System for fast macrodiversity switching in mobile wireless networks

• US 7,613,463 B2
• Filed: 10/03/2008
• Issued: 11/03/2009
• Est. Priority Date: 12/28/2000
• Status: Expired due to Fees

• Current Assignee: Rateze Remote Mgmt. L.L.C. (Intellectual Ventures LLC)
• Original Assignee: Northstar Acquisitions LLC (Intellectual Ventures LLC)
• Inventors: Koepf, Gerhard Albert, Chillariga, Gopal, Ghoshtagore, Ujjal Kumar, Uyehara, Lance Kazumi, Dharia, Bhupal Kanaiyalal, Kaushal, Rohit
• Primary Examiner(s): Rampuria; Sharad
• Application Number:
  US12/245,515
• Publication Number:
  US 20090029713A1
• Time in Patent Office: 396 Days
• Field of Search: 455/422.1, 455446-448, 455450-4522, 370/337, 370/347, 375/132
• US Class Current: 455/450
• 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

Fast macrodiversity switching (FMS) dynamically switches radio links used for traffic and control channels for a mobile station among a number of base transceiver stations (BTS) without changing the radio resource, that is, using the same frequency and time slot combination (TDMA) or frequency and spreading code combination (CDMA). The traffic channel switching is under control of zone managers. Each BTS includes a zone manager where a host BTS has its zone manager designated as a host zone manager and other BTSs (assistant BTSs) have their zone managers designated as assistant zone managers. The control by the host and assistant zone managers includes switching down-link signals to and up-link signals from mobile stations among base transceiver stations which include broadcast channels (non-switched) and dedicated (switched) channels. Measurements of the wireless signals are made at macrodiverse locations. Zone managers process the measurements to determine preferred ones of the transceiver stations for particular dedicated channels for a particular mobile station.

Claims

1. An apparatus comprising:

a zone manager including;

an interface unit configured to receive measurement information one or more additional zone managers and from a corresponding transceiver, wherein the zone manager is configured to act as a host zone manager for at least one mobile station configured to transmit unlink signals to and receive downlink signals from a communications system, the communications system including the host zone manager and the one or more additional zone managers, and wherein the one or more additional zone managers are configured to act as assistant zone managers for the host zone manager;

a processing unit configured to process said measurement information to determine preferred ones of a plurality of transceivers to provide dedicated channels for communication with the mobile station, wherein communication over said dedicated channels includes the use of a first radio resource, and wherein the plurality of transceivers includes the corresponding transceiver and one or more additional transceivers each associated with a corresponding one of the one or more additional zone managers; and

a control unit configured to dynamically switch said dedicated channels between said preferred ones of the plurality of transceivers during communication with the mobile station over said dedicated channels, wherein said dynamic switching is performed without changing the first radio resource.

2. The apparatus as recited in claim 1, wherein said measurement information is based on up-link signals transmitted from said mobile station.

3. The apparatus as recited in claim 1, wherein a plurality of zone managers including the host zone manager and the one or more additional zone managers are interconnected with each other in order to form a network.

4. The apparatus as recited in claim 3, wherein, during communications with a particular one of a plurality of mobile stations, one of said plurality of zone managers is configured to act as a host zone manager and one or more additional ones of the zone managers act as assistant zone managers, wherein a zone manager acting as a host zone manager for the particular one of the plurality of mobile stations is configured to communicate over broadcast channels with said particular one of the plurality of mobile stations while particular dedicated channels associated with said particular one of the plurality of mobile stations are dynamically switched among the zone managers acting as said assistant zone managers and said host zone manager for said particular one of said plurality of mobile stations.

5. The apparatus as recited in claim 1, wherein said control unit is configured to switch said dedicated channels based on an indication received from said processing unit.

6. The apparatus as recited in claim 1, wherein said control unit is configured to issue broadcaster commands for controlling the downlink signals to each of selected ones of a plurality of mobile stations and further configured to issue collector commands for controlling a plurality of macrodiverse collectors for changing the uplink signals for each of other selected ones of said plurality of mobile stations.

7. The apparatus as recited in claim 1, wherein the communication system and the mobile station are each configured to transmit said wireless signals based on multiple access protocols.

8. The apparatus as recited in claim 7, wherein the communication system and the mobile station are each configured to transmit said wireless signals based on TDMA protocols.

9. The apparatus as recited in claim 7, wherein the communication system and the mobile station are each configure to transmit said wireless signals based on CDMA protocols.

10. The apparatus as recited in claim 7, wherein the communication system and the mobile station are each configured to transmit said wireless signals based on SDMA protocols using smart antennas.

11. The apparatus as recited in claim 7, wherein the communication system and the mobile station are each configured to transmit said wireless signals based on FDMA protocols.

12. The apparatus as recited in claim 1, wherein each of said plurality of transceivers is configured to communicate over a region containing one or more zones and wherein said measurement information is based upon measurements from one or more collectors in one or more of said plurality of transceiver.

13. The apparatus as recited in claim 1, wherein each of said plurality of transceivers include broadcaster controllers configured to control broadcaster transmitters, wherein a broadcaster controller associated with the host zone manager is configured to select one or more broadcaster transmitters for forward communications with the mobile station based on information received from said processing unit.

14. The apparatus as recited in claim 2, wherein said processing unit is configured to integrate a plurality of measurements over an integration length and further configured to form integrated measurement reports.

15. The apparatus as recited in claim 2, wherein at least a portion of said measurement information is based on uplink signals received by collectors at macrodiverse locations.

16. The apparatus as recited in claim 15, wherein said measurement information is based on at least one of the following types of measurements:

signal strength measurements;

error rate measurements;

distance measurements indicating a distance between the mobile station and one or more of the plurality of transceivers.

17. The apparatus as recited in claim 15, wherein said measurement information includes information regarding radio link conditions between the mobile station and one or more of the plurality of transceivers, wherein said information regarding radio link conditions include one or more of the following types of information:

path loss information;

forward error rate information;

carrier to interference ratio information.

18. The apparatus as recited in claim 15, wherein the zone manager and each of the one or more additional zone managers is associated with a corresponding measurement unit each configured to perform measurements upon which said measurement information is generated.

19. The apparatus as recited in claim 1, wherein the control unit is coupled to the processing unit, and wherein the control unit includes a resource manager and an airlink controller.

20. The apparatus as recited in claim 19, wherein the resource manager is configured to control a plurality of radio sources for communications with a plurality of mobile stations, wherein said controlling includes enabling dynamic switching of dedicated channels among the plurality of transceivers.

21. The apparatus as recited in claim 19, wherein the resource manager is configured to track usage of all radio resources available to the corresponding transceiver.

22. The apparatus as recited in claim 19, wherein, wherein the processing unit is configured to generate a resource request, and wherein, responsive to the request, the resource manager is configured to check a priority level of the request and availability of a particular radio resource capable of meeting the request.

23. The apparatus as recited in claim 22, wherein the resource manager includes a database configured to store usage information pertaining to the radio resources available to the corresponding transceiver, and wherein the resource manager is configured to update the database responsive to the resource manager granting the request.

24. The apparatus as recited in claim 20, wherein the first radio resource is one of the plurality of radio resources, and wherein each of the plurality of radio resources comprise one of the following combinations:

a frequency and time slot combination;

a frequency and spreading code combination.

25. The apparatus as recited in claim 19, wherein the airlink controller is configured to control radio links between one or more of the plurality of transceivers and the mobile station, and wherein the airlink controller is further configured to control radio links between one or more additional mobile stations and one or more of the plurality of transceivers.

26. The apparatus as recited in claim 1, wherein the interface unit is coupled to the control unit and the processing unit, wherein the interface unit includes a zone manager-to-zone manager interface unit configured to provide an interface between the zone manager and at least one of the one or more additional zone managers, and a transceiver interface unit configured to provide an interface to the corresponding transceiver.

27. The apparatus as recited in claim 1, wherein the processing unit is configured to monitor one or more control channels, wherein said control channels include dedicated control channels and broadcast control channels.

28. The apparatus as recited in claim 1, wherein the processing unit is configured to control dynamic switching speed.

29. The apparatus as recited in claim 1, wherein the processing unit is configured to control aggregation when two or more of the plurality of transceivers are communicating with the mobile station.

30. The apparatus as recited in claim 1, wherein the processing unit is configured to extract radio link quality measurements for the mobile station based on said measurement information.

31. The apparatus as recited in claim 1, wherein the processing unit is configured to compare measurement information for the corresponding transceiver and at least one additional one of the plurality of transceivers in order to determine said preferred ones of a plurality of transceivers to provide dedicated channels for communication with the mobile station.

32. The apparatus as recited in claim 31, wherein the processing unit is configured to determine to switch a dedicated channel from a first one of the plurality of transceivers to a second one of the plurality of transceivers based on two consecutive measurement reports indicating that the second one of the plurality of transceivers provides a higher quality radio link than the first one of the plurality of transceivers.

33. The apparatus as recited in claim 1, wherein the zone manager is configured to act as a host zone manager for one or more additional mobile stations.

34. The apparatus as recited in claim 1, wherein the zone manager is configured to act as an assistant zone manager for at least one of the one or more additional zone managers.

35. The apparatus as recited in claim 1, wherein the communications system is a cellular communications system, and wherein the mobile station is a mobile cellular communications device.

36. The apparatus as recited in claim 35, wherein the mobile cellular communications device is a mobile telephone.

37. The apparatus as recited in claim 1, wherein the zone manager is co-located with the corresponding transceiver.

38. The apparatus as recited in claim 1, wherein the zone manager is implemented in a base station controller, and wherein each of the one or more additional zone managers are also implemented in the base station controller.

39. A method comprising:

receiving, at a host zone manager, measurement information from a corresponding transceiver and from one or more assistant host zone managers;

the host zone manager processing the measurement information to determine preferred ones of a plurality of transceivers to be used in providing dedicated channels for communication with a mobile station, wherein communication over said dedicated channels includes the use of a first radio resource, and wherein the plurality of transceivers includes the corresponding transceiver and one or more additional transceivers each associated with a corresponding one of the one or more assistant zone managers; and

the host zone manager dynamically switching, based on said processing, said dedicated channels between said preferred ones of the plurality of transceivers during communication with the mobile station over said dedicated channels, wherein said dynamic switching is performed without changing the first radio resource.

40. The method as recited in claim 39, wherein at least a portion of said measurement information is based on uplink signals received by collectors at macrodiverse locations.

41. The method as recited in claim 40, wherein said measurement information is based on at least one of the following types of measurements:

signal strength measurements;

error rate measurements;

distance measurements indicating a distance between the mobile station and one or more of the plurality of transceivers.

42. The method as recited in claim 40, wherein said measurement information includes information regarding radio link conditions between the mobile station and one or more of the plurality of transceivers, wherein said information regarding radio link conditions include one or more of the following types of information:

path loss information;

forward error rate information;

carrier to interference ratio information.

43. The method as recited in claim 39, further comprising controlling a plurality of radio resources for communications with a plurality of mobile stations, wherein said controlling includes enabling dynamic switching of dedicated channels among the plurality of transceivers.

44. The method as recited in claim 43 further comprising tracking usage of all radio resources available to the corresponding transceiver.

45. The method as recited in claim 43, further comprising generating a resource request and, responsive to the request, checking a priority level of the request and an availability of a particular radio resource capable of meeting the resource request.

46. The method as recited in claim 45, further comprising storing, in a database, usage information pertaining to each of the plurality of radio resources available to the corresponding transceiver.

47. The method as recited in claim 46, further comprising updating the database responsive to granting the resource request.

48. The method as recited in claim 43, wherein the first radio resource is one of the plurality of radio resources, and wherein each of the plurality of radio resources comprise one of the following combinations:

a frequency and time slot combination;

a frequency and spreading code combination.

49. The method as recited in claim 39, further comprising controlling radio links between one or more of the plurality of transceivers and the mobile station, and further comprising controlling radio links between one or more of the plurality of transceivers and one or more additional mobile stations.

50. The method as recited in claim 39, further comprising monitoring one or more control channels, wherein the control channels include dedicated control channels and broadcast control channels.

51. The method as recited in claim 39, further comprising controlling dynamic switching speed.

52. The method as recited in claim 39, further comprising controlling aggregation, wherein during said aggregation, two or more of the plurality of transceivers are communicating with the mobile station.

53. The method as recited in claim 39, further comprising extracting radio link quality measurements for the mobile station based on said measurement information.

54. The method as recited in claim 39 further comprising comparing measurement information for the corresponding transceiver and at least one additional one of the plurality of transceivers in order to determine preferred ones of the plurality of transceivers to provide dedicated channels for communication with the mobile station.

55. The method as recited in claim 54, further comprising determining to switch a dedicated channel from a first one of the plurality of transceivers to a second one of the plurality of transceivers based on two consecutive measurement reports indicating that a second one of the plurality of transceivers provides a higher quality radio link than the first one of the plurality of transceivers.

56. The method as recited in claim 39, further comprising the host zone manager acting as a host for one or more additional mobile stations.

57. The method as recited in claim 39, further comprising the host zone manager acting as an assistant zone manager for one or more additional zone managers.

58. The method as recited in claim 39, wherein the host zone manager and the one or more assistant zone managers are part of a cellular communications system, and wherein the mobile station is a mobile cellular device.

59. The method as recited in claim 58, wherein the mobile station is a mobile telephone.

60. A communications station comprising:

a transceiver including one or more broadcasters and one or more collectors, wherein the broadcasters are configured to transmit downlink signals to a mobile station, and wherein the collectors are configured to receive uplink signal from the mobile station, wherein the transceiver is one of a plurality of transceivers in a communications system;

a zone manager coupled to the transceiver, wherein the zone manager is configured to act as a host zone manager for communications with the mobile station, and wherein the zone manager is configured to;

receive measurement information from the transceiver and from each of one or more additional zone managers acting as assistant zone managers, wherein each of the additional zone managers is associated with a corresponding one of the plurality of transceivers;

process the measurement information in order to determine preferred ones of the plurality of transceivers to provide dedicated channels for communication with the mobile station wherein communication over said dedicated channels includes the use of a first radio resource; and

dynamically switch said dedicated channels between said preferred ones of the plurality of transceivers during communication with the mobile station over said dedicated channels, wherein said dynamic switching is performed without changing the first radio resource.

61. The communications station as recited in claim 60, wherein at least a portion of said measurement information is based on uplink signals received by collectors at macrodiverse locations, wherein each of the collectors is associated with a corresponding one of the plurality of transceivers.

62. The communications station as recited in claim 61, wherein said measurement information is based on at least one of the following types of measurements:

signal strength measurements;

error rate measurements;

distance measurements indicating a distance between the mobile station and one or more of the plurality of transceivers.

63. The communications station as recited in claim 61, wherein said measurement information includes information regarding radio link conditions between the mobile station and one or more of the plurality of transceivers, wherein said information regarding radio link conditions include one or more of the following types of information:

path loss information;

forward error rate information;

carrier to interference ratio information.

64. The communications station as recited in claim 60, wherein the zone manager includes:

an interface unit configured to couple the zone manager to the transceiver and to one or more of the additional zone managers;

a processing unit configured to process the measurement information; and

a control unit configured to perform said dynamic switching.

65. The communications station as recited in claim 64, wherein the control unit includes a resource manager and an airlink controller.

66. The communications station as recited in claim 65, wherein the resource manager is configured to:

control a plurality of radio resources for a plurality of mobile stations, wherein said controlling includes enabling dynamic switching of dedicated channels among the plurality of transceivers;

track usage of all radio resources available to the transceiver, wherein usage information is stored in a database of the resource manager;

check a priority level and availability of a radio resource responsive to a request for a radio resource generated by the processing unit; and

update the database responsive to granting the request.

67. The communications station as recited in claim 65, wherein the airlink controller is configured to control radio links between the mobile station and one or more of the plurality of receivers and further configured to control radio links between one or more additional mobile stations and one or more of the plurality of transceivers.

68. The communications station as recited in claim 64, wherein the processing unit is configured to:

monitor one or more control channels, wherein the control channels include dedicated control channels and broadcast control channels;

control dynamic switching speed;

control aggregation, wherein during aggregation, two or more of the plurality of transceivers are communicating with the mobile station;

extract radio link quality measurements for the mobile station based on said measurement information;

compare measurement information for each of the plurality of transceivers corresponding to one of the host zone manager and assistant zone managers in order to determine said preferred ones of the plurality of transceivers to provide dedicated channels for communications with the mobile station;

and determine a decision to switch a dedicated channel from a first one of the plurality of transceivers to a second one of the plurality of transceivers based on two consecutive measurement reports indicating that the second one of the plurality of transceivers provides a higher quality radio link than the first one of the plurality of transceivers.

69. The communications station as recited in claim 60, wherein the first radio resource is one of the plurality of radio resources, and wherein each of the plurality of radio resources comprise one of the following combinations:

a frequency and time slot combination;

a frequency and spreading code combination.

70. The communications station as recited in claim 60, wherein the communications station is configured to act as a host zone manager for one or more additional mobile stations.

71. The communications station as recited in claim 60, wherein the zone manager is configured to act as an assistant zone manager for at least one of the one or more additional zone managers.

72. A zone manager comprising:

first means for receiving measurement information from one or more additional zone managers and from a corresponding transceiver when said zone manager is acting as a host zone manager for a mobile station, said mobile station being configured to transfer uplink signals to and receive downlink signals from a plurality of transceivers including the corresponding transceiver, and wherein at least one of the one or more additional zone managers acts as an assistant zone manager, and wherein each of the one or more additional zone managers is associated with a corresponding one of the plurality of transceivers;

second means for processing said measurement information to determine preferred ones of a plurality of transceivers to provide dedicated channels for communication with the mobile station, wherein communication over said dedicated channels includes the use of a first radio resource; and

third means for dynamically switching said dedicated channels between said preferred ones of the plurality of transceivers during communication with the mobile station over said dedicated channels, wherein said dynamic switching is performed without changing the first radio resource.

73. A communications system comprising:

a plurality of transceiver stations positioned at macrodiverse locations, wherein each of the plurality of transceivers is configured to transmit downlink signals to and receive uplink signals from one or more mobile stations;

a plurality of zone managers, wherein each of the zone managers corresponds to one of the plurality of transceiver stations, wherein each of the plurality of zone managers includes;

an interface unit coupling the zone manager to its corresponding transceiver and one or more other ones of the plurality of zone managers;

a processing unit configured to process measurement information received via the interface unit in order to determine preferred ones of a plurality of transceivers to provide dedicated channels for communication with a particular one of the one or more mobile stations, wherein communication over said dedicated channels includes the use of a first radio resource; and

a control unit configured to dynamically switch said dedicated channels between said preferred ones of the plurality of transceivers during communication with the mobile station over said dedicated channels, wherein said dynamic switching is performed without changing the first radio resource.