Method and Apparatus for Controlling Adaptive Rank Multi Antenna Communication
First Claim
1. A method of controlling adaptive rank multi-antenna wireless communication for a mobile terminal capable of receiving a number N or less different data streams transmitted in parallel over N antennas, the number of different data streams actually transmitted in parallel to the mobile terminal corresponding to transmission rank, the method comprising:
- utilizing a full-size codebook containing precoder elements for all N transmission ranks to determine a recommended transmission rank and precoder matrix for use in transmitting data to the mobile terminal if a speed of the mobile terminal does not exceed a predetermined threshold;
utilizing a reduced-size codebook which excludes the precoder elements for at least transmission rank-N to determine the recommended transmission rank and precoder matrix for use in transmitting data to the mobile terminal if the speed of the mobile terminal exceeds the predetermined threshold, wherein transmission rank-N corresponds to N different data streams being transmitted in parallel over the N antennas; and
transmitting an indication of the recommended transmission rank and precoder matrix to the network.
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Accused Products
Abstract
A mobile terminal can receive N or less different data streams transmitted in parallel over N antennas. The number of different data streams actually transmitted in parallel to the mobile terminal corresponds to transmission rank. If the speed of the mobile terminal does not exceed a predetermined threshold, the mobile terminal utilizes a full-size codebook containing precoder elements for all N transmission ranks to determine a recommended transmission rank and precoder matrix for use in transmitting data to the mobile terminal. Otherwise, the mobile terminal utilizes a reduced-size codebook which excludes the precoder elements for at least transmission rank-N to determine the recommended transmission rank and precoder matrix where transmission rank-N corresponds to N different data streams being transmitted in parallel over the N antennas. The mobile terminal transmits an indication of the recommended transmission rank and precoder matrix to the network.
32 Citations
22 Claims
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1. A method of controlling adaptive rank multi-antenna wireless communication for a mobile terminal capable of receiving a number N or less different data streams transmitted in parallel over N antennas, the number of different data streams actually transmitted in parallel to the mobile terminal corresponding to transmission rank, the method comprising:
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utilizing a full-size codebook containing precoder elements for all N transmission ranks to determine a recommended transmission rank and precoder matrix for use in transmitting data to the mobile terminal if a speed of the mobile terminal does not exceed a predetermined threshold; utilizing a reduced-size codebook which excludes the precoder elements for at least transmission rank-N to determine the recommended transmission rank and precoder matrix for use in transmitting data to the mobile terminal if the speed of the mobile terminal exceeds the predetermined threshold, wherein transmission rank-N corresponds to N different data streams being transmitted in parallel over the N antennas; and transmitting an indication of the recommended transmission rank and precoder matrix to the network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A mobile terminal capable of receiving a number N or less different data streams transmitted in parallel over N antennas, the number of different data streams actually transmitted in parallel to the mobile terminal corresponding to transmission rank, the mobile terminal comprising:
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a processing circuit operable to; utilize a full-size codebook containing precoder elements for all N transmission ranks to determine a recommended transmission rank and precoder matrix for use in transmitting data to the mobile terminal if a speed of the mobile terminal does not exceed a predetermined threshold; and utilize a reduced-size codebook which excludes the precoder elements for at least transmission rank-N to determine the recommended transmission rank and precoder matrix for use in transmitting data to the mobile terminal if the speed of the mobile terminal exceeds the predetermined threshold, wherein transmission rank-N corresponds to N different data streams being transmitted in parallel over the N antennas; and a transmitter operable to transmit an indication of the recommended transmission rank and precoder matrix to the network. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification