Transmission and reception without precise timing capability

A ambient Internet of things (A-IoT) device, comprising:

• a transceiver configured to:
• receive a physical reader-to-device channel (PRDCH) from a reader, wherein:
• the PRDCH is preceded by a first signal indicating start-of-signal and a second signal providing synchronization for receiving the PRDCH,
• the PRDCH is followed by a third signal indicating end-of-signal, and
• the PRDCH indicates a reader-to-device (R2D) message type of a corresponding R2D message carried in the PRDCH;
• and
• processing circuitry operably coupled to the transceiver, the processing circuitry configured to determine a transmission timing of a physical device-to-reader channel (PDRCH) to the reader, wherein:
• the PDRCH is preceded by a fourth signal providing synchronization for receiving the PDRCH, and
• the transmission timing of the PDRCH is predefined from an end of the PRDCH,
• wherein the transceiver is further configured to transmit the PDRCH to the reader at the determined transmission timing,
• wherein the PDRCH is transmitted by (i) backscattering an externally provided carrier wave (CW) or (ii) generating the CW internally.

A reader device, comprising:

• a transceiver configured to:
• transmit a physical reader-to-device channel (PRDCH) to an ambient Internet of things (A-IoT) device, wherein:
• the PRDCH is preceded by a first signal indicating start-of-signal and a second signal providing synchronization for receiving the PRDCH,
• the PRDCH is followed by a third signal indicating end-of-signal, and
• the PRDCH indicates a reader-to-device (R2D) message type of a corresponding R2D message carried in the PRDCH;
• and
• a processor operably coupled to the transceiver, the processor configured to determine a reception timing of a physical device-to-reader channel (PDRCH) from the A-IoT device, wherein:
• the PDRCH is preceded by a fourth signal providing synchronization for receiving the PDRCH, and
• the transmission timing of the PDRCH is predefined from an end of the PRDCH,
• wherein the transceiver is further configured to receive the PDRCH from the A-IoT device at the determined reception timing.