RECEIVER DEVICE, TRANSMITTER DEVICE, RECEPTION METHOD, AND TRANSMISSION METHOD

• US 20180352538A1
• Filed: 08/07/2018
• Published: 12/06/2018
• Est. Priority Date: 02/16/2012
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Horiuchi, Ayako, Suzuki, Hidetoshi, Nishio, Akihiko, Hoshino, Masayuki
• Granted Patent: US 10,681,688 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04B 7/068 using space frequency diversity space-frequency coding H04L1/0606
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 27/2649 Demodulators
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Provided is a receiver device that can switch between transmission methods, while minimizing increase in the number of blind decryption iterations and the amount of signaling needed for acknowledgement. In this device, a receiver part (201) receives a signal mapped to any of a plurality of mapping candidates; and according to application levels established for each of the plurality of mapping candidates, a control signal processor (205) performs blind decryption of the plurality of mapping candidates, employing either a first transmission method using a single antenna port to carry out precoding based on feedback information from the receiver device, or a second transmission method involving transmission diversity employing multiple antenna ports.

Claims

1. A communication apparatus comprising:

a receiver, which, in operation, receives a precoded downlink control signal mapped to one of a plurality of mapping candidates,

wherein the precoded downlink control signal is prepared by a base station apparatus using a first precoding for single-antenna transmission in localized allocation mode, and

wherein the precoded downlink control signal is prepared by the base station apparatus using a second precoding for multi-antenna transmission in distributed allocation mode; and

a decoder, which, in operation, performs blind decoding on the plurality of mapping candidates using one of a first method corresponding to the single-antenna transmission and a second method corresponding to the multi-antenna transmission.

2. The communication apparatus according to claim 1, wherein the second precoding for the multi-antenna transmission is applied to an Enhanced Physical Downlink Control Channel (EPDCCH) candidate whose aggregation level is equal to or greater than a threshold value.

3. The communication apparatus according to claim 1, wherein the second precoding for the multi-antenna transmission is a precoding for transmission diversity.

4. The communication apparatus according to claim 1, wherein,

the base station apparatus comprises three or more antenna ports;

a single antenna port among the three or more antenna ports is used in the localized allocation mode; and

two antenna ports among the three or more antenna ports are used in the distributed allocation mode.

5. The communication apparatus according to claim 4, wherein the three or more antenna ports provide several subsets of antenna ports, and one of the several subsets of antenna ports is used in the distributed allocation mode.

6. The communication apparatus according to claim 1, wherein resources in the localized allocation mode are localized in a frequency domain, and resources in the distributed allocation mode are distributed in the frequency domain.

7. The communication apparatus according to claim 1, wherein a plurality of first aggregation levels used in the distributed allocation mode at least partially overlaps with a plurality of second aggregation levels used in the localized allocation mode and includes at least one more aggregation level that is higher than any one of the second aggregation levels.

8. A communication method comprising:

receiving a precoded downlink control signal mapped to one of a plurality of mapping candidates,

wherein the precoded downlink control signal is prepared by a base station apparatus using a first precoding for single-antenna transmission in localized allocation mode, and

wherein the precoded downlink control signal is prepared by the base station apparatus using a second precoding for multi-antenna transmission in distributed allocation mode; and

performing blind decoding on the plurality of mapping candidates using one of a first method corresponding to the single-antenna transmission and a second method corresponding to the multi-antenna transmission.

9. The communication method according to claim 8, wherein the second precoding for the multi-antenna transmission is applied to an Enhanced Physical Downlink Control Channel (EPDCCH) candidate whose aggregation level is equal to or greater than a threshold value.

10. The communication method according to claim 8, wherein the second precoding for the multi-antenna transmission is a precoding for transmission diversity.

11. The communication method according to claim 8, wherein,

the base station apparatus comprises three or more antenna ports;

a single antenna port among the three or more antenna ports is used in the localized allocation mode; and

two antenna ports among the three or more antenna ports are used in the distributed allocation mode.

12. The communication method according to claim 11, wherein the three or more antenna ports provide several subsets of antenna ports, and one of the several subsets of antenna ports is used in the distributed allocation mode.

13. The communication method according to claim 8, wherein resources in the localized allocation mode are localized in a frequency domain, and resources in the distributed allocation mode are distributed in the frequency domain.

14. The communication method according to claim 8, wherein a plurality of first aggregation levels used in the distributed allocation mode at least partially overlaps with a plurality of second aggregation levels used in the localized allocation mode and includes at least one more aggregation level that is higher than any one of the second aggregation levels.