Wireless resource allocation methods and apparatus

• US 8,582,592 B2
• Filed: 06/21/2007
• Issued: 11/12/2013
• Est. Priority Date: 06/21/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei, Palanki, Ravi
• Primary Examiner(s): Georgewill, Opiribo
• Application Number:
  US11/766,325
• Publication Number:
  US 20080056183A1
• Time in Patent Office: 2,336 Days
• Field of Search: 370/329, 370/236, 370/342, 370/335, 370/341, 370/431, 455/91, 455/450
• US Class Current: 370/431
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 17/382 for resource allocation, admission control or handover
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Methods and apparatus for assigning and using resources corresponding to discontinuous portions of bandwidth are described. A single assignment may be used to assign multiple disjoint portions of bandwidth to be used by a wireless terminal, e.g., at the same time, as an uplink or downlink band. Different portions of bandwidth allocated to a terminal may have different numbers and/or locations of guard subcarriers with relevant guard subcarrier information being communicated to the wireless terminal in a broadcast signal or being determined from stored information. The disjoint portions of bandwidth allocated for use to a terminal may be separated by a carrier band, e.g., 1.25 MHz or more, which is not available for use, e.g., because it is owned by another service provider. Some embodiments are implemented using OFDM signals wherein a wireless terminal may generate or receive an OFDM symbol including subcarriers, e.g., tones corresponding to the different discontinuous portions but not the bandwidth separating the discontinuous portions.

Claims

1. A method for assigning resources in a wireless communication system comprising:

operating a control node to perform the steps of;

transmitting, on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node;

selecting a first wireless terminal to be assigned a communications resource;

assigning the first wireless terminal a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said at least two discontinuous portions of bandwidth being discontinuous portions of bandwidth from said plurality of discontinuous portions of bandwidth, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said control node; and

transmitting a single assignment message communicating the assignment of the resource including the at least two discontinuous portions of bandwidth to the first wireless terminal, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource.

2. The method of claim 1,

wherein different numbers of guard subcarriers are included in said first and second portions of bandwidth.

3. The method of claim 1,

wherein transmitting guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier includes transmitting an allocation map identifying the number and location of guard subcarriers within portions of said bandwidth corresponding to the first carrier.

4. The method of claim 3, wherein at least some of said discontinuous portions of bandwidth have guard subcarriers located at different locations.

5. The method of claim 3, wherein said guard subcarrier information is broadcast in a preamble.

6. The method of claim 1,

wherein said single assignment message assigns said at least two discontinuous portions of bandwidth to be used at the same time as an uplink band or a downlink band.

7. The method of claim 6, further comprising:

assigning a second terminal a resource corresponding to one of said discontinuous portions of bandwidth during a second period of time, said one of said discontinuous portions of bandwidth being shared by said first and second wireless terminals on one of a time division multiplexing basis and frequency division multiplexing basis.

8. The method of claim 6, wherein said discontinuous portions of bandwidth are separated by at least 1.25 MHz.

9. The method of claim 6, wherein assigning comprises assigning the first terminal to resources based upon a channel tree which indicates sub-carriers corresponding to a communications channel constructed from a plurality of discontinuous portions of bandwidth.

10. The method of claim 6, wherein said resource is an uplink resource.

11. The method of claim 6, wherein said resource is a downlink resource.

12. The method of claim 1, further comprising:

transmitting an OFDM signal including information directed to said wireless terminal including tones corresponding to said discontinuous portions but not said portion of bandwidth not included in said resource.

69. The method of claim 1,

wherein each of said at least two discontinuous portions of bandwidth is less than or equal to a first size;

and

wherein each of said at least two discontinuous portions of bandwidth are separated by a portion of bandwidth which is spaced apart by an amount of bandwidth which is a multiple of said first size.

70. The method of claim 69, wherein said third portion of bandwidth is said first size.

71. The method of claim 69, further comprising:

transmitting information indicating the total bandwidth over which said at least two discontinuous portions may be scattered.

72. The method of claim 71, wherein said total bandwidth is 2, 4, 8 or 16 times the first size.

73. The method of claim 71, wherein the total bandwidth is less than or equal to 20 MHz.

74. The method of claim 1, wherein said control node is one of a base station or access point, the method further comprising:

transmitting information indicating the total bandwidth over which said at least two discontinuous portions may be scattered.

13. A communications apparatus for assigning resources in a wireless communication system, the apparatus comprising:

a wireless transmitter configured to transmit, on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node;

a selection module for selecting a first wireless terminal to be assigned a communications resource;

a resource assignment module for assigning the first wireless terminal selected by said selection module a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said at least two discontinuous portions of bandwidth being discontinuous portions of bandwidth from said plurality of discontinuous portions of bandwidth, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said communications apparatus;

wherein said wireless transmitter is further configured to transmit a single assignment message communicating the assignment of the resource including the at least two discontinuous portions of bandwidth to the first wireless terminal, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource; and

memory for storing information.

14. The apparatus of claim 13, further comprising:

an assignment message generation module for generating said single assignment message; and

wherein said wireless transmitter is further configured to transmit, as part of transmitting guard subcarrier information indicating both the number and location of guard subcarriers, an allocation map identifying the number and location of guard subcarriers within portions of said bandwidth corresponding to the first carrier.

15. The apparatus of claim 14,

wherein said memory includes stored airlink resource information indicating communications bands available for assignment.

16. The apparatus of claim 15,

wherein said memory includes stored airlink resource information identifying different discontinuous portions of bandwidth available for allocation corresponding to a resource.

17. The apparatus of claim 16 wherein said discontinuous portions of bandwidth are separated by at least 1.25 MHz.

18. The apparatus of claim 16,

wherein said memory further includes channel tree resource information indicating sub-carriers corresponding to a communications channel constructed from a plurality of discontinuous portions of bandwidth.

19. The apparatus of claim 14, wherein said resource is an uplink resource.

20. The apparatus of claim 14, wherein said resource is a downlink resource.

21. The apparatus of claim 13, further comprising:

a symbol generation module for generating an OFDM symbol including tones corresponding to said discontinuous portions but not said portion of bandwidth not included in said resource; and

a wireless OFDM transmitter module for transmitting an OFDM signal including information directed to said wireless terminal including tones corresponding to said discontinuous portions but not said portion of bandwidth not included in said resource.

22. A communications apparatus for assigning resources in a wireless communication system, the apparatus comprising:

means for transmitting, on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node;

selection means for selecting a first wireless terminal to be assigned a communications resource;

means for assigning the first wireless terminal selected by said selection means a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said at least two discontinuous portions of bandwidth being discontinuous portions of bandwidth from said plurality of discontinuous portions of bandwidth, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said communications apparatus;

wherein said means for transmitting are also for transmitting a single assignment message communicating the assignment of the resource including the at least two discontinuous portions of bandwidth to the first wireless terminal, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource; and

memory means for storing information.

23. The apparatus of claim 22, further comprising:

means for generating said single assignment message.

24. The apparatus of claim 23,

wherein said memory means for storing include stored airlink resource information indicating communications bands available for assignment.

25. The apparatus of claim 22, further comprising:

means for generating an OFDM symbol including tones corresponding to said discontinuous portions but not said portion of bandwidth not included in said resource; and

means for transmitting an OFDM signal including information directed to said wireless terminal including tones corresponding to said discontinuous portions but not said portion of bandwidth not included in said resource.

26. An apparatus comprising:

a processor configured to control said apparatus to;

transmit, on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node;

select a first wireless terminal to be assigned a communications resource;

assign the first wireless terminal a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said at least two discontinuous portions of bandwidth being discontinuous portions of bandwidth from said plurality of discontinuous portions of bandwidth, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said apparatus; and

transmit a single assignment message communicating the assignment of the resource including the at least two discontinuous portions of bandwidth to the first wireless terminal, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource; and

memory coupled to said processor.

27. The apparatus of claim 26, wherein different numbers of guard subcarriers are included in said first and second portions of bandwidth.

28. The apparatus of claim 26, wherein said processor is further configured to control said apparatus to:

transmit an allocation map identifying the number and location of guard subcarriers within portions of said bandwidth corresponding to the first carrier, as part of being configured to control said apparatus to transmit guard subcarrier information indicating both the number and location of guard subcarriers in said-plurality of discontinuous portions of bandwidth corresponding to the first carrier.

29. The apparatus of claim 26, wherein said single assignment message assigns said at least two discontinuous portions of bandwidth to be used at the same time as an uplink band or a downlink band.

30. The apparatus of claim 26, wherein said processor is further configured to control said apparatus to:

transmit an OFDM signal including information directed to said wireless terminal including tones corresponding to said discontinuous portions but not said portion of bandwidth not included in said resource.

31. A non-transitory computer readable medium embodying machine executable instructions for controlling a communications device to implement a method of assigning resources in a wireless communication system, the method comprising:

transmitting, on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node;

selecting a first wireless terminal to be assigned a communications resource; and

assigning the first wireless terminal a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said at least two discontinuous portions of bandwidth being discontinuous portions of bandwidth from said plurality of discontinuous portions of bandwidth, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said communications device; and

transmitting a single assignment message communicating the assignment of the resource including the at least two discontinuous portions of bandwidth to the first wireless terminal, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource.

32. The non-transitory computer readable medium of claim 31, wherein different numbers of guard subcarriers are included in said first and second portions of bandwidth.

33. The non-transitory computer readable medium of claim 31,

wherein transmitting guard subcarrier information indicating both the number and location of guard subcarriers in said plurality of discontinuous portions of bandwidth includes transmitting an allocation map identifying the number and location of guard subcarriers within portions of said bandwidth corresponding to the first carrier.

34. The non-transitory computer readable medium of claim 31, wherein said single assignment message assigns said at least two discontinuous portions of bandwidth to be used at the same time as an uplink band or a downlink band.

35. The non-transitory computer readable medium of claim 31, further embodying machine executable instructions for:

transmitting an OFDM signal including information directed to said wireless terminal including tones corresponding to said discontinuous portions but not said portion of bandwidth not included in said resource.

36. A method of operating a wireless terminal comprising:

receiving from a control node, on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node;

receiving from the control node a resource assignment message indicating assignment, to said wireless terminal of a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said at least two discontinuous portions of bandwidth being discontinuous portions of bandwidth from said plurality of discontinuous portions of bandwidth, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said control node; and

using said assigned resource to communicate with said control node.

37. The method of claim 36, wherein different numbers of guard subcarriers are included in said first and second portions of bandwidth.

38. The method of claim 36,

wherein receiving guard subcarrier information includes receiving an allocation map identifying the number and location of guard subcarriers within portions of said bandwidth corresponding to the first carrier.

39. The method of claim 38, further comprising:

storing at least some of said received guard subcarrier information, said stored guard subcarrier information indicating different guard subcarrier locations within different discontinuous portions of bandwidth.

40. The method of claim 38, wherein receiving guard subcarrier information includes receiving a broadcast superframe preamble including said guard subcarrier information.

41. The method of claim 36, wherein said discontinuous portions of bandwidth are separated by at least 1.25 MHz.

42. The method of claim 41, further comprising:

determining from the node identifier and stored information a set of sub-carriers corresponding to said node identifier to be used by said wireless terminal.

43. The method of claim 41, wherein said resource is an uplink resource.

44. The method of claim 43, further comprising:

generating an OFDM symbol including information directed to said control node, said OFDM symbol including tones corresponding to said discontinuous portions but not said portion of bandwidth not included in said resource; and

wherein using said assigned resource includes transmitting said generated OFDM symbol.

45. The method of claim 41, wherein said resource is a downlink resource.

46. A wireless terminal comprising:

a receiver module configured to receive, from a control node, on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node, and receive a resource assignment message indicating assignment, to said wireless terminal, of a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said at least two discontinuous portions of bandwidth being discontinuous portions of bandwidth from said plurality of discontinuous portions of bandwidth, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said control node; and

at least one of;

i) a symbol generation module for generating symbols corresponding to the allocated resource and

ii) a symbol recovery module for recovering symbols corresponding to the allocated resource.

47. The wireless terminal of claim 46, wherein different numbers of guard subcarriers are included in said first and second portions of bandwidth.

48. The wireless terminal of claim 46, further comprising:

a guard subcarrier information recovery module for recovering received guard subcarrier information indicating both the number and location of guard subcarriers in said plaurality of discontinuous portions of bandwidth corresponding to the first carrier.

49. The wireless terminal of claim 48, further comprising:

a memory module for storing at least some of said received guard subcarrier information, said stored guard subcarrier information indicating different guard subcarrier locations within different discontinuous portions of bandwidth.

50. The wireless terminal of claim 46, wherein said discontinuous portions of bandwidth are separated by at least 1.25 MHz.

51. The wireless terminal of claim 50, wherein said resource is an uplink resource.

52. The wireless terminal of claim 51, further comprising:

wherein said symbol generation module is an OFDM symbol generation module which generates an OFDM symbol including information directed to said control node, said OFDM symbol including tones corresponding to said discontinuous portions but not said portion of bandwidth not included in said resource; and

a transmitter module for transmitting OFDM symbols generated by said OFDM symbol generation module.

53. The wireless terminal of claim 50, wherein said resource is a downlink resource.

54. A wireless terminal comprising:

receiver means for receiving, from a control node on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node, and for receiving a resource assignment message indicating assignment, to said wireless terminal, of a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said at least two discontinuous portions of bandwidth being discontinuous portions of bandwidth from said plurality of discontinuous portions of bandwidth, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said control node; and

at least one of;

i) means for generating symbols corresponding to the allocated resource and

ii) means for recovering symbols corresponding to the allocated resource.

55. The wireless terminal of claim 54, wherein different numbers of guard subcarriers are included in said first and second portions of bandwidth.

56. The wireless terminal of claim 54, further comprising:

guard subcarrier information recovery means for recovering received guard subcarrier information indicating both the number and location of guard subcarriers in said plurality of discontinuous portions of bandwidth corresponding to the first carrier.

57. The wireless terminal of claim 56, further comprising:

memory means for storing at least some of said received guard subcarrier information, said stored guard subcarrier information indicating different guard subcarrier locations within different discontinuous portions of bandwidth.

58. The wireless terminal of claim 54, wherein said discontinuous portions of bandwidth are separated by at least 1.25 MHz.

59. An apparatus comprising:

a processor for use in a wireless terminal, the processor configured to;

receive, from a control node on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node;

receive from said control node a resource assignment message indicating assignment, to said wireless terminal, of a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said at least two discontinuous portions of bandwidth being discontinuous portions of bandwidth from said plurality of discontinuous portions of bandwidth, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said control node; and

use said assigned resource to communicate with said control node.

60. The apparatus of claim 59, wherein different numbers of guard subcarriers are included in said first and second portions of bandwidth.

61. The apparatus of claim 59, wherein said processor is further configured to:

receive, as part of receiving said guard subcarrier information indicating both the number and location of guard subcarriers in said plurality of discontinuous portions of bandwidth, an allocation map identifying the number and location of guard subcarriers within portions of said bandwidth corresponding to the first carrier.

62. The apparatus of claim 59, wherein said discontinuous portions of bandwidth are separated by at least 1.25 MHz.

63. The apparatus of claim 62, wherein said processor is further configured to:

determine from the node identifier and stored information a set of sub-carriers corresponding to said node identifier to be used by said wireless terminal.

64. A non-transitory computer readable medium embodying machine executable instructions for controlling a wireless terminal to implement a method of communicating with another communications device, the method comprising:

receiving from a control node, on a control channel formed from a group of contiguous subcarriers in bandwidth including at least some discontinuous subcarriers, guard subcarrier information, said guard subcarrier information indicating both the number and location of guard subcarriers in a plurality of discontinuous portions of bandwidth corresponding to a first carrier that may be assigned by said control node;

receiving, from said control node, a resource assignment message indicating assignment, to said wireless terminal, of a resource including at least two discontinuous portions of bandwidth corresponding to the first carrier for a period of time, said assignment message including a node identifier corresponding to a set of subcarriers including at least one guard subcarrier from each of the at least two discontinuous portions of bandwidth corresponding to the resource, said at least two discontinuous portions of bandwidth including a first portion of bandwidth and a second portion of bandwidth, said first and second portions of bandwidth being separated by a third portion of bandwidth corresponding to another carrier not included in said resource, said third portion of bandwidth being larger than either of said two discontinuous portions of bandwidth and being a portion of bandwidth which is not used by said control node; and

using said assigned resource to communicate with said control node.

65. The non-transitory computer readable medium of claim 64, wherein different numbers of guard subcarriers are included in said first and second portions of bandwidth.

66. The non-transitory computer readable medium of claim 64,

wherein receiving guard subcarrier information indicating both the number and location of guard subcarriers in said plurality of discontinuous portions of bandwidth corresponding to the first carrier includes receiving an allocation map identifying the number and location of guard subcarriers within portions of said bandwidth corresponding to the first carrier.

67. The non-transitory computer readable medium of claim 64, wherein said discontinuous portions of bandwidth are separated by at least 1.25 MHz.

68. The non-transitory computer readable medium of claim 67, further embodying machine executable instructions for:

determining from the node identifier and stored information a set of sub-carriers corresponding to said node identifier to be used by said wireless terminal.