Shared scanning in distributed networks

• US 7,738,846 B2
• Filed: 08/17/2006
• Issued: 06/15/2010
• Est. Priority Date: 08/17/2006
• Status: Expired due to Fees

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Kaaja, Harald, Salokannel, Juha, Tervonen, Janne
• Primary Examiner(s): Patel; Ajit
• Application Number:
  US11/506,211
• Publication Number:
  US 20080045210A1
• Time in Patent Office: 1,398 Days
• Field of Search: None
• US Class Current: 455/161.1
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Various embodiments are described relating to sharing scanning operations among nodes in a wireless network, such as a WiMedia ultra-wideband (UWB) network. In an example embodiment, a message may be sent from a first node to one or more other nodes in a wireless network indicating that the first node is configured to perform a scanning operation on a wireless medium in substitution of scanning the wireless medium at the one or more other nodes. The wireless medium may be scanned, for example, by the first node to obtain scanning results for the one or more other nodes. The scanning results may be sent, for example, by the first node, to the one or more other nodes.

Claims

1. A method comprising:

sending a message from a first node to one or more other nodes in a wireless network indicating that the first node is configured to perform a scanning operation on a wireless medium in substitution of scanning the wireless medium at the one or more other nodes;

wherein sending the message indicating that the first node is configured to perform a scanning operation comprises sending an information element, wherein the information element includes;

a scanning counter field that includes a counter value that indicates a number of superframes since a last scanning operation or a number of superframes before a next scanning operation at the first node.

2. The method of claim 1 wherein:

the sending the message indicating that the first node is configured to perform a scanning operation comprises sending a beacon including an information element, wherein the information element indicates that the first node is configured to perform the scanning operation on the wireless medium in substitution of scanning the wireless medium at the one or more other nodes.

3. The method of claim 1 wherein:

the information element includes a scanning frequency field.

4. The method of claim 3 wherein:

the scanning frequency field includes an indication of an average scanning frequency of the first node.

5. The method of claim 1 wherein:

the information element includes a scanning zone field.

6. The method of claim 5 wherein:

the scanning zone field includes an indication of one or more portions of a superframe scanned by the first node or an indication of one or more subgroups of a group of superframes scanned by the first node.

7. The method of claim 1 further comprising:

receiving a request message at the first node indicating a request from one of the one or more other nodes to perform the scanning operation.

8. The method of claim 7 wherein:

the receiving the request message comprises receiving the request message including an indication of a scanning frequency associated with the one of the other nodes.

9. The method of claim 7 wherein:

the receiving the request message comprises receiving the request message at the first node, the request message including a counter value that indicates a time period or a number of superframes since a last scanning operation or a time period or a number of superframes before a next scanning operation.

10. The method of claim 7 wherein:

the sending the message from the first node comprises sending a response message indicating that the first node is configured to perform the scanning operation on the wireless medium in substitution of scanning the wireless medium at the one of the other nodes, in response to the receiving the request message.

11. The method of claim 7 wherein:

the sending the message from the first node comprises sending a response message indicating an average scanning frequency associated with the first node or a scanning counter.

12. The method of claim 1 wherein:

the sending the message indicating that the first node is configured to perform a scanning operation comprises sending a scanning indication message including an average scanning frequency of the first node from the first node in the wireless network to the one or more other nodes in the wireless network.

13. The method of claim 12 wherein:

the sending the message indicating that the first node is configured to perform a scanning operation comprises sending the scanning indication message including the average scanning frequency of the first node and a counter value that indicates a time period or a number of superframes since a last scanning operation or a time period or a number of superframes before a next scanning operation at the first node from the first node in the wireless network to the one or more other nodes in the wireless network.

14. The method of claim 1 further comprising:

scanning the wireless medium to obtain scanning results for the one or more other nodes; and

sending the scanning results to the one or more other nodes.

15. The method of claim 14 wherein:

the sending the scanning results comprises sending a beacon including a scanning result information element to the one or more other nodes.

16. The method of claim 15 wherein:

the scanning result information element includes scanning information associated with one or more devices associated with an alien beacon group that is different from a first node beacon group that includes the first node and the one or more other nodes.

17. The method of claim 14 wherein:

the sending the scanning results comprises sending a distributed reservation protocol (DRP) message indicating an alien reservation type to the one or more other nodes.

18. The method of claim 1 further comprising:

making a determination of feasibility for the first node to perform the scanning operation on the wireless medium in substitution of scanning the wireless medium at the one or more other nodes based on a determination of a power source of the first node.

19. The method of claim 1 further comprising:

making a determination of feasibility for the first node to perform the scanning operation on the wireless medium in substitution of scanning the wireless medium at the one or more other nodes based on a distance or signal strength between the first node and the one or more other nodes.

20. The method of claim 1 further comprising:

making a determination of feasibility for the first node to continue performing the scanning operation on the wireless medium in substitution of scanning the wireless medium at the one or more other nodes based on an indication of an alien beacon group.

21. The method of claim 1 wherein:

the wireless network includes a distributed wireless network, wherein control of the wireless network is distributed among the first node and the one or more other nodes.

22. An apparatus for wireless communications, the apparatus comprising:

a controller;

a memory coupled to the controller; and

a wireless transceiver coupled to the controller;

the apparatus adapted to;

send a message via the wireless transceiver to indicate that the apparatus is configured to perform a scanning operation on a wireless medium in substitution of scanning the wireless medium at any of one or more devices receiving the message;

wherein the message includes an information element; and

wherein the information element includes;

a scanning zone field that includes an indication of one or more portions of a plurality of portions of a superframe scanned by the apparatus or an indication of one or more apparatus subgroups of a plurality of groups of a superframe scanned by the apparatus.

23. The apparatus of claim 22 wherein:

the message includes a beacon including an information element, wherein the information element indicates that the apparatus is configured to perform the scanning operation on the wireless medium in substitution of scanning the wireless medium at the any of one or more devices receiving the message.

24. The apparatus of claim 22 wherein:

the information element includes a scanning frequency field.

25. The apparatus of claim 24 wherein:

the scanning frequency field includes an indication of an average scanning frequency of the apparatus.

26. The apparatus of claim 22 wherein:

the information element includes a scanning counter field.

27. The apparatus of claim 26 wherein:

the scanning counter field includes a counter value that indicates a time period or a number of superframes since a last scanning operation or a time period or a number of superframes before a next scanning operation at the apparatus.

28. The apparatus of claim 22 further adapted to:

receive a request message indicating a request from one of the any of one or more devices receiving the message to perform the scanning operation.

29. The apparatus of claim 28 wherein:

the request message includes an indication of a scanning frequency associated with one of the any of one or more devices.

30. The apparatus of claim 22 further adapted to:

scan the wireless medium to obtain scanning results for the any of one or more devices; and

send the scanning results to the any of one or more devices.

31. The apparatus of claim 30 wherein:

the scanning results comprise a scanning result information element included in a beacon sent to the any of one or more devices.

32. The apparatus of claim 31 wherein:

the scanning result information element includes scanning information associated with one or more devices associated with an alien beacon group that is different from a first node beacon group that includes the apparatus and the any of one or more devices receiving the message.

33. The apparatus of claim 30 further adapted to:

send the scanning results via a distributed reservation protocol (DRP) message indicating an alien reservation type.