Mobile station, base station, and communication control method
A mobile station configured to perform radio communication using spatial multiplexing with a base station, the mobile station including: a controller configured to select a data unit with highest channel quality, and to select a spatial layer with highest reception quality belonging to the selected data unit; and a transmitter configured to transmit spatial coding information and first identification information to the base station, the spatial coding information corresponding to the number of spatial layers, and the first identification information identifying the spatial layer selected, and a layer indicator to determine a precoding matrix.
1. A mobile station configured to perform radio communication using spatial multiplexing with a base station, the mobile station comprising:
a controller configured to select a data unit with highest channel quality, and to select a spatial layer with highest reception quality belonging to the selected data unit; and
a transmitter configured to transmit spatial coding information and first identification information to the base station, the spatial coding information corresponding to the number of spatial layers, and the first identification information identifying the spatial layer selected, and a layer indicator to determine a precoding matrix, wherein
the base station determines the precoding matrix by receiving not the precoding matrix itself but only the layer indicator.
2. The mobile station according to claim 1 , wherein
the controller selects the spatial layer with the highest reception quality from the spatial layers belonging to a plurality of data units, and
the transmitter transmits, together with the first identification information, second identification information of the data unit to which the spatial layer belongs, to the base station.
3. The mobile station according to claim 1 , wherein the spatial coding information is first channel state information, and the first identification information is second channel state information.
4. The mobile station according to claim 1 , wherein the transmitter transmits the first identification information of the spatial layer with a second highest reception quality to the base station as third channel state information subsequent to second channel state information.
5. The mobile station according to claim 1 , wherein the transmitter transmits the first identification information after transmitting the spatial coding information.
6. The mobile station according to claim 1 , wherein the controller selects the data unit with highest channel quality from a plurality of data units, and selects the spatial layer with highest reception quality from a plurality of spatial layers belonging to the selected data unit with the highest channel quality.
7. A base station configured to perform radio communication using spatial multiplexing with a mobile station, the base station comprising:
a transmitter configured to transmit a reference signal to the mobile station; and
a receiver configured to receive spatial coding information and identification information from the mobile station that received the reference signal, the spatial coding information corresponding to the number of spatial layers, and the identification information identifying a spatial layer with highest reception quality belonging to selected data unit by the mobile station, and a layer indicator to determine a precoding matrix, wherein
the base station determines the precoding matrix by receiving not the precoding matrix itself but only the layer indicator.
8. The base station according to claim 7 , wherein the transmitter transmits the identification information after transmitting the spatial coding information.
9. The base station according to claim 7 , further comprising a controller configured to control the spatial multiplexing according to the identification information.
10. The base station according to claim 9 , wherein the controller determines the spatial coding information by using the identification information, and executes the spatial multiplexing based on the spatial coding information determined.
11. A communication system comprising:
a mobile station; and
a base station configured to perform radio communication using spatial multiplexing with a mobile station, wherein
the mobile station includes:
a controller configured to select a data unit with highest channel quality, and to select a spatial layer with highest reception quality belonging to the selected data unit; and
a transmitter configured to transmit spatial coding information and identification information to the base station, the spatial coding information corresponding to the number of spatial layers, and the identification information identifying the spatial layer selected, and a layer indicator to determine a precoding matrix,
the base station includes:
a receiver configured to receive the spatial coding information and the identification information, wherein
the base station determines the precoding matrix by receiving not the precoding matrix itself but only the layer indicator.