Method and System for Diversity Using Orthogonal Frequency/Division Multiplexing
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Abstract
A method and system for achieving a link budget improvement in a diverse OFDM radio system by addressing the timing misalignment issue that can occur due to the differences in propagation time in signals between mobile stations and Radio Access Nodes. Timing misalignment is shared or split between the primary path to a primary Radio Access Node and a diverse path to a diverse Radio Access Node. The relative timing offsets between mobile stations are adjusted, the mobile stations are grouped into zones using a variety of different grouping techniques, and the transmission for each mobile station is scheduled, using one or more of a variety of scheduling techniques.
13 Citations
54 Claims
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1-20. -20. (canceled)
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21. A method for operating a base station in order to reduce timing misalignments of a system including a plurality of satellites and a plurality of mobile stations, the method comprising:
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receiving a plurality of sets of time values, wherein each of the sets is associated with a respective one of the satellites, wherein the time values of each set represent arrival times of respective uplink transmissions from the respective mobile stations via the associated satellite, wherein the plurality of sets of time values are based on time delays applied respectively by the mobile stations to the respective uplink transmissions; modifying the time delays to decrease a maximum of worst case deviations over the plurality of satellites, wherein the worst case deviation associated with each satellite is a largest of absolute values of time differences between the arrival times of the associated set; providing the modified time delays respectively to the mobile stations so that the mobile stations are enabled to apply the modified time delays to the respective uplink transmissions. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A base station for reducing timing misalignments of a system including a plurality of satellites and a plurality of mobile stations, the base station comprising:
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a processor; and memory storing program instructions that are executable by the processor, wherein the program instructions, when executed by the processor, cause the processor to; receive a plurality of sets of time values, wherein each of the sets is associated with a respective one of the satellites, wherein the time values of each set represent arrival times of respective uplink transmissions from the respective mobile stations via the associated satellite, wherein the plurality of sets of time values are based on time delays applied respectively by the mobile stations to the respective uplink transmissions; modify the time delays to decrease a maximum of worst case deviations over the plurality of satellites, wherein the worst case deviation associated with each satellite is a largest of absolute values of time differences between the arrival times of the associated set; and provide the modified time delays respectively to the mobile stations so that the mobile stations are enabled to apply the modified time delays to the respective uplink transmissions. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method for operating a base station in order to reduce timing misalignments of downlink transmissions from a plurality of satellites to a plurality of mobile stations, the method comprising:
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receiving a plurality of sets of time values, wherein each of the sets is associated with a respective one of the mobile stations, wherein the time values of each set represent arrival times of respective downlink transmissions from the respective satellites to the associated mobile station, wherein the plurality of sets of time values are based on time delays applied respectively by the satellites to the respective downlink transmissions; modifying the time delays to decrease a maximum of worst case deviations over the plurality of mobile stations, wherein the worst case deviation associated with each mobile station is a largest of absolute values of time differences between the arrival times of the associated set; providing the modified time delays respectively to the satellites so that the satellites are enabled to apply the modified time delays to the respective downlink transmissions. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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48. A base station for reducing timing misalignments of a system including a plurality of satellites and a plurality of mobile stations, the base station comprising:
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a processor; and memory storing program instructions that are executable by the processor, wherein the program instructions, when executed by the processor, cause the processor to; receive a plurality of sets of time values, wherein each of the sets is associated with a respective one of the mobile stations, wherein the time values of each set represent arrival times of respective downlink transmissions from the respective satellites to the associated mobile station, wherein the plurality of sets of time values are based on time delays applied respectively by the satellites to the respective downlink transmissions; modify the time delays to decrease a maximum of worst case deviations over the plurality of mobile stations, wherein the worst case deviation associated with each mobile station is a largest of absolute values of time differences between the arrival times of the associated set; provide the modified time delays respectively to the satellites so that the satellites are enabled to apply the modified time delays to the respective downlink transmissions. - View Dependent Claims (49, 50, 51, 52, 53, 54)
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Specification