Control of short range RF communication

• US 20020077139A1
• Filed: 12/20/2000
• Published: 06/20/2002
• Est. Priority Date: 12/20/2000
• Status: Active Grant

• Current Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Original Assignee: Stephane Bouet
• Inventors: Bouet, Stephane
• Granted Patent: US 6,879,810 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence

Abstract

A method of and a system for controlling low power radio frequency activity of terminals, including a method of selecting and activating a wireless terminal. A signal, including a transmission indication, is transmitted by a first terminal. A second terminal receives the signal a number of times and compares the received transmission indications with predetermined indication values. When the comparison shows that a predetermined number of satisfactory transmission indications have been received by the second terminal, the second terminal commences transmission. The transmission indication can be messages having tail portions with a preselected set of states.

Claims

1. A method of controlling low power radio frequency activity of terminals, said method comprising the steps of:

transmitting a signal from a first terminal communicating wirelessly with a second terminal, the signal including a transmission indication;

receiving the transmission indication by the second terminal sequentially a multiple number of times, wherein the transmission indication is a radio frequency transmission authorization indication included in control channel information,

comparing the multiple received transmission indications with predetermined indication values; and

in response to the comparison showing that a predetermined number of satisfactory transmission indications have been received by the second terminal, commencing transmission by the second terminal.

2. A method as claimed in claim 1, wherein a parameter of the content of the radio frequency transmission authorization indication of one received message is inverted in relation to a corresponding parameter of the content of a previously received message.

3. A method as claimed in claim 1, further comprising the step in the first terminal of counting the radio frequency transmission authorization indications sent to the second terminal.

4. A method as claimed in claim 1, further comprising the step in the second terminal of counting the radio frequency transmission authorization indications received from the first terminal.

5. A method as claimed in claim 1, further comprising the step in the first terminal of comparing the counted even numbered radio frequency transmission authorization indications which are sent to the second terminal.

6. A method as claimed in claim 5, further comprising the step in the first terminal of sending the comparison result to the second terminal when the comparison result is equal to a predetermined value.

7. A method as claimed in claim 1, further comprising the step in the first terminal of comparing the counted odd numbered radio frequency transmission authorization indications which are sent to the second terminal.

8. A method as claimed in claim 7, further comprising the step in the first terminal of sending the comparison result transmission to the second terminal when the comparison result is equal to a predetermined value.

9. A method as claimed in claim 1, further comprising the step in the second terminal of comparing the counted even numbered radio frequency transmission authorization indications received from the first terminal.

10. A method as claimed in claim 9, further comprising the step in the second terminal of sending the comparison result to the first terminal when the comparison result is equal to a predetermined value.

11. A method as claimed in claim 1, further comprising the step in the second terminal of comparing the counted odd numbered radio frequency transmission authorization indications received from the first terminal.

12. A method as claimed in claim 11, comprising the step in the second terminal of sending the comparison result to the first terminal when the comparison result is equal to a predetermined value.

13. A method as claimed in claim 1, further comprising downloading a content product to a memory in the second terminal.

14. A method of selecting and activating a wireless terminal, comprising the steps of delivering a series of messages to the wireless terminal, each message including a payload portion in response to which a particular terminal is selected;

and a tail portion having first and second states, each state being indicative of a corresponding payload condition, wherein;

the tail portion is inverted for at least a first one of said series of messages with respect to the tail portion for another one of said series of messages, the wireless terminal being activated in response to said inversion having a first set of states each being indicative of a corresponding payload condition, and

said first set of states for at least one of said series of messages is inverted to provide a second set of states, such that said previously selected terminal is activated in response to changes in said sets.

15. A system for sending a specific signal from a first Bluetooth device to another Bluetooth devices comprising, said system comprising:

a master device for sending an inquiry request message having an access code that includes Lower Address Parts (LAPs) encapsulated in identification packets, wherein;

the LAPs identify a type of Bluetooth device that is to reply to the inquiry request message, and

the identification packet contains a trailer that is linked to the parity of the most significant bit of the LAP, whereby the trailer serves as an indicator for transmission authorisation.