CN102542218B - Method and system for transmitting radio frequency identification (RFID) data, and hardware platform for RFID label - Google Patents

Abstract

The present invention provides a method and system for radio frequency identification data transmission and a hardware platform for RFID tags, which belong to the field of wireless data service communication of the Internet of Things. During the request message, according to the request message, start the radio frequency identification RFID data transmission, the hardware platform of the RFID tag transmits the RFID data to the RFID reader; When the request message is received, the hardware platform of the RFID tag automatically starts the RFID data transmission, and transmits the RFID data to the RFID reader. During the RFID data transmission process, the transmission mode of the hardware platform of the RFID tag can be automatically switched between the active transmission mode and the passive transmission mode, effectively reducing the power consumption generated during the RFID data transmission process.

Description

Method and system for radio frequency identification data transmission and hardware platform for RFID tags

technical field

The invention belongs to the field of Internet of Things wireless data service communication, and in particular relates to a method and system for RFID (Radio Frequency Identification) data transmission and a hardware platform for RFID tags.

Background technique

In recent years, the development of sensor technology, RFID technology, wireless sensor network technology and mobile communication technology has caused a revolution in many fields. The realization of arbitrary wireless interconnection and intercommunication based on micro-terminal equipment is becoming a new high-tech research hotspot and market investment hotspot, and the information construction and management of various urban pipe networks are no exception.

In the RFID system, signal transmitters exist in different forms for different application purposes, and the typical form is a tag (TAG). The label is equivalent to the barcode symbol in the barcode technology, which is used to store the information that needs to be identified and transmitted. In addition, different from the barcode, the label must be able to automatically transmit the stored information automatically or under the action of external force. Tags are generally low-power integrated circuits with coils, antennas, memory and control systems. According to the different ways in which tags obtain electrical energy, tags can be divided into active tags and passive tags.

The RFID unit that actively transmits radio frequency signals is called an active tag. The active tag has its own internal battery for power supply. The active tag has sufficient power, high reliability, and a long distance for signal transmission. The main disadvantage of active tags is that the service life of the tag is limited, and with the consumption of battery power in the tag, the distance of data transmission will become smaller and smaller, which will affect the normal operation of the system.

The RFID unit that actively transmits radio frequency signals is called a passive tag. The passive tag does not have a battery inside, and it depends on the energy provided by the outside to work normally. Typical devices for generating electric energy in passive tags are antennas and coils. When the tags enter the working area of the system and the antenna receives specific electromagnetic waves, the coils will generate an induced current, which then supplies power to the tags through a rectification circuit. Passive tags have a permanent service life and are often used in places where tag information needs to be read and written every day or frequently read and written multiple times, and passive tags support long-term data transmission and permanent data storage. The disadvantage of passive tags is mainly that the distance of data transmission is shorter than that of active tags. Because passive tags rely on external electromagnetic induction for power supply, their power is relatively weak, and the distance of data transmission and signal strength are limited. A more sensitive signal receiver (RFID reader) is required for reliable reading.

Although there are currently some applications of active RFID technology, the main transmission method of the tag is: active transmission of radio frequency signals, and long-term selection of this transmission method will definitely generate a lot of power consumption, and it is not very useful for low-power products. Promote apps.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a method for radio frequency identification data transmission, a system and a hardware platform of RFID tags, which realizes that in the process of RFID data transmission, the transmission mode of the hardware platform of RFID tags can be in the active transmission mode Automatically switch between passive and passive transmission modes, effectively reducing power consumption during RFID data transmission.

In order to achieve the above object, the present invention provides a method for radio frequency identification data transmission, said method comprising:

When the hardware platform of the radio frequency identification RFID tag receives the request message from the radio frequency identification RFID reader, according to the request message, start the radio frequency identification RFID data transmission, and the hardware platform of the RFID tag transmits the RFID data to the RFID reader;

When the hardware platform of the RFID tag does not receive a request message from the RFID reader within a predetermined period of time, the hardware platform of the RFID tag automatically starts RFID data transmission, and transmits the RFID data to the RFID reader.

Preferably, the step of starting radio frequency identification RFID data transmission according to the request message specifically includes:

According to the request message, wake up the microcontroller in the hardware platform of the RFID tag;

The microcontroller controls the sensor in the hardware platform of the RFID tag to collect RFID data;

After the RFID data collection is completed, the sensor is turned off.

Preferably, after the hardware platform of the RFID tag transmits the RFID data to the RFID reader, the method further includes:

After the RFID data transmission is completed, the microcontroller enters a dormant state.

Preferably, the step of automatically starting the RFID data transmission of the hardware platform of the RFID tag specifically includes:

Automatically wake up the microcontroller in the hardware platform of the RFID tag;

The microcontroller controls the sensor in the hardware platform of the RFID tag to collect RFID data; after the RFID data collection is completed, the sensor is turned off.

Preferably, after the step of transmitting the RFID data to the RFID reader, the method further includes:

After the RFID data transmission is completed, the microcontroller enters into a dormant state and starts the next round of timing.

Preferably, the method also includes:

Presetting the working mode of the RFID reader, the working mode includes: active request mode and passive receiving mode, wherein

When the working mode of the RFID reader is the active request mode, within the predetermined time period, the RFID reader sends the request message to the hardware platform of the RFID tag.

Preferably, the method also includes:

When the working mode of the RFID reader is the passive receiving mode, the RFID reader cyclically receives the RFID data sent by the hardware platform of the RFID tag.

In order to achieve the above object, the present invention also provides a system for radio frequency identification data transmission, including: a hardware platform of the RFID tag and an RFID reader, the hardware platform of the RFID tag is used for receiving a request message from the RFID reader , start RFID data transmission according to the request message, and transmit the RFID data to the RFID reader; The data is transmitted to the RFID reader.

Preferably, the hardware platform of the RFID tag includes:

A sensor for collecting RFID data;

The tag microcontroller is connected with the sensor, and is used to start RFID data transmission according to the request message when receiving the request message from the RFID reader, and transmit the RFID data collected by the sensor to the RFID reader and, when the request message from the RFID reader is not received within a predetermined period of time, automatically start the RFID data transmission, and transmit the RFID data collected by the sensor to the RFID reader;

A tag antenna connected to the tag microcontroller for wireless communication with the RFID reader;

The tag power supply module is connected with the sensor and the tag microcontroller, and is used to supply power to the sensor and the tag microcontroller.

Preferably, the RFID reader includes:

A reader antenna for wireless communication with the hardware platform of the RFID tag;

The reader microcontroller is connected to the reader antenna and is used to preset the working mode of the RFID reader, the working mode includes: active request mode and passive receiving mode, when the working mode of the RFID reader When it is an active request mode, within the predetermined time period, send the request message to the hardware platform of the RFID tag; when the working mode of the RFID reader is a passive receiving mode, cyclically receive the RFID tag RFID data sent by the hardware platform;

An external communication interface, connected to the reader microcontroller, for forwarding the RFID data to an external device;

The reader power supply module is connected with the reader antenna, the reader microcontroller and the external communication interface, and is used to supply power to the reader antenna, the reader microcontroller and the external communication interface.

In order to achieve the above object, the present invention also provides a hardware platform for RFID tags, including:

A sensor for collecting RFID data;

The tag microcontroller is connected with the sensor, and is used to start RFID data transmission according to the request message when receiving the request message from the RFID reader, and transmit the RFID data collected by the sensor to the RFID reader and, when the request message from the RFID reader is not received within a predetermined period of time, automatically start the RFID data transmission, and transmit the RFID data collected by the sensor to the RFID reader;

A tag antenna connected to the tag microcontroller for wireless communication with the RFID reader;

The tag power supply module is connected with the sensor and the tag microcontroller, and is used to supply power to the sensor and the tag microcontroller.

As can be seen from the above technical solution, the embodiments of the present invention have the following beneficial effects: when the hardware platform of the RFID tag receives a request message from the RFID reader, the RFID data transmission is started according to the request message, and the hardware platform of the RFID tag transfers the RFID data Transmission to the RFID reader; when the hardware platform of the RFID tag does not receive a request message from the RFID reader within a predetermined period of time, the hardware platform of the RFID tag automatically starts the RFID data transmission, and transmits the RFID data to the RFID reader, In the process of RFID data transmission, the transmission mode of the hardware platform of the RFID tag can be automatically switched between the active transmission mode and the passive transmission mode, effectively reducing the power consumption generated during the RFID data transmission process. The RFID data transmission mode It can serve the field of online monitoring of urban pipelines for a long time.

Description of drawings

Fig. 1 is the method flowchart of RFID data transmission in the embodiment of the present invention;

Fig. 2 is the flowchart of the hardware platform passive transmission mode of RFID tag in the embodiment of the present invention;

Fig. 3 is the flowchart of the active transmission mode of the hardware platform of RFID tag in the embodiment of the present invention;

Fig. 4 is the flowchart of the reading data of RFID reader in the embodiment of the present invention;

Fig. 5 is the structural representation of the hardware platform of RFID tag in the embodiment of the present invention;

Fig. 6 is a schematic structural diagram of an RFID reader in an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

Referring to Fig. 1, it is the method flowchart of RFID data transmission in the embodiment of the present invention, and concrete steps are as follows:

Step 101. Determine whether the hardware platform of the RFID tag receives a request message from the RFID reader within a predetermined period of time? If yes, execute step 102; otherwise, execute step 103;

Step 102, when the hardware platform of the RFID tag receives the request message from the RFID reader, start RFID data transmission according to the request message, and the hardware platform of the RFID tag transmits the RFID data to the RFID reader;

When the hardware platform of the RFID tag receives the request message, the request message can wake up the microcontroller on the hardware platform of the RFID tag, and the microcontroller starts the RFID data transmission process. This RFID data transmission method can be called a passive transmission method of RFID data.

In this embodiment, the above-mentioned request message may be a polling message sent by the RFID reader to the hardware platform of the RFID tag. .

Step 103: When the hardware platform of the RFID tag does not receive a request message from the RFID reader within a predetermined period of time, the hardware platform of the RFID tag automatically starts RFID data transmission, and transmits the RFID data to the RFID reader.

When the hardware platform of the RFID tag does not receive a request message from the RFID reader within a predetermined period of time, the hardware platform of the RFID tag automatically starts RFID data transmission. This RFID data transmission method can be called an active transmission method of RFID data.

In this embodiment, the hardware platform of the RFID tag can be clocked by a timer to determine whether a request message from the RFID reader is received within a predetermined period of time, and the predetermined time is not limited in this embodiment The specific range of the segment can be adjusted according to the specific situation.

Steps 101 to 103 describe the RFID data transmission process on the hardware platform side of the RFID tag. Correspondingly, the above method also includes the RFID data transmission process on the RFID reader side, and the specific steps are as follows:

The working mode of the RFID reader is preset, and the working mode includes: active request mode and passive receiving mode, wherein

When the working mode of the RFID reader is an active request mode, within the predetermined time period, the RFID reader sends a request message to the hardware platform of the RFID tag;

When the working mode of the RFID reader is the passive receiving mode, the RFID reader cyclically receives the RFID data sent by the hardware platform of the RFID tag.

In this embodiment, the transmission mode of RFID data can be automatically switched between the active transmission mode and the passive transmission mode by performing the above steps. This switching method can be achieved by setting a timing variable parameter on the hardware platform of the RFID tag to realize the automatic switching of the two transmission methods.

For example, the system defaults in the passive transmission mode of RFID data transmission between the hardware platform of the RFID tag and the RFID reader. When the hardware platform of the RFID tag does not receive the request message within a predetermined period of time, the MCU in the hardware platform of the RFID tag (microcontroller) will be automatically woken up, and start the sensor in the hardware platform of the RFID tag and read the RFID data, and then pass the tag ID of the hardware platform of the RFID tag and the collected RFID data through the antenna of the hardware platform of the RFID tag Send out, so as to realize automatic switching from passive transmission mode to active transmission mode.

The following will introduce the hardware platform of the RFID tag and the RFID reader in combination with the specific process, and the workflow in the active transmission mode and the passive transmission mode.

Referring to Fig. 2, it is the flowchart of the hardware platform passive transmission mode of RFID tag in the embodiment of the present invention, and concrete steps are as follows:

Step 201, receiving the request message sent by the RFID reader;

For example: the request message may be a polling message for RFID data.

Step 202, wake up the MCU in the hardware platform of the RFID tag;

By receiving the request message from the RFID reader, the MCU in the hardware platform of the RFID tag is woken up. The MCU is used to control each module in the hardware platform of the RFID tag, and completes the control and management of the relevant data of each module.

Step 203, the MCU controls the sensor in the hardware platform that starts the RFID tag;

In this embodiment, the sensor can fully cover various types of sensor devices or other inductive and conductive components, and is used for sensing and collecting relevant state data of external measured objects.

Step 204, the sensor in the hardware platform of the RFID tag performs RFID data collection;

Step 205, the MCU performs corresponding processing on the RFID data collected by the sensor;

Step 206, cache the processed RFID data;

For example, a storage module (such as a flash memory module) can be set in the hardware platform of the RFID tag to cache the RFID data.

Step 207, the MCU controls to turn off the sensor;

Step 208, the antenna in the hardware platform of the RFID tag sends the ID number and RFID data of the RFID tag to the RFID card reader;

Step 209, after the RFID data transmission is completed, the MCU enters into a dormant state.

In steps 201-209, the passive transmission mode of the RFID data of the hardware platform of the RFID tag is introduced. In the passive transmission mode of the hardware platform of the RFID tag, it mainly sends a request message through the RFID reader, couples with the antenna of the hardware platform of the RFID tag, and provides relevant working energy to wake up the MCU in the hardware platform of the RFID tag, and then The MCU controls the sensor to collect RFID data, and the MCU performs corresponding processing according to the RFID data collected by the sensor, and then sends the ID number and RFID data of the RFID tag to the RFID reader through the antenna. In this way, the hardware platform of the RFID tag can always be in a dormant state, which provides a guarantee for the long-term operation of the system.

Referring to Fig. 3, it is the flow chart of the active transmission mode of the hardware platform of RFID tag in the embodiment of the present invention, and concrete steps are as follows:

Step 301, timer switching;

That is, when no request message from the RFID reader is received within a predetermined period of time, switch the transmission mode from the passive transmission mode to the active transmission mode, and then perform step 302;

In this embodiment, the timer can be integrated and set in the MCU.

Step 302, wake up the MCU in the hardware platform of the RFID tag;

Step 303, the MCU controls the sensor in the hardware platform that starts the RFID tag;

Step 304, the sensor in the hardware platform of the RFID tag performs data collection;

Step 305, the MCU processes the data collected by the sensor;

Step 306, the MCU controls to turn off the sensor;

Step 307, the antenna in the hardware platform of the RFID tag sends the ID and RFID data of the RFID tag to the RFID card reader;

Step 308, after the RFID data transmission is completed, the MCU enters a dormant state;

Step 309, start a timer.

That is, after the data transmission is completed, the MCU enters into a dormant state and starts the next round of timing.

In steps 301-309, the active transmission mode of the RFID data of the hardware platform of the RFID tag is introduced. In the active transmission mode of the hardware platform of the RFID tag, when the hardware platform of the RFID tag does not receive a request message within a predetermined period of time (timer control), it will automatically wake up the MCU in the hardware platform of the RFID tag, and pass the power-on sensor , so that the sensor collects RFID data, the collected RFID data is processed by the MCU, and the ID number of its own RFID tag is integrated with the RFID data, and sent out through the antenna in the hardware platform of the RFID tag, and then the MCU automatically enters a sleep state, and Start the next round of timing.

If during this period, the hardware platform of the RFID tag receives the request message from the RFID reader, it will automatically terminate the active transmission mode and replace it with a passive transmission mode.

In this embodiment, in order to ensure the low power consumption characteristics of the system, the hardware platform of the RFID tag usually adopts a passive transmission mode, but at the same time, in order to avoid the hardware platform of the RFID tag not receiving the RFID request message for a long time, and lose relevant important time points The data collection can be automatically switched through the transmission mode of the hardware platform of the RFID tag, that is, the passive transmission mode is automatically switched to the active transmission mode, so as to achieve the purpose of intelligent transmission and monitoring of RFID data.

As shown in Figure 4, it is the flowchart of reading RFID data of RFID reader in the embodiment of the present invention, and concrete steps are as follows:

Step 401, initialize the RFID reader;

Step 402, setting the working mode of the RFID reader, if the working mode is active request mode, then perform step 403; if the working mode is passive receiving mode, then perform step 408;

In this embodiment, the working modes of the RFID reader include: an active request mode and a passive receiving mode, wherein the active request mode refers to that the RFID reader actively sends a request message (poll message) to the hardware platform of the RFID tag; passive receiving The mode means that the RFID reader does not send a request message to the hardware platform of the RFID tag, but passively receives the RFID data from the hardware platform of the RFID tag.

Step 403, initialize the timer;

The initializing the timer may refer to clearing the timer.

Step 404, determine whether the timer expires, if so, execute step 405; otherwise, continue to execute step 404;

Step 405, the RFID reader sends a polling message to the hardware platform of the RFID tag;

That is, the RFID reader sends a request message to the hardware platform of the RFID tag every predetermined time interval;

Step 406, the RFID reader obtains the RFID data from the hardware platform of the RFID tag;

Step 407, save the RFID data, or send it to the destination through the external communication interface, and then return to step 404;

In this embodiment, the external communication interface mainly realizes data forwarding with external devices, and the external interface is a general serial communication interface, such as: TTL USART port, RS-232 serial port, RS-485 serial port, USB interface, Ethernet network interface, etc. Through different types of interfaces, different connection devices can be configured to facilitate the expansion and application of RFID readers.

Step 408, the RFID reader sets a communication address;

Step 409, start the passive receiving mode;

Step 410, the RFID reader receives the RFID data from the hardware platform of the RFID tag;

Step 411 , save the RFID data, or send it to the destination through the external communication interface, and then return to step 409 .

Steps 401 to 411 describe the process of reading RFID data by the RFID reader. First, the RFID reader is initialized and the working mode of the RFID reader is set. If it is the active request mode, the RFID reader can set a timer timing and related active polling naming byte code, and then start the timing function of the timer, according to the pre-set RFID read and write commands, periodically send to the RFID reader with the sensor The hardware platform of the tag performs polling operation; if it is passive receiving mode, the hardware platform of the RFID tag needs to set a communication address, and then start the passive receiving mode to receive the RFID data sent by the hardware platform of the RFID tag cyclically.

In an embodiment of the present invention, a system for radio frequency identification data transmission is also provided, including: a hardware platform of an RFID tag and an RFID reader, wherein the hardware platform of the RFID tag is used for receiving a request from the RFID reader message, start RFID data transmission according to the request message, and transmit the RFID data to the RFID reader; and, when not receiving a request message from the RFID reader within a predetermined time period, automatically start the RFID data transmission , to transmit the RFID data to the RFID reader.

Referring to Fig. 5, it is a schematic structural diagram of the hardware platform of the RFID tag in an embodiment of the present invention, as can be seen from the figure, the hardware platform of the RFID tag includes:

Sensor 51, for collecting RFID data;

The label micro-controller 52 is connected with the sensor 51, and is used to start RFID data transmission according to the request message when receiving the request message from the RFID reader, and transmit the RFID data collected by the sensor to An RFID reader; and, when no request message from the RFID reader is received within a predetermined period of time, automatically start RFID data transmission, and transmit the RFID data collected by the sensor to the RFID reader;

A tag antenna 53 is connected with the tag microcontroller 52 for wireless communication with the RFID reader;

The tag power supply module 54 is connected with the sensor 51 and the tag microcontroller 52 for supplying power to the sensor 51 and the tag microcontroller 52 .

In an embodiment of the present invention, the hardware platform of the RFID tag further includes: an analog/digital conversion module 55 and an input/output module 56, and the analog/digital conversion module 55 is used to realize data conversion between analog signals and digital signals , and complete the basic input/output operation of data through the input/output module 56.

In the embodiment of the present invention, the hardware platform of the RFID tag further includes: a crystal oscillator module 57, which is used to provide a clock signal to the hardware platform of the RFID tag, so as to realize synchronous collection of data and synchronous operation of related communication.

In the embodiment of the present invention, the hardware platform of the RFID tag further includes: a flash memory module 58, which is used for caching the RFID data collected by the sensor 51.

Referring to Fig. 6, it is a schematic structural diagram of an RFID reader in an embodiment of the present invention, as can be seen from the figure, the RFID reader includes:

The reader antenna 61 is used for wireless communication with the hardware platform of the RFID tag;

The reader microcontroller 62 is connected with the reader antenna 61 and is used to preset the working mode of the RFID reader. The working mode includes: active request mode and passive receiving mode, when the RFID reader's When the working mode is the active request mode, within the predetermined time period, send the request message to the hardware platform of the RFID tag; when the working mode of the RFID reader is the passive receiving mode, cyclically receive the RFID RFID data sent by the hardware platform of the tag;

An external communication interface 63, connected to the reader microcontroller 62, for forwarding the RFID data to an external device;

Reader power supply module 64, is connected with described reader antenna 61, described reader microcontroller 62 and external communication interface 63, is used for described reader antenna 61, described reader microcontroller 62 and described reader The external communication interface 63 supplies power.

In the embodiment of the present invention, the RFID reader further includes: a flash memory module 64 for buffering the RFID data collected by the reader antenna 61 .

In the embodiment of the present invention, the RFID reader further includes: a crystal oscillator module 65, which is used to provide a clock signal to the RFID reader to realize synchronous collection of data and synchronous operation of related communications.

Also provide a kind of hardware platform of RFID label in the embodiment of the present invention, comprise:

A sensor for collecting RFID data;

The tag microcontroller is connected with the sensor, and is used to start RFID data transmission according to the request message when receiving the request message from the RFID reader, and transmit the RFID data collected by the sensor to the RFID reader and, when the request message from the RFID reader is not received within a predetermined period of time, automatically start the RFID data transmission, and transmit the RFID data collected by the sensor to the RFID reader;

A tag antenna connected to the tag microcontroller for wireless communication with the RFID reader;

The tag power supply module is connected with the sensor and the tag microcontroller, and is used to supply power to the sensor and the tag microcontroller.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (9)

1. a method for radio frequency identification data transmission, it is characterized in that, described method comprises:

Judge whether the hardware platform of RFID label tag receives the request message from RFID reader within a predetermined period of time, the described request message polling message that to be RFID reader send to the hardware platform of RFID label tag;

When the hardware platform of radio frequency identification (RFID) labels receives the request message from radio frequency discrimination RFID reader, according to described request message, start the transmission of radio frequency discrimination RFID data, RFID data is transferred to RFID reader by the hardware platform of RFID label tag;

When the hardware platform of RFID label tag does not receive the request message from RFID reader within a predetermined period of time, the hardware platform of RFID label tag starts RFID data transmission automatically, and RFID data is transferred to RFID reader;

Wherein, described according to described request message, the step starting the transmission of radio frequency discrimination RFID data specifically comprises: according to described request message, wake the microcontroller in the hardware platform of described RFID label tag up; Sensor in the hardware platform of RFID label tag described in described microprocessor controls carries out the collection of RFID data; After described RFID data collection completes, close described sensor;

The step that the hardware platform of described RFID label tag starts RFID data transmission automatically specifically comprises: automatically wake the microcontroller in the hardware platform of described RFID label tag up; Sensor in the hardware platform of RFID label tag described in described microprocessor controls carries out the collection of RFID data; After described RFID data collection completes, close described sensor.

2. method according to claim 1, is characterized in that, after RFID data is transferred to the step of RFID reader by the hardware platform of described RFID label tag, described method also comprises:

After described RFID data is transmitted, described microcontroller enters into dormant state.

3. method according to claim 1, is characterized in that, described RFID data is transferred to the step of RFID reader after, described method also comprises:

After described RFID data is transmitted, described microcontroller enters into dormant state, and starts next round timing.

4. method according to claim 1, is characterized in that, described method also comprises:

Pre-set the mode of operation of described RFID reader, described mode of operation comprises: active request pattern and passive receiving mode, wherein

When the mode of operation of described RFID reader is active request pattern, in described predetermined amount of time, described RFID reader sends described request message to the hardware platform of described RFID label tag.

5. method according to claim 4, is characterized in that, described method also comprises:

When the mode of operation of described RFID reader is passive receiving mode, the RFID data that the hardware platform that described RFID reader circulation receives described RFID label tag sends.

6. the system of a radio frequency identification data transmission, comprise: the hardware platform of RFID label tag and RFID reader, it is characterized in that, the hardware platform of described RFID label tag, for judging the request message whether received within a predetermined period of time from RFID reader, the described request message polling message that to be RFID reader send to the hardware platform of RFID label tag; When receiving the request message from RFID reader, according to described request message, wake the microcontroller in the hardware platform of described RFID label tag up; Sensor in the hardware platform of RFID label tag described in described microprocessor controls carries out the collection of RFID data; RFID data is transferred to RFID reader, after described RFID data collection completes, closes described sensor; And, when not receiving the request message from RFID reader within a predetermined period of time, automatically wake the microcontroller in the hardware platform of described RFID label tag up; Sensor in the hardware platform of RFID label tag described in described microprocessor controls carries out the collection of RFID data; RFID data is transferred to RFID reader; After described RFID data collection completes, close described sensor.

7. system according to claim 6, is characterized in that, the hardware platform of described RFID label tag comprises:

Sensor, for gathering RFID data;

Label microcontroller, be connected with described sensor, for judging the request message whether received within a predetermined period of time from RFID reader, the described request message polling message that to be RFID reader send to the hardware platform of RFID label tag, when receiving the request message from RFID reader, according to described request message, start RFID data transmission, the described RFID data gathered by described sensor is transferred to RFID reader; And for when not receiving the request message from RFID reader within a predetermined period of time, automatically start RFID data transmission, the described RFID data gathered by described sensor is transferred to RFID reader;

Label antenna, is connected with described label microcontroller, for carrying out radio communication with RFID reader;

Tag-powered module, is connected with described sensor and described label microcontroller, for powering to described sensor and described label microcontroller.

8. system according to claim 6, is characterized in that, described RFID reader comprises:

Reader antenna, for carrying out radio communication with the hardware platform of described RFID label tag;

Reader microcontroller, be connected with described reader antenna, for pre-setting the mode of operation of described RFID reader, described mode of operation comprises: active request pattern and passive receiving mode, when the mode of operation of described RFID reader is active request pattern, in described predetermined amount of time, the hardware platform to described RFID label tag sends described request message; When the mode of operation of described RFID reader is passive receiving mode, the RFID data that the hardware platform that circulation receives described RFID label tag sends;

External communication interface, is connected with described reader microcontroller, forwards described RFID data for external device;

Reader supply module, is connected with described reader antenna, described reader microcontroller and external communication interface, for powering to described reader antenna, described reader microcontroller and described external communication interface.

9. a hardware platform for RFID label tag, is characterized in that, comprising:

Sensor, for gathering RFID data;

Label microcontroller, be connected with described sensor, for judging the request message whether received within a predetermined period of time from RFID reader, the described request message polling message that to be RFID reader send to the hardware platform of RFID label tag, when receiving the request message from RFID reader, according to described request message, wake the microcontroller in the hardware platform of described RFID label tag up; Sensor in the hardware platform of RFID label tag described in described microprocessor controls carries out the collection of RFID data, and the described RFID data gathered by described sensor is transferred to RFID reader, after described RFID data collection completes, closes described sensor; And, for when not receiving the request message from RFID reader within a predetermined period of time, automatically wake the microcontroller in the hardware platform of described RFID label tag up; Sensor in the hardware platform of RFID label tag described in described microprocessor controls carries out the collection of RFID data, and the described RFID data gathered by described sensor is transferred to RFID reader; After described RFID data collection completes, close described sensor;

Label antenna, is connected with described label microcontroller, for carrying out radio communication with RFID reader;

Tag-powered module, is connected with described sensor and described label microcontroller, for powering to described sensor and described label microcontroller.