Channel synchronization for wireless systems

• US 8,315,201 B2
• Filed: 12/03/2008
• Issued: 11/20/2012
• Est. Priority Date: 03/11/2008
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Cordeiro, Carlos, Trainin, Solomon
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): Bokhari, Syed M
• Application Number:
  US12/315,471
• Publication Number:
  US 20090232126A1
• Time in Patent Office: 1,448 Days
• Field of Search: 370/337, 370/338, 370/336, 370/312, 455/435.2, 709/223
• US Class Current: 370/324
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H04B 7/0682 using phase diversity (e.g. phase sweeping)
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 92/02 Inter-networking arrangements

Abstract

In some embodiments, a method for mitigating interference between wireless networks is disclosed. A network communications controller, such as a piconet controller that is new to an area, can monitor for and receive inter-network transmission from adjacent networks and the controller can monitor the received transmission and detect a synchronization parameter of the adjacent networks. The parameter can be an inter-network synchronization beacon that is transmitter on a narrowband channel. The controller can select an unoccupied narrowband channel to transmit inter-network synchronization information and the selected an unoccupied wideband channel to conduct intra-network transmissions. The wideband channel can be associated with the narrowband channel. Other embodiments are also disclosed.

Claims

1. A method comprising:

receiving an inter-network transmission;

monitoring the inter-network transmission to detect an inter-network synchronization parameter on a narrowband channel; and

selecting an unoccupied wideband channel to conduct intra-network communications in response to detecting the inter-network synchronization parameter and based on the inter-network synchronization parameter;

wherein detecting, by a sensor, multiple inter-network communication synchronization beacons and not detecting a master inter-network communication, does not trigger a transmission of a master inter-network communication synchronization beacon.

2. The method of claim 1 wherein monitoring comprises scanning narrowband channels to locate an unoccupied channel and acquiring usage of the unoccupied channel by transmitting an inter-network indicator of channel occupation.

3. The method of claim 2 wherein the unoccupied channel is a wideband channel and the indicator is transmitted on a narrowband channel.

4. The method of claim 2 wherein the selecting comprises selecting a narrowband channel to make narrowband inter-network transmissions and the selected narrowband channel has an associated wideband channel, the associated wideband channel utilized to make wideband intra-network transmissions.

5. The method of claim 1 further comprising determining that an active wideband channel contains a single active narrowband channel and utilizing time division to transmit multiple inter-network synchronization beacons on a single channel if the active wideband channel contains a single active narrowband channel.

6. The method of claim 1 wherein monitoring comprises determining if the received at least one intra-network transmission is a master intra-network transmission and selecting comprises utilizing data in the master intra-network transmission to select a wideband channel for intra-network transmissions.

7. The method of claim 1 wherein selecting comprises locating at least one wideband channel that is occupied, the wideband channel occupying a group of frequencies, and transmitting an intra-network communication synchronization beacon on a narrowband channel that does utilize frequencies in the occupied group of frequencies.

8. The method of claim 1 wherein selecting comprises locating at least one wideband channel that is occupied, the occupied wideband channel utilizing a group of frequencies, and responsive to the location transmitting inter-network communication on a narrowband channel utilizing frequencies that are outside the group of utilized frequencies for intra-network communications.

9. The method of claim 1 wherein the inter-network communications have a frequency range from thirty to seventy gigahertz.

10. An apparatus comprising:

a receiver to receive inter-network synchronization transmissions on one or more channels, the inter-network synchronization transmissions including at least one inter-network communication synchronization beacon;

a sensor to identify an unoccupied channel based on the inter-network communication synchronization beacon;

a trigger module to trigger a transmission of a second inter-network communication synchronization beacon, wherein the trigger module does not trigger transmission of a master inter-network communication beacon in response to the sensor detecting multiple inter-network communication synchronization beacons and not detecting a master inter-network communication; and

a transmitter to transmit the second inter-network communication synchronization beacon in response to the trigger.

11. The apparatus of claim 10 wherein the sensor is to identify an unoccupied channel based on information in the inter-network communication synchronization beacon.

12. The apparatus of claim 11 wherein the sensor is to utilize the inter-network communication synchronization beacon to acquire timing offset data related to the unoccupied channel.

13. The apparatus of claim 10 wherein the trigger module is to trigger a transmission of a master inter-network communication synchronization beacon if no master inter-network communication synchronization beacon transmission is detected.

14. The apparatus of claim 10 wherein the transmitter is to transmit data on a wideband channel in response to no master inter-network communication synchronization beacon transmission being detected.

15. The apparatus of claim 10 wherein the trigger module is to trigger data transmissions on a predetermined wideband channel in response to the reception of the inter-network communication synchronization beacon.

16. A computer program product including a computer readable storage medium, wherein the computer readable storage medium does not comprise a transitory signal, the computer readable storage medium including instructions that, when executed by a processor, cause the computer to:

receive at least one inter-network transmission;

monitor the received inter-network transmission to detect a parameter of the at least one inter-network communication synchronization beacon on a narrowband channel; and

select an unoccupied channel to conduct communications in response to detection of the parameter and based on the parameter;

wherein detection, by a sensor, of multiple inter-network communication synchronization beacons and no detection of a master inter-network communication, does not trigger transmission of a master inter-network communication synchronization beacon.

17. The computer program product of claim 16, that when executed by a processor causes the computer to scan narrowband channels to locate an unoccupied channel and to acquire usage of the unoccupied channel by transmitting an indicator of acquired usage of the unoccupied channel.

18. The computer program product of claim 16, that when executed by a processor causes the computer to determine that the unoccupied channel is a wideband channel and causes the computer to transmit the indicator on a narrowband channel.

19. The computer program product of claim 16, that when executed by a processor causes the computer to select a narrowband channel, to create a narrowband intra-network transmission, to select a narrowband channel that has an associated wideband channel and to make at least one wideband intra-network transmission.