Pilot signal set management in a multi-carrier communication system

• US 8,605,801 B2
• Filed: 05/15/2009
• Issued: 12/10/2013
• Est. Priority Date: 05/20/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Rezaiifar, Ramin, Lott, Christopher G., Ghosh, Donna, Black, Peter J., Attar, Rashid Ahmed A.
• Primary Examiner(s): Lugo, David B.
• Application Number:
  US12/466,698
• Publication Number:
  US 20090290652A1
• Time in Patent Office: 1,670 Days
• Field of Search: 375/260, 375/267, 455/436, 455/440, 455442-444, 455/449, 370/338, 370/343, 370/344
• US Class Current: 375/260
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 36/302 due to low signal strength

Abstract

In a wireless communication system where different frequency bands are deployed to generate various communication zones, pilot signal set management for a plurality of pilot signals generated from an additional coverage zone is based on identifying a preselected signal set from the plurality of pilot signals and determining whether a predetermined criterion is met.

Claims

1. A method of communications operable by an infrastructure entity, comprising:

receiving from a user entity information for a plurality of pilot signal sets;

identifying, among the plurality of pilot signal sets, at least a first pilot signal set and a second pilot signal set from the same additional coverage zone, wherein the additional coverage zone corresponds to one sector or cell that operates under at least a first frequency band that corresponds to the first pilot signal set and a second frequency band that corresponds to the second pilot signal set to generate multi-carrier coverage over the same designated area;

determining that one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion to add the first pilot signal set and the second pilot signal set to an active set of the user entity; and

sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to the active set of the user entity.

2. The method as in claim 1, further comprising:

determining that the first pilot signal set from the additional coverage zone has a stronger signal strength than the second pilot signal set from the additional coverage zone; and

determining that predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined threshold,

wherein the instruction sent to the user entity causes the user entity to first add the first pilot signal set to the active set when the signal strength associated therewith exceeds the predetermined threshold and thereafter add the second pilot signal set to the active set when the signal strength associated therewith exceeds the predetermined threshold.

3. The method as in claim 1, further comprising sending another instruction to the user entity to delete all the pilot signal sets from the additional coverage zone from the active set of the user entity in response to determining that a predetermined criterion to drop the first pilot signal set and the second pilot signal set from the active set of the user entity is met.

4. The method as in claim 1, wherein the additional coverage zone comprises the designated area deployed on top of at least one existent coverage area.

5. The method as in claim 1, wherein at least the first pilot signal set and the second pilot signal set provide additional carriers added on top of at least one existent carrier serving a geographic area that includes the designated area prior to the creation of the additional coverage zone.

6. A method of communications operable by an infrastructure entity, comprising:

receiving from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

identifying a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a weakest signal strength;

determining that a predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined threshold; and

sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

7. A method of communications operable by an infrastructure entity, comprising:

receiving from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

identifying a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a weakest signal strength;

determining that a predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined power level differential over a signal strength corresponding to a pilot signal set from a currently engaged coverage zone; and

sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

8. A method of communications operable by an infrastructure entity, comprising:

receiving from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

identifying a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a strongest signal strength;

determining that a predetermined criterion is met in response to a signal strength corresponding to a pilot signal set from a currently engaged coverage zone falling below a predetermined threshold; and

sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

9. A method of communications operable by a user entity, comprising:

sending information for a plurality of pilot signal sets to an infrastructure entity, wherein the plurality of pilot signal sets include at least a first pilot signal set and a second pilot signal set from the same additional coverage zone, and wherein the additional coverage zone corresponds to one sector or cell that operates under at least a first frequency band that corresponds to the first pilot signal set and a second frequency band that corresponds to the second pilot signal set to generate multi-carrier coverage over the same designated area; and

receiving an instruction from the infrastructure entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to an active set of the user entity when one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion.

10. The method as in claim 9, wherein the additional coverage zone comprises the designated area deployed on top of at least one existent coverage area.

11. The method as in claim 9, wherein at least the first pilot signal set and the second pilot signal set provide additional carriers added on top of at least one existent carrier serving a geographic area that includes the designated area prior to the creation of the additional coverage zone.

12. An infrastructure entity operable in a communication system, comprising:

means for receiving from a user entity information for a plurality of pilot signal sets;

means for identifying, among the plurality of pilot signal sets, at least a first pilot signal set and a second pilot signal set from the same additional coverage zone, wherein the additional coverage zone corresponds to one sector or cell that operates under at least a first frequency band that corresponds to the first pilot signal set and a second frequency band that corresponds to the second pilot signal set to generate multi-carrier coverage over the same designated area;

means for determining that one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion to add the first pilot signal set and the second pilot signal set to an active set of the user entity; and

means for sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to the active set of the user entity.

13. The infrastructure entity as in claim 12, further comprising:

means for determining that the first pilot signal set from the additional coverage zone has a stronger signal strength than the second pilot signal set from the additional coverage zone; and

means for determining that predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined threshold,

wherein the instruction sent to the user entity causes the user entity to first add the first pilot signal set to the active set when the signal strength associated therewith exceeds the predetermined threshold and thereafter add the second pilot signal set to the active set when the signal strength associated therewith exceeds the predetermined threshold.

14. The infrastructure entity as in claim 12, further comprising means for sending another instruction to the user entity to delete all the pilot signal sets from the additional coverage zone from the active set of the user entity in response to determining that a predetermined criterion to drop the first pilot signal set and the second pilot signal set from the active set of the user entity is met.

15. The infrastructure entity as in claim 12, wherein the communication system comprises a heterogeneous deployment.

16. The infrastructure entity as in claim 12, wherein the communication system comprises a macro-cellular deployment.

17. An infrastructure entity operable in a communication system, comprising:

means for receiving from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

means for identifying a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a weakest signal strength;

means for determining that a predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined threshold; and

means for sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

18. An infrastructure entity operable in a communication system, comprising:

means for receiving from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

means for identifying a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a weakest signal strength;

means for determining that a predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined power level differential over a signal strength corresponding to a pilot signal set from a currently engaged coverage zone; and

means for sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

19. An infrastructure entity operable in a communication system, comprising:

means for receiving from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

means for identifying a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a strongest signal strength;

means for determining that a predetermined criterion is met in response to a signal strength corresponding to a pilot signal set from a currently engaged coverage zone falling below a predetermined threshold; and

means for sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

20. A user entity operable in a communication system, comprising:

means for sending information for a plurality of pilot signal sets to an infrastructure entity, wherein the plurality of pilot signal sets include at least a first pilot signal set and a second pilot signal set from the same additional coverage zone, and wherein the additional coverage zone corresponds to one sector or cell that operates under at least a first frequency band that corresponds to the first pilot signal set and a second frequency band that corresponds to the second pilot signal set to generate multi-carrier coverage over the same designated area; and

means for receiving an instruction from the infrastructure entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to an active set of the user entity when one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion.

21. An apparatus operable in a communication system, comprising circuitry configured to:

receive from a user entity information for a plurality of pilot signal sets;

identify, among the plurality of pilot signal sets, at least a first pilot signal set and a second pilot signal set from the same additional coverage zone, wherein the additional coverage zone corresponds to one sector or cell that operates under at least a first frequency band that corresponds to the first pilot signal set and a second frequency band that corresponds to the second pilot signal set to generate multi-carrier coverage over the same designated area;

determine that one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion to add the first pilot signal set and the second pilot signal set to an active set of the user entity; and

send an instruction to the user entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to the active set of the user entity.

22. The apparatus as in claim 21, wherein the circuitry is further configured to:

determine that the first the pilot signal set from the additional coverage zone has a stronger signal strength than the second pilot signal set from the additional coverage zone; and

determine that predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined threshold,

wherein the instruction sent to the user entity causes the user entity to first add the first pilot signal set to the active set when the signal strength associated therewith exceeds the predetermined threshold and thereafter add the second pilot signal set to the active set when the signal strength associated therewith exceeds the predetermined threshold.

23. The apparatus as in claim 21, wherein the circuitry is further configured to send another instruction to the user entity to delete all the pilot signal sets from the additional coverage zone from the active set of the user entity in response to determining that a predetermined criterion to drop the first pilot signal set and the second pilot signal set from the active set of the user entity is met.

24. An apparatus operable in a communication system, comprising circuitry configured to:

receive from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

identify a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a weakest signal strength;

determine that a predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined threshold; and

send an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

25. An apparatus operable in a communication system, comprising circuitry configured to:

receive from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

identify a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone as that has a weakest signal strength;

determine that a predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined power level differential over a signal strength corresponding to a pilot signal set from a currently engaged coverage zone; and

send an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

26. An apparatus operable in a communication system, comprising circuitry configured to:

receive from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

identify a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a strongest signal strength;

determine that a predetermined criterion is met in response to a signal strength corresponding to a pilot signal set from a currently engaged coverage zone falling below a predetermined threshold; and

send an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

27. An apparatus operable in a communication system, comprising circuitry configured to:

send information for a plurality of pilot signal sets to an infrastructure entity, wherein the plurality of pilot signal sets include at least a first pilot signal set and a second pilot signal set from the same additional coverage zone, and wherein the additional coverage zone corresponds to one sector or cell that operates under at least a first frequency band that corresponds to the first pilot signal set and a second frequency band that corresponds to the second pilot signal set to generate multi-carrier coverage over the same designated area; and

receive an instruction from the infrastructure entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to an active set of the user entity when one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion.

28. The apparatus as in claim 27 is a single-frequency apparatus.

29. The apparatus as in claim 27 is a multi-frequency apparatus.

30. A computer program product, comprising a non-transitory computer-readable medium physically embodied with computer-readable program code for:

receiving from a user entity information for a plurality of pilot signal sets;

identifying, among the plurality of pilot signal sets, at least a first pilot signal set and a second pilot signal set from the same additional coverage zone, wherein the additional coverage zone corresponds to one sector or cell that operates under at least a first frequency band that corresponds to the first pilot signal set and a second frequency band that corresponds to the second pilot signal set to generate multi-carrier coverage over the same designated area;

determining that one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion to add the first pilot signal set and the second pilot signal set to an active set of the user entity; and

sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to the active set of the user entity.

31. The computer program product as in claim 30, the non-transitory computer-readable medium further physically embodied with computer-readable program code for:

determining that the first pilot signal set from the additional coverage zone has a stronger signal strength than the second pilot signal set from the additional coverage zone; and

determining that predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined threshold,

wherein the instruction sent to the user entity causes the user entity to first add the first pilot signal set to the active set when the signal strength associated therewith exceeds the predetermined threshold and thereafter add the second pilot signal set to the active set when the signal strength associated therewith exceeds the predetermined threshold.

32. The computer program product as in claim 30, the non-transitory computer-readable medium further physically embodied with computer-readable program code for sending another instruction to the user entity to delete all the pilot signal sets from the additional coverage zone from the active set of the user entity in response to determining that a predetermined criterion to drop the first pilot signal set and the second pilot signal set from the active set of the user entity is met.

33. A computer program product, comprising a non-transitory computer-readable medium physically embodied with computer-readable program code for:

receiving from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

identifying a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a weakest signal strength;

determining that a predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined threshold; and

sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

34. A computer program product, comprising a non-transitory computer-readable medium physically embodied with computer-readable program code for:

receiving from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

identifying a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a weakest signal strength;

determining that a predetermined criterion is met in response to the signal strength associated with the first pilot signal set exceeding a predetermined power level differential over a signal strength corresponding to a pilot signal set from a currently engaged coverage zone; and

sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

35. A computer program product, comprising a non-transitory computer-readable medium physically embodied with computer-readable program code for:

receiving from a user entity information for a plurality of pilot signal sets from an additional coverage zone;

identifying a first pilot signal set among the plurality of pilot signal sets from the additional coverage zone that has a strongest signal strength;

determining that a predetermined criterion is met in response to a signal strength corresponding to a pilot signal set from a currently engaged coverage zone falling below a predetermined threshold; and

sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and a second pilot signal set among the plurality of pilot signal sets from the additional coverage zone to an active set of the user entity.

36. A computer program product, comprising a non-transitory computer-readable medium physically embodied with computer-readable program code for:

sending information for a plurality of pilot signal sets to an infrastructure entity, wherein the plurality of pilot signal sets include at least a first pilot signal set and a second pilot signal set from the same additional coverage zone, and wherein the additional coverage zone corresponds to one sector or cell that operates under at least a first frequency band that corresponds to the first pilot signal set and a second frequency band that corresponds to the second pilot signal set to generate multi-carrier coverage over the same designated area; and

receiving an instruction from the infrastructure entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to an active set of the user entity when one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion.

37. A method of communications operable by an infrastructure entity, comprising:

receiving from a user entity information for a plurality of pilot signal sets;

identifying, among the plurality of pilot signal sets, at least a first pilot signal set and a second pilot signal set from an additional coverage zone that comprises a designated area in which at least the first pilot signal set and the second pilot signal set provide additional carriers added on top of at least one existent carrier serving a geographic area that includes the designated area prior to the creation of the additional coverage zone, wherein the first pilot signal set and the second pilot signal set are from the same additional coverage zone;

determining that one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion to add the first pilot signal set and the second pilot signal set to an active set of the user entity; and

sending an instruction to the user entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to the active set of the user entity, wherein;

the first pilot signal set includes a first parameter that identifies a sector or cell associated with the designated area and a second parameter that represents a first center carrier frequency value at which a transceiver associated with the sector or cell operates,

the second pilot signal set includes a first parameter that identifies the sector or cell associated with the designated area and a second parameter that represents a second center carrier frequency value at which the transceiver associated with the sector or cell operates, and

the first center carrier frequency value and the second center carrier frequency value are different from one another.

38. The method as in claim 37, wherein the geographic area that includes the designated area corresponding to the additional coverage zone does not have any other sectors, cells, or additional coverage zones in a proximal neighborhood to the additional coverage zone that use frequency bands centered at the first or second center carrier frequency values.

39. A method of communications operable by a user entity, comprising:

sending information for a plurality of pilot signal sets to an infrastructure entity, wherein the plurality of pilot signal sets include at least a first pilot signal set and a second pilot signal set from an additional coverage zone that comprises a designated area in which at least the first pilot signal set and the second pilot signal set provide additional carriers added on top of at least one existent carrier serving a geographic area that includes the designated area prior to the creation of the additional coverage zone, wherein the first pilot signal set and the second pilot signal set are from the same additional coverage zone; and

receiving an instruction from the infrastructure entity to add the first pilot signal set from the additional coverage zone and the second pilot signal set from the additional coverage zone to an active set of the user entity when one of the first and second pilot signal sets from the additional coverage zone meet a predetermined criterion, wherein;

the first pilot signal set includes a first parameter that identifies a sector or cell associated with the designated area and a second parameter that represents a first center carrier frequency value at which a transceiver associated with the sector or cell operates,

the second pilot signal set includes a first parameter that identifies the sector or cell associated with the designated area and a second parameter that represents a second center carrier frequency value at which the transceiver associated with the sector or cell operates, and

the first center carrier frequency value and the second center carrier frequency value are different from one another.

40. The method as in claim 39, wherein the geographic area that includes the designated area corresponding to the additional coverage zone does not have any other sectors, cells, or additional coverage zones in a proximal neighborhood to the additional coverage zone that use frequency bands centered at the first or second center carrier frequency values.

41. A method of communications operable by an infrastructure entity, comprising:

determining that one of plural pilot signal sets from an additional coverage zone meets a predetermined criterion, wherein the additional coverage zone operates under multiple different frequency bands that respectively correspond to the plural pilot signal sets to generate multi-carrier coverage over one designated area; and

instructing a user entity to add the plural pilot signal sets from the additional coverage zone to an active set of the user entity in response to the one pilot signal set meeting the predetermined criterion.

42. An infrastructure entity operable in a communication system, comprising:

means for determining that one of plural pilot signal sets from an additional coverage zone meets a predetermined criterion, wherein the additional coverage zone operates under multiple different frequency bands that respectively correspond to the plural pilot signal sets to generate multi-carrier coverage over one designated area; and

means for instructing a user entity to add the plural pilot signal sets from the additional coverage zone to an active set of the user entity in response to the one pilot signal set meeting the predetermined criterion.

43. An apparatus operable in a communication system, comprising circuitry configured to:

determine that one of plural pilot signal sets from an additional coverage zone meets a predetermined criterion, wherein the additional coverage zone operates under multiple different frequency bands that respectively correspond to the plural pilot signal sets to generate multi-carrier coverage over one designated area; and

instruct a user entity to add the plural pilot signal sets from the additional coverage zone to an active set of the user entity in response to the one pilot signal set meeting the predetermined criterion.

44. A computer program product, comprising a non-transitory computer-readable medium physically embodied with computer-readable program code for:

determining that one of plural pilot signal sets from an additional coverage zone meets a predetermined criterion, wherein the additional coverage zone operates under multiple different frequency bands that respectively correspond to the plural pilot signal sets to generate multi-carrier coverage over one designated area; and

instructing a user entity to add the plural pilot signal sets from the additional coverage zone to an active set of the user entity in response to the one pilot signal set meeting the predetermined criterion.

45. A method of communications operable by a user entity, comprising:

receiving an instruction from an infrastructure entity to add plural pilot signal sets from one additional coverage zone to an active set of the user entity, wherein the infrastructure entity transmits the instruction when one pilot signal set from the additional coverage zone meets a predetermined criterion, and wherein the additional coverage zone operates under multiple different frequency bands that respectively correspond to the plural pilot signal sets to generate multi-carrier coverage over one designated area.

46. A user entity operable in a communication system, comprising:

means for receiving an instruction from an infrastructure entity to add plural pilot signal sets from one additional coverage zone to an active set of the user entity, wherein the infrastructure entity transmits the instruction when one pilot signal set from the additional coverage zone meets a predetermined criterion, and wherein the additional coverage zone operates under multiple different frequency bands that respectively correspond to the plural pilot signal sets to generate multi-carrier coverage over one designated area; and

means for adding the plural pilot signal sets to the active set of the user entity.

47. An apparatus operable in a communication system, comprising circuitry configured to:

receive an instruction from an infrastructure entity to add plural pilot signal sets from one additional coverage zone to an active set of the user entity, wherein the infrastructure entity transmits the instruction when one pilot signal set from the additional coverage zone meets a predetermined criterion, and wherein the additional coverage zone operates under multiple different frequency bands that respectively correspond to the plural pilot signal sets to generate multi-carrier coverage over one designated area.

48. A computer program product, comprising a non-transitory computer-readable medium physically embodied with computer-readable program code for:

receiving an instruction from an infrastructure entity to add plural pilot signal sets from one additional coverage zone to an active set of the user entity, wherein the infrastructure entity transmits the instruction when one pilot signal set from the additional coverage zone meets a predetermined criterion, and wherein the additional coverage zone operates under multiple different frequency bands that respectively correspond to the plural pilot signal sets to generate multi-carrier coverage over one designated area.