Wireless communication system, wireless base station, wireless terminal, and wireless communication method

A wireless base station comprising:

• a memory;
• and
• a processor coupled to the memory and configured
• to transmit to a wireless terminal a downlink frame including data and a downlink control signal for decoding the data, the downlink control signal being mapped to a first downlink control resource element of downlink control resource elements that are resource units used for transmissions of downlink control signals in the downlink frame, and
• to receive from the wireless terminal an uplink frame including an uplink control signal for acknowledging a decoding result of the data, the uplink control signal being mapped to a first uplink control resource element of uplink control resource elements that are resource units used for transmissions of uplink control signals in the uplink frame, the first uplink control resource element being determined by shifting a second uplink control resource element of the uplink control resource elements by an offset number whose unit is one of the uplink control resource elements, the second uplink control resource element being determined based on a location of the first downlink control resource element in the downlink frame, the offset number being determined based on a first offset information included in the downlink control signal.

A wireless terminal comprising:

• a memory;
• and
• a processor coupled to the memory and configured
• to receive from a wireless base station a downlink frame including data and a downlink control signal for decoding the data, the downlink control signal being mapped to a first downlink control resource element of downlink control resource elements that are resource units used for transmissions of downlink control signals in the downlink frame, and
• to transmit an uplink frame including an uplink control signal for acknowledging a decoding result of the data, the uplink control signal being mapped to a first uplink control resource element of uplink control resource elements that are resource units used for transmissions of uplink control signals in the uplink frame, the first uplink control resource element being determined by shifting a second uplink control resource element of the uplink control resource elements by an offset number whose unit is one of the uplink control resource elements, the second uplink control resource element being determined based on a location of the first downlink control resource element in the downlink frame, the offset number being determined based on a first offset information included in the downlink control signal.