A communication control device adapted to control radio communication conducted by one or more terminal devices according to a time-division duplex scheme, the communication control device comprising: a configuration section adapted to configure, for each frame that includes a plurality of subframes, a link direction configuration expressing a link direction per subframe; and a control section adapted to signal the link direction configuration configured by the configuration section to each terminal device, wherein the configuration section is adapted to configure a first link direction configuration for a first terminal group, and to configure a second link direction configuration for a second terminal group, and the control section is adapted to signal the first link direction configuration to a terminal device belonging to the first terminal group on a first cycle, and to signal the second link direction configuration to a terminal device belonging to the second terminal group on a second cycle that is shorter than the first cycle, wherein the configuration section is adapted to configure a configuration as the first link direction configuration, and to configure a configuration derived by substituting an uplink subframe in the first link direction configuration with a downlink subframe as the second link direction configuration, wherein the first link direction configuration has a higher uplink to downlink ratio than the second link direction configuration, wherein the configuration section is adapted to select the second link direction configuration to configure from a set of configurations limited on the basis of the configured first link direction configuration, wherein the control section is adapted to signal the first link direction configuration in a system information block, and to signal the second link direction configuration in a control information region different from the SIB and having a shorter update cycle than the SIB, wherein the configuration section is adapted to select the first link direction configuration and the second link direction configuration to configure in each frame on the basis of a ratio of the amount of traffic between uplink traffic and downlink traffic, wherein a terminal device belonging to the second terminal group is adapted to operate in a first operating mode in which a link direction configuration is updated on the first cycle, and a second operating mode in which a link direction configuration is updated on the second cycle, and wherein the control section is adapted to instruct the terminal device belonging to the second terminal group to switch to the second operating mode if the ratio of the amount of traffic between uplink traffic and downlink traffic satisfies a predetermined condition. a configuration section adapted to configure, for each frame that includes a plurality of subframes, a link direction configuration expressing a link direction per subframe; and a control section adapted to signal the link direction configuration configured by the configuration section to each terminal device, wherein the configuration section is adapted to configure a first link direction configuration for a first terminal group, and to configure a second link direction configuration for a second terminal group, and the control section is adapted to signal the first link direction configuration to a terminal device belonging to the first terminal group on a first cycle, and to signal the second link direction configuration to a terminal device belonging to the second terminal group on a second cycle that is shorter than the first cycle, wherein the configuration section is adapted to configure a configuration as the first link direction configuration, and to configure a configuration derived by substituting an uplink subframe in the first link direction configuration with a downlink subframe as the second link direction configuration, wherein the first link direction configuration has a higher uplink to downlink ratio than the second link direction configuration, wherein the configuration section is adapted to select the second link direction configuration to configure from a set of configurations limited on the basis of the configured first link direction configuration, wherein the control section is adapted to signal the first link direction configuration in a system information block, and to signal the second link direction configuration in a control information region different from the SIB and having a shorter update cycle than the SIB, wherein the configuration section is adapted to select the first link direction configuration and the second link direction configuration to configure in each frame on the basis of a ratio of the amount of traffic between uplink traffic and downlink traffic, wherein a terminal device belonging to the second terminal group is adapted to operate in a first operating mode in which a link direction configuration is updated on the first cycle, and a second operating mode in which a link direction configuration is updated on the second cycle, and wherein the control section is adapted to instruct the terminal device belonging to the second terminal group to switch to the second operating mode if the ratio of the amount of traffic between uplink traffic and downlink traffic satisfies a predetermined condition.