WO2011020278A1 - 射频识别系统中标签的清点方法及清点系统 - Google Patents

射频识别系统中标签的清点方法及清点系统 Download PDF

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Publication number
WO2011020278A1
WO2011020278A1 PCT/CN2009/076147 CN2009076147W WO2011020278A1 WO 2011020278 A1 WO2011020278 A1 WO 2011020278A1 CN 2009076147 W CN2009076147 W CN 2009076147W WO 2011020278 A1 WO2011020278 A1 WO 2011020278A1
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Prior art keywords
tag
reader
response information
information
inventory
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PCT/CN2009/076147
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English (en)
French (fr)
Inventor
杜江
王立
张建
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US13/258,859 priority Critical patent/US20120188060A1/en
Priority to EP09848419.9A priority patent/EP2431909A4/en
Publication of WO2011020278A1 publication Critical patent/WO2011020278A1/zh

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    • 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.
    • G06K7/10029—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 time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
    • G06K7/10039—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 time domain, e.g. using binary tree search or RFID responses allocated to a random time slot interrogator driven, i.e. synchronous

Definitions

  • the present invention relates to the field of wireless communications, and more particularly to a method and an inventory system for tag inventory in the field of radio frequency identification (RFID).
  • RFID radio frequency identification
  • the RFID (Radio Frequency Identification) system includes tags and readers. It is a non-contact automatic identification technology that automatically recognizes target objects and acquires relevant data through radio frequency signals. The identification work can be performed in various harsh environments without manual intervention. RFID technology recognizes high-speed moving objects and recognizes multiple labels at the same time, making operation quick and easy. Its working principle is as follows:
  • the reader transmits information to one or more tags by modulating the RF carrier signal, and the tag obtains the working power energy through the RF electromagnetic field of the reader; the tag information is encoded according to a certain encoding mode; the tag modulates the amplitude or phase of the RF carrier by backscattering To transmit information; the reader obtains the information of the tag by sending an unmodulated RF carrier and listening to the backscattered reply of the tag; the reader decodes the tag information; the communication between the reader and the tag is half-double Work.
  • Passive tags are mainly composed of an antenna system, a radio frequency unit, a logic unit, a memory, and the like. Part of the energy it gets from the reader is consumed by the internal circuitry and the other part is transmitted through the antenna.
  • the response signal of the tag is to modulate the baseband signal onto the high frequency carrier sent by the reader and send it to the reader in a wireless manner.
  • the reader At the beginning of the entire RFID system, the reader first counts all the tags in the wireless field, obtains the identification information of all the tags in the wireless field, and then reads and writes the tags according to the requirements of the system application.
  • the inventory process is the most basic and application of the RFID system.
  • Figure 1 depicts the structure of the tag response information in ISO18000-6B, at ISO18000-6B.
  • the structure of the tag response information includes a preamble, a tag ID information, and a CRC check code.
  • the preamble is mainly a frame synchronization function implemented by the reader, and the tag ID information is used to distinguish different tags so that the reader can recognize the CRC.
  • the check code is used to verify the integrity of the response message.
  • Figure 2 is a flow chart of label inventory in ISO18000-6B. It mainly describes the process of label response in ISO18000-6B. During the inventory process, the label is counted according to the following process:
  • Step S201 The reader sends an inventory command
  • Step S202 The label reflects the label response information, including the reflected preamble, the ID information, and the check code.
  • Step S203 The reader determines whether the tag ID can be correctly decoded. If the ID of the tag can be correctly decoded after the preamble, and the verification is correct, proceed to step S204; if an error occurs, the collision or transmission is considered to occur. If the error occurs, return to step S201 and continue the following inventory process.
  • Step S204 The inventory is completed, and the label exits the inventory process.
  • the ID of the tag is generally 64 bits, and the amount of relative transmission data is large, and whether it is correct inventory or collision, it is necessary to transmit 64 bits to judge, resulting in a long time slot, so the inventory speed is slow.
  • the present invention provides a method and an inventory system for tag inventory in a radio frequency identification system.
  • a method for inventorying tags in a radio frequency identification system is applied to a radio frequency identification system including a reader and a tag, the method comprising:
  • the tag After receiving the inventory command sent by the reader, the tag reflects the first response information used for decoding the check;
  • the reader After receiving the first response information, the reader sends the decoded RN if the first response information can be correctly decoded;
  • the tag After receiving the decoded RN, the tag reflects the second response information when the RN confirms that the RN is in the same state as the RN, and the second response information includes the tag ID information.
  • the reader After receiving the second response message, the reader confirms that the inventory is completed if the tag ID information contained therein is correct.
  • the first response information includes an RN and a CRC check code
  • the correct decoding process of the reader includes:
  • the reader correctly decodes the RN and verifies it correctly according to the CRC check code.
  • the method further includes: the reader is unable to correctly decode the RN and/or the CRC check code check error, and the reader resends the inventory command.
  • the method further includes: the reader does not obtain the tag ID information and/or the tag ID information is incorrect, and the reader resends the decoded RN.
  • the first response information further includes a preamble.
  • the decoded RN is carried by the ACK command.
  • the RN is libit
  • the CRC check code is 5 bits.
  • An inventory checking system for a tag in a radio frequency identification system comprising: a reader and a tag; wherein the reader is configured to send the decoded RN in a case where the first response information from the tag can be correctly decoded; and receive the After the second response information of the tag, if the tag ID information contained therein is correct, it is confirmed that the inventory is completed;
  • the tag configured to reflect first response information used for decoding verification after receiving an inventory command sent by the reader; and reflect when the decoded RN is received and the RN is confirmed to be consistent with its own RN Second response information, the second response information including tag ID information.
  • the first response information includes an RN and a CRC check code
  • the reader is further configured to: when the first response information is received, and the RN and/or CRC check code verification error cannot be correctly decoded, Send an inventory command.
  • the reader is further used to:
  • the decoded RN is retransmitted.
  • the RN is libit, and the CRC check code is 5 bits; or, the RN is 16 bits, and the CRC check code is 16 bits.
  • the amount of data transmitted during the counting process is small, and the transmission time is small at the same transmission rate; and during the transmission process, the transmission error can be found more quickly, and therefore, the label is improved during the counting process.
  • the efficiency of the response reducing the time and energy of the inventory loss.
  • Figure 1 is a structural diagram of tag response information in ISO18000-6B
  • Figure 2 is a flow chart of the tag inventory in ISO18000-6B
  • FIG. 3 is a structural diagram of a first response information in the inventory method of the present invention.
  • FIG. 3 is a structural diagram of a first response information in the inventory method of the present invention
  • the structure of the first response information of the tag includes a preamble, a random number RN, and a CRC check code
  • the preamble is mainly a frame synchronization function implemented by the reader
  • the number RN is generated by the random number generator of the tag to distinguish the difference
  • the tag enables the reader to recognize that the CRC is to verify the integrity of the response message.
  • the number of bits of the random number RN and the CRC check code can be randomly selected, but in practical applications, the sum of the two is generally an integer byte, that is, a multiple of 8. Frequently used are 16-bit random numbers and 16-bit CRC, or 11-bit random numbers and 5-digit check codes. In this embodiment, an 11-bit random number, CRC5, is used.
  • the label reflects the first response information, where the preamble, the libit random number RN11, and the CRC5 are included;
  • step S403 The reader determines whether the first response information can be correctly decoded to obtain the RN11. If the 16-bit data can be correctly decoded after the preamble, and the 16-bit data is determined according to the CRC5 check, the correct RN11 and the correct RN11 are considered. CRC5, proceeding to step S404; if 16-bit data cannot be correctly decoded or a verification error occurs, it is considered that a collision has occurred, and the process returns to step S401 to continue the following inventory process.
  • S404 The reader sends an ACK command, where the decoded random number RN11 of the tag is carried, to confirm the identification information of the tag.
  • S405 After receiving the ACK command, the tag confirms that the decoded random number RN11 carried by the ACK is consistent with its own RN11, and reflects the second response information, including the tag ID information, to the reader.
  • S406 The reader receives the tag number After the second response message, if it can be confirmed that the tag ID information is correct, the information of the tag is correct, and S407 is performed; if the ID information of the tag response is not received or the ID information is verified incorrectly, the tag response ID is indicated. An error occurred during the process of the message, returning to step 4 to resend the ACK command;
  • the present invention provides a tag for constructing first response information, the first response information including a preamble, a random number RN, and a CRC check code; the preamble is used to implement frame synchronization of a reader The random number RN is used to identify a label; the CRC check code is used to verify the integrity of the first response information.
  • the inventory method of the present invention is applied to a radio frequency identification system including a reader and a tag, the method comprising: after receiving an inventory command sent by the reader, the tag reflects the first response information used for decoding verification; After receiving the first response information, the reader sends the decoded RN when the first response information can be correctly decoded; after receiving the decoded RN, the tag confirms the RN and its own RN— In the case of the second response information, the second response information includes the tag ID information. After receiving the second response message, the reader confirms that the inventory is completed if the tag ID information contained therein is correct.
  • the inventory system of the present invention includes a reader and a tag; wherein the reader is configured to send the decoded RN in a case where the first response information from the tag can be correctly decoded; and receive the second response information from the tag After the label ID information contained therein is correct, the verification is completed; the label is configured to reflect the first response information for decoding verification after receiving the inventory command sent by the reader; The decoded RN, and confirming that the RN is in agreement with its own RN, reflects the second response information, and the second response information includes tag ID information.
  • the technology of the present invention can transmit less data amount in the counting process, and has less transmission time at the same transmission rate; and in the transmission process, the transmission error can be found more quickly, therefore, the counting point is improved.
  • the efficiency of the tag response during the process reduces the time and energy of the inventory loss.

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Description

射频识别系统中标签的清点方法及清点系统 技术领域
本发明涉及无线通信领域， 特别是射频识别 （RFID )领域标签清点的 方法及清点系统。 背景技术
无源射频识别 （RFID, Radio Frequency Identify ) 系统包括标签和读写 器。 是一种非接触式的自动识别技术， 它通过射频信号自动识别目标对象 并获取相关数据， 识别工作无须人工干预， 可工作于各种恶劣环境。 RFID 技术可识别高速运动物体并可同时识别多个标签， 操作快捷方便。 其工作 原理如下：
阅读器通过调制射频载波信号发送信息到一个或多个标签， 标签通过 阅读器的 RF电磁场来获得工作电源能量；标签信息按照一定的编码方式编 码； 标签通过反向散射调制射频载波的幅度或者相位来传送信息； 阅读器 通过发送一个未经调制的 RF载波并侦听标签的反向散射的回复来获得标 签的信息； 阅读器对标签信息译码； 阅读器和标签之间的通讯是半双工的。
无源标签主要由天线系统， 射频单元， 逻辑单元， 存储器等构成。 它 从阅读器获得的能量一部分被内部电路消耗， 另一部分通过天线发射出去。 标签的应答信号是将基带信号调制到阅读器发过来的高频载波上， 通过无 线方式发送到阅读器。整个 RFID系统起始的时候， 首先是阅读器对无线场 中所有的标签进行清点， 得到无线场中所有标签的识别信息， 然后按照系 统应用的要求对标签进行读写。 其中清点过程是 RFID系统应用最基础的， 也是应用最多的。
图 1描述的是 ISO18000-6B中标签应答信息的结构， 在 ISO18000-6B 中， 标签应答信息的结构包括前同步码、 标签 ID信息和 CRC校验码， 前 同步码主要是阅读器实现帧同步功能， 标签 ID信息是用于区别不同标签， 使得阅读器能够识别， CRC校验码是为了验证应答信息的完整性。
图 2是 ISO18000-6B中标签清点流程图， 主要描述 ISO18000-6B中标 签应答的流程， 清点过程中按照下面的流程进行标签清点：
步骤 S201 : 阅读器发送清点命令；
步骤 S202: 标签反射标签应答信息， 其中包括反射前同步码、 ID信息 和校验码；
步骤 S203: 阅读器判断是否能正确解码得到标签 ID; 如果能够在前同 步码之后能够正确解码得到标签的 ID, 而且校验正确， 那么继续进行步骤 S204; 如果出现错误， 则认为发生碰撞或传输出错， 返回步骤 S201 , 继续 下面的清点过程。
步骤 S204: 完成清点， 标签退出清点流程。
标签退出清点流程后， 阅读器整体的清点流程如果没有结束， 则继续 进行下一步的清点。
在上述清点过程中， 标签的 ID—般为 64bit, 相对传输数据量较多， 而 且不管是正确清点还是碰撞， 都要传输 64bit之后进行判断， 造成整个时隙 比较长， 所以清点速度较慢。
从现有标准看， 目前的清点过程中清点速度不高， 主要是由于标签应 答清点命令的信息较长， 浪费时间较多； 或是清点命令误码较多， 成功率 较低。 发明内容
为了解决上述技术问题， 本发明提供了一种射频识别系统中标签的清 点方法及清点系统。
为了解决上述技术问题， 本发明的技术方案是这样实现的： 一种射频识别系统中标签的清点方法， 应用于包括阅读器和标签的射 频识别系统， 该方法包括：
接收到阅读器发送的清点命令后， 标签反射用于解码校验的第一应答 信息；
接收到所述第一应答信息后， 阅读器在能够正确解码该第一应答信息 的情况下发送解码后的 RN;
接收到所述解码后的 RN后，标签在确认该 RN与自身的 RN—致的情 况下反射第二应答信息， 所述第二应答信息包括标签 ID信息；
接收到所述第二应答信息后， 阅读器在其中所包含的标签 ID信息正确 的情况下确认清点完成。
所述第一应答信息中包括 RN和 CRC校验码， 所述阅读器正确解码的 过程包括：
所述阅读器正确解码得到所述 RN,且按照所述 CRC校验码校验正确。 接收到所述第一应答信息后， 该方法进一步包括， 所述阅读器不能正 确解码 RN和 /或 CRC校验码校验错误， 所述阅读器重新发送清点命令。
在收到所述第二应答信息后， 该方法进一步包括， 所述阅读器没有获 取到所述标签 ID信息和 /或标签 ID信息有误， 所述阅读器重新发送解码后 的 RN。
所述第一应答信息进一步包括前同步码。
解码后的所述 RN由 ACK命令携带。
在所述第一应答信息中， RN为 libit, CRC校验码为 5bit。
一种射频识别系统中标签的清点系统， 包括阅读器和标签； 其中， 所述阅读器， 用于在能够正确解码来自标签的第一应答信息的情况下 发送解码后的 RN; 以及接收到来自标签的第二应答信息后， 在其中所包含 的标签 ID信息正确的情况下确认清点完成； 所述标签， 用于在接收到阅读器发送的清点命令后反射用于解码校验 的第一应答信息； 以及在接收到解码后的 RN、 并且确认该 RN 与自身的 RN一致的情况下反射第二应答信息，所述第二应答信息包括标签 ID信息。
所述第一应答信息中包括 RN和 CRC校验码，所述阅读器进一步用于： 接收到所述第一应答信息、并且不能正确解码 RN和 /或 CRC校验码校 验错误时， 重新发送清点命令。
所述阅读器进一步用于：
在收到所述第二应答信息、并且没有获取到所述标签 ID信息和 /或标签 ID信息有误时， 重新发送解码后的 RN。
在所述第一应答信息中， RN为 libit, CRC校验码为 5bit; 或者， RN 为 16bit, CRC校验码为 16bit。
应用本发明所述的技术方案， 在清点过程中传输的数据量较少， 相同 传输速率下， 传输时间少； 且在传输过程中， 能更快的发现传输错误， 因 此， 提高清点过程中标签应答的效率， 降低清点损耗的时间和能量。 附图说明
图 1是 ISO18000-6B中标签应答信息的结构图；
图 2是 ISO18000-6B中标签清点流程图；
图 3是本发明清点方法中第一应答信息结构图；
图 4是本发明提供的标签的清点方法流程图。 具体实施方式
下面结合附图对本发明的实施例详细说明。
图 3是本发明清点方法中第一应答信息结构图； 标签的第一应答信息 的结构包括前同步码、 随机数 RN和 CRC校验码， 前同步码主要是阅读器 实现帧同步功能； 随机数 RN是标签的随机数发生器产生的，用于区别不同 标签， 使得阅读器能够识别， CRC校验码是为了验证应答信息的完整性。 随机数 RN和 CRC校验码的位数可以随机选择， 但在实际应用中， 一般两 者之和为整数字节， 即 8的倍数。 经常采用的是 16位随机数和 16位 CRC 校验码， 或者 11位随机数和 5位校验码。 在本实施例中采用 11位随机数， CRC5来实现。
图 4是本发明提供的标签的清点方法流程图； 如下所示：
S401 : 阅读器发送清点命令；
S402: 标签反射第一应答信息， 其中包括前同步码、 libit随机数 RN11 和 CRC5;
S403: 阅读器判断是否能正确解码第一应答信息得到 RN11 ; 如果能够 在前同步码之后正确解码得到 16bit的数据，而且按照 CRC5校验确定 16bit 的数据无误， 就会认为得到了正确的 RN11和 CRC5 , 继续进行步骤 S404; 如果无法正确解码得到 16bit数据或是校验出错， 则认为发生碰撞， 返回步 骤 S401 , 继续下面的清点过程。
S404: 阅读器发送 ACK命令， 其中携带标签的解码后的随机数 RN11 , 以确认标签的识别信息；
S405: 标签收到 ACK命令后，确认 ACK携带的解码后的随机数 RN11 与自身的 RN11—致，向阅读器反射第二应答信息，其中包括标签 ID信息； S406: 阅读器收到标签的第二应答信息后， 如果能够确认标签 ID信息 是正确的， 说明这个标签的信息是正确的， 执行 S407; 如果没有收到标签 应答的 ID信息或是 ID信息校验有误，那么说明标签应答 ID信息的过程中 出错， 返回步骤 4重新发送 ACK命令；
S407: 完成清点过程， 标签退出清点流程。
标签退出清点流程后， 阅读器整体的清点流程如果没有结束， 则继续 进行下一步的清点。 本发明提供了一种一种标签， 用于构造第一应答信息， 所述第一应答 信息包括前同步码、 随机数 RN和 CRC校验码； 所述前同步码用于实现阅 读器帧同步； 所述随机数 RN用于标识标签； 所述 CRC校验码用于验证第 一应答信息完整性。
在所述第一应答信息中， 随机数 RN为 libit, CRC校验码为 5bit。 在所述第一应答信息中， 随机数 RN为 16bit, CRC校验码为 16bit。 综上所述可见， 本发明的清点方法应用于包括阅读器和标签的射频识 别系统， 该方法包括： 接收到阅读器发送的清点命令后， 标签反射用于解 码校验的第一应答信息； 接收到所述第一应答信息后， 阅读器在能够正确 解码该第一应答信息的情况下发送解码后的 RN; 接收到所述解码后的 RN 后， 标签在确认该 RN与自身的 RN—致的情况下反射第二应答信息， 所述 第二应答信息包括标签 ID信息； 接收到所述第二应答信息后， 阅读器在其 中所包含的标签 ID信息正确的情况下确认清点完成。
本发明的清点系统包括阅读器和标签； 其中， 所述阅读器， 用于在能 够正确解码来自标签的第一应答信息的情况下发送解码后的 RN; 以及接收 到来自标签的第二应答信息后， 在其中所包含的标签 ID信息正确的情况下 确认清点完成； 所述标签， 用于在接收到阅读器发送的清点命令后反射用 于解码校验的第一应答信息； 以及在接收到解码后的 RN、 并且确认该 RN 与自身的 RN—致的情况下反射第二应答信息，所述第二应答信息包括标签 ID信息。
无论是方法还是系统， 本发明技术都能够在清点过程中传输较少的数 据量， 在相同传输速率下的传输时间少； 且在传输过程中， 能更快的发现 传输错误， 因此， 提高清点过程中标签应答的效率， 降低清点损耗的时间 和能量。
以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于 本领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精 神和原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明 的保护范围之内。

Claims

权利要求书
1、 一种射频识别系统中标签的清点方法， 应用于包括阅读器和标签的 射频识别系统， 其特征在于， 该方法包括：
接收到阅读器发送的清点命令后， 标签反射用于解码校验的第一应答 信息；
接收到所述第一应答信息后， 阅读器在能够正确解码该第一应答信息 的情况下发送解码后的 RN;
接收到所述解码后的 RN后，标签在确认该 RN与自身的 RN—致的情 况下反射第二应答信息， 所述第二应答信息包括标签 ID信息；
接收到所述第二应答信息后， 阅读器在其中所包含的标签 ID信息正确 的情况下确认清点完成。
2、 根据权利要求 1所述的清点方法， 其特征在于， 所述第一应答信息 中包括 RN和 CRC校验码， 所述阅读器正确解码的过程包括：
所述阅读器正确解码得到所述 RN,且按照所述 CRC校验码校验正确。
3、 根据权利要求 2所述的清点方法， 其特征在于， 接收到所述第一应 答信息后， 该方法进一步包括， 所述阅读器不能正确解码 RN和 /或 CRC校 验码校验错误， 所述阅读器重新发送清点命令。
4、 根据权利要求 1或 2所述的清点方法， 其特征在于， 在收到所述第 二应答信息后， 该方法进一步包括， 所述阅读器没有获取到所述标签 ID 信息和 /或标签 ID信息有误， 所述阅读器重新发送解码后的 RN。
5、 根据权利要求 1或 2所述的清点方法， 其特征在于， 所述第一应答 信息进一步包括前同步码。
6、 根据权利要求 1所述的清点方法， 其特征在于， 解码后的所述 RN 由 ACK命令携带。
7、 根据权利要求 2所述的清点方法， 其特征在于， 在所述第一应答信 息中， RN为 libit, CRC校验码为 5bit。
8、 一种射频识别系统中标签的清点系统， 其特征在于， 包括阅读器和 标签； 其中，
所述阅读器， 用于在能够正确解码来自标签的第一应答信息的情况下 发送解码后的 RN; 以及接收到来自标签的第二应答信息后， 在其中所包含 的标签 ID信息正确的情况下确认清点完成；
所述标签， 用于在接收到阅读器发送的清点命令后反射用于解码校验 的第一应答信息； 以及在接收到解码后的 RN、 并且确认该 RN 与自身的 RN一致的情况下反射第二应答信息，所述第二应答信息包括标签 ID信息。
9、 根据权利要求 8所述的清点系统， 其特征在于， 所述第一应答信息 中包括 RN和 CRC校验码， 所述阅读器进一步用于：
接收到所述第一应答信息、并且不能正确解码 RN和 /或 CRC校验码校 验错误时， 重新发送清点命令。
10、 根据权利要求 8或 9所述的清点系统， 其特征在于， 所述阅读器 进一步用于：
在收到所述第二应答信息、并且没有获取到所述标签 ID信息和 /或标签 ID信息有误时， 重新发送解码后的 RN。
11、 根据权利要求 8所述的清点系统， 其特征在于， 在所述第一应答 信息中， RN为 libit, CRC校验码为 5bit; 或者， RN为 16bit, CRC校验 码为 16bit。
PCT/CN2009/076147 2009-08-21 2009-12-28 射频识别系统中标签的清点方法及清点系统 WO2011020278A1 (zh)

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