Multichannel-based method for preventing reader collision in RFID system

Abstract

The invention relates to a multichannel-based method for preventing reader collision in an RFID system. The method comprises the following steps of: analyzing the collision types of readers, and constructing a solution for various reader collision problems by combining the information of distances among readers; in order to better execute the solution, establishing a criterion of optimizing data channels aiming at different relationships among the readers; setting a message format of control information so as to enable related readers to conveniently obtain selection information of the channels; in order to better complete communication between the readers and labels, designing a novel communication processing flow so as to better perform a multichannel function; and furthermore simulating and verifying the performance advantages of the method in the aspects of recognizing the command failure number, recognizing the processing time and network load and the like in comparison with existing agreements. The method provided by the invention is suitable for RFID actual scenes with a plurality of readers, and plays a role in pushing the information acquisition technology.

Description

technical field [0001] The invention belongs to the field of radio frequency identification (RFID) communication, and relates to a collision avoidance method applied in an RFID system, in particular to a multi-channel-based reader collision avoidance method in the RFID system. Background technique [0002] Radio Frequency Identification (RFID) is a wireless two-way non-contact automatic identification technology that automatically identifies target objects and obtains relevant data through radio frequency signals. The research of RFID technology has received great attention in recent years, and it is widely used in many fields such as logistics, transmission, security and target tracking. [0003] The RFID system consists of multiple readers and large-scale tags. The tags are usually passive tags with simple structure and low cost. Since there is no power supply device, the energy of the query command sent by the reader is needed to trigger the communication, and there is no...

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Problems solved by technology

[0004] The Colorwave algorithm requires each reader to select a color value from [0,Maxcolors], and communicate with the tag in the color time slot to avoid the collision problem. Since the execution of the algorithm needs to rely on the time synchronization algorithm, the network load Higher; Two channels are set in the Plus protocol, namely: control channel and data channel. When the reader monitors that the control channel is idle, it can communicate with the tag in the data channel. Since only a single data channel is used, the algorithm The performance needs to be improved; the PCP protocol reduces the occurrence of collisions by arranging the read and write sequences of the readers in the cluster, and the GDRA protocol avoids collisions through the geometric probability function. Both of these protocols require a central control node, thus adding additional Hardware consumption; the Dica protocol also uses a single data channel, which can effectively solve the collision problem between the reader and the tag, but it cannot solve the collision problem between the readers; although the MCMAC protocol considers the use of multiple data channels, because the network throughput The amount is high, but because it does not consider the interference between adjacent readers, it can only solve limited collision problems; DiMAC is a distributed protocol that can solve various types of reader collisions. It has two control channels, one It is used to transmit frequency information, and the other is used to transmit time slot information. Its performance is high, but it cannot solve the collision problem of control information.

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