# US 2010/0166113 A1 · Receiver state estimation in a duty cycled radio

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- Number: US 2010/0166113 A1
- Document ID: US20100166113A1
- Status: Published application
- Kind: A1
- Application number: 12/647,672
- Filed: 2009-12-28
- Published: 2010-07-01
- Earliest claimed: 2008-12-25
- Assignees: Google Inc.
- Inventors: Matthew John Farley; LaMonte Peter Koop
- Web page: https://patentgrep.com/patent/US20100166113A1

## CPC

- H04W 52/0235: {where the received signal is a power saving command}
- H04W 28/0247: {based on conditions of the access network or the infrastructure network (central resource management H04W28/16)}
- 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)
- 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

A method for receiver state estimation includes communicating, from a first communications device to a second communications device, a first plurality of wake-up frames; receiving, at the first communications device from the second communications device, an indication of a received wake-up frame of the communicated first plurality of wake-up frames; determining, by the first communications device, a time at which the second communications device is in a ready state based on the received indication; subsequently communicating, from the first communications device to the second communications device, a second plurality of wake-up frames. The first plurality is greater than the second plurality, the reduction in number from the first plurality to the second plurality being based on the determined time at which the second communications device is in a ready state.

## Claims

### Claim at position 1

1-18. (canceled)

### Claim 19

A method for receiver state estimation comprising:
(a) communicating, from a first communications device to a second communications device, a first plurality of wake-up frames;
(b) receiving, at the first communications device from the second communications device, an indication of a received wake-up frame of the communicated first plurality of wake-up frames;
(c) determining, by the first communications device, a time at which the second communications device is in a ready state based on the received indication;
(d) subsequently communicating, from the first communications device to the second communications device, a second plurality of wake-up frames;
(e) wherein the first plurality is greater than the second plurality, the reduction in number from the first plurality to the second plurality being based on the determined time at which the second communications device is in a ready state.

### Claim 20 (depends on 19)

The method of claim 19, wherein the first communications device and the second communications device each comprise a remote sensor node (RSN).

### Claim 21

A method for receiver state estimation comprising:
(a) communicating, from a first communications device to a second communications device, a first plurality of wake-up frames;
(b) receiving, at the first communications device from the second communications device, an indication of a received wake-up frame of the communicated first plurality of wake-up frames;
(c) determining, by the first communications device, an offset time relative to a clock of the first communications device based on the received indication;
(d) subsequently communicating, from the first communications device to the second communications device, a second plurality of wake-up frames;
(e) wherein the first plurality is greater than the second plurality, the reduction in number from the first plurality to the second plurality being based on the determined offset time.

### Claim 22 (depends on 21)

The method of claim 21, wherein the first communications device and the second communications device each comprise a remote sensor node (RSN).

### Claim 23 (depends on 21)

The method of claim 21, further comprising the step of storing the offset time at the first communications device.

### Claim 24 (depends on 19)

The method of claim 19, wherein the wake-up frames comprise wake-up messages.

### Claim 25 (depends on 19)

The method of claim 19, wherein the wake-up frames of the second plurality of wake-up frames are numbered in descending order.

### Claim 26 (depends on 19)

The method of claim 19, wherein, after the numbering of the wake-up frames has descended to zero, a message is transmitted.

### Claim 27

A system, comprising:
(a) a first communications device configured to communicate, to a second communications device, a first plurality of wake-up frames;
(b) a second communications device configured to, based upon receipt of one or more wake-up frames of the first plurality of wake-up frames, communicate an indication of a received wake-up frame to the first communications device;
(c) wherein the first communications device is further configured to
(i) determine a time at which the second communications device is in a ready state based on the communicated indication, and
(ii) subsequently communicate to the second communications device, a second plurality of wake-up frames;
(d) wherein the first plurality is greater than the second plurality, the reduction in number from the first plurality to the second plurality being based on the determined time at which the second communications device is in a ready state.

### Claim 28 (depends on 19)

The system of claim 19, wherein the first communications device and the second communications device each comprise a remote sensor node (RSN).