This Part (ISO/IEC ) of the ISO/IEC Standard has been To be ISO compliant a reader has to support either Mode 1 or. Feb 27, —RFID vendors are developing tags and readers that will operate with the ISO Mode 3 (3M3) standard and the EPC HF RFID Air Interface . Performance Comparison of ISO and. CDMA Based RFID Tag Anti- Collision. Protocols. Chetna Dabas 1, 2. 1 Jaypee Institute of Information.
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The target markets for MODE 2 are in tagging systems for manufacturing, logistics, retail, transport and airline baggage. MODE 2 is especially suitable for high speed bulk conveyor fed applications. Power is transferred from the interrogator to the tag by a high-frequency magnetic field using coupled antennae isp in the reader and the tag.
The powering field frequency is After receiving a valid command the tag transmits a reply in response to the command.
ISO/IEC – Wikipedia
The air interface operates as a full-duplex communication link. The interrogator operates with full-duplex transmissions being able to transmit commands while simultaneously receiving multiple tag replies.
Tags operate with half-duplex transmissions. Commands are transmitted from the interrogator to the tag by phase-jitter modulation PJM  of the powering field. PJM transmits data as very small phase changes in the powering field.
There is no reduction in the transfer of power to the tag during PJM, and the bandwidth of PJM is no wider than the original double-sided spectrum of the data. The PJM sideband levels and data rates are decoupled, allowing the sideband levels to be set at any arbitrary level without affecting the data rate. The command data rate is Tags reply to the interrogator by inductive coupling whereby the voltage across the tag antenna coil is modulated by a subcarrier.
Tags, Readers Compliant With the ISO 18000-3M3 Standard Expected Soon
The subcarrier is derived from division of the powering field frequency. The reply data rate is To ensure that tags replying on different channels are simultaneously received, tag replies are band-limited to reduce data 1800-03 subcarrier harmonic levels. Multiple-tag identification is performed using a combination of frequency-division multiple access and time-division multiple access FTDMA. In response to a valid izo each tag randomly selects a channel on which to transmit its reply.
The reply is transmitted once using the selected channel. Upon receiving the next valid jso each tag randomly selects a new channel and transmits the reply using the newly selected channel. This method of reply frequency hopping using random channel selection is repeated for each subsequent valid command. The interrogator can selectively mute identified tags to remove them from the identification process.
When a tag is muted, the tag will not transmit any replies. In addition to random channel selection the tags can randomly mute individual replies.
When a reply is muted, the tag will not transmit that reply. Random muting is necessary when identifying very large populations of tags during singulation.
All commands are time-stamped, and tags store the first time stamp received after entering an interrogator.
The stored time stamp defines precisely when the tag first entered the interrogator and provides a high-resolution method of determining tag order, which is decoupled from the speed of identification. Primary applications are in RFID tags for use in gaming, healthcare, pharmaceuticals, document and media management. From Wikipedia, the free encyclopedia. Parameters for air interface communications at Handbook of EID Security: Concepts, Practical Experiences, Technologies.
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