Base Station, Method for Radio Communication, Program, Radio Communication System, and Radio Terminal

1. A base station comprising: circuitry configured to: generate a control signal which includes resource information identified by a group identifier assigned to a plurality of radio terminals, the resource information identifying a search space arranged within a data region of a data transmission received by the plurality of radio terminals, the search space including at least one of transmission and reception configuration data for the plurality of radio terminals assigned with the group identifier, wherein the at least one of transmission and reception configuration data of each of the plurality of radio terminals is identified in the search space by a terminal identifier corresponding to each of the plurality of radio terminals; and transmit the control signal.

2. The base station according to claim 1 , wherein an uplink group identifier and a downlink group identifier are assigned to the plurality of radio terminals, and the circuitry generates the control signal to identify uplink resource information by the uplink group identifier and downlink resource information by the downlink group identifier.

3. The base station according to claim 2 , wherein the downlink resource information is information indicating a resource for the plurality of radio terminals to perform simultaneous reception.

4. The base station according to claim 3 , wherein the uplink resource information is information indicating a resource that is to be a reference for each of the plurality of radio terminals to decide a relative position of a transmitter resource.

5. The base station according to claim 4 , wherein the circuitry disposes the resource information identified by a same group identifier in a predetermined frequency region in a control region for transmitting the control signal.

6. The base station according to claim 5 , wherein the circuitry adds a check bit obtained by masking the resource information with the group identifier to the resource information.

7. The base station according to claim 1 , wherein the group identifier for a radio terminal of the plurality of radio terminals is determined based on a unique ID associated with the radio terminal.

8. A method for radio communication, the method comprising: generating, with circuitry, a control signal including resource information identified by a group identifier assigned to a plurality of radio terminals, the resource information identifying a search space arranged within a data region of a data transmission received by the plurality of radio terminals, the search space including at least one of transmission and reception configuration data for the plurality of radio terminals assigned with the group identifier, wherein the at least one of transmission and reception configuration data of each of the plurality of radio terminals is identified in the search space by a terminal identifier corresponding to each of the plurality of radio terminals; and transmitting, with the circuitry, the control signal.

9. A non-transitory computer-readable medium encoded with computer readable instructions that, when executed by a computer, cause the computer to perform a method comprising: generating a control signal including resource information identified by a group identifier assigned to a plurality of radio terminals, the resource information identifying a search space arranged within a data region of a data transmission received by the plurality of radio terminals, the search space including at least one of transmission and reception configuration data for the plurality of radio terminals assigned with the group identifier, wherein the at least one of transmission and reception configuration data of each of the plurality of radio terminals is identified in the search space by a terminal identifier corresponding to each of the plurality of radio terminals; and transmitting the control signal.

10. A radio communication system comprising: a plurality of radio terminals; and a base station that includes circuitry configured to: generate a control signal including resource information identified by a group identifier assigned to the plurality of radio terminals, the resource information identifying a search space arranged within a data region of a data transmission received by the plurality of radio terminals, the search space including at least one of transmission and reception configuration data for the plurality of radio terminals assigned with the group identifier, wherein the at least one of transmission and reception configuration data of each of the plurality of radio terminals is identified in the search space by a terminal identifier corresponding to each of the plurality of radio terminals; and transmit the control signal.

11. A radio terminal comprising: circuitry configured to: receive a control signal from a base station, and acquire resource information identified by a group identifier assigned to a plurality of radio terminals including the radio terminal that receives the control signal, the resource information identifying a search space arranged within a data region of a data transmission received by the plurality of radio terminals, the search space including at least one of transmission and reception configuration data for the plurality of radio terminals assigned with the group identifier, wherein the at least one of transmission and reception configuration data of each of the plurality of radio terminals is identified in the search space by a terminal identifier corresponding to each of the plurality of radio terminals.

12. The radio terminal according to claim 11 , wherein the circuitry acquires information identified by the terminal identifier assigned to the radio terminal from the control signal in a case of determining that the group identifier is not used by the base station.

13. A method for radio communication, performed by a radio terminal, the method comprising: receiving, with circuitry, a control signal from a base station; and acquiring, with the circuitry, resource information identified by a group identifier assigned to a plurality of radio terminals including the radio terminal from the control signal, the resource information identifying a search space arranged within a data region of a data transmission received by the plurality of radio terminals, the search space including at least one of transmission and reception configuration data for the plurality of radio terminals assigned with the group identifier, wherein the at least one of transmission and reception configuration data of each of the plurality of radio terminals is identified in the search space by a terminal identifier corresponding to each of the plurality of radio terminals.

14. A non-transitory computer-readable medium encoded with computer-readable instructions thereon that, when executed by a computer, cause the computer to perform a method comprising: receiving a control signal from a base station; and acquiring resource information identified by a group identifier assigned to a plurality of radio terminals including the radio terminal from the control signal received by the receiver section, the resource information identifying a search space arranged within a data region of a data transmission received by the plurality of radio terminals, the search space including at least one of transmission and reception configuration data for the plurality of radio terminals assigned with the group identifier, wherein the at least one of transmission and reception configuration data of each of the plurality of radio terminals is identified in the search space by a terminal identifier corresponding to each of the plurality of radio terminals.