Terminal device, base station device, communication method, and integrated circuit
A terminal device and a base station device efficiently communicate with each other. For the terminal device, in a case that third information is configured, a third maximum number of layers assumed for determining a bit width for a first RI and a fourth maximum number of layers assumed for determining a bit width for a second RI are provided, based on the third information. In a case that third information is not configured, (i) the third maximum number is provided, based on the smallest of a first number and a second number, and (ii) the fourth maximum number is provided, based on a smallest one of the first number and a third number. The first number is a second maximum number of the layers indicated by second information, the second number is a largest one of the number of antenna ports of a plurality of first CSI-RS resources, and the third number is a largest one of the number of antenna ports of a plurality of second CSI-RS resources.
1. A terminal device comprising:
transmission circuitry configured to transmit a first Rank Indicator (RI) associated with any one of one or more first Channel State Information Reference Signal (CSI-RS) resource in a first Channel State Information (CSI) process in a first downlink component carrier of a first bandwidth class of a first band in a first band combination and a second RI associated with any one of one or more second CSI-RS resource in a second CSI process in the first downlink component carrier; and
reception circuitry configured to receive a Physical Downlink Shared CHannel (PDSCH) in the first downlink component carrier, wherein
each of the first RI and the second RI is an RI for PDSCH transmission in the first downlink component carrier,
the transmission circuitry is configured to transmit capability information including first information and second information,
the reception circuitry is configured to receive third information indicating a first maximum quantity of layers for the first downlink component carrier,
the first information indicates the first bandwidth class corresponding to a quantity of contiguous downlink component carriers in the first band supported by the terminal device,
the second information indicates second maximum quantities of layers supported by the terminal device, the second maximum quantities corresponding to respective ones of bandwidth classes of the first band, the bandwidth classes including the first bandwidth class,
in a case that the third information is configured, a third maximum quantity of layers assumed for determining a bit width for the first RI and a fourth maximum quantity of layers assumed for determining a bit width for the second RI are determined according to the third information,
in a case that the third information is not configured, (i) the third maximum quantity of layers assumed for determining the bit width for the first RI is determined according to a smallest one of a first number and a second number, and (ii) the fourth maximum quantity of layers assumed for determining the bit width for the second RI is determined according to a smallest one of the first number and a third number,
the first number is maximum of the second maximum quantities of layers,
the second number is a largest one among one or more quantity of first antenna ports, the one or more quantity of first antenna ports being associated with respective ones of the one or more first CSI-RS resource in the first CSI process, and
the third number is a largest one among one or more quantity of second antenna ports, the one or more quantity of second antenna ports being associated with respective ones of the one or more second CSI-RS resource in the second CSI process.
2. A base station device comprising:
reception circuitry configured to receive a first Rank Indicator (RI) associated with any one of one or more first Channel State Information Reference Signal (CSI-RS) resource in a first Channel State Information (CSI) process in a first downlink component carrier of a first bandwidth class of a first band in a first band combination and a second RI associated with any one of one or more second CSI-RS resource in a second CSI process in the first downlink component carrier; and
transmission circuitry configured to transmit a Physical Downlink Shared CHannel (PDSCH) in the first downlink component carrier, wherein
each of the first RI and the second RI is an RI for PDSCH transmission in the first downlink component carrier,
the reception circuitry is configured to receive capability information including first information and second information,
the transmission circuitry is configured to transmit third information indicating a first maximum quantity of layers for the first downlink component carrier,
the first information indicates the first bandwidth class corresponding to a quantity of contiguous downlink component carriers in the first band supported by the terminal device,
the second information indicates second maximum quantities of layers supported by the terminal device, the second maximum quantities corresponding to respective ones of bandwidth classes of the first band, the bandwidth classes including the first bandwidth class,
in a case that the third information is configured, a third maximum quantity of layers assumed for determining a bit width for the first RI and a fourth maximum quantity of layers assumed for determining a bit width for the second RI are determined according to the third information,
in a case that the third information is not configured, (i) the third maximum quantity of layers assumed for determining the bit width for the first RI is determined according to a smallest one of a first number and a second number, and (ii) the fourth maximum quantity of layers assumed for determining the bit width for the second RI is determined according to a smallest one of the first number and a third number,
the first number is maximum of the second maximum quantities of layers,
the second number is a largest one among one or more quantity of first antenna ports, the one or more quantity of first antenna ports being associated with respective ones of the one or more first CSI-RS resource in the first CSI process, and
the third number is a largest one among one or more quantity of second antenna ports, the one or more quantity of second antenna ports being associated with respective ones of the one or more second CSI-RS resource in the second CSI process.
3. A communication method to be used by a terminal device, the communication method comprising:
transmitting a first Rank Indicator (RI) associated with any one of one or more first Channel State Information Reference Signal (CSI-RS) resource in a first Channel State Information (CSI) process in a first downlink component carrier of a first bandwidth class of a first band in a first band combination and a second RI associated with any one of one or more second CSI-RS resource in a second CSI process in the first downlink component carrier; and
receiving a Physical Downlink Shared CHannel (PDSCH) in the first downlink component carrier, wherein
each of the first RI and the second RI is an RI for PDSCH transmission in the first downlink component carrier,
transmitting capability information including first information and second information; and
receiving third information indicating a first maximum quantity of layers for the first downlink component carrier, wherein
the first information indicates the first bandwidth class corresponding to a quantity of contiguous downlink component carriers in the first band supported by the terminal device,
the second information indicates second maximum quantities of layers supported by the terminal device, the second maximum quantities corresponding to respective ones of bandwidth classes of the first band, the bandwidth classes including the first bandwidth class,
in a case that the third information is configured, a third maximum quantity of layers assumed for determining a bit width for the first RI and a fourth maximum quantity of layers assumed for determining a bit width for the second RI are determined according to the third information,
in a case that the third information is not configured, (i) the third maximum quantity of layers assumed for determining the bit width for the first RI is determined according to a smallest one of a first number and a second number, and (ii) the fourth maximum quantity of layers assumed for determining the bit width for the second RI is determined according to a smallest one of the first number and a third number,
the first number is maximum of the second maximum quantities of layers,
the second number is a largest one among one or more quantity of first antenna ports, the one or more quantity of first antenna ports being associated with respective ones of the one or more first CSI-RS resource in the first CSI process, and
the third number is a largest one among one or more quantity of second antenna ports, the one or more quantity of second antenna ports being associated with respective ones of the one or more second CSI-RS resource in the second CSI process.
4. A communication method to be used by a base station device, the communication method comprising:
receiving a first Rank Indicator (RI) associated with any one of one or more first Channel State Information Reference Signal (CSI-RS) resource in a first Channel State Information (CSI) process in a first downlink component carrier of a first bandwidth class of a first band in a first band combination and a second RI associated with any one of one or more second CSI-RS resource in a second CSI process in the first downlink component carrier; and
transmitting a Physical Downlink Shared CHannel (PDSCH) in the first downlink component carrier, wherein
each of the first RI and the second RI is an RI for PDSCH transmission in the first downlink component carrier,
receiving capability information including first information and second information; and
transmitting third information indicating a first maximum quantity of layers for the first downlink component carrier, wherein
the first information indicates the first bandwidth class corresponding to a quantity of contiguous downlink component carriers in the first band supported by the terminal device,
the second information indicates second maximum quantities of layers supported by the terminal device, the second maximum quantities corresponding to respective ones of bandwidth classes of the first band, the bandwidth classes including the first bandwidth class,
in a case that the third information is configured, a third maximum quantity of layers assumed for determining a bit width for the first RI and a fourth maximum quantity of layers assumed for determining a bit width for the second RI are determined according to the third information,
in a case that the third information is not configured, (i) the third maximum quantity of layers assumed for determining the bit width for the first RI is determined according to a smallest one of a first number and a second number, and (ii) the fourth maximum quantity of layers assumed for determining the bit width for the second RI is determined according to a smallest one of the first number and a third number,
the first number is maximum of the second maximum quantities of layers,
the second number is a largest one among one or more quantity of first antenna ports, the one or more quantity of first antenna ports being associated with respective ones of the one or more first CSI-RS resource in the first CSI process, and
the third number is a largest one among one or more quantity of second antenna ports, the one or more quantity of second antenna ports being associated with respective ones of the one or more second CSI-RS resource in the second CSI process.