AIoT Group Frequency Hopping for Low-Interference Uplink Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing interference and power consumption for ambient IoT devices, particularly those with limited energy storage capabilities, such as passive and semi-passive AIoT devices, which are prone to destructive interference during simultaneous transmissions.
Innovation Solution
Implementing a non-orthogonal multiple access mechanism through group frequency hopping, allowing a group of AIoT devices to transmit data blocks at different frequencies and time slots, using multi-user detection techniques to decode superimposed signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ambient IoT devices transmit data simultaneously using traditional wireless communication methods, then communication efficiency is improved, but transmission interference increases significantly
Solution Approach 1:
The patent segments the frequency spectrum into multiple carrier frequencies and divides the group of AIoT devices into different subsets, each transmitting on different frequencies at different time slots. This segmentation of frequency resources and device groups reduces simultaneous transmissions on the same frequency, thereby reducing interference while maintaining overall communication efficiency.
Solution Approach 2:
The patent implements periodic frequency hopping where devices switch between different carrier frequencies in a cyclic manner across multiple time slots. This periodic action ensures that the same frequency is not continuously occupied by the same device, reducing cumulative interference and allowing efficient reuse of frequency resources over time.
2Object-generated harmful factors
If complex interference mitigation mechanisms like SCMA or OFDM are implemented, then transmission interference is reduced, but device complexity increases
Solution Approach 1:
The patent changes the parameter of carrier frequency dynamically through frequency hopping, rather than using complex signal processing techniques. By simply changing the frequency parameter over time slots and device groups, the system achieves interference mitigation without requiring complex algorithms like SCMA or OFDM, thus keeping device complexity low.
Solution Approach 2:
The patent introduces dynamic frequency allocation where the carrier frequency assigned to each device changes over time based on its group membership and time slot. This dynamic approach to frequency assignment provides adaptive interference management without requiring complex real-time signal processing, maintaining simplicity while effectively reducing interference.
3Object-generated harmful factors
If frequency hopping is implemented for each individual device, then interference is reduced, but power consumption increases
Solution Approach 1:
The patent merges the frequency hopping behavior of multiple devices into group-level frequency assignment. Instead of each device independently performing frequency hopping, entire groups of devices share the same frequency hopping pattern, reducing the computational and energy overhead per device while still achieving interference reduction through diversified frequency usage across groups.
Data Source
AI summary
Various aspects of the present disclosure relate to group frequency hopping for ambient Internet of Things (AIoT) devices. For example, a non-orthogonal multiple access mechanism for AIoT devices enabling a group of devices to simultaneously and non-orthogonally transmit different transport blocks (TBs) to a receiver device (a base station, UE, and so on). The group of UEs may perform group frequency hopping to transmit data blocks at different frequencies and time slots. A receiver device may then detect the transmissions (e.g., superimposed signals) using multi-user detection techniques.