Method and system for delivery of assistance data

• US 7,903,620 B2
• Filed: 07/16/2004
• Issued: 03/08/2011
• Est. Priority Date: 07/17/2003
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Rahman, Shamim Akbar, Hunkeler, Teresa Joanne, Dick, Stephen G., Rudolf, Marian
• Primary Examiner(s): Afshar; Kamran
• Application Number:
  US10/893,625
• Publication Number:
  US 20050053043A1
• Time in Patent Office: 2,426 Days
• Field of Search: 455/466, 455/434, 455/435.1, 455/435.2, 455/453.5, 455/455, 455/450, 455/451, 455/454, 455/509, 4554321-4322, 455436-453, 455/507, 455511-515, 455/517, 455524-525, 455328-329, 455331-332, 455/338, 455/350, 370/331, 370/496, 370/522, 370/338, 370328-329, 370/497, 370/347
• US Class Current: 370/338
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method and system is disclosed for providing assistance data to wireless transmit/receive units (WTRUs). The assistance data includes information regarding the access point'"'"'s neighboring access points. The assistance data is transmitted to WTRUs using multicast and/or broadcast type signaling and facilitates ring and handover of WTRUs from one access point to another.

Claims

1. An access point (AP) configured to provide assistance data relating to neighboring access points (APs), the AP comprising:

a processor configured to;

obtain neighbor information relating to a neighboring AP;

generate assistance data based on the neighbor information; and

broadcast a beacon that includes an indicator that indicates a presence of assistance data in the beacon on a condition that the indicator is filled, wherein the assistance data is included in an extended beacon frame and includes channel information, and wherein the indicator indicates an absence of assistance data in the beacon on a condition that the indicator is empty.

2. The AP of claim 1, wherein the processor is configured to include, in the extended beacon frame, information relating to at least one access mode associated with the neighboring AP.

3. The AP of claim 2 wherein the processor is configured to broadcast information related to at least one access mode, and wherein the at least one access mode includes an Institute of Electrical and Electronics Engineers (IEEE) 802.11 access mode.

4. The AP of claim 2 wherein the processor is configured to broadcast information related to at least one access mode, and wherein the at least one access mode includes an Institute of Electrical and Electronics Engineers (IEEE) 802.xx high rate direct sequence spread spectrum (HR-DSSS) mode.

5. The AP of claim 1 wherein the channel information includes a channel on which the neighboring AP is found.

6. The AP of claim 1 wherein the processor is configured to obtain neighbor information relating to the neighboring AP via neighbor information from at least one wireless transmit/receive unit (WTRU) associated with the AP.

7. The AP of claim 1 wherein the processor is further configured:

request neighbor information data from the neighboring AP; and

receive neighbor information data from the neighboring AP.

8. The AP of claim 1 wherein the processor is further configured to:

receive neighbor information from the neighboring AP.

9. The AP of claim 1 wherein the processor is configured to obtain neighbor information that includes quality metrics.

10. The AP of claim 1 wherein the processor is configured to obtain assistance data from wireless transmit/receive units (WTRUs) operating within a physically overlapping area of a basic service set (BSS).

11. The AP of claim 1 wherein the indicator is a one bit indicator in length.

12. A wireless transmit/receive unit (WTRU) configured to receive assistance data relating to neighboring access points (AP)s, the WTRU comprising:

a processor configured to receive a beacon, from an AP, wherein the beacon includes an indicator that indicates a presence of assistance data in the beacon on a condition that the indicator is filled, wherein the assistance data is included in an extended beacon frame and includes channel information, and wherein the indicator indicates an absence of assistance data in the beacon on a condition that the indicator is empty.

13. The WTRU of claim 12 wherein the processor is configured to include, in the extended beacon frame, information relating to at least one access mode associated with a neighboring AP.

14. The WTRU of claim 13 wherein the processor is configured to receive information related to an access mode, and wherein the access mode includes an Institute of Electrical and Electronics Engineers (IEEE) 802.11 access mode.

15. The WTRU of claim 13 wherein the processor is configured to receive information related to an access mode, and wherein the access mode includes an Institute of Electrical and Electronics Engineers (IEEE) 802.xx high rate direct sequence spread spectrum (HR-DSSS) mode.

16. The WTRU of claim 12 wherein the processor is further configured to:

receive a request to provide neighbor information from the AP; and

transmit neighbor information to the AP.

17. The WTRU of claim 12 wherein the processor is further configured to:

request additional neighbor information from a second WTRU; and

receive the additional neighbor information in response to the request.

18. The WTRU of claim 12, wherein the processor is configured to receive an indicator that is a one bit indicator in length.

19. A method for providing assistance data relating to neighboring access points (AP)s to a wireless transmit/receive unit (WTRU), the method comprising:

obtaining neighbor information relating to a neighboring AP;

generating assistance data based on the neighbor information; and

broadcasting a beacon that includes an indicator that indicates a presence of assistance data in the beacon on a condition that the indicator is filled, wherein the assistance data is included in an extended beacon frame and includes channel information and wherein the indicator indicates an absence of assistance data in the beacon on a condition that the indicator is empty.

20. The method of claim 19, wherein the extended beacon frame includes information relating to at least one access mode associated with the neighboring AP.

21. The method of claim 20 wherein the at least one access mode is an Institute of Electrical and Electronics Engineers (IEEE) 802.11 access mode.

22. The method of claim 20 wherein the at least one access mode includes an Institute of Electrical and Electronics Engineers (IEEE) 802.xx high rate direction sequence spread spectrum (HR-DSSS) access mode.

23. The method of claim 19 wherein the channel information includes a channel on which the neighboring AP is found.

24. The method of claim 19 wherein obtaining neighbor information relating to the neighboring AP includes:

receiving neighbor information from at least one WTRU associated with the AP.

25. The method of claim 19 wherein obtaining neighbor information relating to the neighboring AP includes:

requesting neighbor information data from the neighboring AP; and

receiving neighbor information data from neighboring AP.

26. The method of claim 19 wherein obtaining neighbor information includes:

receiving neighbor information from the neighboring AP.

27. The method of claim 19 wherein the indicator is a one bit indicator in length.

28. A method for receiving from an access point (AP) assistance data relating to neighboring access points (APs), the method comprising:

receiving a beacon that includes an indicator that indicates a presence of assistance data in the beacon on a condition that the indicator is filled, wherein the assistance data is included in an extended beacon frame and includes channel information, and wherein the indicator indicates an absence of assistance data in the beacon on a condition that the indicator is empty.

29. The method of claim 28 wherein the extended beacon frame includes information relating to at least one access mode associated with the neighboring AP.

30. The method of claim 29 wherein the at least one access mode is an Institute of Electrical and Electronics Engineers (IEEE) 802.11 access mode.

31. The method of claim 29 wherein the at least one access mode includes an Institute of Electrical and Electronics Engineers (IEEE) 802.xx high rate direction sequence spread spectrum (HR-DSSS) access mode.

32. The method of claim 28 wherein the channel information includes a channel on which the neighboring AP is found.

33. The method of claim 28 wherein obtaining neighbor information relating to the neighboring AP includes:

receiving neighbor information from at least one wireless transmit/receive unite (WTRU) associated with the AP.

34. The method of claim 28 wherein obtaining neighbor information relating to the neighboring AP includes:

requesting neighbor information data from the neighboring AP; and

receiving neighbor information data from the neighboring AP.

35. The method of claim 28 wherein obtaining neighbor information for assisting data includes:

receiving neighbor information from the neighboring AP.

36. The method of claim 28 wherein the indicator is a one bit indicator in length.

37. An access point (AP) configured to provide assistance data relating to neighboring access points (APs), the AP comprising:

a processor configured to obtain neighbor information relating to a neighboring AP and to periodically broadcast a message that includes an indicator that indicates a presence of assistance data in the message on a condition that the indicator is filled, wherein the assistance data includes a number of neighbor APs, identities (IDs) of each neighbor AP, timing information, and information relating to the access mode of each AP.

38. A wireless transmit/receive unit (WTRU) configured to receive assistance data relating to neighboring access points (AP)s, the WTRU comprising:

a receiver configured to periodically receive a message that includes an indicator that indicates a presence of assistance data in the message on a condition that the indicator is filled, wherein the assistance data includes a number of neighbor APs, identities (IDs) of each neighbor AP, timing information, and information relating to the access mode of each AP.