Method and device for allocating radio resources in a radio communication system

1. A method comprising:

selecting a time-division-duplex configuration from a plurality of time-division-duplex configurations having different allocations of uplink transmission time and/or allocations of downlink transmission time for subframes for individual ones of the time-division-duplex configurations, the selecting being based on information regarding a sharing characteristic for radio resources in a radio communication system providing radio resources for uplink transmission and for downlink transmission for a plurality of operators providing a service to a user equipment via the radio communication system; and

allocating the radio resources in accordance with the selected time-division-duplex configuration,

wherein at least one time-division-duplex configuration in the plurality of time-division-duplex configurations has at least one entire subframe within a time-division-duplex frame assigned to a specific operator of the plurality of operators and has at least one other entire subframe within the time-division-duplex frame assigned to another operator; and

wherein an allocation among the different allocations of u link transmission time and/or an allocation among the different allocations of downlink transmission time according to the selected time-division-duplex configuration reflects a ratio or an absolute value regarding a resource split between at least the specific operator and the other operator.

2. An apparatus comprising:

at least one processor; and

at least one memory including computer program code, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to perform;

selecting a time-division-duplex configuration from a plurality of time-division-duplex configurations having different allocations of uplink transmission time and/or allocations of downlink transmission time for individual ones of the time-division-duplex configurations, the selecting being based on information regarding a sharing characteristic for radio resources in a radio communication system providing radio resources for uplink transmission and for downlink transmission for a plurality of operators providing a service to a user equipment via the radio communication system; and

allocating the radio resources in accordance with the selected time-division-duplex configuration,

wherein at least one time-division-duplex configuration in the plurality of time-division-duplex configurations has at least one entire subframe within a time-division-duplex frame assigned to a specific operator of the plurality of operators and has at least one other entire subframe within the time-division-duplex frame assigned to another operator; and

wherein an allocation among the different allocations of uplink transmission time and/or an allocation among the different allocations of downlink transmission time according to the selected time-division-duplex configuration reflects a ratio or an absolute value regarding a resource split between at least the specific operator and the other operator.

3. The method according to claim 1 , wherein the selecting is made dynamically or semi-statically.

4. The method according to claim 1 , wherein the selecting is made after a predetermined number of transmission time intervals, TTI, have passed since a previous selecting.

5. The method according to claim 1 , wherein the selecting is deterministic.

6. The method according to claim 1 , wherein at least one specific subframe of a time-division-duplex frame in the selected time-division-duplex configuration is assigned to the specific operator.

7. The method according to claim 1 , wherein at least one transmission slot in one of the plurality of time-division-duplex configurations is configured to be scheduled for at least one user equipment of at least one of the plurality of operators considering a service level agreement of the at least one operator.

8. The method according to claim 1 , wherein the configuration of at least one subframe of a time-division-duplex frame in one of the plurality of time-division-duplex configurations considers a number of active user equipment per operator in a radio cell.

9. The apparatus according to claim 2 , wherein the selecting is made dynamically or semi-statically.

10. The apparatus according to claim 2 , wherein the selecting is made after a predetermined number of transmission time intervals, TTI, have passed since a previous selecting.

11. The apparatus according to claim 2 , wherein at least one specific subframe of a time-division-duplex frame in the selected time-division-duplex configuration is assigned to the specific operator.

12. The apparatus according to claim 2 , wherein at least one transmission slot in a time-division-duplex configuration is configured to be scheduled for at least one user equipment of at least one of the plurality of operators considering a service level agreement of the at least one operator.

13. The apparatus according to claim 2 , wherein the configuration of at least one transmission slot in one of the plurality of time-division duplex configurations considers a number of active user equipment per operator in a radio cell.

14. A computer program product comprising a non-transitory computer-readable storage medium bearing computer program code embodied therein for use with a computer, the computer program code comprising:

code for selecting a time-division-duplex configuration from a plurality of time-division-duplex configurations having different allocations of uplink transmission time and/or allocations of downlink transmission time for individual ones of the time-division-duplex configurations, the selecting being based on information regarding a sharing characteristic for radio resources in a radio communication system providing radio resources for uplink transmission and for downlink transmission for a plurality of operators providing a service to a user equipment via the radio communication system; and

code for allocating the radio resources in accordance with the selected time-division-duplex configuration, wherein at least one time-division-duplex configuration in the plurality of time-division-duplex configurations has at least one entire subframe within a time-division-duplex frame assigned to a specific operator of the plurality of operators and has at least one other entire subfrarne within the time-division-duplex frame assigned to another operator; and

wherein an allocation among the different allocations of uplink transmission time and/or an allocation among the different allocations of downlink transmission time according to the selected time-division-duplex configuration reflects a ratio or an other operator.

15. The method according to claim 1 , wherein the plurality of time-division-duplex configurations have one or more subframes for control information.