RFID Inventory Processing With Deterministic Target Responses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In existing RFID inventory processes, the efficiency of responding to query control commands by RFID tags is low due to random value selection, leading to inefficient communication and subsequent inventory processes.
Innovation Solution
A method and apparatus that allow a device to receive a command for inventory and determine whether to feed back code information based on the command, ensuring only the target device responds, thereby optimizing the inventory process and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Tags randomly select values from {0, ..., 2^Q-1} to respond to inventory commands, then collision avoidance is achieved, but response efficiency becomes low due to the random factor
Solution Approach 1:
The patent changes the response mechanism from random value selection to deterministic target-based selection. Tags no longer randomly select from {0, ..., 2^Q-1} but instead deterministically respond based on matching the target value in the command, fundamentally altering the selection parameter from random to targeted
Solution Approach 2:
The reader pre-calculates and embeds the target value (derived from Q and slot number) in the inventory command before transmission. Tags use this pre-provided target value to immediately determine whether to respond, eliminating the need for random selection during the response phase
2Reliability
If only one Tag can be received at a moment in RFID inventory, then signal collision is avoided, but communication efficiency deteriorates due to sequential processing
Solution Approach 1:
The patent segments the inventory process into multiple slots, with each slot targeting a specific calculated value. This segmentation allows different groups of tags to be addressed in different slots, enabling parallel processing of multiple tag groups while maintaining collision-free communication within each slot
Solution Approach 2:
The patent introduces dynamic slot-based targeting where the target value changes with each slot number. This dynamic approach allows the system to adaptively address different tag subsets in different slots, improving overall communication efficiency while maintaining the one-tag-at-a-time reception constraint
3Reliability
If Tags wait for the next round of inventory when random value is not 0, then collision is avoided, but time delay increases affecting subsequent inventory processes
Solution Approach 1:
The reader pre-calculates the target value and includes it in the current inventory command rather than waiting for the next round. Tags can immediately determine their response status by comparing their values with the pre-provided target, eliminating the waiting time for the next inventory round
Solution Approach 2:
The patent allows tags that match the target value to skip the waiting period and respond immediately in the current slot. This rushing through of the response process for matching tags eliminates the time loss associated with waiting for the next inventory round
Data Source
AI summary
An inventory processing method and apparatus and a device are provided. The method includes: A first device receives a first command, where the first command is used for inventory and obtaining code information of a target device; and the first device determines, according to the first command, whether to feed back code information of the first device.