MulteFire NB IoT Special Subframe Switching
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Solution Overview
Problem
Current IoT technologies face challenges in reducing the cost and power consumption of user equipment (UEs) while ensuring enhanced coverage, particularly in unlicensed spectrum bands, where licensed spectrum scarcity limits data rate and frequency hopping offers more benefits than digital modulation.
Innovation Solution
The implementation of MulteFire (MF) narrowband Internet of Things (IoT) systems that utilize special subframes for downlink-uplink switching and frequency retuning, allowing for efficient switching between receiving and transmitting modes, and leveraging frequency hopping to exploit diversity and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If frequency hopping is used in unlicensed spectrum bands, then diversity and power consumption are improved, but device complexity increases
Solution Approach 1:
The patent segments the communication frame into distinct downlink and uplink portions with clear switching boundaries. This segmentation enables efficient frequency hopping by defining specific time intervals for each direction, reducing the complexity of managing simultaneous bidirectional communications while maintaining low power consumption through structured transmission patterns.
Solution Approach 2:
The patent implements dynamic switching between downlink and uplink modes based on traffic conditions. The system can adaptively adjust the timing and duration of each mode, allowing frequency hopping to exploit diversity benefits while managing device complexity through flexible, condition-based transitions rather than fixed rigid schedules.
2Productivity
If special subframes are used for downlink-uplink switching, then switching efficiency is improved, but time resources are consumed
Solution Approach 1:
The patent defines special subframes with predetermined structures that prepare the system for upcoming switching events. By pre-configuring the timing and resources for downlink-uplink transitions, the system achieves efficient switching without requiring additional time resources for coordination or setup, as the special subframe structure itself embodies the switching protocol.
Solution Approach 2:
The patent ensures continuous useful action by making the special subframes carry useful control information and by minimizing idle gaps between downlink and uplink transmissions. The special subframes are designed to overlap or transition seamlessly with data transmission, maintaining system productivity while consuming minimal additional time resources.
3Adaptability or versatility
If frequency retuning is enabled, then adaptability is improved, but switching time increases
Solution Approach 1:
The patent implements periodic frequency retuning opportunities within the special subframe structure. Rather than requiring continuous or ad-hoc retuning, the system uses periodic switching intervals defined by the special subframe timing, which allows frequency retuning to occur at optimal moments without increasing overall switching time. This periodic approach maintains adaptability while managing time resources efficiently.
Data Source
AI summary
Technology for a user equipment (UE) operable for MulteFire (MF) narrowband (NB) internet of things (IoT) is disclosed. The apparatus can comprise one or more processors configured to: decode a special subframe from a data segment carried on an nframe that is transmitted in a data channel; identify a downlink pilot time slot (DwPTS) and a guard period (GP) from the special subframe; and switch from receiving in the data channel to transmitting in the data channel during a duration of the special subframe.