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-0372954 (2009-02-18) |
등록번호 | US-9240877 (2016-01-19) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 1 인용 특허 : 372 |
Systems and methods of scheduling sub-carriers in an OFDMA system in which a scheduler takes into account channel conditions experienced by the communication devices to optimize channel conditions. The scheduler can partition a set of sub-carriers spanning an operating bandwidth into a plurality of
Systems and methods of scheduling sub-carriers in an OFDMA system in which a scheduler takes into account channel conditions experienced by the communication devices to optimize channel conditions. The scheduler can partition a set of sub-carriers spanning an operating bandwidth into a plurality of segments. The segments can include a plurality of global segments that each includes a distinct non-contiguous subset of the sub-carriers spanning substantially the entire operating bandwidth. One or more of the global segments can be further partitioned into a plurality of local segments that each has a bandwidth that is less than a channel coherence bandwidth. The scheduler determines channel characteristics experienced by each communication device via reporting or channel estimation, and allocates one or more segments to communication links for each device according to the channel characteristics.
1. An apparatus for channel sensitive scheduling in a communication system including a plurality of sub-carriers spanning an operating frequency band, the apparatus comprising: a channel estimator executably configured to determine a channel estimate corresponding to each of a plurality of segments
1. An apparatus for channel sensitive scheduling in a communication system including a plurality of sub-carriers spanning an operating frequency band, the apparatus comprising: a channel estimator executably configured to determine a channel estimate corresponding to each of a plurality of segments spanning the operating frequency band based on pilot signals, each of the plurality of segments having a bandwidth less than a total bandwidth;a signal mapper executably configured to map data symbols to a subset of the plurality of sub-carriers in the communication system;a scheduler coupled to the channel estimator and executably configured to determine a first preferred segment based on the channel estimates and user data constraints of data to be transmitted, determine a number of sub-carriers assigned to the subset of the plurality of subcarriers based on one or more signal conditions, select the subset of the plurality of sub-carriers from within the first preferred segment, and further executably configured to control the signal mapper to map the data symbols to the subset of the plurality of sub-carriers; anda Channel Quality Indicator (CQI) receiver coupled to a receiver module and executably configured to process channel characteristic reporting messages received by the receiver module to determine a second preferred segment and further configured to generate a resource assignment message based on the channel characteristic reporting messages. 2. The apparatus of claim 1, wherein the receiver module is executably configured to receive reverse link pilot signals and wherein the scheduler is executably configured to select the subset of the plurality of sub-carriers for a forward link transmission based on the reverse link pilot signals. 3. The apparatus of claim 1, wherein the pilot signals comprise reverse link pilot signals and the scheduler is executably configured to generate a reverse link resource assignment message for transmission to a user terminal based on the channel estimates. 4. The apparatus of claim 1, wherein the scheduler is executably configured to select the first preferred segment as a segment having a largest signal to noise ratio determined from the pilot signals. 5. The apparatus of claim 1, further comprising a frequency hopper module executably configured to enforce a frequency hopping scheme within the first preferred segment. 6. A method for channel sensitive scheduling in a communication system including a plurality of sub-carriers spanning an operating frequency band, the method comprising: determining a channel estimate corresponding to each of a plurality of segments spanning the operating frequency band based on pilot signals, each of the plurality of segments having a bandwidth less than a total bandwidth;mapping data symbols to a subset of the plurality of sub-carriers in the communication system;determining a first preferred segment based on the channel estimates and user data constraints of data to be transmitted;determining a number of sub-carriers assigned to the subset of the plurality of subcarriers based on one or more signal conditions;selecting the subset of the plurality of sub-carriers from within the first preferred segment; mapping the data symbols to the subset of the plurality of sub-carriers;andprocessing channel characteristic reporting messages received by a Channel Quality Indicator (CQI) receiver coupled to a receiver module to determine a second preferred segment and further comprising generating a resource assignment message based on the channel characteristic reporting messages. 7. The method of claim 6, further comprising receiving reverse link pilot signals and selecting the subset of the plurality of sub-carriers for a forward link transmission based on the reverse link pilot signals. 8. The method of claim 6, wherein the pilot signals comprise reverse link pilot signals and generating a reverse link resource assignment message for transmission to a user terminal based on the channel estimates. 9. The method of claim 6, further comprising selecting the first preferred segment as a segment having a largest signal to noise ratio determined from the pilot signals. 10. The method of claim 6, further comprising enforcing a frequency hopping scheme within the first preferred segment. 11. A non-transitory computer-readable tangible medium including computer-executable instructions for executing a method for channel sensitive scheduling in a communication system including a plurality of sub-carriers spanning an operating frequency band, the method comprising: determining a channel estimate corresponding to each of a plurality of segments spanning the operating frequency band based on pilot signals, each of the plurality of segments having a bandwidth less than a total bandwidth;mapping data symbols to a subset of the plurality of sub-carriers in the communication system;determining a first preferred segment based on the channel estimates and user data constraints of data to be transmitted;determining a number of sub-carriers assigned to the subset of the plurality of sub-carriers based on one or more signal conditions;selecting the subset of the plurality of sub-carriers from within the first preferred segment;mapping the data symbols to the subset of the plurality of sub-carriers; andprocessing channel characteristic reporting messages received by a Channel Quality Indicator (CQI) receiver coupled to a receiver module to determine a second preferred segment and further comprising generating a resource assignment message based on the channel characteristic reporting messages. 12. The non-transitory computer-readable tangible medium of claim 11, the method further comprising receiving reverse link pilot signals and selecting the subset of the plurality of sub-carriers for a forward link transmission based on the reverse link pilot signals. 13. The non-transitory computer-readable tangible medium of claim 11, wherein the pilot signals comprise reverse link pilot signals and the method further comprising generating a reverse link resource assignment message for transmission to a user terminal based on the channel estimates. 14. The non-transitory computer-readable tangible medium of claim 11, the method further comprising selecting the first preferred segment as a segment having a largest signal to noise ratio determined from the pilot signals. 15. The non-transitory computer-readable tangible medium of claim 11, the method further comprising enforcing a frequency hopping scheme within the first preferred segment. 16. An apparatus for channel sensitive scheduling in a communication system including a plurality of sub-carriers spanning an operating frequency band, the apparatus comprising: means for determining a channel estimate corresponding to each of a plurality of segments spanning the operating frequency band based on pilot signals, each of the plurality of segments having a bandwidth less than a total bandwidth;means for mapping data symbols to a subset of the plurality of sub-carriers in the communication system;means for determining a first preferred segment based on the channel estimates and user data constraints of data to be transmitted;means for determining a number of sub-carriers assigned to the subset of the plurality of sub-carriers based on one or more signal conditions;means for selecting the subset of the plurality of sub-carriers from within the first preferred segment;means for mapping the data symbols to the subset of the plurality of sub-carriers; andmeans for processing channel characteristic reporting messages received by a Channel Quality Indicator (CQI) receiver coupled to a receiver module to determine a second preferred segment and further comprising means for generating a resource assignment message based on the channel characteristic reporting messages. 17. The apparatus of claim 16, further comprising means for receiving reverse link pilot signals and means for selecting the subset of the plurality of sub-carriers for a forward link transmission based on the reverse link pilot signals. 18. The apparatus of claim 16, wherein the pilot signals comprise reverse link pilot signals and the apparatus further comprises a means for generating a reverse link resource assignment message for transmission to a user terminal based on the channel estimates.
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