Predictive collision avoidance in macrodiverse wireless networks with frequency hopping using switching

• US 7,724,803 B2
• Filed: 11/28/2005
• Issued: 05/25/2010
• Est. Priority Date: 12/28/2000
• Status: Expired due to Fees

• Current Assignee: Northstar Acquisitions LLC (Intellectual Ventures LLC)
• Original Assignee: Northstar Acquisitions LLC (Intellectual Ventures LLC)
• Inventors: Dhar, Naveen, Xiao, Jingqing, Koepf, Gerhard Albert, Ghoshtagore, Ujjal Kumar, Uyehara, Lance Kazumi
• Primary Examiner(s): Fan; Chieh M
• Assistant Examiner(s): Joseph; Jaison
• Application Number:
  US11/288,657
• Publication Number:
  US 20060078039A1
• Time in Patent Office: 1,639 Days
• Field of Search: 375/132, 375/133, 375/134, 375/135, 375/136, 375/137, 370/347, 370/350, 370/480, 455/452
• US Class Current: 375/132
• CPC Class Codes: H04B 1/7143 Arrangements for generation of hop patterns
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 2001/7154 with means for preventing interference
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/0602 using antenna switching H04B7/0686 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 36/08 Reselecting an access point

Abstract

A communication system using fast macrodiversity switching (FMS) and frequency hopping (FH) for wireless signals including downlink signals to and uplink signals from mobile stations. Frequency hopping sequences are determined for the uplink and downlink signals for the mobile stations. A plurality of transceiver stations employ broadcast channels and dedicated channels for communications with the mobile stations. A zone manager controls fast macrodiversity switching of dedicated channels among the mobile stations while broadcast channels remain unswitched. The zone manager extracts frequency hopping information to form predictions of dedicated channel collisions, and based upon the predictions, controls the dynamic switching of dedicated channels to avoid collisions.

Claims

1. A method comprising:

extracting frequency hopping information from frequency hopping sequences used in communications between a plurality of mobile stations and a plurality of transceiver stations over dedicated channels, wherein the plurality of transceiver stations are positioned at macrodiverse locations relative to each other, and wherein said extracting includes monitoring for one or more channel activation messages, each indicating activation of a dedicated channel;

forming a collision prediction of radio channel interference between first and second dedicated channels, said first dedicated channel providing communications between a first one of the plurality of mobile stations and a first one of the plurality of transceiver stations, and said second dedicated channel providing communications between a second one of the plurality of mobile stations and the first transceiver station, and wherein said forming includes tracking hopping frequencies for each of the plurality of mobile stations over a prediction period; and

responsive to said collision prediction, dynamically switching said first dedicated channel to provide communications between the first mobile station and a second one of the plurality of transceiver stations to avoid said radio channel interference.

2. The method of claim 1, and wherein said switching is performed by a zone manager.

3. The method of claim 1 further comprising transmitting said frequency hopping information among particular ones of a plurality of management units.

4. The method of claim 1 further comprising establishing said prediction period to have a duration of at least one frame length.

5. The method of claim 1 further comprising establishing said prediction period to have a duration of at least one frame length in response to a user definition received from one of the plurality of mobile stations.

6. The method of claim 1 wherein said forming the collision prediction further includes comparing the hopping frequencies of radio resources for selected ones of said plurality of mobile stations to predict collision occurrences among various ones of said plurality of mobile stations.

7. The method of claim 1 wherein said radio channel interference is co-channel interference.

8. The method of claim 1 wherein said radio channel interference is adjacent channel interference.

9. The method of claim 1 further comprising calculating a set of burst frequencies for use over the prediction period.

10. The method of claim 9 wherein said calculating further includes updating the set of burst frequencies by calculating an updated set of burst frequencies for use over the prediction period, said calculating the updated set occurring at a frame rate.

11. The method of claim 9 further comprising comparing burst frequencies assigned for use by guest radio resources during a particular prediction period with burst frequencies assigned for use by home radio resources during the particular prediction period.

12. The method of claim 3 wherein said transmitting further includes transmitting collision signaling information in order to modify said dynamic switching and avoid a predicted collision.

13. The method of claim 12 wherein said collision signaling information includes an indicia representative of a location of the predicted collision.

14. The method of claim 13 wherein said indicia includes at least one of a frame number or a time of occurrence for a frame.

15. The method of claim 1 wherein said switching further includes switching one or more dedicated channels to an alternate radio resource for a duration of at least a single burst.

16. The method of claim 1 wherein said switching further includes switching one or more dedicated channels to an alternate radio resource for a duration of at least a sequence of bursts.

17. A method comprising:

extracting frequency hopping information from frequency hopping sequences used in communications over dedicated channels between a plurality of mobile stations and a plurality of transceiver stations, wherein said plurality of transceiver stations are positioned at macrodiverse locations relative to each other;

forming a collision prediction of radio channel interference between first and second dedicated channels, said first dedicated channel providing communications between a first one of the plurality of mobile stations and a first one of the plurality of transceiver stations, and said second dedicated channel providing communications between a second one of the plurality of mobile stations and the first transceiver station, and wherein said forming includes;

tracking hopping frequencies for each of the plurality of mobile stations over a prediction period; and

calculating a set of burst frequencies for use over the prediction period; and

updating the set of burst frequencies by calculating an updated set of burst frequencies over the prediction period, wherein said calculating the updated set occurs at a frame rate; and

responsive to said collision prediction, dynamically switching said first dedicated channel to provide communications between the first mobile station and a second one of the plurality of transceiver stations to avoid said radio channel interference.

18. The method of claim 17, further comprising transmitting frequency hopping information among selected ones of a plurality of control units.

19. The method of claim 18, wherein said transmitting further includes transmitting collision signaling information in order to modify said dynamic switching and avoid a predicted collision.

20. The method of claim 17, further comprising establishing said prediction period as to have a duration of at least one frame length.

21. The method of claim 17, wherein said forming the collision prediction further includes comparing the hopping frequencies of radio resources for selected ones of said plurality of mobile stations to predict collision occurrences among various ones of said plurality of mobile stations.

22. The method of claim 17, further comprising comparing burst frequencies assigned for use by guest radio resources during a particular prediction period with burst frequencies assigned for use by home radio resources during the particular period.

23. The method of claim 17, wherein said switching further includes switching one or more dedicated channels to an alternate radio resource for a duration of at least a single burst.

32. The management unit of claim 17, wherein the switching control unit is further configured to switch one or more dedicated channels to an alternate radio resource for a duration of at least a single burst.

34. The management unit of claim 32, wherein the management unit includes a management unit-to-management unit interface, and wherein the management unit is configured to transmit frequency hopping information to selected ones of a plurality of management units via the management unit-to-management unit interface.

36. The management unit of claim 32, wherein the collision prediction unit is configured to form the collision prediction for a prediction period having a duration of at least one frame length.

38. The management unit of claim 32, wherein the collision prediction unit is further configured to compare burst frequencies assigned for use by guest radio resources during a particular prediction period with burst frequencies assigned for use by home radio resources during the particular prediction period.

39. The management unit of claim 32, wherein the switching control unit is further configured to switch one or more dedicated channels to an alternate radio resource for a duration of at least a single burst.

24. A management unit for a wireless communications system, the management unit comprising:

a hopping extraction unit configured to extract frequency hopping information from frequency hopping sequences used in communications between first and second ones of a plurality of mobile stations and a first one of a plurality of transceiver stations over first and second dedicated channels, respectively, wherein extracting frequency hopping information includes monitoring for a presence of one or more channel activation messages, each indicating activation of a dedicated channel, and wherein the plurality of transceiver stations are positioned at macrodiverse locations relative to each other;

a collision prediction unit configured to form a collision prediction of radio channel interference between said first and second dedicated channels, wherein forming a collision prediction includes tracking hopping frequencies for the first and second ones plurality of mobile stations over a prediction period; and

a switching control unit configured, responsive to said collision prediction, to dynamically switch said first dedicated channel to provide communications between the first mobile station and a second one of the plurality of transceiver stations to avoid said radio channel interference.

25. The management unit of claim 24, wherein the management unit includes a management unit-to-management unit interface, and wherein the management unit is configured to transmit frequency hopping information to selected ones of a plurality of management units via the management unit-to-management unit interface.

26. The management unit of claim 25, wherein the management unit is further configured to transmit collision signaling information to the discrete ones of the plurality of management units in order to modify said dynamic switching and avoid a predicted collision.

27. The management unit of claim 24, wherein the collision prediction unit is configured to form the collision prediction for a prediction period having a duration of at least one frame length.

28. The management unit of claim 24, wherein the collision prediction unit is further configured to form the collision prediction based on a comparison of the hopping frequencies of radio resources for selected ones said plurality of mobile stations to predict collision occurrences among various ones of said plurality of mobile stations.

29. The management unit of claim 24, wherein the collision prediction unit is further configured to calculate a set of burst frequencies for use over the prediction period.

30. The management unit of claim 29, wherein the collision prediction unit is further configured to update the set of burst frequencies by calculating an updated set of burst frequencies for use over the prediction period, wherein calculating the updated set occurs at a frame rate.

31. The management unit of claim 29, wherein the collision prediction unit is further configured to compare burst frequencies assigned for use by guest radio resources during a particular prediction period with burst frequencies assigned for use by home radio resources during the particular prediction period.

33. A management unit for a wireless communications system, the management unit comprising:

a hopping extraction unit configured to extract frequency hopping information from frequency hopping sequences used in communications over dedicated channels between a plurality of mobile stations and a plurality of macrodiverse transceiver stations, said communications including communications between a first one of the plurality of mobile stations and a first one of the plurality of transceiver stations over a first dedicated channel and communications between a second one of the plurality of mobile stations and the first transceiver station over a second dedicated channel;

a collision prediction unit configured to;

form a collision prediction of radio channel interference between said first and second dedicated channels;

track hopping frequencies for the plurality of mobile stations, including the first and second mobile stations, over a prediction period;

calculate a set of burst frequencies for use over the prediction period; and

update the set of burst frequencies by calculating an updated set of burst frequencies over the prediction period, wherein calculating the updated set occurs at a frame rate; and

a switching control unit configured to dynamically switch said first dedicated channel to provide communications between the first mobile station and a second one of the plurality of transceiver stations responsive to said prediction in order to avoid said radio channel interference.

35. The management unit of claim 33, wherein the management unit is further configured to transmit collision signaling information to the discrete ones of the plurality of management units in order to modify said dynamic switching and avoid a predicted collision.

37. The management unit of claim 33, wherein the collision prediction unit is further configured to form the collision prediction based on a comparison of the hopping frequencies of radio resources for selected ones of said plurality of mobile stations to predict collision occurrences among various ones of said plurality of mobile stations.