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

A wireless terminal device comprising:

• a memory;
• and
• a processor coupled to the memory and configured to:
• execute a reception processing that includes receiving a plurality of sub-frames,
• execute a control channel processing that includes:
• acquiring information from a first control channel placed in a first sub-frame at a predetermined cycle, the predetermined cycle based on a total number of sub-frames in the predetermined cycle, the information indicating a plurality of sub-frames in the predetermined cycle among the sub-frames received by the reception processing, wherein the plurality of sub-frames indicated by the information is less than or equal to the total number of sub-frames in the predetermined cycle, and
• acquiring control information for controlling communication from a second control channel placed in each of the plurality of sub-frames indicated by the information in the first control channel, the second control channel including control information for controlling communication, the control information including at least one communication parameter, wherein a transmission interval of the second control channel is shorter than a transmission interval of the first control channel, and
• execute a data channel processing that includes processing a data channel by using the control information acquired by the control channel processing.

A wireless communication system comprising:

• a base station device;
• and
• a terminal device, wherein
• the base station device includes:
• a first memory, and
• a first processor coupled to the first memory and configured to:
• execute a first generation processing that includes generating a first control channel to be placed in a first sub-frame at a predetermined cycle, the predetermined cycle based on a total number of sub-frames in the predetermined cycle, the first control channel including information indicating a plurality of sub-frames in the predetermined cycle, wherein the plurality of sub-frames indicated by the information is less than or equal to the total number of sub-frames in the predetermined cycle,
• execute a second generation processing that includes generating a second control channel placed in each of the plurality of sub-frames indicated by the information in the first control channel, the second control channel including control information for controlling communication, the control information including at least one communication parameter, wherein a transmission interval of the second control channel is shorter than a transmission interval of the first control channel, and
• execute a transmission processing that includes transmitting the first sub-frame in which the first control channel is placed and a sub-frame in which the second control channel is placed,
• the terminal device includes:
• a second memory, and
• a second processor coupled to the second memory and configured to:
• execute a reception processing that includes receiving the sub-frame transmitted by the transmission processing,
• execute a control channel processing that includes:
• acquiring the information from the first control channel placed in the first sub-frame at the predetermined cycle, the predetermined cycle based on a total number of sub-frames in the predetermined cycle, the information indicating the plurality of sub-frames in the predetermined cycle among the sub-frames received by the reception processing, wherein the plurality of sub-frames indicated by the information is less than or equal to the total number of sub-frames in the predetermined cycle, and
• acquiring the control information from the second control channel placed in each of the plurality of sub-frames indicated by the information in the first control channel, wherein the transmission interval of the second control channel is shorter than the transmission interval of the first control channel, and
• execute a data channel processing that includes processing a data channel by using the control information acquired by the control channel processing.