METHOD OF RECOVERING COMMUNICATION ACCESS IN DYNAMIC SPECTRUM ACCESS WIRELESS SYSTEMS

• US 20090040986A1
• Filed: 09/14/2006
• Published: 02/12/2009
• Est. Priority Date: 09/16/2005
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Cordeiro, Carlos, Challapali, Kiran
• Granted Patent: US 8,873,470 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 1/22 using redundant apparatus to increase reliability
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26
• CPC Class Codes: H04W 16/06 Hybrid resource partitioning, e.g. channel borrowing
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A wireless system and method including a medium access control (MAC) layer adapted to recover service in restricted channels.

Claims

1. In a wireless communication network, a method of wireless communication, comprising:

determining a backup channel from a plurality of restricted channels; and

notifying a plurality of wireless stations (STAs) in the wireless communication network of the backup channel.

2. A method as recited in claim 1, further comprising, after the notifying, transmitting a command to the STAs.

3. A method as recited in claim 2, wherein the command instructs the STAs to occupy backup channel.

4. A method as recited in claim 1, further comprising, before the notifying, receiving in-band measurements at a base station (BS) from at least one of the plurality of STAs indicative of a presence or an absence of an incumbent device.

5. A method as recited in claim 2, further comprising, after the transmitting, beginning a communication period.

6. A method as recited in claim 5, further comprising, performing out-of-band measurements.

7. A method as recited in claim 6, further comprising, transmitting the out-of-band measurements to a base station (BS).

8. A method as recited in claim 2, further comprising transmitting in-band and out-of-band measurements from at least one of the STAs to the BS during a notification period, wherein each of the STAs waits for period of time after a termination of the notification period to receive the command.

9. A method as recited in claim 8, further comprising, resuming operation in the backup channel if the command is not received in the period of time.

10. A method as recited in claim 2, wherein the command instructs the STAs to terminate transmission if no channels are available.

11. In a wireless communication system, a method of wireless communication, comprising:

transmitting information from wireless stations (STAs) to a base station, wherein the information indicates the operation or absence of operation of an incumbent device in a restricted frequency channel; and

based on the information, transmitting a command to the STAs of the wireless communication system.

12. A method as recited in claim 11, wherein the transmitting of the command is effected during a recovery period.

13. A method as recited in claim 11, wherein, if all restricted channels are occupied, the command instructs the STAs to terminate transmitting data.

14. A method as recited in claim 13, wherein the STAs make measurements of in-band channels and out-of-band channels after receiving the command.

15. A method as recited in claim 14, further comprising transmitting to the BS the availability of at least one of the in-band channels or out-of-band channels.

16. A wireless communication system, comprising:

a base station (BS) adapted to assign a backup channel;

a plurality of wireless communication stations (STAs) adapted to transmit information indicating restricted channels occupied by incumbent device and restricted channels not occupied by incumbent devices to the BS, wherein the BS determines the backup channel from the information.

17. A wireless communication system as recited in claim 16, wherein the STAs are adapted to conduct in-band and out-of-band measurements and the information is based on the measurements.

18. A wireless communication system as recited in claim 16, wherein the BS is adapted to transmit a spectrum management command and the spectrum management command instructs the STAs to switch to the backup channel.

19. A wireless communication system as recited in claim 16, wherein the BS is adapted to transmit a spectrum management command and the spectrum management command instructs the STAs to occupy the restricted channels that are not occupied.

20. A wireless communication system as recited in claim 16, wherein the BS is adapted to transmit a spectrum management command and the spectrum management command instructs the STAs to terminate transmission.