Beamforming device for providing weight sets
[Object] To enable a cell appropriate for a terminal device to be selected when beamforming is performed. [Solution] Provided is a device including: an acquisition unit configured to acquire multiple weight sets for beamforming; and a control unit configured to map a reference signal for measurement to radio resources associated with a weight set in advance for each weight set included in the multiple weight sets, and multiply the reference signal by the weight set.
1. A device comprising:
circuitry including at least a processor and a memory, the circuitry configured to:
acquire multiple weight sets for beamforming;
associate radio resources with a weight set for each weight set included in the multiple weight sets;
map a reference signal for measurement to the radio resources associated with the weight set in advance of the association for each weight set included in the multiple weight sets; and
multiply the reference signal by the weight set.
2. The device according to claim 1 , wherein the radio resources are radio resources of a data area within a subframe including a control area and the data area.
3. The device according to claim 2 , wherein the radio resources are resource elements other than resource elements for a cell-specific reference signal (CRS) among resource elements of the data area.
4. The device according to claim 1 , wherein the radio resources are radio resources of a specific subframe.
5. The device according to claim 4 , wherein the specific subframe is an MBSFN (MBMS (Multimedia Broadcast Multicast Services) over a Single Frequency Network) subframe.
6. The device according to claim 4 , wherein the circuitry is further configured to notify a terminal device of the specific subframe.
7. The device according to claim 4 , wherein the specific subframe is a subframe that is defined in advance.
8. The device according to claim 1 , wherein the circuitry is further configured to notify a terminal device of the multiple weight sets and the radio resources associated with each of the multiple weight sets.
9. The device according to claim 1 , wherein the radio resources associated with each of the multiple weight sets are radio resources that are defined in advance.
10. The device according to claim 1 , wherein the device is a base station, a base station device for the base station, or a module for the base station device.
11. The device according to claim 10 , wherein the radio resources are different from radio resources that are used by a base station adjacent to the base station in order to transmit a reference signal for measurement multiplied by a weight set for beamforming.
12. The device according to claim 11 , wherein the radio resources associated with the weight set in advance are included in a same subframe as the radio resources used by the adjacent base station.
13. The device according to claim 12 , wherein the radio resources associated with the weight set in advance are included in a resource block of a same band as the radio resources used by the adjacent base station.
14. The device according to claim 12 , wherein the radio resources associated with the weight set in advance are included in a resource block of a different band from the radio resources used by the adjacent base station.
15. The device according to claim 11 , wherein the radio resources associated with the weight set in advance are included in a different subframe from the radio resources used by the adjacent base station.
16. The device according to claim 1 , wherein the circuitry is further configured to multiply a reference signal for demodulation by a selected weight set among the multiple weight sets and notify a terminal device of identification information corresponding to the selected weight set.
17. The device according to claim 16 , wherein the circuitry is further configured to notify the terminal device of the identification information corresponding to the selected weight set in downlink control information.
18. The device according to claim 1 , wherein the multiple weight sets are weight sets for one or more subsets of multiple antennas included in a directional antenna available for large-scale MIMO.
19. The device according to claim 18 , wherein the multiple antennas are arranged in a first direction and a second direction, and the one or more subsets include a first subset including antennas that are arranged in the first direction among the multiple antennas and a second subset including antennas that are arranged in the second direction among the multiple antennas.
20. A method performed by a device comprising circuitry including at least a processor and a memory having a control program executed by the processor to perform the method, the method comprising:
acquire multiple weight sets for beamforming;
associate radio resources with a weight set for each weight set included in the multiple weight sets;
map a reference signal for measurement to the radio resources associated with the weight set in advance of the association for each weight set included in the multiple weight sets; and
multiply the reference signal by the weight set.