CN114386440A - Information anti-collision method, system, equipment and storage medium in radio frequency identification - Google Patents
Information anti-collision method, system, equipment and storage medium in radio frequency identification Download PDFInfo
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Abstract
The embodiment of the invention discloses a method, a system, equipment and a storage medium for preventing information from being collided in radio frequency identification, wherein the method is applied to an information receiver and comprises the following steps: determining a feedback time slot according to time slot selection information included in a first query command sent by an information sender and determining identity identification information according to the effective identification number and the effective identification information included in the first query command; and after receiving the second query command, if the sending time slot in the second query command is equal to the feedback time slot, sending the identity identification information to the information sender so as to realize the anti-collision of the identity identification information through the feedback time slot. The problem that the information sender cannot accurately identify the information due to the fact that a plurality of information receivers send the fed back information in the same time slot when the information receiver feeds back the information to the information sender in radio frequency identification is solved, information collision caused by the fact that all the information receivers feed back the identity identification information in the same time slot is avoided, and anti-collision of the identity identification information is achieved.
Description
Technical Field
The embodiment of the invention relates to the technical field of radio frequency identification, in particular to a method, a system, equipment and a storage medium for information anti-collision in radio frequency identification.
Background
The radio frequency card protocol comprises two transmission protocols and equipment of Type A and Type B. The transmission coding adopted by the two protocols and the like are distinguished as follows: the Type a Type of subcarrier uses Manchester Encoding, which is a Type of bit Encoding, and the unit that can support collision detection is a bit; the Type B Type sub-carriers use BPSK coding, which is a kind of phase coding, so bit collision cannot be detected.
To solve the tag collision problem, the RFID system employs two types of collision avoidance algorithms: one is a deterministic collision avoidance algorithm, such as a binary search algorithm, a dynamic binary search algorithm, a jumping dynamic tree algorithm, a query tree algorithm, a dynamic query tree algorithm, a backward index search algorithm, etc.; the deterministic anti-collision algorithm has no randomness in the whole identification process, improves the signal transmission rate, has high channel utilization rate and stable performance, but has the defects of high complexity, long system identification time delay and the like, and when the number of labels is excessive, the system efficiency is reduced. The other is a random competition type anti-collision algorithm, such as an ALOHA algorithm, a slotted ALOHA algorithm, a dynamic frame slotted ALOHA algorithm, a packet enhanced dynamic ALOHA anti-collision algorithm, and the like. The algorithm mostly adopts a mode of 'tag speaking first', namely, the tag automatically sends the ID of the tag to the reader-writer as soon as entering the reading area of the reader-writer, and then the tag and the reader-writer start communication. The ALOHA algorithm is a kind of random access algorithm, and when a tag is to transmit data information, it can randomly transmit at any time period, and is called a pure ALOHA algorithm. Due to the randomness of label sending, the label transmitting time does not need to be synchronized, and the algorithm is simpler to realize. When the number of the tags in the action range of the reader is not large, the pure ALOHA algorithm can well identify the tag data information.
However, for tag identification of Type B Type, a time slot method is usually used, and a tag generates a random number to decide which time slot to reply to feedback, if only one tag replies to the time slot, the ID of the tag is identified, and DESELECT may be performed to make it not reply to the REQB command, so as to avoid increasing the collision of subsequent identifications. However, this method needs to add a random number module, the probability of collision still exists after the random, and when there are many or very many tags, the tags may be collided each time, and the tags cannot be effectively identified.
Disclosure of Invention
The invention provides an information anti-collision method, system, equipment and storage medium in radio frequency identification, so as to realize efficient and accurate identification of an information sender.
In a first aspect, an embodiment of the present invention provides an information anti-collision method in radio frequency identification, where the method is applied to an information receiver, and includes:
determining a feedback time slot according to time slot selection information included in a first query command sent by an information sender and determining identity identification information according to the effective identification number and the effective identification information included in the first query command;
and after receiving a second query command, if the sending time slot in the second query command is equal to the feedback time slot, sending the identity identification information to the information sender so as to realize the anti-collision of the identity identification information through the feedback time slot.
In a second aspect, an embodiment of the present invention further provides an information anti-collision method in radio frequency identification, where the method is applied to an information sender, and includes:
generating a first query command according to a preset query command format, and sending the first query command to an information receiver, wherein the preset query command format at least comprises time slot selection information;
sending each second query command to the information receiver, wherein the second query command at least comprises a sending time slot;
and receiving the identity recognition information fed back by the information receiver so as to realize the anti-collision of the identity recognition information fed back by the information receiver through the first query command.
In a third aspect, an embodiment of the present invention further provides an information anti-collision system in radio frequency identification, where the information anti-collision system in radio frequency identification includes: an information receiver and an information sender;
the information receiver comprises: the device comprises a determining module and an information sending module;
the determining module is used for determining a feedback time slot according to time slot selection information included in a first query command sent by an information sender and determining identity identification information according to the number of effective identifications and the effective identification information included in the first query command;
the information sending module is configured to send the identification information to the information sender after receiving a second query command and if a sending time slot in the second query command is equal to the feedback time slot, so as to achieve collision prevention on the identification information through the feedback time slot;
the information sender comprises: the device comprises a first instruction sending module, a second instruction sending module and a receiving module;
the first instruction sending module is used for generating a first query command according to a preset query command format and sending the first query command to an information receiving party so that the information receiving party can determine a feedback time slot and identity identification information according to the first query command;
a second instruction sending module, configured to send each second query command to the information receiving party, so that the information receiving party sends the identification information when a sending time slot in the second query command is equal to the feedback time slot;
and the receiving module is used for receiving the identity recognition information fed back by the information receiving party so as to realize the anti-collision of the identity recognition information fed back by the information receiving party through the first query command.
In a fourth aspect, an embodiment of the present invention further provides an apparatus, where the apparatus includes:
one or more processors;
a storage device for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors implement a method for collision avoidance of information in radio frequency identification according to any one of the embodiments of the present invention.
In a fifth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a method for collision avoidance for information in radio frequency identification according to any one of the embodiments of the present invention.
The embodiment of the invention provides an information anti-collision method, a system, equipment and a storage medium in radio frequency identification, wherein a feedback time slot is determined according to time slot selection information included in a first query command sent by an information sender, and identity identification information is determined according to the effective identification number and the effective identification information included in the first query command; after receiving a second query command, if the sending time slot in the second query command is equal to the feedback time slot, sending the identification information to the information sender to realize the anti-collision of the identification information through the feedback time slot, solving the problem that the information sender cannot accurately identify the information due to the fact that a plurality of information receivers send feedback information in the same time slot when the information sender (host) queries the identification information of the information receiver (label) in radio frequency identification, the information receiver determines the feedback time slot by selecting the information according to the time slot included in the first query command, after receiving the second query command, if the sending time slot in the second query command is equal to the feedback time slot, the identification information is fed back to the information sender, and each information receiver can determine the feedback time slot thereof, only the second query command is just the feedback time slot of the second query command, the identification information is sent, otherwise, the second query command waits, so that information collision caused by the fact that all information receivers feed back the identification information in the same time slot is avoided, and the anti-collision of the identification information is realized.
Drawings
Fig. 1 is a flowchart of a method for preventing collision of information in radio frequency identification according to a first embodiment of the present invention;
fig. 2 is a flowchart of an information collision prevention method in radio frequency identification according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an information collision avoidance system in radio frequency identification according to a fourth embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus in the fifth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of an information anti-collision method in radio frequency identification according to an embodiment of the present invention, where the embodiment is applicable to an information anti-collision situation in radio frequency identification, and the method is applied to an information receiving party, and specifically includes the following steps:
step S110, determining a feedback time slot according to the time slot selection information included in the first query command sent by the information sender, and determining the identity identification information according to the effective identification number and the effective identification information included in the first query command.
In this embodiment, the information receiver may be understood as a computer device that receives the query information and performs corresponding feedback, for example, a tag in the radio frequency identification technology, and the information receiver has a unique identity Identifier (ID); the sender of the information may be understood as a computer device having a need to query other users in the vicinity, for example a reader in radio frequency identification technology, which may be a host device. The first query command can be understood as a query command sent by the information sender when querying the information receiver, and is used for the information receiver to determine respective feedback time slots, and the information receiver does not need to feed back the first query command; the time slot selection information can be understood as information contained in the first query instruction and is used for the information receiver to select the corresponding feedback time slot; the effective identification number can be understood as a numerical value preset according to the length of the identity identifier of the information receiver; the effective identification information can be understood as a preset binary number; the identification information can be understood as a part of or all data in the identification identifier, and the information receiver needs to feed back the identification information to the information sender so that the information sender can determine the identification identifier of the information receiver according to the identification information; the effective identification number and the effective identification information are used for restricting whether the information receiver sends the identification information.
In radio frequency identification, an information sender first sends information to each information receiverAnd sending a first query command, and after receiving the first query command, the information receiver determines a feedback time slot according to the time slot selection information in the first query command. The time slot selection information is a set of data, the time slot selection information is usually set according to the length of the identity identifier, for example, the identity identifier ID is 8 bits, and the time slot selection information can be set to 0123(hex)The information receiver selects numbers consisting of bit0, bit1, bit2 and bit3 of the ID of the information receiver as feedback time slots. And the information receiver judges the data of the position corresponding to the effective identification number in the identity identifier according to the effective identification number, and judges whether the data of the position corresponding to the effective identification number in the identity identifier is effective or not according to the effective identification information, so that the feedback time slot after the first query command is determined, and whether the identity identification information should be replied to the information sender or not is determined.
The number of valid identifications can be set to 0 or other values, since in practical applications the ID of the information receiver is usually selected to be 2nTherefore, the corresponding valid identification numbers are usually selected from 0, 4 and 8 …, and when the valid identification number is set to 0, there is no limitation on the ID of the information receiver at this time, that is, all the information receivers reply, so that the valid identification information does not have any limitation on the information receiver even if set, and thus, the valid identification information may not be set. When the number of valid identifications is not 0, valid identification information needs to be set correspondingly. When the information sender generates a first query command, effective identification information in the first query command is a byte (byte), if the effective identification information is not the byte, the lower bit is supplemented with 0 or the upper bit is supplemented with 0 to be the byte, and if the effective identification information is from the lower bit, the upper bit is supplemented with zero; if the valid identification information is from the upper bits, zero padding is performed for the lower bits.
Optionally, determining the feedback time slot according to the time slot selection information included in the first query command sent by the information sender may be implemented in the following manner:
determining each data bit in the time slot selection information; acquiring an identity identifier, and determining data corresponding to each data bit in the identity identifier; and determining a feedback time slot based on the value corresponding to each data.
In this embodiment, the data bits can be understood as the positions in the data represented by the slot selection information, for example, the slot selection information is 7654(hex)The data bits are bit7, bit6, bit5 and bit 4.
The information receiver firstly determines each data bit according to the time slot selection information, then obtains the own identity identifier, determines the data of each corresponding data bit in the identity identifier according to each data bit, and determines the feedback time slot according to the numerical value corresponding to each data. Illustratively, the id of the information receiver is 00111111, and thus, the slot selection information may be set to 7654(hex)Each data bit is bit7, bit6, bit5 and bit4, the data corresponding to each data bit in the identity identifier is 0011, so the feedback time slot is 3, and the information receiver feeds back in time slot 3.
Optionally, determining the identification information according to the effective identification number and the effective identification information included in the first query command may be implemented in the following manner:
if the effective identification number is zero, taking an identity identifier as the identity identification information; otherwise, determining the effective bit information of the identity identifier according to the effective identification number;
and if the effective identification information is equal to the effective bit information, taking the residual data without the effective identification information in the identity identifier as the identity identification information.
In this embodiment, the valid bit information may be understood as a part of data in the identity identifier, and the valid bit information is obtained by selecting the data in the identity identifier according to the valid identification number.
When the number of effective identifications is zero, the ID of the information receiver is not screened at this time, all the information receivers need to feed back, and because no screening is carried out, the identity identifier is directly used as the identity identification information to feed back. When the number of effective identifications is not zero, screening the ID of the information receiver at the moment, namely, designating the information receiver for feedback; determining data corresponding to the effective identification number in the identity identifier as effective bit information, if the effective identification information is equal to the effective bit information, a receiver of the information needs to feed back, and feeding back the residual data without the effective identification information in the identity identifier as the identity identification information; otherwise, no feedback is performed. Illustratively, the identity identifier of the information receiver is 00111111, the number of valid identifications is 4, and the valid identification information is 0011; the effective bit information is 0011, and the effective bit information is equal to the effective identification information, so that the information receiver with the identity identifier of 00111111 feeds back 1111 as the identification information to the information sender. In this embodiment, the number of valid identifications n is the first n-bit data, or may be set as the last n-bit data, and the information receiver may know whether the number of valid identifications in the first query command sent by the information sender refers to the first n-bit data or the last n-bit data, and may decide in advance, or may inform when sending the first query command. Zero padding is carried out when the identification information is not the whole byte, and high-order zero padding is carried out when the identification information is padded with zero if the effective identification number and the effective identification information included in the first query command are from low order; and if the effective identification number and the effective identification information included in the query command are from the high order, zero padding is carried out on the low order when the identification information is padded.
Step S120, after receiving the second query command, judging whether the sending time slot in the second query command is equal to the feedback time slot, if so, executing step S130; otherwise, step S140 is executed.
In this embodiment, the second query command may be understood as an instruction sent by the information sender to the information receiver, and the information receiver needs to perform corresponding feedback; the transmission time slot may be understood as information indicating when the second query command is transmitted in the time slot, and may be 0, 1, 2, 3 …, and when the host transmits the second query command, it may preset how many time slots data are transmitted in total, that is, the number of transmission time slots is 16, for example, the transmission time slots are 0, 1, 2 … 14, 15.
After the information receiver receives the second query command, judging whether the sending time slot in the second query command is equal to the feedback time slot, if so, feeding back the time slot; otherwise, no feedback is carried out, and the next second query command is waited.
Step S130, identity identification information is sent to the information sender.
Step S140, no operation is performed.
Because the number of the information receivers is multiple, and each information receiver selects the feedback time slot according to the first query command, the information sender may or may not receive the identification information fed back by the information receiver after sending the second query command. And after one second query command is sent, sending the next second query command after a set time interval until the second query command is completely sent. The information receiver only needs to judge whether the sending time slot in the second query command is equal to the feedback time slot after receiving the second query command, and if so, the information receiver sends the identification information to the information sender; otherwise, no operation is performed.
The embodiment of the invention provides an information anti-collision method in radio frequency identification, which solves the problem that when an information sender inquires the identity information of an information receiver in radio frequency identification, the information receiver can not accurately identify information due to the fact that a plurality of information receivers send feedback information in the same time slot when the information receiver feeds back information to the information sender, the information receiver determines a feedback time slot by selecting information according to the time slot included in a first inquiry command, after receiving a second inquiry command, if the sending time slot in the second inquiry command is equal to the feedback time slot, the identity identification information is fed back to the information sender, because each information receiver can determine the own feedback time slot, the identity identification information can be sent only if the second inquiry command is just the own feedback time slot, and if not, the information collision caused by the fact that the information receivers all feed back the identity identification information in the same time slot is avoided, the anti-collision of the identity recognition information is realized. The method of the embodiment of the application associates the feedback time slot of the information receiver with the ID value of the information receiver, reduces functional modules of hardware, such as a random number module, solves the problem that the information receiver cannot be identified all the time due to too many collisions when the information receiver is too many, and avoids the limitation that many methods cannot be used due to the fact that the bit collision detection cannot be carried out by Type B radio frequency identification.
Example two
Fig. 2 is a flowchart of an information anti-collision method in radio frequency identification according to a second embodiment of the present invention, where this embodiment is applicable to a situation of information anti-collision in radio frequency identification, and the method is applied to an information sender, and specifically includes the following steps:
step S210, generating a first query command according to a preset query command format, and sending the first query command to the information receiver, so that the information receiver determines the feedback time slot and the identification information according to the first query command.
In this embodiment, the preset query command format may be understood as a format specification preset before the first query command is sent, so as to form the first query command. And setting corresponding data according to a preset query command format to form a first query instruction and sending the first query instruction to an information receiver.
Step S220, sending each second query command to the information receiver, so that the information receiver sends the identification information when the sending time slot in the second query command is equal to the feedback time slot.
After the information sender sends the first query command, the second query command is sent after a period of time. The first query command indicates which feedback time slot the information receiver feeds back, the information receiver does not need to feed back, and the information receiver feeds back correspondingly when receiving the second query command. Before sending the second query command, the number of the second query commands to be sent is set, and then each second query command is sent according to a certain time interval.
Step S230, receiving the identification information fed back by the information receiver, so as to achieve anti-collision of the identification information fed back by the information receiver through the first query command.
And after the receiving party receives the second query command, the identity identification information received before the second query command is sent is used as the feedback information of the first second query command. That is, each second query command has a certain transmission time interval, and if the feedback information is received in the time interval, all the received feedback information is used as a response of the second query command, and if the feedback information is not received, the second query command has no feedback information, that is, no information receiver selects the transmission time slot in the second query command as its feedback time slot.
The embodiment of the invention provides an information anti-collision method in radio frequency identification, which solves the problem that when an information sender inquires identity information of an information receiver in radio frequency identification, the information receiver cannot accurately identify information due to the fact that a plurality of information receivers send feedback information in the same time slot when the information receiver feeds back information to the information sender. The embodiment of the application realizes that the first query command generated by the query information receiver is simultaneously suitable for Type B and Type A information receivers.
Optionally, the method further includes:
when receiving an identification information corresponding to the second query command, storing the identification information;
when at least two pieces of identification information are received corresponding to the second query command, the sending time slot in the second query command is determined to be a conflict time slot, and the first query command is updated so as to send a new first query command to the information receiving party until all the identification information is obtained.
In this implementation, for the same second query command, the identity recognition information fed back by at least two information receivers is received, and since the identity recognition information is sent in a collision, the information sender cannot recognize the identity recognition information at this time, and the sending time slot in the second query command is determined as a collision time slot.
After the information sender sends the second query command, the identity recognition information fed back by the information receiver is received, and when the identity recognition information is received corresponding to the second query command, the identity recognition information can be accurately recognized and stored; when at least two pieces of identification information are received corresponding to one second query command, the sending time slot in the second query command is determined to be a conflict time slot, the received identification information cannot be identified at the moment, the first query command is updated, the first query command is sent to the information receiving party again, so that the information receiving party reselects the feedback time slot, and the identification information is fed back when the second query command is received.
Optionally, updating the first query command may be implemented by:
and when the number of effective identifications in the first query command is zero, updating the time slot selection information in the first query command according to the length of the identity identifier of the information receiver, and generating a new first query command.
When the number of valid identifications in the first query command is zero, all information receivers need to perform feedback, and if the length of the identity identifier is 8, the slot selection information in the first query command sent for the first time can be set to 7654(hex)At this time, the slot selection information is updated, and the new slot selection information may be set to 3210(hex)，7610(hex)Etc. as long as it is not 7654(hex)That is, if a conflict still occurs, the time slot selection information is updated again to form a new first query instruction, and each time the time slot selection information is updated, the time slot selection information is not the same as the previous time slot selection information (if the time slot selection information is the same as the previous time slot selection information, the same command is executed, and new identification information is not queried, so that the time slot selection information is meaningless). At this time, when the inquiry is performed, it is necessary to know how many information receivers are, and then the inquiry is stopped after all the information receivers are inquired.
Optionally, updating the first query command may be implemented by:
when the effective identification number in the first query command is not zero, updating the effective identification number according to the length of the time slot selection information in the first query command, updating the effective identification information in the first query command according to the conflict time slot, updating the time slot selection information according to the length of the identity identifier of the information receiver, and generating a new first query command.
And when the effective identification number in the first query command is not zero, screening the information receiver through the effective identification number and the effective identification information. The first query command at least includes slot selection information, effective identification number and effective identification information, and the effective identification number is updated according to the length of the slot selection information in the first query command sent last time, for example, the slot selection information is 7654(hex)The length is 4 bits, so the effective identification number is set to be 4; and determining a conflict time slot according to the received identity identification information, updating the effective identification information according to the conflict time slot, and taking data corresponding to the conflict time slot as the effective identification information, thereby realizing the purpose of independent reply of a conflict information receiver. Updating the time slot selection information according to the length of the identity identifier of the information receiver, for example, the length of the identity identifier is 8, and the time slot selection information in the first query command sent for the first time is 7654(hex)The new slot selection information may be set to 3210(hex)。
When the information sender sends the first query command for the first time, the number of valid identifications is set to 0, and the valid identification information at this time is omitted and may not be set. And after the information receiver determines the corresponding feedback time slot and the corresponding identity identification information according to the first query command, the information receiver feeds back the corresponding feedback time slot and the corresponding identity identification information after receiving the second query command. And if all the identity identification information received by the information sender does not collide, identifying all the information receivers and storing the information receivers. However, in practical application, collision often occurs, so after collision occurs, the identification information without collision is stored, the first query command is updated, and query is performed again until all the identification information is queried. When the first query command is sent again after the collision occurs, the number of valid identifications and the valid identification information may or may not be set. Usually, when the number of information receiving parties is known and is not too large, the number of effective identification numbers and the effective identification information (namely the number of effective identification numbers is 0) can be selected not to be set when the first query command is sent again after collision occurs; when the number of information senders is not known or is too large, the number of effective identifications and the effective identification information are selected and set.
The embodiment of the invention judges whether the conflict occurs after receiving the identity identification information fed back by the information receiver, and the first query command is updated and queried again after the conflict occurs, thereby realizing the identification of all the information receivers. And different updating modes of the first query command are respectively selected for updating under the condition that the data volume of the information receiving party is known and unknown, so that the proper selection of the identification mode is realized, and the identification speed of the information receiving party is improved.
EXAMPLE III
The embodiment of the invention provides two inquiry processes of an information sender to an information receiver:
illustratively, the format of the preset query command when the information sender sends the first query command is as follows:
SOF in the first query command represents start; the number of the time slots represents the number of the second query command to be sent; CRC stands for cyclic redundancy check; EOF stands for end.
The second query command format is:
| SOF | SLOT | CRC | EOF |
SLOT represents a transmission SLOT, and is determined according to the number of SLOTs, for example, the number of SLOTs is 16, and the transmission SLOT is 0 to 15.
The format of the feedback identity recognition information of the information receiver is as follows:
| SOF | identity recognition information | CRC | EOF |
When the number of effective identifications is not 0, the identification information is the identification identifier, the rest part of the sent effective identification information is removed, and if the rest part is not the full byte, the low-order complement 0 is supplemented to the full byte; if the effective identification number is 0, the complete identity identifier is replied. When the information receiver determines that the feedback time SLOT is 5 and the SLOT (transmission time SLOT) in the second query command is 1, the information receiver waits without performing feedback until the identification information is fed back when the SLOT (transmission time SLOT) in the second query command is 5.
The first query process: the method is suitable for the condition that the number of the information receivers is small and the number of the information receivers is known, and the shielding of partial information receivers is not needed, so that the effective identification number is 0.
Assuming that 16 information receivers are provided, the length of the ID of the information receiver is 8 bits, and the IDs of the information receivers are respectively: 5A(hex)，3F(hex)，6D(hex)，71(hex)，D2(hex)，D8(hex)，09(hex)，0A(hex)，88(hex)，6F(hex)，66(hex)，34(hex)，44(hex)，47(hex)，49(hex)，55(hex)；
(a) Setting slot selection information 7654(hex)And the number of slots is 16, three situations can be obtained: the empty time slot is: 1, 2, 9, a, B, C, E, F; the time slots with the ID of 71 are identified as 7 and 8(hex)，88(hex)(ii) a The time slots of the collision are 0, 3, 4, 5, 6, D; a total of 2 IDs are identified;
(b) setting timeslot selection information to 3210(hex)And the number of time slots is 16, three situations can be obtained: the empty time slot is: 0, 3, B, C, E; the time slots with ID of 71 are identified as 1, 2, 5, 6, 7, D and F(hex)，D2(hex)，55(hex)，66(hex)，47(hex)，6D(hex)，6F(hex)(ii) a The time slot of the conflict is 4, 8, 9, A; a total of 8 IDs are identified;
(c) setting timeslot selection information to 7610(hex)And the number of time slots is 16, three situations can be obtained: the empty time slot is: 9, A, B, D, F; the time slots for identifying ID are 0, 1, 2, 3, 4, 8, C and E, and the ID is 34(hex)，09(hex)，0A(hex)，3F(hex)，44(hex)，88(hex)，D8(hex)，D2(hex)(ii) a The time slots of the conflict are 5, 6 and 7; a total of 14 IDs are identified;
(d) setting timeslot selection information to 5432(hex)And the number of time slots is 16, three situations can be obtained: the empty time slot is: 0, 3, 7, 8, a, E; the time slots with ID of 4, 5, 9, C, D and F are identified, and the ID of D2(hex)，55(hex)，66(hex)，71(hex)，34(hex)，3F(hex)(ii) a The time slot of the conflict is 1, 2, 6, B; still identify 14 IDs;
(e) setting time slot selection information to 6420(hex)And the number of time slots is 16, three situations can be obtained: the empty time slot is: 2, 3, 4, 5, 8, E; the time slot with the ID of 09 is identified as 1, 6, 7, 9, D and F(hex)，34(hex)，3F(hex)，71(hex)，55(hex)(ii) a The time slots of the conflict are 0, A, B and C; a total of 15 IDs are identified;
(f) setting time slot selection information to 6431(hex)And the number of time slots is 16, three situations can be obtained: the empty time slot is: 0, 1, 5, 6, 8; the time slots for identifying ID are 3, 7, B, D, E and F, and the ID is 0A(hex)，3F(hex)，6F(hex)，D2(hex)，D8(hex)，5A(hex)(ii) a The time slots of the conflict are 2, 4, 9, A and C; a total of 16 IDs are identified and the identification tag ends.
The second inquiry process: the method is suitable for the condition that the number of the information receivers is large or the number of the information receivers is not known.
Assuming that 16 information receivers are provided, the length of the ID of the information receiver is 8 bits, and the IDs of the information receivers are respectively: 5A(hex)，3F(hex)，6D(hex)，71(hex)，D2(hex)，D8(hex)，09(hex)，0A(hex)，88(hex)，6F(hex)，66(hex)，34(hex)，44(hex)，47(hex)，49(hex)，55(hex)；
(a) Setting slot selection information 7654(hex)And the number of slots is 16, three situations can be obtained: the empty time slot is: 1, 2, 9, a, B, C, E, F; the time slots with the ID of 71 are identified as 7 and 8(hex)，88(hex)(ii) a The time slots of the collision are 0, 3, 4, 5, 6, D; a total of 2 IDs are identified;
(b) if the number of valid identifications is 4, the valid identification information is 00000000(bin)At the time of setting upThe slot selection information is 3210(hex)And the number of time slots is 16, two cases can be obtained: the empty time slot is: 0, 1, 2, 3, 4, 5, 6, 7, 8, B, C, D, E, F; the time slot in which the ID is recognized is 9, A, and the ID is 09(hex)，0A(hex)(ii) a No time slot in which collision occurs; a total of 4 IDs are identified;
(c) if the number of valid identifications is 4, the valid identification information is 00110000(bin)The time slot selection information is set to 3210(hex)And the number of time slots is 16, two cases can be obtained: the empty time slot is: 0, 1, 2, 3, 5, 6, 7, 8, 9, a, B, C, D, E; the slot where the ID is identified is 4, F, and the ID is 34(hex)，3F(hex)(ii) a No time slot in which collision occurs; a total of 6 IDs are identified;
(d) let the number of valid identifications be 4 and the valid identification information be 01000000(bin)The time slot selection information is set to 3210(hex)And the number of time slots is 16, two cases can be obtained: the empty time slot is: 0, 1, 2, 3, 5, 6, 8, a, B, C, D, E, F; the time slots with ID of 44 are identified as 4, 7 and 9(hex)，47(hex)，49(hex)(ii) a No time slot in which collision occurs; a total of 9 IDs are identified;
(e) let the number of valid identifications be 4 and the valid identification information be 01010000(bin)The time slot selection information is set to 3210(hex)And the number of time slots is 16, two cases can be obtained: the empty time slot is: 0, 1, 2, 3, 4, 6, 7, 8, 9, B, C, D, E, F; the slot identifying the ID is 5, A, ID is 55(hex)，5A(hex)(ii) a No time slot in which collision occurs; a total of 11 IDs are identified;
(f) if the number of valid identifications is 4, the valid identification information is 01100000(bin)The time slot selection information is set to 3210(hex)And the number of time slots is 16, two cases can be obtained: the empty time slot is: 0, 1, 2, 3, 4, 5, 7, 8, 9, a, B, C, E; the time slot with the ID of 66 is identified as 6D and F(hex)，6D(hex)，6F(hex)(ii) a No time slot in which collision occurs; a total of 14 IDs are identified;
(g) if the effective identification number is 4, haveThe effective identification information is 11010000(bin)The time slot selection information is set to 3210(hex)And the number of time slots is 16, two cases can be obtained: the empty time slot is: 0, 1, 3, 4, 5, 6, 7, 9, a, B, C, D, E, F; the time slot in which the ID is recognized is 2, 8, and the ID is D2(hex)，D8(hex)(ii) a No time slot in which collision occurs; a total of 16 IDs are identified.
In the two query processes, the default sequence of the time slot selection information is from high to low when set, the effective identification information is fixed at high when set, and can also be set from low to high, for example 0123(hex)Accordingly, the effective identification information is fixed at a low level at the time of setting. In practical applications, the length of the id of the information receiving party can be set to 2, 4, 8, etc., when the length of the id of the information receiving party is short, the number of time slots is usually set to 16 when the length of the id of the information receiving party is long.
In the second polling procedure, the slot selection information in the first polling command is set 7654(hex)Therefore, the number of valid identifications in the updated first query command is 4, the number of valid identifications is set according to the conflicting time slots 0, 3, 4, 5, 6, D, and the time slot selection information is updated to 3210(hex). And sequentially sending the updated first query commands so that the information receiver determines the feedback time slot of the information receiver again and feeds back the information after receiving the second query command.
In the above example, in steps (b) - (g), no conflicting time slots occur, but in practical applications, a conflict may occur again, and if a conflict occurs again, a new first query instruction is generated again according to the conflicting time slots, and the conflicting time slots are continuously assigned with the valid identification numbers and the valid identification information, so that the conflicting time slots are independently replied, and at this time, the valid identification numbers are sequentially increased by 4.
Illustratively, the second query procedure takes the length of the ID of the information receiver as 32 bits as an example: when the first inquiry command is generated for the first time, the time slot selection information is set to 31, 30, 29 and 28 to obtain each conflict time slot, for example, 0, and the first inquiry command is generated again, in this case, the number of valid identifications is 4, and the number of valid identifications is 00000000(hex)The time slot selection information is set to be 27, 26, 25 and 24, and the obtained conflict time slot is 1; the first query command is generated again, the number of valid identifications is 8 at this time, and the valid identification information is 00000001(hex)And setting the time slot selection information to be 23, 22, 21 and 20 until no conflict time slot exists, and completing the traversal of the node. In the above exemplary example, the number of the conflicting nodes is only one, and in practical applications, there may be many conflicting nodes, so that the first query command may be updated in sequence. In the embodiment of the present application, the length of the timeslot selection information is selected to be 4, because the length of the id identifier of the information receiver is usually 8 bits, 16 bits, or 32 bits in practical application, and the timeslot selection information may also be set to be 76 bits(hex)、54(hex)Etc., and correspondingly, the number of valid recognitions is set to 2.
Example four
Fig. 3 is a schematic structural diagram of an information collision avoidance system in radio frequency identification according to a fourth embodiment of the present invention, where the system includes: an information receiver 31 and an information sender 32.
The information receiver 31 includes: the device comprises a determining module and an information sending module;
the determining module is used for determining the feedback time slot according to the time slot selection information included in the first query command sent by the information sender and determining the identity identification information according to the effective identification number and the effective identification information included in the first query command;
the information sending module is used for sending the identity identification information to the information sender if the sending time slot in the second query command is equal to the feedback time slot after receiving the second query command so as to realize the anti-collision of the identity identification information through the feedback time slot;
the information sender 32 includes: the device comprises a first instruction sending module, a second instruction sending module and a receiving module;
the first instruction sending module is used for generating a first query command according to a preset query command format and sending the first query command to the information receiving party so that the information receiving party can determine the feedback time slot and the identity identification information according to the first query command;
the second instruction sending module is used for sending each second query command to the information receiver so that the information receiver sends the identity identification information when the sending time slot in the second query command is equal to the feedback time slot;
and the receiving module is used for receiving the identity recognition information fed back by the information receiving party so as to realize the anti-collision of the identity recognition information fed back by the information receiving party through the first query command.
The embodiment of the invention provides an information anti-collision system in radio frequency identification, which solves the problem that when an information sender inquires the identity information of an information receiver in radio frequency identification, the information receiver can not accurately identify information due to the fact that a plurality of information receivers send feedback information in the same time slot when the information receiver feeds back information to the information sender, the information receiver determines a feedback time slot by selecting information according to the time slot included in a first inquiry command, after receiving a second inquiry command, if the sending time slot in the second inquiry command is equal to the feedback time slot, the identity identification information is fed back to the information sender, because each information receiver can determine the own feedback time slot, the identity identification information can be sent only if the second inquiry command is just the own feedback time slot, and if not, the information collision caused by the fact that the information receivers all feed back the identity identification information in the same time slot is avoided, the anti-collision of the identity recognition information is realized. The method of the embodiment of the application associates the feedback time slot of the information receiving party with the ID value of the information receiving party, reduces functional modules of hardware, such as a random number module, solves the problem that the information receiving party cannot be identified all the time due to too many collisions when the information receiving party is too many, and avoids the limitation that many methods cannot be used due to the fact that the Type B radio frequency identification cannot detect bit collisions.
Further, the determining module is specifically configured to: determining each data bit in the time slot selection information; acquiring an identity identifier, and determining data corresponding to each data bit in the identity identifier; and determining a feedback time slot based on the value corresponding to each data.
Further, the determining module is specifically configured to: if the effective identification number is zero, taking an identity identifier as the identity identification information; otherwise, determining the effective bit information of the identity identifier according to the effective identification number; and if the effective identification information is equal to the effective bit information, taking the residual data without the effective identification information in the identity identifier as the identity identification information.
Further, the information sender 32 further includes:
the storage module is used for storing the identity identification information when receiving the identity identification information corresponding to the second query command;
and the updating module is used for determining that the sending time slot in the second query command is a conflict time slot when at least two pieces of identification information are received corresponding to the second query command, and updating the first query command so as to send a new first query command to the information receiving party until all pieces of identification information are obtained.
Further, the update module is specifically configured to: and when the number of effective identifications in the first query command is zero, updating the time slot selection information in the first query command according to the length of the identity identifier of the information receiver, and generating a new first query command.
Further, the update module is specifically configured to: when the effective identification number in the first query command is not zero, updating the effective identification number according to the length of time slot selection information in the first query command, updating the effective identification information in the first query command according to the conflict time slot, updating the time slot selection information according to the length of the identity identifier of the information receiver, and generating a new first query command.
The information anti-collision system in radio frequency identification provided by the embodiment of the invention can execute the information anti-collision method in radio frequency identification provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE five
Fig. 4 is a schematic structural diagram of an apparatus according to a fifth embodiment of the present invention, as shown in fig. 4, the apparatus includes a processor 40, a memory 41, an input device 42, and an output device 43; the number of processors 40 in the device may be one or more, and one processor 40 is taken as an example in fig. 4; the processor 40, the memory 41, the input means 42 and the output means 43 in the device may be connected by a bus or other means, as exemplified by the bus connection in fig. 4.
The memory 41 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the method for collision avoidance in radio frequency identification according to the embodiment of the present invention. The processor 40 executes various functional applications and data processing of the device by executing software programs, instructions and modules stored in the memory 41, namely, the above-mentioned information anti-collision method in radio frequency identification.
The memory 41 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 41 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 41 may further include memory located remotely from processor 40, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 42 is operable to receive input numeric or character information and to generate key signal inputs relating to user settings and function controls of the apparatus. The output device 43 may include a display device such as a display screen.
EXAMPLE six
The sixth embodiment of the present invention further provides a storage medium containing computer-executable instructions, where the computer-executable instructions are executed by a computer processor to perform the method for preventing collision of information in radio frequency identification according to the first embodiment of the present invention or according to the second embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the information anti-collision system in radio frequency identification, each included unit and module are only divided according to functional logic, but are not limited to the above division, as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An information anti-collision method in radio frequency identification is characterized in that the method is applied to an information receiver and comprises the following steps:
determining a feedback time slot according to time slot selection information included in a first query command sent by an information sender and determining identity identification information according to the effective identification number and the effective identification information included in the first query command;
and after receiving a second query command, if the sending time slot in the second query command is equal to the feedback time slot, sending the identity identification information to the information sender so as to realize the anti-collision of the identity identification information through the feedback time slot.
2. The method of claim 1, wherein determining the feedback time slot according to the time slot selection information in the received first query command comprises:
determining each data bit in the time slot selection information;
acquiring an identity identifier, and determining data corresponding to each data bit in the identity identifier;
and determining a feedback time slot based on the value corresponding to each data.
3. The method of claim 1, wherein determining the identification information according to the valid identification number and the valid identification information included in the first query command comprises:
if the effective identification number is zero, taking an identity identifier as the identity identification information; otherwise, determining the effective bit information of the identity identifier according to the effective identification number;
and if the effective identification information is equal to the effective bit information, taking the residual data without the effective identification information in the identity identifier as the identity identification information.
4. An information anti-collision method in radio frequency identification is characterized in that the method is applied to an information sender and comprises the following steps:
generating a first query command according to a preset query command format, and sending the first query command to an information receiver so that the information receiver determines a feedback time slot and identity identification information according to the first query command;
sending each second query command to the information receiver so that the information receiver sends the identification information when the sending time slot in the second query command is equal to the feedback time slot;
and receiving the identity recognition information fed back by the information receiver so as to realize the anti-collision of the identity recognition information fed back by the information receiver through the first query command.
5. The method of claim 4, further comprising:
when receiving an identification information corresponding to the second query command, storing the identification information;
when at least two pieces of identification information are received corresponding to the second query command, determining that a sending time slot in the second query command is a conflict time slot, and updating the first query command so as to send a new first query command to the information receiver until all the identification information is acquired.
6. The method of claim 5, wherein the updating the first query command comprises:
and when the number of effective identifications in the first query command is zero, updating the time slot selection information in the first query command according to the length of the identity identifier of the information receiver, and generating a new first query command.
7. The method of claim 5, wherein the updating the first query command comprises:
when the effective identification number in the first query command is not zero, updating the effective identification number according to the length of time slot selection information in the first query command, updating the effective identification information in the first query command according to the conflict time slot, updating the time slot selection information according to the length of the identity identifier of the information receiver, and generating a new first query command.
8. An information anti-collision system in radio frequency identification, comprising: an information receiver and an information sender;
the information receiver comprises: the device comprises a determining module and an information sending module;
the determining module is used for determining a feedback time slot according to time slot selection information included in a first query command sent by an information sender and determining identity identification information according to the number of effective identifications and the effective identification information included in the first query command;
the information sending module is configured to send the identification information to the information sender after receiving a second query command and if a sending time slot in the second query command is equal to the feedback time slot, so as to achieve collision prevention on the identification information through the feedback time slot;
the information sender comprises: the device comprises a first instruction sending module, a second instruction sending module and a receiving module;
the first instruction sending module is used for generating a first query command according to a preset query command format and sending the first query command to an information receiving party so that the information receiving party can determine a feedback time slot and identity identification information according to the first query command;
a second instruction sending module, configured to send each second query command to the information receiving party, so that the information receiving party sends the identification information when a sending time slot in the second query command is equal to the feedback time slot;
and the receiving module is used for receiving the identity recognition information fed back by the information receiving party so as to realize the anti-collision of the identity recognition information fed back by the information receiving party through the first query command.
9. An apparatus, characterized in that the apparatus comprises:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the method for collision avoidance of information in radio frequency identification as recited in any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements a method for collision avoidance of information in radio frequency identification according to any one of claims 1 to 7.
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