Signal and procedure designs of backscattering devices for a-iot

Patent metadata

Field	Value
Publication number	US-2025150507-A1
Application number	US-202418929876-A
Country	US
Kind code	A1
Filing date	Oct 29, 2024
Priority date	Nov 3, 2023
Publication date	May 8, 2025
Grant date	—

Abstract

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a reader. The reader broadcasts a radio signal indicating an available slot set. The reader transmits an acknowledge (ACK) signal including a decoded sequence to an ambient internet of things (A-IoT) device. The reader receives an identifier from the A-IoT device. The identifier is a reply of the A-IoT device when there is a match between the decoded sequence and a chosen sequence, and the chosen sequence is a random sequence that responds to the radio signal in a random slot chosen from the available slot set.

First claim

What is claimed is:

1 . A method of wireless communication of a reader, comprising:
broadcasting a radio signal indicating an available slot set; transmitting an acknowledge (ACK) signal including a decoded sequence to an ambient internet of things (A-IoT) device; and receiving an identifier from the A-IoT device, wherein the identifier is a reply of the A-IoT device when there is a match between the decoded sequence and a chosen sequence, and the chosen sequence is a random sequence that responds to the radio signal in a random slot chosen from the available slot set.

2 . The method of claim 1 , wherein the reader comprises a user equipment (UE) or a gNodeB (gNB).

3 . The method of claim 2 , wherein when the reader is the UE, the method further comprises:
forwarding the identifier to a base station.

4 . The method of claim 3 , further comprising:
forwarding the random sequence to the base station; and receiving the ACK signal from the base station, wherein the decoded sequence is obtained by the base station decoding the random sequence.

5 . The method of claim 3 , wherein the UE receives from the base station a control signal specifying control parameters when the UE is in a communication process with the A-IoT device.

6 . The method of claim 5 , wherein the control parameters comprise the available slot set.

7 . The method of claim 1 , wherein validity of signals between the reader and the A-IoT device is checked by using a cyclic-redundancy check (CRC).

8 . The method of claim 1 , wherein the radio signal comprises a protocol-control information (PCI) that regulates timing and format of data transmission between the reader and the A-IoT device.

9 . The method of claim 1 , wherein the random sequence is a modulated sequence using FM0 modulation, and is preceded by a preamble sequence.

10 . The method of claim 2 , wherein a reader-to-device (R2D) link from the reader to the A-IoT device employs a modulation scheme including amplitude shift keying (ASK) or on-off keying (OOK), wherein the ASK comprises double sideband amplitude shift keying (DSB-ASK), single sideband amplitude shift keying (SSB-ASK), and partial response amplitude shift keying (PR-ASK).

11 . The method of claim 10 , wherein a first R2D preamble is used for an initial transmission between the UE and the A-IoT device to enable the A-IoT device to synchronize with the UE, a second R2D preamble is used for a start of a signaling after the synchronization between the UE and the A-IoT device, and the second R2D preamble is shorter than the first R2D preamble.

12 . The method of claim 1 , wherein the reader employs Manchester encoding and pulse-interval encoding (PIE) for a reader-to-device (R2D) communication from the reader to the A-IoT device.

13 . A method of wireless communication of an ambient internet of things (A-IoT) device, comprising:
receiving a radio signal indicating an available slot set from a reader; transmitting a random sequence that responds to the radio signal in a random slot chosen from the available slot set; receiving an acknowledge (ACK) signal including a decoded sequence; and transmitting an identifier when there is a match between the decoded sequence and the random sequence.

14 . The method of claim 13 , wherein validity of signals between the reader and the A-IoT device is checked by using a cyclic-redundancy check (CRC).

15 . The method of claim 13 , wherein the radio signal comprises a protocol-control information (PCI) that regulates timing and format of data transmission between the reader and the A-IoT device.

16 . The method of claim 13 , wherein the random sequence is a modulated sequence using FM0 modulation, and is preceded by a preamble sequence.

17 . The method of claim 13 , wherein a device-to-reader (D2R) link from the A-IoT device to the reader employs a modulation scheme including amplitude shift keying (ASK) or phase shift keying (PSK); and/or
the A-IoT device employs a backscatter modulation to alter an antenna's reflection coefficient to transmit data, wherein the A-IoT device selects a modulation format, data encoding, and data rate according to a setting from the reader.

18 . The method of claim 13 , wherein the A-IoT device replies to a command from the reader by using an immediate reply, a delayed reply or an in-process reply, wherein the A-IoT device uses an extended preamble for the delayed reply or the in-process reply.

19 . An apparatus for wireless communication, the apparatus being a reader, comprising:
a memory; and at least one processor coupled to the memory and configured to: broadcast a radio signal indicating an available slot set; transmit an acknowledge (ACK) signal including a decoded sequence to an ambient internet of things (A-IoT) device; and receive an identifier from the A-IoT device, wherein the identifier is a reply of the A-IoT device when there is a match between the decoded sequence and a chosen sequence, and the chosen sequence is a random sequence that responds to the radio signal in a random slot chosen from the available slot set.

20 . An apparatus for wireless communication, the apparatus being an ambient internet of things (A-IoT) device, comprising:
a memory; and at least one processor coupled to the memory and configured to: receiving a radio signal indicating an available slot set from a reader; transmitting a random sequence that responds to the radio signal in a random slot chosen from the available slot set; receiving an acknowledge (ACK) signal including a decoded sequence; and transmitting an identifier when there is a match between the decoded sequence and the random sequence.

Assignees

• Mediatek Inc

Inventors

• Cheng Chien-Chun
• Chuang Chiao-Yao
• Wu Wei-De
• Tsai Chiou-Wei
• Tsai Tai-Cheng

Classifications

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04L67/12 Primary

  specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks · CPC title

• H04L5/0055 Primary

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title