NB-IoT Channel Configuration for Unlicensed Spectrum Hopping
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Solution Overview
Problem
The challenge in the Internet of Things (IoT) is to effectively manage frequency hopping in unlicensed spectrum for Narrowband Internet of Things (NB-IoT) systems, particularly in regions like the US, where frequency hopping is required to ensure that nodeB and user equipment can transmit and receive data on the same channel, while adhering to regulatory limitations such as duty cycle and transmission power constraints.
Innovation Solution
The solution involves configuring orthogonal channel division and downlink/uplink (DL/UL) configurations within the NB-IoT systems, using techniques like bitmap indications and channel whitelisting to manage frequency hopping, allowing for efficient channel selection and data transmission across multiple channels, and supporting multiple DL/UL switches to accommodate varying regional requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is implemented in NB-IoT systems operating in unlicensed spectrum, then compliance with regional regulations is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring frequency hopping parameters and channel whitelist information in system broadcast messages before actual data transmission. This allows UEs to autonomously determine hopping patterns without requiring dynamic signaling during transmission, thus ensuring regulatory compliance while minimizing real-time signaling overhead.
Solution Approach 2:
The patent introduces channel whitelist information as an intermediary element that mediates between regulatory requirements and system operation. The whitelist pre-approves valid channels for hopping, enabling the system to comply with regional regulations (e.g., duty cycle limits, power constraints) while maintaining controlled and predictable hopping behavior without excessive signaling complexity.
2Productivity
If channel whitelist information and bitmap indications are used to manage frequency hopping, then channel selection efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent segments channel information management into two parts: (1) channel whitelist information that defines the set of valid channels for hopping, and (2) bitmap indications that efficiently represent channel availability and hopping patterns. This segmentation allows efficient channel selection through structured data representation while minimizing the actual signaling overhead by using compact bitmap formats rather than explicit channel lists.
Solution Approach 2:
The patent employs parameter changes by using variable-length bitmap indications that adapt to the specific channel configuration. The bitmap size and structure are optimized based on the number of channels in the whitelist, allowing efficient representation of channel selection information with minimal signaling overhead while maintaining high channel selection efficiency.
3Adaptability or versatility
If multiple DL/UL switches are supported to accommodate regional requirements, then system adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a DL/UL switching mechanism that can operate in multiple modes (e.g., different switching patterns, time intervals, and configurations) to accommodate various regional requirements. The same base mechanism serves multiple functions by accepting different configuration parameters, thereby improving regional adaptability without requiring separate dedicated mechanisms for each region, thus controlling device complexity.
Data Source
AI summary
Methods, systems, and storage media are described for the indication of frequency hopping and downlink (DL)/uplink (UL) configuration in narrowband Internet-of-Things (NB-IoT) systems. Other embodiments may be described and/or claimed.