METHOD FOR OPTIMIZING SPATIAL MODULATION IN A WIRELESS LINK AND NETWORK ELEMENT THERETO
First Claim
1. A method for selecting a best transmission mode for frame in a wireless channel in every channel conditions, comprisingreceiving at a base station as a response to a request at least one condition figure indicating instantaneous condition of a channel,mapping at the base station the condition figure to a first threshold range, said first threshold range being limited with a first minimum threshold value and a first maximum threshold value and being predefined to correspond the condition figure,selecting at the base station a comparison value to be within the first threshold range,comparing at the base station the comparison value to at least one second threshold range being limited with a second minimum threshold value and a second maximum threshold value, wherein each of said second threshold ranges is stored in the base station and is pre-determined to correspond to a transmission mode of a best transmission data rate,selecting at the base station the transmission mode corresponding to the second threshold range within which the comparison value belongs in order to transmit the frame forwards.
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Accused Products
Abstract
The selection of the spatial mode together with modulation and encoding schemes based on channel condition measurements requested from MS forms a basis for selecting a best transmission data rate in a wireless link in every channel conditions. A method and network element comprising multiple-input multiple-output (MIMO) capable antenna technology allows the use of a best transmission data rate in the channel if selection of transmission mode has been made correctly. The thresholds for transmission mode selections are pre-determined and compared to instantaneous channel quality information. The practical MIMO solution based on correct selection procedure provides also continuous sufficient channel condition for terminal users when the user moves from LOS situation to NLOS situation.
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Citations
28 Claims
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1. A method for selecting a best transmission mode for frame in a wireless channel in every channel conditions, comprising
receiving at a base station as a response to a request at least one condition figure indicating instantaneous condition of a channel, mapping at the base station the condition figure to a first threshold range, said first threshold range being limited with a first minimum threshold value and a first maximum threshold value and being predefined to correspond the condition figure, selecting at the base station a comparison value to be within the first threshold range, comparing at the base station the comparison value to at least one second threshold range being limited with a second minimum threshold value and a second maximum threshold value, wherein each of said second threshold ranges is stored in the base station and is pre-determined to correspond to a transmission mode of a best transmission data rate, selecting at the base station the transmission mode corresponding to the second threshold range within which the comparison value belongs in order to transmit the frame forwards.
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14. A network element in a base station, comprising
a receiver comprising at least one receiving antenna arranged to receive as a response to a request at least one condition figure indicating instantaneous condition of a channel, a controller arranged to map the condition figure to a first threshold range, said first threshold range being limited with a first minimum threshold value and a first maximum threshold value and being predefined to correspond the condition figure, a means for selecting a comparison value arranged to be within the first threshold range, a memory arranged to store at least one second threshold range being limited with a second minimum threshold value and a second maximum threshold value, the second threshold range being pre-determined to correspond to a transmission mode of a best transmission data rate, a decision making block arranged to compare the comparison value to at least one second threshold range, the decision making block arranged to select the transmission mode corresponding to the second threshold range within which the comparison value belongs, and a transmitter comprising at least one transmitting antenna arranged to transmit the frame forwards.
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28. A computer-readable medium having computer-executable components, comprising
receiving as a response to a request at least one condition figure indicating instantaneous condition of a channel, mapping the condition figure to a first threshold range, said first threshold range being limited with a first minimum threshold value and a first maximum threshold value and being predefined to correspond the condition figure, selecting a comparison value arranged to be within the first threshold range, storing at least one second threshold range being limited with a second minimum threshold value and a second maximum threshold value, the second threshold range being pre-determined to correspond to a transmission mode of a best transmission data rate, comparing the comparison value to at least one second threshold range, and selecting the transmission mode corresponding to the second threshold range within which the comparison value belongs.
Specification