# US 2014/0154985 A1 · Method for controlling bluetooth device for power conservation

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- Number: US 2014/0154985 A1
- Document ID: US20140154985A1
- Status: Published application
- Kind: A1
- Application number: 13/800,004
- Filed: 2013-03-13
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Mediatek Inc.
- Applicants: Mediatek Inc.
- Inventors: Juei-Ting SUN
- Web page: https://patentgrep.com/patent/US20140154985A1

## CPC

- H04W 52/0209: {in 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)
- 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 controlling a Bluetooth device for power conservation includes the steps of: establishing a Bluetooth link; controlling the Bluetooth device to enter sniff mode; handling a sniff anchor point after wakeup preparation and before sleep preparation; and handling a wakeup operation between the wakeup preparation and the sleep preparation. The wakeup/sleep preparation can be also done as few times as possible in the invention such that the power consumption of the Bluetooth device is effectively reduced.

## Claims

### Claim 1

A method for controlling a Bluetooth device, comprising the steps of:
establishing a Bluetooth link;
controlling the Bluetooth device to enter sniff mode;
handling a sniff anchor point after wakeup preparation and before sleep preparation; and
handling a first wakeup operation between the wakeup preparation and the sleep preparation.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the first wakeup operation is a page scan.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the first wakeup operation is an inquiry scan.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the wakeup preparation comprises a clock settling count.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein the wakeup preparation comprises clock compensation.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein the Bluetooth device exchanges packages with a remote device within sniff attempt.

### Claim 7 (depends on 1)

The method as claimed in claim 1, wherein the Bluetooth device does not enter any sleep mode between the wakeup preparation and the sleep preparation.

### Claim 8 (depends on 1)

The method as claimed in claim 1, wherein the sniff anchor point is handled periodically at intervals of a first time period, and the first wakeup operation is performed periodically at intervals of a second time period.

### Claim 9 (depends on 8)

The method as claimed in claim 8, wherein the first time period is substantially equal to the second time period.

### Claim 10 (depends on 8)

The method as claimed in claim 8, wherein the first time period is substantially a multiple of the second time period.

### Claim 11 (depends on 8)

The method as claimed in claim 8, wherein the second time period is substantially a multiple of the first time period.

### Claim 12 (depends on 8)

The method as claimed in claim 8, further comprising:
handling a second wakeup operation between the wakeup preparation and the sleep preparation.

### Claim 13 (depends on 12)

The method as claimed in claim 12, wherein the first wakeup operation is a page scan, and the second wakeup operation is an inquiry scan.

### Claim 14 (depends on 12)

The method as claimed in claim 12, wherein the second wakeup operation is performed periodically at intervals of a third time period.

### Claim 15 (depends on 14)

The method as claimed in claim 14, wherein the first time period is substantially equal to the third time period.

### Claim 16 (depends on 14)

The method as claimed in claim 14, wherein the first time period is substantially a multiple of the third time period.

### Claim 17 (depends on 14)

The method as claimed in claim 14, wherein the third time period is substantially a multiple of the first time period.

### Claim 18

A Bluetooth device, comprising:
an antenna;
an RF (Radio Frequency) module, coupled to the antenna; and
a baseband module, comprising a controller,
wherein the controller controls the RF module to establish a Bluetooth link, to enter sniff mode, to handle a sniff anchor point after wakeup preparation and before sleep preparation, and to handle a wakeup operation between the wakeup preparation and the sleep preparation.

### Claim 19

An electronic device, comprising:
means for establishing a Bluetooth link;
means for entering sniff mode;
means for handling a sniff anchor point after wakeup preparation and before sleep preparation; and
means for handling a wakeup operation between the wakeup preparation and the sleep preparation.