to higher-order modulations (16-ary QAM, 64-ary QAM). This parameter change enables significantly higher data rates while maintaining robustness through adaptive modulation and coding schemes that can switch between modulation orders based on channel conditions.
4Ease of manufacture
If NB-IoT supports only a large number of low-power devices, then cost-effective IoT deployment is achieved, but mobility and voice services are not supported
Solution Approach 1:
The patent makes the NB-IoT system universal by enabling it to support multiple service types including IoT devices, mobile users, voice services, and high data rate applications. Through carrier aggregation and higher-order modulations, a single NB-IoT infrastructure can serve diverse service requirements, from low-power sensor devices to mobile voice and data services.
Solution Approach 2:
The patent introduces dynamic resource allocation and mobility support mechanisms that allow the system to adapt to different user scenarios. Low-power devices can use single-carrier mode for cost-effective deployment, while mobile users can dynamically access multiple aggregated carriers for voice and data services, all within the same NB-IoT network infrastructure.
Data Source
AI summary
A satellite communication system includes a satellite, satellite base station (eNodeB or gNodeB) and a user equipment (UE). The satellite provides a number of satellite beams, and each satellite beam includes multiple cells. The base station communicates with the UE via a satellite using a narrowband internet of things (NB-IoT) waveform and an enhanced protocol. In particular, the base station and UE perform carrier aggregation by adding and/or deleting carriers in a cell, and the base station and UE perform a higher-order modulation and coding scheme (MCS) processing to support high data rates for user data transport.