Multipath recognition method with two-way communication function

Abstract

The invention provides a multipath recognition method with the two-way communication function. A time parameter is added into an information frame of a reader, and an active electronic tag can effectively estimate a channel-idle time period of the reader according to a received parameter and a current running state after receiving the information frame of the reader; the active electronic tag can transmit tag information to the reader in a proper time slot by virtue of a random number generation-based time slot judgment method; information interaction between the active electronic tag and the reader is finally realized. The method is compatible with a natural hardware system, and the increase of battery power consumption of the active electronic tag is prevented; the channel idleness detection and time slot judgment methods are stable, reliable, simple and practical.

Description

technical field [0001] The invention relates to the field of communication, in particular to an ambiguity path identification method for two-way communication by using the channel idle detection and time slot judgment methods in the RFID system. Background technique [0002] At present, the application system with RFID as the core is gradually being applied in the field of intelligent transportation such as highways. Taking the path identification system of the expressway as an example, the RFID system consists of three parts: a roadside base station (a special reader on the road), a card reader and an electronic tag. At the entrance of the expressway, the electronic tag completes the initial information setting of the tag through the lane card reader; on the expressway, the electronic tag completes the information interaction with the roadside base station and saves the necessary path information; The card reader reports the stored route information, and the lane software ...

AI Technical Summary

Problems solved by technology

However, this method is not suitable for active electronic tags

First of all, the detection of RSSI requires that the radio frequency circuit of the electronic tag is always in the radio frequency receiving state, so that the electronic tag will significantly increase the battery power consumption

Secondly, the detection of RSSI may be interfered by the external environment, resulting in inaccurate detection of RSSI, resulting in unnecessary power consumption and reducing the stability of communication between the reader and the electronic tag

In addition, due to the constraints of hardware cost and software complexity, it is impossible for electronic tags to implement overly complex communication protocols, channel detection and time slot judgment algorithms.

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