APPARATUS AND METHOD FOR MAC LOGICAL CHANNEL SELECTION FOR OPERATING PICONETS IN BODY AREA NETWORKS

• US 20100273419A1
• Filed: 01/15/2010
• Published: 10/28/2010
• Est. Priority Date: 04/23/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Khan, Farooq, Rajagopal, Sridhar
• Granted Patent: US 8,509,688 B2
• Time in Patent Office: Days
• US Class Current: 455/41.200
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/27 between access points
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

A portable device capable of controlling a piconet selects a logical channel when forming the piconet. The device includes a controller configured to start a first piconet. The controller couples to at least one secondary device in the first piconet. The portable device also includes a transmitter configured to communicate with the at least one secondary device via a wireless communication channel. The controller is configured to select communication channel resources based at least in part on resources allocated to a second piconet in order to mitigate interference between the piconets. The controller is configured to form the first piconet to operate in either a non-interference mode when the controller is able to establish communications with a second controller in the second piconet or a coexistence interference mitigation mode when the controller is unable to establish communications with the second controller in the second piconet.

Claims

1. A device for use in a body area network capable of low power communications, the device comprising:

a controller configured to form a first piconet capable of coexisting with a second piconet, the controller further configured to couple to at least one secondary device, the device and a secondary device coupled in the first piconet; and

a transmitter configured to communicate with the secondary device via a wireless communication channel, wherein the controller is configured to select communication channel resources based at least in part on resources allocated to the second piconet, and wherein the controller is configured to form the first piconet to operate in at least one of;

a non-interference mode when the controller is able to establish communications with a second controller in the second piconet; and

an interference mitigation mode when the controller is unable to establish communications with the second controller in the second piconet.

2. The device as set forth in claim 1, wherein the wireless communication channel is an ultra-wide band communication.

3. The device as set forth in claim 1, wherein when operating in the non-interference mode the controller is configured to at least one of:

negotiate with the second controller in the second piconet for communication channel time resources; and

use an offset synchronization method.

4. The device as set forth in claim 3, wherein the controller is configured to operate in a time resource sharing mode such that the second controller in the second piconet adjusts a timing for the second piconet to share time resources with the first piconet.

5. The device as set forth in claim 3, wherein the controller is configured to use a message from the second controller in the second piconet to determine an offset to start the first piconet and at least one of data rates and duty cycles that can be used by the first piconet, and wherein the second controller is configured to limit a data rate for all devices in the second piconet to a certain duty cycle to allow an offset start for the first piconet.

6. The device as set forth in claim 5, wherein the controller is configured to determine the offset such that a gap is allowed for at least one of clock drifting and multipath communications.

7. The device as set forth in claim 1, wherein when controller is configured to use at least one of priority and quality of service sensitivity information received from a second controller in the second piconet to start the first piconet in the coexistence interference mitigation mode.

8. The device as set forth in claim 1, wherein the controller is configured to inform the second piconet controller regarding an intention to start the first piconet in the coexistence interference mitigation mode.

9. The device as set forth in claim 1, wherein the controller is configured to join the second piconet as an associated secondary device.

10. The device as set forth in claim 1, wherein one of the at least one secondary device is disposed in a coverage area of both the first piconet and the second piconet and wherein controller is configured to use one of the at least one secondary device to monitor activities in the second piconet.

11. The device as set forth in claim 1, wherein the controller is configured to receive information regarding additional piconets from the second piconet.

12. The device as set forth in claim 1, wherein the controller is configured to inform the second piconet controller regarding an intention to release a bandwidth used by the first piconet.

13. The device as set forth in claim 1, wherein the controller is configured to form the first piconet in the coexistence interference mitigation mode when the controller receives a denial message from the second controller in the second piconet.

14. The device as set forth in claim 13, wherein in response to receiving a request denied message from the second controller, the controller is configured to search additional logical channels for a best channel to launch.

15. The device as set forth in claim 1, wherein the controller is configured to inform the second controller in the second piconet regarding a decision to terminate the first piconet.

16. For use in a body area network capable of low power wireless communications, a coexistence method for operating a piconet, the coexistence method comprising:

selecting, by a first piconet controller, a first frequency band as an operation frequency band for operation of a first piconet;

scanning at least one channel in the operation frequency band to determine if a second piconet is operating within the at least one channel; and

forming the first piconet based at least in part on a result of the scanning, the first piconet is formed in;

a random mode if the second piconet is not determined to be operating within the at least one channel; and

a coexistence mode if the second piconet is determined to be operating within the at least one channel.

17. The coexistence method as set forth in claim 16, wherein the coexistence mode comprises at least one of:

a non-interference mode when the controller is able to establish communications with a second controller in the second piconet; and

an interference mitigation mode when the controller is unable to establish communications with the second controller in the second piconet.

18. The coexistence method as set forth in claim 17, the non-interference mode comprising at least one of:

negotiating with the second controller in the second piconet for communication channel time resources; and

using an offset synchronization method.

19. The coexistence method as set forth in claim 18, wherein negotiating further comprises establishing a time resource sharing such that the second controller in the second piconet adjusts a timing for the second piconet to share time resources with the first piconet.

20. The coexistence method as set forth in claim 17, wherein using the offset synchronization method further comprises:

receiving a message from the second controller in the second piconet; and

determining, based on the received message, an offset to start the first piconet and at least one of data rates and duty cycles that can be used by the first piconet, and wherein the second controller limits a data rate for all devices in the second piconet to a certain duty cycle to allow an offset start for the first piconet.

21. The coexistence method as set forth in claim 20, wherein determining the offset comprises allowing a gap for at least one of clock drifting and multipath.

22. The coexistence method as set forth in claim 16, further comprising reducing, further comprising in response to receiving a request denied message from the second controller, selecting a second frequency band as the operation frequency band for operation of the first piconet.

23. The coexistence method as set forth in claim 22, wherein selecting a second frequency band further comprises searching additional logical channels for a best channel.

24. The coexistence method as set forth in claim 16, further comprising collecting piconet information regarding at least one adjacent piconet operating in close proximity to the first piconet.

25. The coexistence method as set forth in claim 24, wherein collecting further comprises at least one of:

joining the first piconet controller to the at least one adjacent piconet; and

receiving the piconet information via a secondary device coupled to the first piconet controller, the secondary device disposed in a coverage area of both the first piconet and the at least one adjacent piconet.

26. The coexistence method as set forth in claim 16, further comprising sending, by the first piconet controller, a termination message to a second piconet controller, wherein the termination message comprises information indicating a decision by the first piconet controller to terminate the first piconet.

27. A system that includes a plurality of devices capable of low power wireless communications, wherein a first piconet controller is configured to control communications in an existing piconet;

the system comprising;

a second piconet controller configured to establish a new piconet and control communications in the new piconet to coexist with the existing piconet, wherein the second piconet controller comprises;

a processor configured to form the new piconet and select a logical channel for operation of the new piconet; and

a receiver interface configured to detect a presence of the existing piconet, wherein the processor further is configured to select the logical channel and an operational mode based at least in part on an attribute of the existing piconet, and wherein the processor is configured to form the new piconet to operate in at least one of;

a non-interference mode when the processor is able to establish communications with the first piconet controller; and

an interference mitigation mode when the processor is unable to establish communications with the first piconet controller.