Electronic device, wireless communication method and computer readable medium

1. An electronic device for wireless communication, comprising:

processing circuitry configured to generate a discovery reference signal (DRS) for an unlicensed band;

wherein the DRS contains a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a channel state information reference signal (CSI-RS),

wherein in frequency domain, the CSI-RS is full-bandwidth, and the PSS and the SSS only occupy a predetermined number of central subcarriers,

wherein the processing circuitry is further configured to control to respectively transmit the DRS block in different beam directions, and

wherein the DRS block contains information relating to a transmission beam index related to the different beam directions.

2. The electronic device according to claim 1 , wherein the PSS, the SSS and the CSI-RS constituting one DRS block occupy successive orthogonal frequency division multiplexing (OFDM) symbols.

3. The electronic device according to claim 1 , wherein the PSS, the SSS and the CSI-RS in the same DRS block are within the same time slot.

4. The electronic device according to claim 1 , wherein one DRS block has a length of at least four orthogonal frequency division multiplexing (OFDM) symbols.

5. The electronic device according to claim 1 , wherein in one DRS block, the PSS and the SSS are arranged before the CSI-RS.

6. The electronic device according to claim 1 , wherein one DRS block contains two successively arranged CSI-RSs.

7. The electronic device according to claim 1 , wherein a signal arrangement order in the DRS block comprises:

PSS, SSS, CSI-RS, CSI-RS;

PSS, CSI-RS, SSS, CSI-RS;

CSI-RS, PSS, SSS, CSI-RS;

PSS, CSI-RS, CSI-RS, SSS;

CSI-RS, PSS, CSI-RS, SSS;

CSI-RS, CSI-RS, PSS, SSS;

SSS, PSS, CSI-RS, CSI-RS;

SSS, CSI-RS, PSS, CSI-RS;

CSI-RS, SSS, PSS, CSI-RS;

SSS, CSI-RS, PSS;

CSI-RS, SSS, CSI-RS, PSS; or

CSI-RS, CSI-RS, SSS, PSS.

8. The electronic device according to claim 1 , wherein the processing circuitry is configured to generate a DRS burst composed of a predetermined number of DRS blocks, wherein the predetermined number is determined based on an operation frequency point.

9. The electronic device according to claim 8 , wherein for an operation frequency point in a frequency band less than 3 GHz, each DRS burst contains up to 4 DRS blocks; for an operation frequency point in a frequency band greater than 3 GHz and less than 6 GHz, each DRS burst contains up to 8 DRS blocks; for an operation frequency band in a frequency band greater than 6 GHz and less than 52.6 GHz, each DRS burst contains up to 64 DRS blocks.

10. The electronic device according to claim 1 ,

wherein the processing circuitry is further configured to control to transmit the DRS with a subcarrier spacing shorter than a subcarrier spacing corresponding to 15 kHz or

wherein the processing circuitry is configured to control to transmit the DRS with a subcarrier spacing corresponding to 120 kHz, 240 kHz or 480 kHz.

11. The electronic device according to claim 1 , wherein the processing circuitry is further configured to: when DRSs to be transmitted cannot be completely transmitted within a currently configured discovery measurement timing configuration (DMTC) window period, control to transmit the DRS using an extended DMTC window.

12. The electronic device according to claim 11 , wherein the processing circuitry is further configured to: control to notify a user equipment of a size of the extended DMTC window by a licensed frequency band.

13. The electronic device according to claim 1 , wherein the processing circuitry is further configured to control to:

transmit the DRS based on an omnidirectional channel energy detection;

transmit the DRS based on a directional channel energy detection; or

transmit the DRS based on a combination of an omnidirectional channel energy detection and a directional channel energy detection.

14. The electronic device according to claim 13 , wherein a manner of the combination of the omnidirectional channel energy detection and the directional channel energy detection comprises:

performing the omnidirectional channel energy detection, and directionally transmitting the DRS if it is detected that a target channel is idle;

if the omnidirectional channel energy detection indicates that the target channel is non-idle, performing the directional channel energy detection, directionally transmitting the DRS for a direction detected as being idle, and not transmitting the DRS for a direction detected as being non-idle.

15. The electronic device according to claim 1 , wherein the processing circuitry is further configured to control to transmit the DRS with a discovery measurement timing configuration (DMTC) period less than 40 ms.

16. A wireless communication method by a communication device having a processor, the method comprising:

generating a discovery reference signal (DRS) for an unlicensed band; and

transmitting the DRS with a subcarrier spacing higher than 15 kHz,

wherein the DRS contains a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a channel state information reference signal (CSI-RS), and

wherein in frequency domain, the CSI-RS is full-bandwidth, and the PSS and the SSS only occupy a predetermined number of central subcarriers,

wherein the method further comprises controlling to respectively transmit the DRS block in different beam directions, and

wherein the DRS block contains information relating to a transmission beam index related to the different beam directions.

17. A wireless communication method by a communication device having a processor, the method comprising:

generating a discovery reference signal (DRS) for an unlicensed band; and

transmitting the DRS based on a combination of an omnidirectional channel energy detection and a directional channel energy detection,

wherein a manner of the combination of the omnidirectional channel energy detection and the directional channel energy detection comprises:

performing the omnidirectional channel energy detection, and directionally transmitting the DRS if it is detected that a target channel is idle;

if the omnidirectional channel energy detection indicates that the target channel is non-idle, performing the directional channel energy detection, directionally transmitting the DRS for a direction detected as being idle, and not transmitting the DRS for a direction detected as being non-idle.

18. An electronic device for wireless communication, comprising:

processing circuitry configured to

generate a discovery reference signal (DRS) for an unlicensed band; and

transmit the DRS based on a combination of an omnidirectional channel energy detection and a directional channel energy detection,

wherein a manner of the combination of the omnidirectional channel energy detection and the directional channel energy detection comprises:

performing the omnidirectional channel energy detection, and directionally transmitting the DRS if it is detected that a target channel is idle;

if the omnidirectional channel energy detection indicates that the target channel is non-idle, performing the directional channel energy detection, directionally transmitting the DRS for a direction detected as being idle, and not transmitting the DRS for a direction detected as being non-idle.