WO2012022082A1 - 射频识别方法和阅读器 - Google Patents

射频识别方法和阅读器 Download PDF

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Publication number
WO2012022082A1
WO2012022082A1 PCT/CN2010/079008 CN2010079008W WO2012022082A1 WO 2012022082 A1 WO2012022082 A1 WO 2012022082A1 CN 2010079008 W CN2010079008 W CN 2010079008W WO 2012022082 A1 WO2012022082 A1 WO 2012022082A1
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WIPO (PCT)
Prior art keywords
reader
adjacent
busy
antenna
collision antenna
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Application number
PCT/CN2010/079008
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English (en)
French (fr)
Inventor
刘朝阳
程亮
赵董兴
Original Assignee
中兴通讯股份有限公司
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Publication of WO2012022082A1 publication Critical patent/WO2012022082A1/zh

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
    • G06K7/10079—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
    • G06K7/10475—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications arrangements to facilitate interaction with further interrogation devices, e.g. such that at least two interrogation devices may function and cooperate in a network of such devices

Definitions

  • the present invention relates to the field of radio frequency identification technologies, and in particular, to a radio frequency identification method and a reader. Background technique
  • the RFID (Radio Frequency Identification) system includes tags and readers.
  • RFID technology is a non-contact automatic identification technology that uses radio frequency signals to identify the target object and obtain relevant data from the target object. This identification operation can be applied to a variety of harsh environments without manual intervention. At the same time, RFID technology can identify high-speed moving objects, and can identify multiple tags at the same time, which is convenient and quick to operate.
  • Existing RFID systems include: Passive RFID systems and active RFID systems. The difference between the two is that the former's tag takes energy from the reader's transmit waveform, and the latter's tag has its own energy supply.
  • the passive RFID system is taken as an example to introduce the working principle of the RFID system.
  • the reader first encodes the data information, amplitude shift keying (ASK) modulation to form a radio frequency carrier signal, and then transmits the radio frequency carrier signal to one or more tags over the wireless channel.
  • the reader sends a continuous RF carrier signal to the tag, which provides energy to the tag and backfires the information returned by the tag.
  • the communication between the reader and the tag is a half-duplex mode.
  • the existing radio frequency technology is widely used in various fields, such as the application of electronic license plate recognition.
  • two readers are generally used to identify the electronic license plate, and the two readers are respectively connected.
  • 4 antennas identify the car tags of 8 lanes, and write relevant data information into the car tag.
  • the actual operation mode of each reader is to poll 4 antennas, and count, read and write the car tags of the corresponding lanes of each antenna.
  • Two The carrier frequencies of all the antennas in the reader are the same. If the antennas of the two readers transmitting RF information at the same time are adjacent antennas, they will be interfered when the vehicle tags return information. As a result, some car tags leak or fail to read and write successfully, and the recognition rate is low. Summary of the invention
  • the main object of the present invention is to provide a radio frequency identification method and a reader to improve the success rate of radio frequency identification.
  • a radio frequency identification method includes the steps of: querying whether a second collision antenna adjacent to a first collision antenna of the reader in an adjacent reader is busy; when the second collision antenna is idle, transmitting to an adjacent reader Busy information; sends radio frequency information to the first collision antenna into the tag recognition operation.
  • the method further includes: transmitting the idle information to the adjacent reader.
  • the method further includes: when the second collision antenna is busy, after the second collision antenna is busy , Send busy messages to adjacent readers.
  • the method further includes: when the second collision antenna is busy, after the second collision antenna is busy timeout , Send busy messages to adjacent readers.
  • the step of transmitting the busy information to the adjacent reader when the second collision antenna is idle includes: when the second collision antenna When idle, the second collision antenna is queried again after the set time; if the second collision antenna is still idle, the busy information is sent to the adjacent reader.
  • the query is whether the second collision antenna adjacent to the first collision antenna of the reader is busy before the query is busy. Includes: Sending busy messages to adjacent readers.
  • the reader and the adjacent reader are connected by a universal input/output line; the reader outputs a high/low level to the adjacent reader through a universal input/output line to indicate the reader Send free/busy information to an adjacent reader.
  • a reader including:
  • a query module configured to query whether a second collision antenna adjacent to the first collision antenna in the reader is busy in an adjacent reader
  • a sending module configured to send busy information to an adjacent reader when the second collision antenna is idle
  • the identification module is configured to send the radio frequency information into the label recognition operation after transmitting the busy information to the adjacent reader.
  • the sending module is further configured to:
  • the busy information is sent to the adjacent reader; or, when the second collision antenna is busy, after the second collision antenna is busy, the neighboring The reader sends a busy message;
  • the idle information is sent to the adjacent reader.
  • the sending module is further configured to: when the second collision antenna is idle, pass the query module again after the set time Query whether the second collision antenna is busy. If the second collision antenna is still idle, send busy information to the adjacent reader.
  • the sending module is further configured to: query the first reader and the reader in the adjacent reader through the query module A busy message is sent to an adjacent reader before the second collision antenna adjacent to the collision antenna is busy.
  • the reader and the adjacent reader are connected by a universal input and output line;
  • the reader outputs a high/low level to the adjacent reader through a general-purpose input/output line to indicate that the reader transmits idle/busy information to an adjacent reader.
  • the radio frequency identification method and the reader provided by the present invention, when the second collision antenna is idle in an adjacent reader, notify the first collision antenna in the reader that the first collision antenna is ready to work by sending a busy message to the adjacent reader, and then The radio frequency information is sent to the first collision antenna to enter the label recognition operation, which avoids the adjacent collision antennas in the adjacent readers from entering the working state, thereby causing the radio frequency identification to be interfered, and the success rate of the radio frequency identification is improved.
  • FIG. 1 is a schematic diagram of a working principle of a reader for identifying a tag in the prior art
  • FIG. 2 is a schematic flowchart of an embodiment of a radio frequency identification method according to the present invention
  • FIG. 3 is a schematic flow chart of another embodiment of a video recognition method of the present invention.
  • FIG. 4 is a schematic flow chart of another embodiment of a radio frequency identification method according to the present invention.
  • FIG. 5 is a block diagram showing an embodiment of a reader of the present invention. detailed description
  • the reader and the adjacent reader according to the present invention are respectively provided with a plurality of antennas for transmitting radio frequency information for tag identification operation, wherein the antenna adjacent to the adjacent reader in the reader, and the phase
  • the antenna adjacent to the reader in the adjacent reader is an adjacent antenna, that is, a collision antenna.
  • the antenna adjacent to the adjacent reader in the reader is the first collision antenna
  • the antenna adjacent to the reader in the adjacent reader is the second collision antenna.
  • the reader is connected to an adjacent reader through a general-purpose input/output (GPIO) line; the reader outputs a high/low level to an adjacent reader through the GPIO line. To indicate that the reader sends idle/busy information to an adjacent reader. Similarly, the adjacent reader outputs high/low level to the reader through the GPIO line to indicate that the adjacent reader sends idle/busy information to the reader.
  • GPIO general-purpose input/output
  • Step 101 The reader queries a second collision antenna adjacent to a first collision antenna of the reader in an adjacent reader. Is it busy?
  • Step 102 When the second collision antenna is idle, the reader sends busy information to an adjacent reader.
  • Step 103 The reader sends the radio frequency information into the first collision antenna to perform a tag identification operation.
  • Whether the second collision antenna in the above step 101 is busy can be judged by the level of the output level of the adjacent reader, for example, when the adjacent reader outputs a high level, it indicates that the second collision antenna is idle; The reader output low, indicating that the second collision antenna is busy.
  • the busy information sent by the reader to the adjacent readers can be represented by the ⁇ level output to the adjacent reader.
  • the first collision antenna in the reader is notified to be ready to work, and then sent to the first collision antenna.
  • the radio frequency information enters the tag identification operation, which avoids the adjacent collision antennas in the adjacent readers from entering the working state at the same time, which causes the radio frequency identification to be interfered, and improves the success rate of the radio frequency identification.
  • FIG. 3 is a schematic flowchart of another embodiment of a radio frequency identification method according to the present invention, which specifically includes:
  • Step 201 The reader queries whether the second collision antenna adjacent to the first collision antenna of the reader in the adjacent reader is busy;
  • Step 202 When the second collision antenna is busy, after the second collision antenna is busy, the reader sends busy information to the adjacent reader.
  • Step 203 The reader sends radio frequency information to the first collision antenna to perform a tag identification operation. Steps 201 and 203 in this embodiment are the same as steps 101 and 103 in the above embodiment, and are not described herein again.
  • the busy completion of the second collision antenna in the foregoing step 202 is determined by receiving idle information sent by an adjacent reader, that is, after the second collision antenna is busy, the adjacent reader sends the idle to the reader. information.
  • FIG. 4 a schematic flowchart of another embodiment of the radio frequency identification method of the present invention is proposed, which specifically includes:
  • Step 301 The reader queries whether the second collision antenna adjacent to the first collision antenna of the reader in the adjacent reader is busy;
  • Step 302 When the second collision antenna is busy, after the second collision antenna is busy timeout, the reader sends busy information to the adjacent reader.
  • Step 303 The reader sends radio frequency information to the first collision antenna for label identification operation.
  • the step 301 and the step 303 in the embodiment are the same as the steps 101 and 103 in the above embodiment, and are not described herein again.
  • the adjacent reader in this embodiment needs to send busy information to the reader before transmitting the radio frequency information to the second collision antenna for label identification operation.
  • the busy timeout timer is turned on. The timer is immediately timed. Before the timeout point (including the timeout point), the reader does not receive the idle information sent by the adjacent reader, and when the timeout point is reached, the second collision antenna is busy. The reader sends busy information to an adjacent reader and transmits radio frequency information to the first collision antenna for label recognition operation.
  • the length of the busy timeout period can be set according to actual needs.
  • the busy timeout timer is turned on to prevent the reader from transmitting the radio frequency to the first collision antenna due to the failure to send idle information to the reader after the second collision antenna is busy. Information is generated by the phenomenon of tag recognition operation. Generally, the arrival of the busy timeout point is considered to be the busy end of the second collision antenna.
  • the method further includes the following processing: sending the idle information to the adjacent reader.
  • the idle information sent to the adjacent readers may be similarly used to output a high level to an adjacent reader, and the adjacent reader receives the idle information, and confirms the idle information according to the idle information.
  • the first collision antenna is in an idle state of inactivity, and performs a tag identification operation by transmitting a busy message to the reader and then transmitting radio frequency information to the second collision antenna.
  • sending a busy message to the reader can also use the way to output a low level to the reader.
  • the step of transmitting the busy information to the adjacent reader when the second collision antenna is idle is performed. Specifically, the following processing is included: when the second collision antenna is idle, the reader queries again whether the second collision antenna is busy after the set time; if the second collision antenna is still idle, the reader sends busy information to the adjacent reader. .
  • the reader when the reader is a slave reader and the adjacent reader is the master reader, the first collision antenna of the reader is in the adjacent reader of the query. Before the neighboring second collision antenna is busy, the following processing is further included: sending busy information to the adjacent reader.
  • the reader when the reader is the main reader and the adjacent reader is the slave reader, the reader confirms that the second collision antenna is idle after two queries, and then sends the busy information to the adjacent reader.
  • the busy information is first sent to the adjacent reader.
  • the first collision antenna of the reader and the second collision antenna of the adjacent reader can be prevented from working at the same time, resulting in the interference of the label recognition operation. Health.
  • the main reader sequentially connect four antennas No. 1, No. 2, No. 3, and No. 4, and connect four antennas of a, b, c, and d sequentially from the reader, of which antenna No. 4 and a
  • the antennas are collision antennas with each other.
  • the master reader sends an idle message to the slave reader after the previous busy end of the antenna 4; likewise, the reader sends an idle message to the master reader after the previous busy end of the a number.
  • the main reader recognizes the tag corresponding to the No. 3 antenna and enters the tag identification corresponding to the No. 4 antenna.
  • the tag identification of the d-type antenna ends at the same time from the reader, and enters the corresponding antenna of the a-number antenna. Tag identification.
  • the main reader queries that the a antenna is idle, and the slave first sends busy information to the main reading.
  • the main reader queries the antenna status a again after the set time. At this time, the main reader determines that the a antenna is busy according to the busy information sent from the reader, and then sends the idle information to the slave.
  • the reader After the reader sends the busy information to the main reader, it can check and confirm that the antenna No. 4 is idle, and then send the radio frequency information from the reader to the a antenna for the label recognition operation, and send the idle information to the main reader after the operation.
  • the main reader After receiving the idle information sent from the reading, the main reader transmits the radio frequency identification information to the antenna No. 4 for tag identification operation.
  • FIG. 5 it is a schematic structural diagram of a reader according to the present invention, which includes: a query module 101, a sending module 102, and an identification module 103.
  • the query module 101 is configured to query whether the second collision antenna adjacent to the first collision antenna in the reader is busy in the adjacent reader, and the sending module 102 is configured to: when the second collision antenna is idle, The neighboring reader sends the busy information; the identification module 103 is configured to send the radio frequency to the first collision antenna after sending the busy information to the adjacent reader The information enters the label recognition operation.
  • the reader is connected to the adjacent reader through the GPIO line; the reader outputs high/low level to the adjacent reader through the GPIO line to indicate that the reader sends to the adjacent reader. Free/busy information.
  • the adjacent reader outputs high/low level to the reader through the GPIO line to indicate that the adjacent reader sends idle/busy information to the reader. Therefore, whether the second collision antenna is busy can be judged by the level of the output level of the adjacent reader, for example, when the adjacent reader outputs a high level, it indicates that the second collision antenna is idle; when adjacent reading If the device outputs a low level, it indicates that the second collision antenna is busy.
  • busy information sent to adjacent readers can be represented by a low level output to an adjacent reader.
  • the sending module 102 informs the neighboring reader that the first collision antenna is ready to work by sending busy information to the adjacent reader. Then, the identification module 103 sends the radio frequency information to the first collision antenna to perform the tag identification operation, thereby avoiding the adjacent collision antennas in the adjacent readers from entering the working state, thereby causing the radio frequency identification to be interfered, and improving the success rate of the radio frequency identification.
  • the sending module 102 is further configured to: when the second collision antenna is busy, send the busy information to the adjacent reader after the second collision antenna is busy.
  • the busy end of the second collision antenna is determined by receiving idle information sent by an adjacent reader, that is, after the second collision antenna is busy, the adjacent reader is directed to the present.
  • the reader sends idle information.
  • the sending module 102 is further configured to: when the second collision antenna is busy, send the busy information to the adjacent reader after the second collision antenna is busy timeout.
  • adjacent readers need to send busy information to the reader before transmitting radio frequency information to the second collision antenna for label identification operation.
  • the busy timeout timer is turned on. The timer is immediately timed, and before the timeout point is reached (including the timeout point), the reader does not receive the idle information sent by the adjacent reader, then When the timeout point is reached, it indicates that the second collision antenna is busy timeout, the busy information is sent to the adjacent reader through the sending module 102, and the radio frequency information is sent to the first collision antenna through the identification module 103 for label identification operation.
  • the length of the busy timeout period can be set according to actual needs.
  • the busy timeout timer is turned on to prevent the second collision antenna from being busy, and the idle information cannot be sent to the reader due to the failure, so that the identification module 103 of the reader cannot send the radio frequency information to the first collision antenna for label identification.
  • the sending module 102 is further configured to send the idle information to the adjacent reader after transmitting the radio frequency information to the first collision antenna through the identification module 103 for performing the tag identification operation.
  • the idle information sent to the adjacent readers may be similarly used to output a high level to an adjacent reader, and the adjacent reader receives the idle information, and confirms the idle information according to the idle information.
  • the first collision antenna is in an idle state of inactivity, and performs a tag identification operation by transmitting a busy message to the reader and then transmitting radio frequency information to the second collision antenna.
  • sending a busy message to the reader can also use the way to output a low level to the reader.
  • the sending module 102 is specifically used to pass the set time after the second collision antenna is idle.
  • the query module 101 queries again whether the second collision antenna is busy, and if the second collision antenna is still idle, sends busy information to the adjacent reader.
  • the sending module 102 is also used to query the adjacent reader in the reading module 101 to read the book. Before the first collision antenna adjacent to the first collision antenna is busy, adjacent to The reader sends a busy message.
  • the adjacent reader is the slave reader
  • the reader confirms that the second collision antenna is idle after querying the module twice, and then passes the sending module to the adjacent reader.
  • the busy information is first sent to the adjacent reader through the sending module, so that the first collision antenna of the reader and the adjacent one can be avoided.
  • the reader's second collision antenna operates simultaneously, causing the tag recognition operation to be disturbed.
  • the main reader sequentially connect four antennas No. 1, No. 2, No. 3, and No. 4, and connect four antennas of a, b, c, and d sequentially from the reader, of which antenna No. 4 and a
  • the antennas are collision antennas with each other.
  • the main reader sends idle information to the slave through the transmitting module after the busy end of the antenna No. 4; likewise, the idle message is sent to the master reader through the sending module after the reader has finished busy a before.
  • the main reader recognizes the tag corresponding to the antenna No. 3 and enters the tag identification corresponding to the antenna No. 4; the tag identification corresponding to the d antenna is ended at the same time, and the tag corresponding to the a antenna is entered. Identification.
  • the query module of the main reader queries that the a antenna is in an idle state, and the slave first transmits the busy information to the main reading through the transmitting module.
  • the main reader queries the antenna status of the a number again through the inquiry module. At this time, the main reader determines that the antenna a is busy according to the busy information sent from the reader, and then sends the idle information to the slave through the sending module.
  • the inquiry module queries to confirm that the antenna No. 4 is idle, and then sends the radio frequency information from the reader to the a antenna through the identification module to perform the label recognition operation, and the operation is completed after the operation is completed.
  • the sending module sends idle information to the main reader.
  • the main reader After receiving the idle information sent from the reading, the main reader transmits the radio frequency identification information to the antenna No. 4 through the identification module to perform the label recognition operation. It can be seen from the above that when the main reader and the reader collide with each other while the antenna is in the standby state, the corresponding collision antenna from the reader has the right to work preferentially, and the mutual collision of the antenna is prevented from entering the working state at the same time. Identify the occurrence of interference.

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Description

射频识别方法和阅读器 技术领域
本发明涉及射频识别技术领域， 尤其是涉及一种射频识别方法和阅读 器。 背景技术
射频识别 （RFID , Radio Frequency Identify ) 系统包括标签和读写器。 RFID技术是一种非接触式的自动识别技术， 它通过射频信号对目标对象进 行射频识别， 并向目标对象获取相关数据。 这种识别操作无须人工干预， 可应用于各种恶劣环境。 同时 RFID技术可以对高速运动的物体进行识别， 且可同时对多个标签进行识别， 操作起来方便快捷。
现有的 RFID系统包括： 无源 RFID系统和有源 RFID系统， 两者的本 质区别在于： 前者的标签从阅读器的发射波形中获取能量， 后者的标签自 身具有能源供应。 下面以无源 RFID系统为例介绍 RFID系统的工作原理。
以下为无源 RFID系统中阅读器对标签进行识别的工作原理。参照图 1 , 阅读器首先将数据信息编码、 幅移键控 （ASK )调制形成射频载波信号， 然后通过无线信道将该射频载波信号发送到一个或多个标签。 阅读器向标 签发送连续射频载波信号， 可以向标签提供能量， 另外还可以背射标签返 回的信息。 这种阅读器和标签之间的通信为半双工模式。
现有的这种射频技术广泛应用于各种领域， 如应用到电子车牌识别领 域中， 在实际的电子车牌识别技术中， 一般使用两个阅读器对电子车牌进 行识别， 两个阅读器分别接 4根天线， 对 8条车道的车载标签进行识别， 并将有关数据信息写入到车载标签中。 每个阅读器的实际运行方式为对 4 根天线轮询， 对每根天线对应车道的车载标签进行清点、 读和写操作。 两 个阅读器中的所有天线的载频相同， 如果两个阅读器同时发送射频信息的 天线为相邻天线， 则在车载标签返回信息时会受到干扰。 从而导致某些车 载标签漏点或不能成功读写， 识别率低。 发明内容
有鉴于此， 本发明的主要目的在于提供一种射频识别方法和阅读器， 提高射频识别的成功率。
为解决上述技术问题， 本发明的技术方案是这样实现的：
一种射频识别方法， 包括步骤： 查询相邻的阅读器中与本阅读器的第 一碰撞天线相邻的第二碰撞天线是否忙碌； 当第二碰撞天线空闲时， 向相 邻的阅读器发送忙碌信息； 向第一碰撞天线发送射频信息进标签识别操作。
所述向第一碰撞天线发送射频信息进行标签识别操作的步骤之后， 还 包括： 向相邻的阅读器发送空闲信息。
所述查询相邻的阅读器中与本阅读器的第一碰撞天线相邻的第二碰撞 天线是否忙碌的步骤之后， 还包括： 当第二碰撞天线忙碌时， 待第二碰撞 天线忙碌结束后， 向相邻的阅读器发送忙碌信息。
所述查询相邻的阅读器中与本阅读器的第一碰撞天线相邻的第二碰撞 天线是否忙碌的步骤之后， 还包括： 当第二碰撞天线忙碌时， 待第二碰撞 天线忙碌超时后， 向相邻的阅读器发送忙碌信息。
当本阅读器为主阅读器， 相邻的阅读器为从阅读器时， 所述当第二碰 撞天线空闲时， 向相邻的阅读器发送忙碌信息的步骤， 具体包括： 当第二 碰撞天线空闲时， 在设定时间后再次查询第二碰撞天线是否忙碌； 若第二 碰撞天线仍空闲， 向相邻的阅读器发送忙碌信息。
当本阅读器为从阅读器， 相邻的阅读器为主阅读器时， 所述查询相邻 的阅读器中与本阅读器的第一碰撞天线相邻的第二碰撞天线是否忙碌之 前， 还包括： 向相邻的阅读器发送忙碌信息。 所述本阅读器与所述相邻的阅读器通过通用输入输出线连通； 所述本 阅读器通过通用输入输出线向所述相邻的阅读器输出高 /低电平， 以表示本 阅读器向相邻的阅读器发送空闲 /忙碌信息。
一种阅读器， 包括：
查询模块， 用于查询相邻的阅读器中与本阅读器中第一碰撞天线相邻 的第二碰撞天线是否忙碌；
发送模块， 用于当第二碰撞天线空闲时， 向相邻的阅读器发送忙碌信 息；
识别模块， 用于在向相邻的阅读器发送忙碌信息后向第一碰撞天线发 送射频信息进标签识别操作。
所述发送模块， 还用于：
当第二碰撞天线忙碌时， 待第二碰撞天线忙碌结束后， 向相邻的阅读 器发送忙碌信息； 或者， 当第二碰撞天线忙碌时， 待第二碰撞天线忙碌超 时后， 向相邻的阅读器发送忙碌信息；
以及， 在通过识别模块向第一碰撞天线发送射频信息进行标签识别操 作之后， 向相邻的阅读器发送空闲信息。
当所述本阅读器为主阅读器， 所述相邻的阅读器为从阅读器时， 所述 发送模块， 还用于： 当第二碰撞天线空闲时， 在设定时间后通过查询模块 再次查询第二碰撞天线是否忙碌， 若第二碰撞天线仍空闲， 向相邻的阅读 器发送忙碌信息。
当所述本阅读器为从阅读器， 所述相邻的阅读器为主阅读器时， 所述 发送模块， 还用于： 在通过查询模块查询相邻的阅读器中与阅读器的第一 碰撞天线相邻的第二碰撞天线是否忙碌之前， 向相邻的阅读器发送忙碌信 息。
所述本阅读器与所述相邻的阅读器通过通用输入输出线连通； 所述本 阅读器通过通用输入输出线向所述相邻的阅读器输出高 /低电平， 以表示本 阅读器向相邻的阅读器发送空闲 /忙碌信息。
本发明提供的射频识别方法和阅读器， 在相邻的阅读器中第二碰撞天 线空闲时， 通过向相邻的阅读器发送忙碌信息， 告知其本阅读器中第一碰 撞天线准备工作， 然后再向第一碰撞天线发送射频信息进标签识别操作， 避免了相邻阅读器中相邻的碰撞天线进入工作状态， 而导致射频识别遭受 干扰， 提高了射频识别的成功率。 附图说明
图 1是现有技术中阅读器对标签进行识别的工作原理示意图； 图 2是本发明的射频识别方法的一实施例的流程示意图；
图 3是本发明的视频识别方法的另一实施例的流程示意图；
图 4是本发明的射频识别方法的另一实施例的流程示意图；
图 5是本发明的阅读器的一实施例的结构示意图。 具体实施方式
本发明目的的实现、 功能特点及优点将结合实施例， 参照附图做进一 步说明。 应当理解， 此处所描述的具体实施例仅仅用以解释本发明， 并不 用于限定本发明。
本发明所涉及的本阅读器和相邻的阅读器中分别设置有多根用于发送 射频信息进行标签识别操作的天线， 其中本阅读器中与相邻的阅读器相邻 的天线， 以及相邻的阅读器中与本阅读器相邻的天线， 二者互为相邻天线， 即碰撞天线。 为区别开来， 本阅读器中与相邻的阅读器相邻的天线为第一 碰撞天线， 相邻的阅读器中与本阅读器相邻的天线为第二碰撞天线。
本发明中所有实施例中， 本阅读器与相邻的阅读器通过通用输入输出 ( GPIO )线连通； 本阅读器通过 GPIO线向相邻的阅读器输出高 /低电平， 以表示本阅读器向相邻的阅读器发送空闲 /忙碌信息。 同理， 相邻的阅读器 通过 GPIO线向本阅读器输出高 /低电平， 以表示相邻的读器向本阅读器发 送空闲 /忙碌信息。
参见图 2,为本发明的射频识别方法一实施例的流程示意图，具体包括： 步骤 101、本阅读器查询相邻的阅读器中与本阅读器的第一碰撞天线相 邻的第二碰撞天线是否忙碌；
步骤 102、 当第二碰撞天线空闲时， 本阅读器向相邻的阅读器发送忙碌 信息；
步骤 103、 本阅读器向第一碰撞天线发送射频信息进标签识别操作。 上述步骤 101 中的第二碰撞天线是否忙碌可以通过相邻的阅读器输出 电平的高低来判断， 例如， 当相邻的阅读器输出高电平， 则表明第二碰撞 天线空闲； 当相邻的阅读器输出低电平， 则表明第二碰撞天线忙碌。 同理， 本阅读器向相邻的阅读器发送的忙碌信息可以通过向相邻的阅读器输出的 氐电平进行表示。
本实施例， 在相邻的阅读器中第二碰撞天线空闲时， 通过向相邻的阅 读器发送忙碌信息， 告知其本阅读器中第一碰撞天线准备工作， 然后再向 第一碰撞天线发送射频信息进标签识别操作， 避免了相邻阅读器中相邻的 碰撞天线同时进入工作状态， 而导致射频识别遭受干扰， 提高了射频识别 的成功率。
参见图 3 , 为本发明的射频识别方法的另一实施例的流程示意图， 具体 包括：
步骤 201、本阅读器查询相邻的阅读器中与本阅读器的第一碰撞天线相 邻的第二碰撞天线是否忙碌；
步骤 202、 当第二碰撞天线忙碌时， 待第二碰撞天线忙碌结束后， 本阅 读器向相邻的阅读器发送忙碌信息； 步骤 203、 本阅读器向第一碰撞天线发送射频信息进行标签识别操作。 本实施例中的步骤 201、步骤 203与上述实施例中的步骤 101、步骤 103 相同， 在此不再赘述。
进一步地， 上述步骤 202所述第二碰撞天线忙碌结束是通过接收相邻 的阅读器发送的空闲信息进行确定的， 即第二碰撞天线忙碌结束后， 相邻 的阅读器向本阅读器发送空闲信息。
参见图 4,提出本发明的射频识别方法的另一实施例的流程示意图， 具 体包括：
步骤 301、本阅读器查询相邻的阅读器中与本阅读器的第一碰撞天线相 邻的第二碰撞天线是否忙碌；
步骤 302、 当第二碰撞天线忙碌时， 待第二碰撞天线忙碌超时后， 本阅 读器向相邻的阅读器发送忙碌信息；
步骤 303、 本阅读器向第一碰撞天线发送射频信息进行标签识别操作。 本实施例中的步骤 301、步骤 303与上述实施例中的步骤 101、步骤 103 相同， 在此不再赘述。
另外， 本实施例中的相邻的阅读器在向第二碰撞天线发送射频信息进 行标签识别操作之前， 需向本阅读器发送忙碌信息。 本阅读器接收到该忙 碌信息后， 开启忙碌超时定时器。 该定时器便即刻计时， 到达超时时间点 之前（包括该超时时间点）， 本阅读器没有接收到相邻的阅读器发送的空闲 信息， 则当到达超时时间点时表明第二碰撞天线忙碌超时， 本阅读器向相 邻的阅读器发送忙碌信息， 并向第一碰撞天线发送射频信息进行标签识别 操作。
其中， 上述忙碌超时时间的长短可以根据实际需要进行设定。 开启忙 碌超时定时器， 是为了防止第二碰撞天线忙碌结束后， 由于出现故障无法 向本阅读器发送空闲信息， 而导致本阅读器无法向第一碰撞天线发送射频 信息进行标签识别操作现象的发生。 一般地， 到达忙碌超时时间点被认为 第二碰撞天线忙碌结束。
进一步地， 以上所述实施例中的向第一碰撞天线发送射频信息进行标 签识别操作的步骤之后还包括如下处理： 向相邻的阅读器发送空闲信息。
上述向相邻的阅读器发送的空闲信息， 同理可以釆用向相邻的阅读器 输出高电平的方式， 相邻的阅读器接收到该空闲信息， 根据该空闲信息确 认本阅读器中的第一碰撞天线处于不工作的空闲状态， 并通过向本阅读器 发送忙碌信息， 然后向第二碰撞天线发送射频信息进行标签识别操作。 同 理， 向本阅读器发送忙碌信息也可以釆用向本阅读器输出低电平的方式。
进一步地， 在以上实施例中， 当本阅读器为主阅读器， 相邻的阅读器 为从阅读器时， 所述当第二碰撞天线空闲时， 向相邻的阅读器发送忙碌信 息的步骤具体包括如下处理： 当第二碰撞天线空闲时， 在设定时间后本阅 读器再次查询第二碰撞天线是否忙碌； 若第二碰撞天线仍空闲， 本阅读器 向相邻的阅读器发送忙碌信息。
另外， 若在设定时间后再次查询第二碰撞天线是否忙碌， 第二碰撞天 线处于忙碌状态， 则本阅读器需等待。
进一步地， 在以上实施例中， 当本阅读器为从阅读器， 相邻的阅读器 为主阅读器时， 则在所述查询相邻的阅读器中与本阅读器的第一碰撞天线 相邻的第二碰撞天线是否忙碌之前还包括如下处理： 向相邻的阅读器发送 忙碌信息。
本发明中， 当本阅读器为主阅读器， 相邻的阅读器为从阅读器， 本阅 读器通过两次查询确认第二碰撞天线空闲后， 才向相邻的阅读器发送忙碌 信息。 而当本阅读器为从阅读器， 相邻的阅读器为主阅读器时， 首先就向 相邻的阅读器发送忙碌信息。 可以避免本阅读器的第一碰撞天线和相邻的 阅读器的第二碰撞天线同时进行工作， 导致标签识别操作受干扰现象的发 生。
例如， 设主阅读器顺序连接 1号、 2号、 3号和 4号四根天线， 从阅读 器顺序连接 a号、 b号、 c号和 d号四根天线， 其中 4号天线和 a号天线互 为碰撞天线。 主阅读器在 4号天线前一次忙碌结束后向从阅读器发送空闲 信息； 同样从阅读器在 a号前一次忙碌结束后向主阅读器发送空闲信息。 在某一时刻， 主阅读器对 3号天线对应的标签识别结束， 进入 4号天线对 应的标签识别； 从阅读器在该同一时刻对 d号天线对应的标签识别结束， 进入 a号天线对应的标签识别。在该时刻，主阅读器查询到 a天线为空闲状 态， 而从阅读器首先向主阅读发送忙碌信息。
主阅读器在设定时间后再次查询 a号天线状态， 此时主阅读器根据从 阅读器发送的忙碌信息确定 a号天线忙碌， 然后再向从阅读器发送空闲信 息。
从阅读器在向主阅读器发送忙碌信息后， 再查询确认 4号天线为空闲， 然后从阅读器向 a天线发送射频信息进行标签识别操作， 操作完毕后向主 阅读器发送空闲信息。
主阅读器接收到从阅读发送的空闲信息后， 向 4号天线发送射频识别 信息进行标签识别操作。
由上可知， 当主阅读器和从阅读器中互为碰撞天线同时进行待工作状 态时， 从阅读器的对应的碰撞天线具有优先工作的权利， 避免了互为碰撞 的天线同时进入工作状态导致射频识别遭受干扰现象的发生。
参见图 5 , 为本发明的阅读器的结构示意图， 其包括： 查询模块 101、 发送模块 102和识别模块 103。 其中， 查询模块 101 , 用于查询相邻的阅读 器中与本阅读器中第一碰撞天线相邻的第二碰撞天线是否忙碌； 发送模块 102, 用于当第二碰撞天线空闲时， 向相邻的阅读器发送忙碌信息； 识别模 块 103 , 用于在向相邻的阅读器发送忙碌信息后， 向第一碰撞天线发送射频 信息进标签识别操作。
本实施例中，本阅读器与相邻的阅读器通过 GPIO线连通； 本阅读器通 过 GPIO线向相邻的阅读器输出高 /低电平， 以表示本阅读器向相邻的阅读 器发送空闲 /忙碌信息。 同理， 相邻的阅读器通过 GPIO线向本阅读器输出 高 /低电平， 以表示相邻的阅读器向本阅读器发送空闲 /忙碌信息。 因此， 上 述第二碰撞天线是否忙碌可以通过相邻的阅读器输出电平的高低来判断， 例如， 当相邻的阅读器输出高电平， 则表明第二碰撞天线空闲； 当相邻的 阅读器输出低电平， 则表明第二碰撞天线忙碌。 同理， 向相邻的阅读器发 送的忙碌信息可以通过向相邻的阅读器输出的低电平进行表示。
本实施例， 在查询模块 101 查询到相邻的阅读器中第二碰撞天线空闲 时， 发送模块 102通过向相邻的阅读器发送忙碌信息， 告知其本阅读器中 第一碰撞天线准备工作， 然后再通过识别模块 103 向第一碰撞天线发送射 频信息进标签识别操作， 避免了相邻阅读器中相邻的碰撞天线进入工作状 态， 而导致射频识别遭受干扰， 提高了射频识别的成功率。
进一步地， 上述的阅读器中， 发送模块 102, 还用于当第二碰撞天线忙 碌时， 待第二碰撞天线忙碌结束后， 向相邻的阅读器发送忙碌信息。
进一步地， 上述的阅读器中， 所述第二碰撞天线忙碌结束是通过接收 相邻的阅读器发送的空闲信息进行确定的， 即第二碰撞天线忙碌结束后， 相邻的阅读器则向本阅读器发送空闲信息。
进一步地， 上述的阅读器中， 发送模块 102, 还用于当第二碰撞天线忙 碌时， 待第二碰撞天线忙碌超时后， 向相邻的阅读器发送忙碌信息。
本实施例中相邻的阅读器在向第二碰撞天线发送射频信息进行标签识 别操作之前， 需向本阅读器发送忙碌信息。 本阅读器接收到该忙碌信息后， 开启忙碌超时定时器。 该定时器便即刻计时， 到达超时时间点之前（包括 该超时时间点）， 本阅读器没有接收到相邻的阅读器发送的空闲信息， 则当 到达超时时间点时表明第二碰撞天线忙碌超时， 通过发送模块 102 向相邻 的阅读器发送忙碌信息， 并通过识别模块 103 向第一碰撞天线发送射频信 息进行标签识别操作。
其中， 上述忙碌超时时间的长短可以根据实际需要进行设定。 开启忙 碌超时定时器， 是为了防止第二碰撞天线忙碌结束后， 由于出现故障无法 向本阅读器发送空闲信息， 而导致本阅读器的识别模块 103 无法向第一碰 撞天线发送射频信息进行标签识别操作现象的发生。 一般地， 到达忙碌超 时时间点被认为第二碰撞天线忙碌结束。
进一步地， 上述的阅读器中， 发送模块 102 , 还用于在通过识别模块 103向第一碰撞天线发送射频信息进行标签识别操作之后，向相邻的阅读器 发送空闲信息。
上述向相邻的阅读器发送的空闲信息， 同理可以釆用向相邻的阅读器 输出高电平的方式， 相邻的阅读器接收到该空闲信息， 根据该空闲信息确 认本阅读器中的第一碰撞天线处于不工作的空闲状态， 并通过向本阅读器 发送忙碌信息， 然后向第二碰撞天线发送射频信息进行标签识别操作。 同 理， 向本阅读器发送忙碌信息也可以釆用向本阅读器输出低电平的方式。
进一步地， 上述的阅读器， 当本阅读器为主阅读器， 相邻的阅读器为 从阅读器时， 发送模块 102 , 具体还用于当第二碰撞天线空闲时， 在设定时 间后通过查询模块 101 再次查询第二碰撞天线是否忙碌， 若第二碰撞天线 仍空闲， 向相邻的阅读器发送忙碌信息。
另外， 若在设定时间后再次查询第二碰撞天线是否忙碌， 第二碰撞天 线处于忙碌状态， 则本阅读器需等待。
进一步地， 上述的阅读器， 当本阅读器为从阅读器， 相邻的阅读器为 主阅读器时，发送模块 102,还用于在通过查询模块 101查询相邻的阅读器 中与本阅读器的第一碰撞天线相邻的第二碰撞天线是否忙碌之前， 向相邻 的阅读器发送忙碌信息。
本发明中， 当本阅读器为主阅读器， 相邻的阅读器为从阅读器， 本阅 读器通过查询模块两次查询确认第二碰撞天线空闲后， 才通过发送模块向 相邻的阅读器发送忙碌信息。 而当本阅读器为从阅读器， 相邻的阅读器为 主阅读器时， 首先就通过发送模块向相邻的阅读器发送忙碌信息， 可以避 免本阅读器的第一碰撞天线和相邻的阅读器的第二碰撞天线同时进行工 作， 导致标签识别操作受干扰现象的发生。
例如， 设主阅读器顺序连接 1号、 2号、 3号和 4号四根天线， 从阅读 器顺序连接 a号、 b号、 c号和 d号四根天线， 其中 4号天线和 a号天线互 为碰撞天线。 主阅读器在 4号天线前一次忙碌结束后， 通过发送模块向从 阅读器发送空闲信息； 同样从阅读器在 a号前一次忙碌结束后， 通过发送 模块向主阅读器发送空闲信息。 在某一时刻主阅读器对 3 号天线对应的标 签识别结束， 进入 4号天线对应的标签识别； 从阅读器在该同一时刻对 d 号天线对应的标签识别结束， 进入 a号天线对应的标签识别。 在该时刻， 主阅读器的查询模块查询到 a天线为空闲状态， 而从阅读器首先通过发送 模块向主阅读发送忙碌信息。
主阅读器在设定时间后再次通过查询模块查询 a号天线状态， 此时主 阅读器根据从阅读器发送的忙碌信息确定 a号天线忙碌， 然后再通过发送 模块向从阅读器发送空闲信息。
从阅读器在通过发送模块向主阅读器发送忙碌信息后， 再通过查询模 块查询确认 4号天线为空闲， 然后从阅读器通过识别模块向 a天线发送射 频信息进行标签识别操作， 操作完毕后通过发送模块向主阅读器发送空闲 信息。
主阅读器接收到从阅读发送的空闲信息后， 通过识别模块向 4号天线 发送射频识别信息进行标签识别操作。 由上可知， 当主阅读器和从阅读器中互为碰撞天线同时进行待工作状 态时， 从阅读器的对应的碰撞天线具有优先工作的权利， 避免了互为碰撞 的天线同时进入工作状态导致射频识别遭受干扰现象的发生。
应当理解的是， 以上仅为本发明的优选实施例， 不能因此限制本发明 的专利范围， 凡是利用本发明说明书及附图内容所作的等效结构或等效流 程变换， 或直接或间接运用在其他相关的技术领域， 均同理包括在本发明 的专利保护范围内。

Claims

权利要求书
1、 一种射频识别方法， 其特征在于， 包括步骤：
查询相邻的阅读器中与本阅读器的第一碰撞天线相邻的第二碰撞天线 是否忙碌；
当第二碰撞天线空闲时， 向相邻的阅读器发送忙碌信息；
向第一碰撞天线发送射频信息进标签识别操作。
2、 根据权利要求 1所述的射频识别方法， 其特征在于， 所述向第一碰 撞天线发送射频信息进行标签识别操作的步骤之后， 还包括：
向相邻的阅读器发送空闲信息。
3、 根据权利要求 1所述的射频识别的方法， 其特征在于， 所述查询相 邻的阅读器中与本阅读器的第一碰撞天线相邻的第二碰撞天线是否忙碌的 步骤之后， 还包括：
当第二碰撞天线忙碌时， 待第二碰撞天线忙碌结束后， 向相邻的阅读 器发送忙碌信息。
4、 根据权利要求 1所述的射频识别的方法， 其特征在于， 所述查询相 邻的阅读器中与本阅读器的第一碰撞天线相邻的第二碰撞天线是否忙碌的 步骤之后， 还包括：
当第二碰撞天线忙碌时 , 待第二碰撞天线忙碌超时后 , 向相邻的阅读 器发送忙碌信息。
5、 根据权利要求 1所述的射频识别方法， 其特征在于， 当本阅读器为 主阅读器， 相邻的阅读器为从阅读器时， 所述当第二碰撞天线空闲时， 向 相邻的阅读器发送忙碌信息的步骤， 具体包括：
当第二碰撞天线空闲时， 在设定时间后再次查询第二碰撞天线是否忙 碌；
若第二碰撞天线仍空闲， 向相邻的阅读器发送忙碌信息。
6、 根据权利要求 1所述的射频识别方法， 其特征在于， 当本阅读器为 从阅读器， 相邻的阅读器为主阅读器时， 所述查询相邻的阅读器中与本阅 读器的第一碰撞天线相邻的第二碰撞天线是否忙碌之前， 还包括：
向相邻的阅读器发送忙碌信息。
7、 根据权利要求 1至 6任一项所述的射频识别方法， 其特征在于， 所述本阅读器与所述相邻的阅读器通过通用输入输出线连通； 所述本阅读器通过通用输入输出线向所述相邻的阅读器输出高 /低电 平， 以表示本阅读器向相邻的阅读器发送空闲 /忙碌信息。
8、 一种阅读器， 其特征在于， 包括：
查询模块， 用于查询相邻的阅读器中与本阅读器中第一碰撞天线相邻 的第二碰撞天线是否忙碌；
发送模块， 用于当第二碰撞天线空闲时， 向相邻的阅读器发送忙碌信 息；
识别模块， 用于在向相邻的阅读器发送忙碌信息后向第一碰撞天线发 送射频信息进标签识别操作。
9、 根据权利要求 8所述的阅读器， 其特征在于， 所述发送模块， 还用 于：
当第二碰撞天线忙碌时， 待第二碰撞天线忙碌结束后， 向相邻的阅读 器发送忙碌信息； 或者， 当第二碰撞天线忙碌时， 待第二碰撞天线忙碌超 时后， 向相邻的阅读器发送忙碌信息；
以及， 在通过识别模块向第一碰撞天线发送射频信息进行标签识别操 作之后， 向相邻的阅读器发送空闲信息。
10、 根据权利要求 8所述的阅读器， 其特征在于， 当所述本阅读器为 主阅读器， 所述相邻的阅读器为从阅读器时，
所述发送模块， 还用于： 当第二碰撞天线空闲时， 在设定时间后通过 查询模块再次查询第二碰撞天线是否忙碌， 若第二碰撞天线仍空闲， 向相 邻的阅读器发送忙碌信息。
11、 根据权利要求 8 所述的阅读器， 其特征在于， 当所述本阅读器为 从阅读器， 所述相邻的阅读器为主阅读器时，
所述发送模块， 还用于： 在通过查询模块查询相邻的阅读器中与阅读 器的第一碰撞天线相邻的第二碰撞天线是否忙碌之前， 向相邻的阅读器发 送忙碌信息。
12、 根据权利要求 8至 11任一项所述的阅读器， 其特征在于， 所述本阅读器与所述相邻的阅读器通过通用输入输出线连通； 所述本阅读器通过通用输入输出线向所述相邻的阅读器输出高 /低电 平， 以表示本阅读器向相邻的阅读器发送空闲 /忙碌信息。
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