최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0299898 (2011-11-18) |
등록번호 | US-8917654 (2014-12-23) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 3 인용 특허 : 377 |
Systems and methodologies are described that facilitate frequency hopping in a single carrier FDMA wireless environment by dynamically altering user offsets with time to obtain interference diversity. A channel tree can be utilized with nodes that are assigned values. User devices can be assigned to
Systems and methodologies are described that facilitate frequency hopping in a single carrier FDMA wireless environment by dynamically altering user offsets with time to obtain interference diversity. A channel tree can be utilized with nodes that are assigned values. User devices can be assigned to such nodes, a path between an assigned node and a root node in the channel tree can be evaluated, and a table lookup can be performed to determine an identity of a subcarrier set to assign to the user device assigned to a given node, as well as a number of subcarriers to be assigned to the user device. Additionally, node values can be dynamically varied during a communication event to alter path values and thus alter subcarrier set assignments.
1. An apparatus for wireless communication, comprising: a memory configured to store information related to a plurality of offsets available for transmission of single-carrier frequency division multiple-access (FDMA) symbols, each of the plurality of offsets being associated with a different starti
1. An apparatus for wireless communication, comprising: a memory configured to store information related to a plurality of offsets available for transmission of single-carrier frequency division multiple-access (FDMA) symbols, each of the plurality of offsets being associated with a different starting subcarrier among a plurality of subcarriers available for transmission of single-carrier FDMA symbols; anda processor coupled with the memory, the processor configured to assign an offset to a user device and to vary the offset for the user device based on a predetermined pattern. 2. The apparatus of claim 1, wherein the processor is further configured to utilize a channel tree with a plurality of nodes, to assign a node in the channel tree to the user device, and to determine the offset for the user device based on the node assigned to the user device. 3. The apparatus of claim 2, wherein the channel tree is a non-binary channel tree with each non-leaf node having one or more child nodes. 4. The apparatus of claim 3, wherein each child node in the channel tree is assigned a non-binary value. 5. The apparatus of claim 2, wherein the processor is further configured to determine a path between the node assigned to the user device and a root node in the channel tree and to determine the offset for the user device based on the path. 6. The apparatus of claim 5, wherein the processor is further configured to determine a value of the path based on values of nodes in the path and to determine the offset for the user device based on the value of the path. 7. The apparatus of claim 6, wherein the processor is further configured to perform a table lookup to identify an offset corresponding to the value of the path and to assign the identified offset to the user device. 8. The apparatus of claim 2, wherein the processor is further configured to vary the offset for the user device by periodically changing assignments of values to one or more nodes in the channel tree. 9. The apparatus of claim 1, wherein the processor is further configured to determine a number of subcarriers to assign to the user device. 10. The apparatus of claim 1, wherein the processor is further configured to determine the offset for the user device employing an interleaved FDMA (IFDMA) communication protocol. 11. The apparatus of claim 1, wherein the processor is further configured to determine the offset for the user device employing a localized FDMA (LFDMA) communication protocol. 12. The apparatus of claim 1, wherein the processor is further configured to periodically vary the offset for the user device. 13. The apparatus of claim 1, wherein the processor is further configured to employ symbol rate hopping and to vary the offset for the user device upon transmission of each single-carrier FDMA symbol by the user device. 14. The apparatus of claim 1, wherein the processor is further configured to employ block hopping and to vary the offset for the user device upon transmission of a block of single-carrier FDMA symbols by the user device. 15. A method for wireless communication, comprising: assigning an offset to a user device, the offset being one of a plurality of offsets available for transmission of single-carrier frequency division multiple-access (FDMA) symbols, each of the plurality of offsets being associated with a different starting subcarrier among a plurality of subcarriers available for transmission of single-carrier FDMA symbols; andvarying the offset for the user device based on a predetermined pattern. 16. The method of claim 15, further comprising: assigning a node in a channel tree to the user device; anddetermining the offset for the user device based on the node assigned to the user device. 17. The method of claim 16, further comprising: determining a path between the node assigned to the user device and a root node in the channel tree; anddetermining the offset for the user device based on the path. 18. The method of claim 17, further comprising: determining a value of the path based on values of nodes in the path; anddetermining the offset for the user device based on the value of the path. 19. The method of claim 15, further comprising: determining a number of subcarriers to assign to the user device. 20. The method of claim 15, wherein the varying the offset comprises varying the offset for the user device upon transmission of a block of single-carrier FDMA symbols by the user device. 21. An apparatus for wireless communication, comprising: means for assigning an offset to a user device, the offset being one of a plurality of offsets available for transmission of single-carrier frequency division multiple-access (FDMA) symbols, each of the plurality of offsets being associated with a different starting subcarrier among a plurality of subcarriers available for transmission of single-carrier FDMA symbols; andmeans for varying the offset for the user device based on a predetermined pattern. 22. The apparatus of claim 21, further comprising: means for assigning a node in a channel tree to the user device; andmeans for determining the offset for the user device based on the node assigned to the user device. 23. The apparatus of claim 22, further comprising: means for determining a path between the node assigned to the user device and a root node in the channel tree; andmeans for determining the offset for the user device based on the path. 24. The apparatus of claim 23, further comprising: means for determining a value of the path based on values of nodes in the path; andmeans for determining the offset for the user device based on the value of the path. 25. The apparatus of claim 21, further comprising: means for determining a number of subcarriers to assign to the user device. 26. The apparatus of claim 21, wherein the means for varying the offset comprises means for varying the offset for the user device upon transmission of a block of single-carrier FDMA symbols by the user device. 27. A non-transitory computer-readable medium having stored thereon computer-executable instructions for: assigning an offset to a user device, the offset being one of a plurality of offsets available for transmission of single-carrier frequency division multiple-access (FDMA) symbols, each of the plurality of offsets being associated with a different starting subcarrier among a plurality of subcarriers available for transmission of single-carrier FDMA symbols; andvarying the offset for the user device based on a predetermined pattern. 28. The apparatus of claim 1, wherein the processor is further configured to: assign a first set of subcarriers determined based on the offset to the user device, andassign a second set of subcarriers determined based on the varied offset to the user device. 29. The apparatus of claim 28, wherein the first and second sets of subcarriers are constrained to a portion of system bandwidth. 30. The apparatus of claim 28, wherein the first and second sets include an equal number of subcarriers determined based on a subcarrier set size allocated to the user device and selected from among a plurality of supported subcarrier set sizes. 31. The apparatus of claim 28, wherein the processor is further configured to: receive at least one localized frequency division multiple-access (LFDMA) symbol sent on the first set of subcarriers by the user device, andreceive at least one additional LFDMA symbol sent on the second set of subcarriers by the user device. 32. The apparatus of claim 28, wherein the processor is further configured to: receive at least one interleaved frequency division multiple-access (IFDMA) symbol sent on the first set of subcarriers by the user device, andreceive at least one additional IFDMA symbol sent on the second set of subcarriers by the user device. 33. The method of claim 15, further comprising: assigning a first set of subcarriers determined based on the offset to the user device; andassigning a second set of subcarriers determined based on the varied offset to the user device. 34. The method of claim 33, wherein the first and second sets of subcarriers are constrained to a portion of system bandwidth. 35. The method of claim 33, wherein the first and second sets include an equal number of subcarriers determined based on a subcarrier set size allocated to the user device and selected from among a plurality of supported subcarrier set sizes. 36. The method of claim 33, further comprising: receiving at least one localized frequency division multiple-access (LFDMA) symbol sent on the first set of subcarriers by the user device; andreceiving at least one additional LFDMA symbol sent on the second set of subcarriers by the user device. 37. The method of claim 33, wherein the processor is further configured to: receiving at least one interleaved frequency division multiple-access (IFDMA) symbol sent on the first set of subcarriers by the user device; andreceiving at least one additional IFDMA symbol sent on the second set of subcarriers by the user device. 38. The apparatus of claim 21, further comprising: means for assigning a first set of subcarriers determined based on the offset to the user device; andmeans for assigning a second set of subcarriers determined based on the varied offset to the user device. 39. The apparatus of claim 38, wherein the first and second sets of subcarriers are constrained to a portion of system bandwidth. 40. The apparatus of claim 38, wherein the first and second sets include an equal number of subcarriers determined based on a subcarrier set size allocated to the user device and selected from among a plurality of supported subcarrier set sizes. 41. The apparatus of claim 38, further comprising: means for receiving at least one localized frequency division multiple-access (LFDMA) symbol sent on the first set of subcarriers by the user device; andmeans for receiving at least one additional LFDMA symbol sent on the second set of subcarriers by the user device. 42. The apparatus of claim 38, further comprising: means for receiving at least one interleaved frequency division multiple-access (IFDMA) symbol sent on the first set of subcarriers by the user device; andmeans for receiving at least one additional IFDMA symbol sent on the second set of subcarriers by the user device. 43. An apparatus for wireless communication, comprising: a processor configured to: receive an assignment of an offset for a user device, the offset being varied based on a predetermined pattern and being one of a plurality of offsets available for transmission of single-carrier frequency division multiple-access (FDMA) symbols, each of the plurality of offsets being associated with a different starting subcarrier among a plurality of subcarriers available for transmission of single-carrier FDMA symbols, andsend at least one single-carrier FDMA symbol based on the assignment. 44. The apparatus of claim 43, wherein the offset for the user device is varied periodically. 45. The apparatus of claim 43, wherein the offset for the user device is varied upon transmission of each single-carrier FDMA symbol by the user device. 46. The apparatus of claim 43, wherein the offset for the user device is varied upon transmission of a block of single-carrier FDMA symbols by the user device. 47. The apparatus of claim 43, wherein the processor is further configured to: determine a first set of subcarriers assigned to the user device based on the offset for the user device, anddetermine a second set of subcarriers assigned to the user device based on a varied offset for the user device. 48. The apparatus of claim 47, wherein the first and second sets of subcarriers are constrained to a portion of system bandwidth. 49. The apparatus of claim 47, wherein the first and second sets include an equal number of subcarriers determined based on a subcarrier set size allocated to the user device and selected from among a plurality of supported subcarrier set sizes. 50. The apparatus of claim 47, wherein the processor is further configured to: send at least one localized frequency division multiple-access (LFDMA) symbol on the first set of subcarriers, andsend at least one additional LFDMA symbol on the second set of subcarriers. 51. The apparatus of claim 47, wherein the processor is further configured to: send at least one interleaved frequency division multiple-access (IFDMA) symbol on the first set of subcarriers, andsend at least one additional IFDMA symbol on the second set of subcarriers. 52. A method for wireless communication, comprising: receiving an assignment of an offset for a user device, the offset being varied based on a predetermined pattern and being one of a plurality of offsets available for transmission of single-carrier frequency division multiple-access (FDMA) symbols, each of the plurality of offsets being associated with a different starting subcarrier among a plurality of subcarriers available for transmission of single-carrier FDMA symbols, andsending at least one single-carrier FDMA symbol based on the assignment. 53. The method of claim 52, wherein the offset for the user device is varied periodically. 54. The method of claim 52, wherein the offset for the user device is varied upon transmission of each single-carrier FDMA symbol by the user device. 55. The method of claim 52, wherein the offset for the user device is varied upon transmission of a block of single-carrier FDMA symbols by the user device. 56. The method of claim 52, further comprising: determining a first set of subcarriers assigned to the user device based on the offset for the user device, anddetermining a second set of subcarriers assigned to the user device based on a varied offset for the user device. 57. The method of claim 56, wherein the first and second sets of subcarriers are constrained to a portion of system bandwidth. 58. The method of claim 56, wherein the first and second sets include an equal number of subcarriers determined based on a subcarrier set size allocated to the user device and selected from among a plurality of supported subcarrier set sizes. 59. The method of claim 56, wherein the sending at least one single-carrier FDMA symbol comprises sending at least one localized frequency division multiple-access (LFDMA) symbol on the first set of subcarriers, andsending at least one additional LFDMA symbol on the second set of subcarriers. 60. The method of claim 56, wherein the sending at least one single-carrier FDMA symbol comprises sending at least one interleaved frequency division multiple-access (IFDMA) symbol on the first set of subcarriers, andsending at least one additional IFDMA symbol on the second set of subcarriers. 61. An apparatus for wireless communication, comprising: means for receiving an assignment of an offset for a user device, the offset being varied based on a predetermined pattern and being one of a plurality of offsets available for transmission of single-carrier frequency division multiple-access (FDMA) symbols, each of the plurality of offsets being associated with a different starting subcarrier among a plurality of subcarriers available for transmission of single-carrier FDMA symbols, andmeans for sending at least one single-carrier FDMA symbol based on the assignment. 62. The apparatus of claim 61, wherein the offset for the user device is varied periodically. 63. The apparatus of claim 61, wherein the offset for the user device is varied upon transmission of each single-carrier FDMA symbol by the user device. 64. The apparatus of claim 61, wherein the offset for the user device is varied upon transmission of a block of single-carrier FDMA symbols by the user device. 65. The apparatus of claim 61, further comprising: means for determining a first set of subcarriers assigned to the user device based on the offset for the user device, andmeans for determining a second set of subcarriers assigned to the user device based on a varied offset for the user device. 66. The apparatus of claim 65, wherein the first and second sets of subcarriers are constrained to a portion of system bandwidth. 67. The apparatus of claim 65, wherein the first and second sets include an equal number of subcarriers determined based on a subcarrier set size allocated to the user device and selected from among a plurality of supported subcarrier set sizes. 68. The apparatus of claim 65, wherein the means for sending at least one single-carrier FDMA symbol comprises means for sending at least one localized frequency division multiple-access (LFDMA) symbol on the first set of subcarriers, andmeans for sending at least one additional LFDMA symbol on the second set of subcarriers. 69. The apparatus of claim 65, wherein the means for sending at least one single-carrier FDMA symbol comprises means for sending at least one interleaved frequency division multiple-access (IFDMA) symbol on the first set of subcarriers, andmeans for sending at least one additional IFDMA symbol on the second set of subcarriers. 70. A non-transitory computer-readable medium having stored thereon computer-executable instructions for: receiving an assignment of an offset for a user device, the offset being varied based on a predetermined pattern and being one of a plurality of offsets available for transmission of single-carrier frequency division multiple-access (FDMA) symbols, each of the plurality of offsets being associated with a different starting subcarrier among a plurality of subcarriers available for transmission of single-carrier FDMA symbols, andsending at least one single-carrier FDMA symbol based on the assignment.
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