# US 11,445,502 B2 · Method and apparatus for receiving tone signal in synchronous wireless distributed communication system

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- Number: US 11,445,502 B2
- Document ID: US11445502B2
- Status: Granted
- Kind: B2
- Application number: 16/913,617
- Filed: 2020-06-26
- Published: 2020-12-31
- Granted: 2022-09-13
- Earliest claimed: 2019-06-28
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Hyun Gu Hwang
- Web page: https://patentgrep.com/patent/US11445502B2

## CPC

- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04J 3/1694: {Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers (Passive Optical Networks H04Q11/0062)}
- H04W 52/0229: {where the received signal is a wanted signal}
- H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02)
- H04W 92/18: between terminal devices
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

An operation method of a first terminal in a wireless distributed communication system using a synchronous TDMA scheme may comprise configuring a position of a first sub-slot in a frame of an information tone channel; detecting, by the first terminal in a sleep state, a first information tone signal transmitted from a second terminal in the first sub-slot; maintaining a state of the first terminal to the sleep state when the first information tone signal is not detected in the first sub-slot, and transitioning the state of the first terminal to a wake-up state when the first information tone signal is detected in the first sub-slot; and transmitting and receiving, by the first terminal having transitioned to the wake-up state, a data signal to and from the second terminal through a preconfigured data channel.

## Claims

### Claim 1

An operation method of a first terminal in a wireless distributed communication system using a synchronous time division multiple access (TDMA) scheme, the operation method comprising:
configuring a position of a first sub-slot in a frame of an information tone channel,
wherein the position of the first sub-slot is configured based on a mobile communication number of the first terminal and information on a time that an information tone signal is transmitted and received in the information tone channel;
sensing for, by the first terminal in a sleep state, a first information tone signal transmitted from a second terminal in the first sub-slot;
maintaining a state of the first terminal to the sleep state when the first information tone signal is not detected in the first sub-slot, and transitioning the state of the first terminal to a wake-up state when the first information tone signal is detected in the first sub-slot; and
transmitting and receiving, by the first terminal having transitioned to the wake-up state, a data signal to and from the second terminal through a preconfigured data channel,
wherein the information tone channel is a tone channel in which a preconfigured information is mapped to each of sub-slots constituting the frame and a center frequency of the information tone channel is configured to be different from a center frequency for the data channel.

### Claim 2 (depends on 1)

The operation method according to claim 1, further comprising, when the information tone signal is detected in the first sub-slot, transmitting a second information tone signal to the second terminal in a second sub-slot preconfigured in the information tone channel.

### Claim 3

A first terminal in a wireless distributed communication system using a synchronous time division multiple access (TDMA) scheme, the first terminal comprising:
a processor;
a memory electronically communicating with the processor; and
instructions stored in the memory,
wherein when executed by the processor, the instructions cause the first terminal to:
configure a position of a first sub-slot in a frame of an information tone channel, wherein the position of the first sub-slot is configured based on a mobile communication number of the first terminal and information on a time that an information tone signal is transmitted and received in the information tone channel;
sense for, by the first terminal in a sleep state, a first information tone signal transmitted from a second terminal in the first sub-slot;
maintain a state of the first terminal to the sleep state when the first information tone signal is not detected in the first sub-slot, and transition the state of the first terminal to a wake-up state when the first information tone signal is detected in the first sub-slot; and
transmit and receive, by the first terminal having transitioned to the wake-up state, a data signal to and from the second terminal through a preconfigured data channel,
wherein the information tone channel is a tone channel in which a preconfigured information is mapped to each of sub-slots constituting the frame and a center frequency of the information tone channel is configured to be different from a center frequency for the data channel.

### Claim 4 (depends on 3)

The first terminal according to claim 3, wherein the instructions further cause the first terminal to, when the information tone signal is detected in the first sub-slot, transmit a second information tone signal to the second terminal in a second sub-slot preconfigured in the information tone channel.