Apparatus and method for changing communication mode in multi-antenna system considering channel environment
First Claim
1. A method for determining a multi-antenna transmission mode at a base station in a multi-antenna system, the method comprising:
- when operating in a Multiple Input Multiple Output (MIMO) transmission mode as a multi-antenna transmission mode, determining a reference set point;
updating a set point for transmit power control of a terminal according to an error occurrence in a signal received from the terminal;
determining whether a channel to the terminal is a channel for applying the MIMO transmission mode by comparing the updated set point with the reference set point; and
when the channel to the terminal is not the channel for applying the MIMO transmission mode, changing the multi-antenna transmission mode to a fixed transmission mode,wherein the reference set point comprises a value for determining whether the channel to the terminal is the channel for applying the MIMO transmission mode, andthe fixed transmission mode is a multi-antenna transmission mode operating in a Single Input Multiple Output (SIMO) transmission mode during a reference time.
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Accused Products
Abstract
An apparatus and a method for determining a multi-antenna transmission mode at a base station in a multi-antenna system are provided. The method for determining the multi-antenna transmission mode includes when using a Multiple Input Multiple Output (MIMO) transmission mode as a multi-antenna transmission mode, determining a reference set point; updating a set point for transmit power control of a terminal according to an error occurrence of a signal received from the terminal; determining whether a channel to the terminal is a channel for applying the MIMO transmission mode by comparing the updated set point with the reference set point; and when the channel to the terminal is not a channel for applying the MIMO transmission mode, changing the multi-antenna transmission mode to a fixed transmission mode.
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Citations
20 Claims
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1. A method for determining a multi-antenna transmission mode at a base station in a multi-antenna system, the method comprising:
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when operating in a Multiple Input Multiple Output (MIMO) transmission mode as a multi-antenna transmission mode, determining a reference set point; updating a set point for transmit power control of a terminal according to an error occurrence in a signal received from the terminal; determining whether a channel to the terminal is a channel for applying the MIMO transmission mode by comparing the updated set point with the reference set point; and when the channel to the terminal is not the channel for applying the MIMO transmission mode, changing the multi-antenna transmission mode to a fixed transmission mode, wherein the reference set point comprises a value for determining whether the channel to the terminal is the channel for applying the MIMO transmission mode, and the fixed transmission mode is a multi-antenna transmission mode operating in a Single Input Multiple Output (SIMO) transmission mode during a reference time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining a multi-antenna transmission mode at a base station in a multi-antenna system, the method comprising:
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when operating in a Multiple Input Multiple Output (MIMO) transmission mode as a multi-antenna transmission mode, determining a reference Carrier to Interference and Noise Ratio (CINR); measuring a CINR using a signal received from a terminal; determining whether a channel to the terminal is a channel for applying the MIMO transmission mode by comparing the measured CINR with the reference CINR; and when the channel to the terminal is not a channel for applying the MIMO transmission mode, changing the multi-antenna transmission mode to a fixed transmission mode, wherein the reference CINR comprises a CINR for determining whether the channel to the terminal is a channel for applying the MIMO transmission mode, and the fixed transmission mode is a multi-antenna transmission mode operating in a Single Input Multiple Output (SIMO) transmission mode during a reference time. - View Dependent Claims (8, 9, 10, 11)
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12. An apparatus for determining a multi-antenna transmission mode at a base station in a multi-antenna system, the apparatus comprising:
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at least two antennas; a receiver configured to receive a signal via the antennas; a power controller configured to update a set point for transmit power control of a terminal according to an error occurrence of a signal received from the terminal when using a Multiple Input Multiple Output (MIMO) transmission mode as a multi-antenna transmission mode; a channel checker configured to determine whether a channel to the terminal is a channel for applying the MIMO transmission mode by comparing the set point updated by the power controller with a reference set point; and a mode determiner configured to select the multi-antenna transmission mode over a fixed transmission mode when the channel to the terminal is not a channel for applying the MIMO transmission mode, wherein the reference set point comprises a value configured to determine whether the channel to the terminal is a channel for applying the MIMO transmission mode, and the fixed transmission mode is a multi-antenna transmission mode operating in a Single Input Multiple Output (SIMO) transmission mode during a reference time. - View Dependent Claims (13, 14, 15, 16)
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17. An apparatus for determining a multi-antenna transmission mode at a base station in a multi-antenna system, the apparatus comprising:
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at least two antennas; a receiver configured to receive a signal via the antennas; a channel estimator configured to measure a Carrier to Interference and Noise Ratio (CINR) using a signal received from a terminal when using a Multiple Input Multiple Output (MIMO) transmission mode as a multi-antenna transmission mode of an uplink; a channel checker configured to determine whether a channel to the terminal is a channel for applying the MIMO transmission mode by comparing the CINR measured by the channel estimator with a reference CINR; and a mode determiner configured to select the multi-antenna transmission mode over a fixed transmission mode when the channel to the terminal is not the channel for applying the MIMO transmission mode, wherein the reference CINR comprises a CINR configured to determine whether the channel to the terminal is the channel for applying the MIMO transmission mode, and the fixed transmission mode is a multi-antenna transmission mode operating in a Single Input Multiple Output (SIMO) transmission mode during a reference time. - View Dependent Claims (18, 19, 20)
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Specification