Reader-Generated Temporary IoT Identifiers for Short Radio Messages
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Solution Overview
Problem
Ambient-power-enabled IoT devices face challenges in efficiently communicating over wireless networks due to limited energy storage and harsh environmental conditions, necessitating innovative communication methods to support inventory and tracking operations.
Innovation Solution
A reader device generates an encrypted temporary device identifier (ETDI) for ambient-power-enabled IoT devices, using encryption algorithms and bitmasks to ensure efficient communication, even when permanent device identifiers exceed maximum message sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If permanent device identifiers (PDI) are used for AIoT devices, then device identification accuracy is improved, but message size exceeds radio interface capacity
Solution Approach 1:
The patent segments the permanent device identifier into two parts: a temporary device identifier (TDI) for radio interface communication and a mapping relationship stored in the reader device. The TDI is shorter and suitable for radio transmission, while the full PDI can be retrieved through mapping when needed, thus resolving the contradiction between identification accuracy and message size.
Solution Approach 2:
The patent introduces a temporary device identifier (TDI) as an intermediary between the permanent device identifier (PDI) and radio interface communication. The TDI serves as a shortened proxy that maintains identification functionality while fitting within radio message size constraints, effectively mediating between the need for accurate identification and transmission limitations.
2Measurement precision
If permanent device identifiers (PDI) are transmitted over radio interface, then device identification is improved, but energy consumption increases
Solution Approach 1:
The patent segments the identification process into two stages: initial communication using short TDI over radio interface (low energy), and detailed identification using full PDI through mapping (higher energy but less frequent). This segmentation reduces overall energy consumption by minimizing radio transmissions of long identifiers.
Solution Approach 2:
The patent creates a copy mechanism where the temporary device identifier (TDI) serves as a simplified representation of the permanent device identifier (PDI). The TDI can be used for most communication purposes without transmitting the full PDI, reducing energy consumption while maintaining identification capability. The full PDI is only retrieved through mapping when absolutely necessary.
3Reliability
If encryption algorithms are applied to generate ETDI, then communication security is improved, but processing complexity increases
Solution Approach 1:
The patent changes the parameters of the identifier through encryption algorithms, transforming the permanent device identifier into an encrypted temporary device identifier (ETDI). This parameter transformation provides security while the encryption/decryption processes are performed by the reader device which has sufficient processing capabilities, balancing security requirements with practical implementation.
Data Source
AI summary
A reader device may receive a request including a permanent device identifier (PDI) for an ambient-power-enabled internet of things (AIoT) device. The reader device may generate an encrypted temporary device identifier (ETDI) based on application of an encryption algorithm to the PDI. Further, the reader device may obtain a short-ETDI based on application of a bitmask to the ETDI. Also, the reader device may transmit, over a radio interface, a trigger message including the short-ETDI to the AIoT device. Moreover, the reader device may receive, over the radio interface, a random access (RA) response message including the short-ETDI from the AIoT device. In an example, the request may be an inventory request, and the inventory request may be received from an AIoT function. Further, the request may include an indication that encryption is supported by the AIoT device.