# US 7,411,926 B2 · Repeated channel adaptive frequency hopping

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- Number: US 7,411,926 B2
- Document ID: US7411926B2
- Status: Granted
- Kind: B2
- Application number: 10/004,304
- Filed: 2001-11-02
- Published: 2003-05-08
- Granted: 2008-08-12
- Earliest claimed: 2001-11-02
- Assignees: Texas Instruments Incorporated
- Inventors: Anuj Batra; Kofi Dankwa Anim-Appiah
- Web page: https://patentgrep.com/patent/US7411926B2

## CPC

- H04B 7/2628: {using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] (H04B7/2618 takes precedence)}
- H04B: TRANSMISSION

## Abstract

The invention provides systems, devices, and methods for frequency hopping. In one method embodiment, the invention hops between frequencies by using the same channel to transmit data from a master to a slave, and from the slave to the master. One system embodiment provides an enhanced master coupled to an enhanced slave. In one device embodiment, the invention is a computer readable medium adapted to enable frequency hopping in a frequency band.

## Claims

### Claim 1

A method of communication in a frequency hopping wireless network using a time-division duplex (TDD) scheme having a plurality of time slots divide into a plurality of master-to-slave slots and a plurality of slave-to-master slots, wherein the plurality of master-to-slave slots are even slots and the plurality of slave-to-master slots are odd slots, said method comprising:
coupling an enhanced master device with a slave device without using polling or a handshake;
initiating communication from the master device to the slave device on a channel selected from an original hopping sequence, wherein the master device is only device that can initiate transmissions using only data and not control information;
selecting a channel from a repeated channel adaptive hopping sequence, derived from the original hopping sequence, if the slave device is an enhanced slave device; and
responding to the master device from the slave device on a channel selected from a repeated channel adaptive hopping sequence if the slave device is an enhanced slave device;
responding to the master device from the slave device on a channel selected from the original hopping sequence if the slave device is a legacy slave device,
wherein, at any one time instant, only a single device can be transmitting within the network.

### Claim 2 (depends on 1)

method according to claim 1 wherein the slave responding to the master device comprises:
transmitting a packet to the master device on the selected channel, wherein the selected channel is used for transmission during entire length of the packet.

### Claim 3 (depends on 1)

method according to claim 1 wherein the wireless network is a Bluetooth wireless network.

### Claim 4

A system for communication in a frequency hopping wireless network, said system comprising:
a master device; and
at least one slave device communicatively coupled to the master device, wherein the master device is configured to initiate communication with the slave device on a channel selected from an original hopping sequence without using polling or a handshake, wherein the master device is only device that can initiate transmissions using only data and not control information; and
the slave device is configured to transmit data to the master device in response to the master device initiating the communication on a channel selected from a repeated channel adaptive hopping sequence, derived from the original hopping sequence, if the slave device is an enhanced slave device or on a channel selected from the original hopping sequence if the slave device is a legacy slave device, wherein, at any one time instant, only a single device can be transmitting within the network.

### Claim 5 (depends on 4)

A system according to claim 4 wherein the slave device is further configured to:
transmit a packet to the master device on the selected channel wherein the first channel is used for transmission during entire length of the packet.

### Claim 6 (depends on 4)

A system according to claim 4 wherein the wireless network is a Bluetooth wireless network.