IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
UP-0540311
(2006-09-29)
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등록번호 |
US-7848283
(2011-01-31)
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발명자
/ 주소 |
- Padovani, Roberto
- Bender, Paul E.
- Black, Peter J.
- Grob, Matthew S.
- Hinderling, Jurg K.
- Sindhushayana, Nagabhushana T.
- Wheatley, III, Charles E.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
8 인용 특허 :
270 |
초록
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In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate su
In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.
대표청구항
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What is claimed is: 1. An apparatus for a wireless communication system, comprising: means for measuring channel quality of a link in the communication system; means for periodically transmitting a quality indicator determined based on the channel quality of the link; and means for receiving data i
What is claimed is: 1. An apparatus for a wireless communication system, comprising: means for measuring channel quality of a link in the communication system; means for periodically transmitting a quality indicator determined based on the channel quality of the link; and means for receiving data in accordance with a data rate determined based on the periodically transmitted quality indicator, wherein the data rate is used for an initial transmission of the data. 2. The apparatus as in claim 1, wherein the means for measuring channel quality of the link comprises: means for periodically measuring a Carrier-to-Interference (C/I) of the link. 3. The apparatus as in claim 2, wherein the means for periodically measuring C/I comprises: means for measuring Carrier-to-Interference (C/I) of the link at every time slot. 4. The apparatus as in claim 1, wherein the means for measuring channel quality of the link comprises: means for continuously measuring Carrier-to-Interference (C/I) of the link. 5. The apparatus as in claim 1, wherein the means for measuring channel quality of the link comprises: means for measuring channel quality for each link associated with a member of an Active Set of at least one transmitter. 6. The apparatus as in claim 1, wherein the means for measuring channel quality of the link comprises: means for measuring channel quality for a subset of links associated with members of an Active Set of at least one transmitter. 7. The apparatus as in claim 1, wherein the means for measuring channel quality of the link comprises: means for measuring channel quality of the link when a packet is absent. 8. The apparatus as in claim 1, wherein the data rate corresponds to the quality indicator. 9. The apparatus as in any of claims 1 to 8, wherein the apparatus is a non-transitory computer-readable medium encoded with a computer program to increase data throughput and efficiency when coupled to a computing device. 10. The apparatus as in claim 1, wherein the quality indicator comprises a Carrier-to-Interference (C/I) index. 11. The apparatus as in claim 1, wherein the quality indicator comprises a requested data rate. 12. The apparatus as in claim 11, wherein the means for receiving data comprises: means for receiving data at the data rate equal to or less than the requested data rate. 13. The apparatus as in claim 1, wherein the means for periodically transmitting the quality indicator comprises: means for periodically transmitting the quality indicator to a selected transmitter among multiple transmitters. 14. The apparatus as in claim 13, wherein the means for receiving data comprises: means for receiving data from the selected transmitter. 15. The apparatus as in claim 1, wherein the means for receiving data comprises: means for receiving data via an amount of resources determined as a function of the quality indicator. 16. The apparatus as in claim 15, wherein the amount of resources comprises a particular number of Walsh covers. 17. The apparatus as in claim 1, wherein the means for receiving data comprises: means for receiving data transmitted at a predetermined power level independent of the quality indicator. 18. An apparatus for a wireless communication system, comprising: means for measuring channel quality of a link in the communication system; means for receiving a plurality of future transmission activity messages, each message corresponding to at least one transmitter; means for determining a quality indicator based on the measured channel quality and the received messages; means for transmitting the quality indicator, wherein the quality indicator maps to a data rate; and means for receiving data as a function of the quality indicator. 19. The apparatus as in claim 18, wherein each future transmission activity message indicates whether transmission will occur at a next half frame. 20. The apparatus as in claim 18, wherein the future transmission activity messages broadcast interference information. 21. The apparatus as in claim 18, wherein the means for determining the quality indicator comprises means for computing a Carrier-to-Interference ratio (C/I) for the link. 22. The apparatus as in claim 21, wherein the C/I is computed in accordance with: ( C I ) i = C i I - ∑ j ≠ i ( 1 - α j ) C j , wherein (C/I)i is a C/I measurement of an ith forward link signal, Ci is a total received power of the ith forward link signal, is a received power of a jth forward link signal, I is total interference, and αj is a bit corresponding to the future transmission activity message for the jth forward link signal. 23. The apparatus as in claim 18, wherein each future transmission activity message comprises a bit having a first logic value to indicate a scheduled transmission or a second logic value to indicate no scheduled transmission. 24. The apparatus as in claim 23, wherein the bit is transmitted during a first time period, and indicates a transmission activity occurring during a second time period subsequent to the first time period. 25. The apparatus as in claim 18, wherein the transmission activity messages are transmitted during successive time slots. 26. A method implemented in an apparatus in a wireless communication system, comprising: measuring channel quality of a link in the communication system; periodically transmitting a quality indicator determined based on the channel quality of the link; and receiving data in accordance with a data rate determined based on the periodically transmitted quality indicator, wherein the data rate is used for an initial transmission of the data. 27. The method as in claim 26, wherein the measuring channel quality of the link comprises: periodically measuring a Carrier-to-Interference (C/I) of the link. 28. The method as in claim 27, wherein the periodically measuring C/I comprises: measuring Carrier-to-Interference (C/I) of the link at every time slot. 29. The method as in claim 26, wherein the measuring channel quality comprises: continuously measuring Carrier-to-Interference (C/I) of the link. 30. The method as in claim 26, wherein the measuring channel quality of the link comprises: measuring channel quality for each link associated with a member of an Active Set of at least one transmitter. 31. The method as in claim 26, wherein the measuring the channel quality of the link comprises: measuring channel quality for a subset of links associated with members of an Active Set of at least one transmitter. 32. The method as in claim 26, wherein the measuring channel quality comprises: measuring channel quality of the link when a packet is absent. 33. The method as in claim 26, wherein the data rate corresponds to the quality indicator. 34. The method as in claim 26, wherein the periodically transmitting the quality indicator comprises: transmitting the quality indicator with a period of less than 2 ms. 35. The method as in claim 26, wherein the transmitting the quality indicator comprises: transmitting the quality indicator by use of an absolute reference and a relative reference. 36. The method as in claim 26, wherein the quality indicator comprises a Carrier-to-Interference (C/I) index. 37. The method as in claim 26, wherein the quality indicator comprises a requested data rate. 38. A method implemented in an apparatus in a wireless communication system, comprising: measuring channel quality of a link in the communication system; receiving a plurality of future transmission activity messages, each message corresponding to at least one transmitter; determining a quality indicator based on the measured channel quality and the received messages, wherein the quality indicator maps to a data rate; transmitting the quality indicator; and receiving data in accordance with the mapped data rate. 39. The method as in claim 38, wherein the future transmission activity messages broadcast interference information. 40. The method as in claim 38, wherein the determining the quality indicator comprises computing a Carrier-to-Interference ratio (C/I) for the link. 41. The method as in claim 40, wherein the C/I is computed in accordance with: ( C I ) i = C i I - ∑ j ≠ i ( 1 - α j ) C j , wherein (C/I)i is a C/I measurement of an ith forward link signal, Ci is a total received power of the ith forward link signal, Cj is a received power of a jth forward link signal, I is total interference, and αj is a bit corresponding to the future transmission activity message for the jth forward link signal. 42. The method as in any of claims 38 to 41, wherein each future transmission activity message comprises a bit having a first logic value to indicate a scheduled transmission or a second logic value to indicate no scheduled transmission. 43. The method as in claim 42, wherein the bit is transmitted during a first time period, and indicates a transmission activity occurring during a second time period subsequent to the first time period. 44. The method as in claim 38, wherein the future transmission activity messages are transmitted during successive time slots. 45. An apparatus for a wireless communication system, comprising: means for periodically receiving a quality indicator; and means for transmitting data in accordance with a data rate determined based on the periodically received quality indicator, wherein the data rate is used for an initial transmission of the data. 46. The apparatus as in claim 45, wherein the quality indicator is a function of Carrier-to-Interference (C/I) of a link. 47. The apparatus as in claim 45, wherein the means for periodically receiving the quality indicator comprises: means for receiving the quality indicator with a period of less than 2 ms. 48. The apparatus as in claim 45, further comprising: means for transmitting future transmission activity messages. 49. The apparatus as in claim 48, wherein each future transmission activity message indicates whether transmission will occur at a next half frame. 50. The apparatus as in claim 38, wherein the transmission activity messages broadcast interference information to receivers. 51. The apparatus as in claim 45, wherein the means for transmitting data comprises: means for transmitting data as a function of the quality indicator based on knowledge of the presence or absence of data transmissions. 52. The apparatus as in claim 45, further comprising: means for scheduling by transmitting data as a function of the quality indicator based on knowledge of the presence or absence of data transmissions. 53. The apparatus as in any of claims 45 to 50, 51 and 52, wherein the apparatus is a non-transitory computer-readable medium encoded with a computer program to increase data throughput and efficiency when coupled to a computing device. 54. The apparatus as in claim 45, wherein the quality indicator comprises a Carrier-to-Interference (C/I) index. 55. The apparatus as in claim 45, wherein the quality indicator comprises a requested data rate. 56. A method implemented in an apparatus in a wireless communication system, comprising: periodically receiving a quality indicator; and transmitting data in accordance with a data rate determined based on the periodically received quality indicator, wherein the data rate is used for an initial transmission of the data. 57. The method as in claim 56, wherein the quality indicator is a function of Carrier-to-Interference (C/I) of a link. 58. The method as in claim 56, wherein the periodically receiving the quality indicator comprises: receiving the quality indicator with a period of less than 2 ms. 59. The method as in claim 56, further comprising: transmitting future transmission activity messages. 60. The method as in claim 59, wherein each future transmission activity message indicates whether transmission will occur at a next half frame. 61. The method as in claim 59, wherein the future transmission activity messages broadcast interference information to the receivers. 62. The method as in any of claims 59 to 61, wherein each future transmission activity message comprises a bit having a first logic value to indicate a scheduled transmission or a second logic value to indicate no scheduled transmission. 63. The method as in claim 62, further comprising: transmitting the bit during a first time period to indicate a transmission activity occurring during a second time period subsequent to the first time period. 64. The method as in claim 59, further comprising transmitting the future transmission activity messages during successive time slots. 65. The method as in claim 56, wherein the transmitting data comprises: transmitting data as a function of the quality indicator based on knowledge of the presence or absence of data transmissions. 66. The method as in claim 56, wherein the quality indicator comprises a Carrier-to-Interference (C/I) index. 67. The method as in claim 56, wherein the quality indicator comprises a requested data rate. 68. An apparatus for a wireless communication system, comprising: means for periodically receiving a quality indicator, wherein the quality indicator maps to a data rate; means for transmitting data as a function of the quality indicator; and means for transmitting future transmission activity messages, wherein each future transmission activity message comprises a bit having a first logic value to indicate a scheduled transmission or a second logic value to indicate no scheduled transmission. 69. The apparatus as in claim 68, further comprising: means for transmitting the bit during a first time period to indicate a transmission activity occurring during a second time period subsequent to the first time period. 70. An apparatus for a wireless communication system, comprising: means for periodically receiving a quality indicator, wherein the quality indicator maps to a data rate; means for transmitting data as a function of the quality indicator; and means for transmitting future transmission activity messages during successive time slots. 71. A non-transitory computer-readable medium encoded with a computer program for a wireless communication system, comprising: first plurality of instructions for measuring channel quality of a link in the communication system; second plurality of instructions for periodically transmitting a quality indicator determined based on the channel quality of the link; and third plurality of instructions for receiving data in accordance with a data rate determined based on the periodically transmitted quality indicator, wherein the data rate is used for an initial transmission of the data. 72. A non-transitory computer-readable medium encoded with a computer program for a wireless communication system, comprising: first plurality of instructions for periodically receiving a quality indicator; and second plurality of instructions for transmitting data in accordance with a data rate determined based on the periodically received quality indicator, wherein the data rate is used for an initial transmission of the data. 73. An apparatus for a wireless communication system, comprising: at least one processor configured to: measure channel quality of a link in the communication system; periodically transmit a quality indicator determined based on the channel quality of the link; and receive data in accordance with a data rate determined based on the periodically transmitted quality indicator, wherein the data rate is used for an initial transmission of the data. 74. An apparatus for a wireless communication system, comprising: at least one processor configured to: periodically receive a quality indicator; and transmit data in accordance with a data rate determined based on the periodically received quality indicator, wherein the data rate is used for an initial transmission of the data.
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