信息技术.项目管理用射频识别.第6部分:空气接口参数从860 MHz至960 MHz的通信

[中文适用范围]： ISO/IEC 18000 的这一部分定义了在项目管理应用中使用的在 860 MHz 至 960 MHz 工业、科学和医疗 (ISM) 频段运行的射频识别 (RFID) 设备的空中接口。 它提供了 RFID 设备的通用技术规范，可供制定 RFID 应用标准的 ISO 委员会使用。 ISO/IEC 18000 的这一部分旨在实现兼容性并鼓励国际市场中不断增长的 RFID 市场产品的互操作性。 它定义了技术属性的前向和返回链路参数，包括但不限于工作频率、工作信道精度、占用信道带宽、最大有效各向同性辐射功率（EIRP）、杂散发射、调制、占空比、数据编码、比特速率、比特率精度、比特传输顺序，以及在适当的情况下，操作信道、跳频速率、跳频序列、扩频序列和码片速率。 它进一步定义了空中接口中使用的通信协议。 ISO/IEC 18000 的这一部分规定了无源反向散射、询问器优先对话 (ITF) 或标签听后对话 (TOTAL) RFID 系统的物理和逻辑要求。 该系统包括询问器和标签（也称为标签）。 询问器通过向标签发送连续波 (CW) RF 信号来接收来自标签的信息；标签通过调制其天线的反射系数来做出响应，从而将信息信号反向散射到询问器。 该系统是ITF，意味着标签只有在询问器指示后才用信息信号调制其天线反射系数，或TOTAL，意味着标签在进入询问器场时用信息信号调制其天线反射系数首先侦听询问器调制以确定系统是否为 ITF 后。 具体来说，ISO/IEC 18000的这一部分包含一种模式四种类型。 四种类型之间的详细技术差异如相关参数表所示。 A、B 和 C 型是 ITF。 A 类在前向链路中使用脉冲间隔编码 (PIE) 和自适应 ALOHA 冲突仲裁算法。 B 类在前向链路中使用曼彻斯特和自适应二叉树冲突仲裁算法。 C 型在前向链路中使用 PIE 和随机时隙冲突仲裁算法。 类型 D 是基于脉冲位置编码或 Miller M=2 编码子载波的 TOTAL。 ISO/IEC 18000 的这一部分规定了 ?询问器和标签之间的物理交互（通信链路的信令层）， ?询问器和标签操作程序和命令， ?用于在多标签环境中识别特定标签的冲突仲裁方案。 [外文原描述]： ISO/IEC 18000-6:2010 defines the air interface for radio frequency identification (RFID) devices operating in the 860 MHz to 960 MHz Industrial, Scientific, and Medical (ISM) band used in item management applications. It provides a common technical specification for RFID devices that can be used by ISO committees developing RFID application standards. ISO/IEC 18000-6:2010 is intended to allow for compatibility and to encourage inter-operability of products for the growing RFID market in the international marketplace. It defines the forward and return link parameters for technical attributes including, but not limited to, operating frequency, operating channel accuracy, occupied channel bandwidth, maximum effective isotropic radiated power (EIRP), spurious emissions, modulation, duty cycle, data coding, bit rate, bit rate accuracy, bit transmission order, and, where appropriate, operating channels, frequency hop rate, hop sequence, spreading sequence, and chip rate. It further defines the communications protocol used in the air interface. ISO/IEC 18000-6:2010 specifies the physical and logical requirements for a passive-backscatter, Interrogator-Talks-First (ITF) or tag-talks-only-after-listening (TOTAL) RFID system. The system comprises Interrogators, and tags, also known as labels. An Interrogator receives information from a tag by transmitting a continuous-wave (CW) RF signal to the tag; the tag responds by modulating the reflection coefficient of its antenna, thereby backscattering an information signal to the Interrogator. The system is ITF, meaning that a tag modulates its antenna reflection coefficient with an information signal only after being directed to do so by an Interrogator, or TOTAL, meaning that a tag modulates its antenna reflection coefficient with an information signal upon entering an Interrogator's field after first listening for Interrogator modulation in order to determine if the system is ITF or not. In detail, ISO/IEC 18000-6:2010 contains one mode with four types. The detailed technical differences between the four types are shown in the associated parameter tables. Types A, B and C are ITF. Type A uses Pulse-Interval Encoding (PIE) in the forward link and an adaptive ALOHA collision-arbitration algorithm. Type B uses Manchester in the forward link and an adaptive binary-tree collision-arbitration algorithm. Type C uses PIE in the forward link and a random slotted collision-arbitration algorithm. Type D is TOTAL based on Pulse Position Encoding or Miller M=2 encoded subcarrier. ISO/IEC 18000-6:2010 specifies physical interactions (the signalling layer of the communication link) between Interrogators and tags, Interrogator and tag operating procedures and commands, the collision arbitration scheme used to identify a specific tag in a multiple-tag environment.