Coordination in wireless networks having devices with different physical layer transmission schemes

• US 8,233,505 B2
• Filed: 02/15/2008
• Issued: 07/31/2012
• Est. Priority Date: 02/15/2007
• 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: Birru, Dagnachew, Chou, Chun-Ting, Seyedi, Alireza
• Primary Examiner(s): Pezzlo, John
• Application Number:
  US12/526,363
• Publication Number:
  US 20100189053A1
• Time in Patent Office: 1,628 Days
• Field of Search: 370/252, 370/329, 370/503
• US Class Current: 370/503
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A wireless network (300) operates with at least two different types of wireless devices, including Type-A wireless devices (320) that communicate using a first transmission scheme and Type-B wireless devices (310) that communicate using a second transmission scheme. Type-A wireless devices (320) can transmit Type-A beacons (325) using the first transmission scheme. Type-B wireless devices (310) can transmit and receive Type-B beacons (315) using the second transmission scheme. Type-B wireless devices (310) can also transmit Type-A beacons (325) using the first transmission scheme, but cannot receive the Type-A beacons (325). Before establishing communications in a new channel, a Type-B wireless device (310) performs power sensing to detect the presence of any non-Type-B wireless devices (200), and if such wireless devices (200) are detected, it switches to another channel. Otherwise, it transmits a Type-A beacon (325) and a Type-B beacon (315) to establish communications in the channel.

Claims

1. A wireless device adapted to communicate in a wireless network, the wireless device comprising:

a transmitter adapted to transmit beacons of a first type using a first transmission scheme that cannot be received by the wireless device, and further adapted to transmit beacons of a second type using a second transmission scheme that is different than the first transmission scheme; and

a receiver adapted to receive the beacons of the second type using the second transmission scheme.

2. The wireless device of claim 1, wherein, when the wireless device desires to operate in a new channel, the receiver first performs power sensing to determine if the channel is being used by any other wireless device that operates using any transmission scheme different from the second transmission scheme, and when the wireless device determines from the power sensing that the channel is not being used by any other wireless device, then searching the channel for any beacons of the second type.

3. The wireless device of claim 2, wherein when the wireless device detects beacons of the second type in the channel, then the wireless device transmits a beacon of the first type using the first transmission scheme and a beacon of the second type using the second transmission scheme in an existing superframe of the channel.

4. The wireless device of claim 2, wherein when the wireless device does not detect any beacons of the second type in the channel, then the wireless device establishes a superframe in the channel and transmits via the superframe a beacon of the first type using the first transmission scheme and a beacon of the second type using the second transmission scheme.

5. The wireless device of claim 1, wherein when the wireless device determines from the power sensing that the channel is being used by another wireless device that operates using a transmission scheme different from the second transmission scheme, then the wireless device switches to another channel and the receiver performs a new power sensing operation in the other channel.

6. The wireless device of claim 1, wherein the transmitter is further adapted to transmit beacons of a third type using a third transmission scheme that cannot be received by the wireless device.

7. In a wireless network adapted to include at least two different types of wireless devices including Type-A wireless devices adapted to communicate using a first transmission scheme and Type-B wireless devices adapted to communicate using a second transmission scheme, a method of communication by a Type-B wireless device comprising:

testing the availability of a first communication channel by performing a power sensing operation to determine whether the channel is being used by any other wireless device that operates using a transmission scheme different from the second transmission scheme;

when the power sensing indicates that the channel is being used by another wireless device that operates using a transmission scheme different from the second transmission scheme, then switching to another channel and performing a new power sensing operation in the other channel; and

when the power sensing indicates that that the channel is not being used by any other wireless device that operates using a transmission scheme different from the second transmission scheme, then transmitting a beacon of a first type using the first transmission scheme that cannot be received by the Type-B wireless device, and transmitting a beacon of a second type using the second transmission scheme, wherein the second transmission scheme is different from the first transmission scheme.

8. The method of claim 7, wherein transmitting the beacon of the first type using the first transmission scheme and the beacon of the second type using the second transmission scheme, comprises:

searching the channel for any beacons of the second type; and

when the wireless device detects beacons of the second type in the channel, then transmitting the beacon of the first type using the first transmission scheme and transmitting the beacon of the second type using the second transmission scheme in an existing superframe of the channel.

9. The method of claim 7, wherein transmitting the beacon of the first type using the first transmission scheme and the beacon of the second type using the second transmission scheme, comprises:

searching the channel for any beacons of the second type; and

when the wireless device does not detect any beacons of the second type in the channel, then establishing a superframe in the channel and transmitting via the superframe the beacon of the first type using the first transmission scheme and the beacon of the second type using the second transmission scheme.

10. The method of claim 7, further comprising when the power sensing indicates that the channel is not being used by any other wireless device that operates using a transmission scheme different from the second transmission scheme, then transmitting beacons of a third type using a third transmission scheme that cannot be received by the wireless device.

11. The method of claim 7, wherein the system is adapted to include K different types of wireless devices that are adapted to communicate using one of K different types of transmission schemes (K>

2), and further comprising when the power sensing indicates that the channel is not being used by any other wireless device that operates using a transmission scheme different from the second transmission scheme, then transmitting K different beacons using all K transmission schemes, wherein K−

1 of the beacons cannot be received by the wireless device.

12. In a wireless network adapted to include at least two different types of wireless devices including Type-A wireless devices adapted to communicate using a first transmission scheme and Type-B wireless devices adapted to communicate using a second transmission scheme different from the first transmission scheme, a method of communication by a first Type-A wireless device comprising:

searching a channel for any beacons of a first type transmitted using the first transmission scheme that cannot be received by the Type-B wireless devices;

decoding any received beacons of the first type to determine if any wireless devices other than Type-A wireless devices are operating in the channel; and

when no beacons of the first type are received that indicate that any wireless devices other than Type-A wireless devices are operating in the channel, then transmitting in the channel a beacon of the first type using the first transmission scheme that cannot be received by the Type-B wireless devices.

13. The method of claim 12, further comprising when the first Type-A wireless device detects beacons of the first type in the channel indicating that another Type-A wireless device is operating in the channel, then transmitting the beacon of the first type using the first transmission scheme in an existing superframe of the channel.

14. The method of claim 12, further comprising when no beacons of the first type are received in the channel by the first Type-A wireless device, then establishing a superframe, and then transmitting via the superframe the beacon of the first type using the first transmission scheme.

15. The method of claim 12, further comprising when at least one beacon of the first type is received in the channel by the first Type-A wireless device indicating that one or more other wireless devices other than another Type-A wireless device is operating in the channel, then transmitting in the channel the beacon of the first type using the first transmission scheme to reserve a portion of the channel that is not being used by any of the one more other wireless device.

16. The method of claim 12, further comprising when at least one beacon of the first type is received in the channel by the first Type-A wireless device indicating that one or more other wireless devices other than another Type-A wireless device is operating in the channel, then switching to a second channel and searching the second channel for any beacons of the first type transmitted using the first transmission scheme.

17. The method of claim 12, further comprising:

subsequent to establishing communication in the channel using the first transmission scheme, detecting a beacon of the first type indicating a presence of another system of wireless devices in a proximity to the first Type-A wireless device, the system including at least one Type-B wireless device communicating using the second transmission scheme; and

thereafter only utilizing portions of the channel that are not being used by any Type-B wireless devices.

18. The method of claim 12, wherein the system is adapted to include K different types of wireless devices that are adapted to communicate using one of K different types of transmission schemes (K>

2), and further comprising when the channel is not being used by any wireless devices other than Type-A wireless devices, then transmitting K different beacons using all K transmission schemes, wherein K−

1 of the beacons cannot be received by the wireless device.