Base station side device and method for wireless communication, and user side device and method for wireless communication

1. A device at a user equipment (UE) side for wireless communications, the device comprising:

at least one processor; and

at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the device to at least:

transmit, to a base station, information of beam direction between the base station and the UE;

receive, from the base station, reference signal configuration for the UE determined by the base station based on the information of beam direction, the reference signal configuration indicating selected downlink reference signals and associated resource elements for the selected downlink reference signals, the selected downlink reference signals being transmitted to the UE via beams with different beam directions;

determine, based on the reference signal configuration for the UE, the selected downlink reference signals and the associated resource elements, the selected downlink reference signals and the associated resource elements being associated with antenna ports; and

receive and measure the selected downlink reference signals using the antenna ports on the associated resource elements.

2. The device according to claim 1 , wherein the reference signal configuration for the UE includes an indication of sequence numbers of the selected downlink reference signals.

3. The device according to claim 2 , wherein a sequence number of one of the selected downlink reference signals is associated with a sequence number of one of the antenna ports.

4. The device according to claim 1 , wherein the at least one memory including the computer program code is configured with the at least one processor to cause the device to perform a channel status measurement or channel estimation based on the selected downlink reference signals.

5. The device according to claim 1 , wherein the selected downlink reference signals are beam-formed reference signals that are subject to a beam-forming processing.

6. The device according to claim 1 , wherein the different beam directions correspond to downlink reference signals having different sequence numbers.

7. The device according to claim 1 , wherein the reference signal configuration is formed in a bitmap, with each bit in the bitmap indicating whether a corresponding downlink reference signal is to be used or not.

8. The device according to claim 7 , wherein a number of bits in the bitmap is equal to a number of available downlink reference signals or a number of antenna ports.

9. The device according to claim 1 , wherein available downlink reference signals are divided into multiple subsets, and the reference signal configuration includes sequence numbers of the subsets where the selected downlink reference signals are located and sequence numbers of the selected downlink reference signal in the subsets.

10. A device at a base station side for wireless communications, the device comprising:

at least one processor; and

at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the device to at least:

receive, from a user equipment (UE), information of beam direction between the base station and the (UE);

determine a reference signal configuration for the UE based on the information of beam direction, the reference signal configuration indicating a selected downlink reference signals and associated resource elements for the selected downlink reference signals, the selected downlink reference signals being transmitted to the UE via beams with different beam directions;

transmit, to the UE, the determined reference signal configuration for the UE; and

transmit the selected downlink reference signals with the associated resource elements on antenna ports to the UE, the selected downlink reference signals and the associated resource elements being associated with the antenna ports.

11. The device according to claim 10 , wherein the different beam directions correspond to downlink reference signals having different sequence numbers.

12. The device according to claim 10 , wherein the reference signal configuration is formed in a bitmap, with each bit in the bitmap indicating whether a corresponding downlink reference signal is to be used or not.

13. The device according to claim 12 , wherein a number of bits in the bitmap is equal to a number of available downlink reference signals or a number of antenna ports.

14. The device according to claim 10 , wherein the selected downlink reference signals are beam-formed reference signals that are subject to beam-forming processing.

15. The device according to claim 10 , wherein the reference signal configuration for the UE includes an indication of a sequence number of the selected downlink reference signals.

16. The device according to claim 15 , wherein a sequence number of one of the selected downlink reference signals are associated with a sequence number of one of the antenna ports.

17. The device according to claim 10 , wherein available downlink reference signals are divided into multiple subsets, and the reference signal configuration includes sequence numbers of the subsets where the selected downlink reference signals are located and sequence numbers of the selected downlink reference signals in the subsets.

18. A method of operating a device at a user equipment (UE) side for wireless communications, the method comprising:

transmitting, to a base station, information of beam direction between the base station and the UE;

receiving, from the base station, reference signal configuration for the UE determined by the base station based on the information of beam direction, the reference signal configuration indicating selected downlink reference signals and associated resource elements for the selected downlink reference signals, the selected downlink reference signals being transmitted to the UE via beams with different beam directions;

determining, based on the reference signal configuration for the UE, the selected downlink reference signals and the associated resource elements, the selected downlink reference signals and the associated resource element being associated with antenna ports; and

receiving and measuring the selected downlink reference signals using the antenna ports on the associated resource elements.

19. The method according to claim 18 , wherein the reference signal configuration for the UE includes an indication of sequence numbers of the selected downlink reference signals.

20. The method according to claim 19 , wherein a sequence number of one of the selected downlink reference signals is associated with a sequence number of one of the antenna ports.