Electronic device, method and storage medium for wireless communication system

1. An electronic device for a terminal device in a wireless communication system, comprising processing circuitry configured to:

obtain random access (RA) configuration information of a base station (BS); and

transmit an RA preamble based on the RA configuration information, the RA preamble indicating plural transmit (TX) beams of the BS,

wherein the RA configuration information comprises a correspondence between beams at the BS and a plurality of RA occasions,

wherein the processing circuitry is further configured to transmit the RA preamble in a specific RA occasion of the plurality of RA occasions, and

wherein the specific RA occasion indicates identification information of one of the plural TX beams at the BS that is paired with the terminal device in downlink in accordance with a correlation of synchronization sequences.

2. The electronic device of claim 1 ,

wherein the RA preamble comprises a preamble sequence, and the preamble sequence per se corresponds to the plural TX beams at the BS, and

wherein a single transmission of the RA preamble at the specific RA occasion indicates the identification information of the one of the plural TX beams at the BS.

3. The electronic device of claim 1 , wherein the processing circuitry is further configured to obtain the RA configuration information from another BS via dual connectivity.

4. The electronic device of claim 3 , wherein, the BS is a New Radio (NR) base station and the another BS is a LTE base station, and the processing circuitry is configured to receive a Radio Resource Control (RRC) reconfiguration message from the LTE base station to obtain the RA configuration information of the NR base station.

5. The electronic device of claim 1 ,

wherein the beams at the BS comprise first level beams and second level beams, where the second level beams have a coverage that is narrower than a coverage of the first level beams,

wherein the correspondence between the beams at the BS and the plurality of RA occasions comprises a correspondence between the first and second level beams at the BS and the plurality of RA occasions, and

wherein the processing circuitry is further configured to indicate the one of the plural TX beams at the BS that is paired with the terminal device by an uplink message subsequent to the RA preamble.

6. The electronic device of claim 1 , wherein the processing circuitry is further configured to retransmit the RA preamble by firstly using a TX beam at the terminal device most related to a direction of a previous TX beam based on a relation in direction that comprises transmission directions adjacent to or at least partially overlapping with each other.

7. The electronic device of claim 1 ,

wherein the one of the plural TX beams at the BS that is paired with the terminal device is determined by the terminal device based on receiving of a synchronization signal (SS) block,

wherein the SS block comprises a primary SS (PSS), a secondary SS (SSS), and a Physical Broadcast Channel (PBCH), and

wherein the processing circuitry is further configured to receive a plurality of SS blocks transmitted by different TX beams of the plural TX beams at the base station within a period in time domain, and to use the different TX beams at the base station corresponding to SS blocks in which signal reception quality satisfies a predetermined condition as the one of the plural TX beams at the BS that is paired with the terminal device.

8. The electronic device of claim 7 ,

wherein the processing circuitry is further configured to determine, based on additional information bits in the SS block that satisfies the predetermined condition, the TX beam used to transmit the SS block by the base station.

9. The electronic device of claim 1 ,

wherein the electronic device is configured to operate as the terminal device via plural radio frequency links, each of the plural radio frequency links being coupled to a corresponding antenna of a plurality of antennas and corresponding phase shifters of the terminal device,

wherein the processing circuitry configures the phase shifters of the plurality of antennas based on a beam direction that match with the one of the plural TX beams at the base station, to cause the plurality of antennas to transmit the RA preamble to the base station by beamforming, and

wherein the wireless communication system is a fifth generation New Radio communication system and the base station is a gNB.

10. A method for wireless communication system, comprising:

obtaining random access (RA) configuration information of a base station (BS); and

transmitting an RA preamble based on the RA configuration information, the RA preamble indicating plural transmit (TX) beams of the BS,

wherein the RA configuration information comprises a correspondence between beams at the BS and a plurality of RA occasions,

wherein the RA preamble is transmitted in a specific RA occasion of the plurality of RA occasions, and

wherein the specific RA occasion indicates identification information of one of the plural TX beams at the BS that is paired with the terminal device in downlink in accordance with a correlation of synchronization sequences.

11. A non-transitory computer readable produce containing instructions to cause an electronic device for a terminal device in a wireless communication system to perform a method, the comprising:

obtaining random access (RA) configuration information of a base station (BS); and

transmitting an RA preamble based on the RA configuration information, the RA preamble indicating plural transmit (TX) beams of the BS,

wherein the RA configuration information comprises a correspondence between beams at the BS and a plurality of RA occasions,

wherein the RA preamble is transmitted in a specific RA occasion of the plurality of RA occasions, and

wherein the specific RA occasion indicates identification information of one of the plural TX beams at the BS that is paired with the terminal device in downlink in accordance with a correlation of synchronization sequences.

12. An electronic device for a base station (BS) in a wireless communication system, comprising processing circuitry configured to:

receive a random access (RA) preamble from a terminal device based on a RA configuration information of the BS, the RA preamble indicating plural transmit (TX) beams at the BS,

wherein the RA configuration information comprises a correspondence between beams at the BS and a plurality of RA occasions,

wherein the processing circuitry is further configured to receive the RA preamble in a specific RA occasion of the plurality of RA occasions and identify one of the plural TX beams at the BS that is paired with a downlink beam of the terminal device in accordance with a correlation of synchronization sequences, and

wherein the specific RA occasion indicates identification information of one of the plural TX beams at the BS that is paired with the terminal device in downlink.

13. The electronic device according to claim 12 , wherein the electronic device is implemented as a New Radio base station and serves the terminal device together with another base station via dual connectivity.

14. The electronic device according to claim 13 , wherein the processing circuitry is configured to receive a secondary node addition request from the another base station and provide the RA configuration information to the another base station.

15. A method performed by an electronic device for a base station (BS) in a wireless communication system, the method comprising:

receiving a random access (RA) preamble from a terminal device based on a RA configuration information of the BS, the RA preamble indicating plural transmit (TX) beams at the BS,

wherein the RA configuration information comprises a correspondence between beams at the BS and a plurality of RA occasions;

receiving the RA preamble in a specific RA occasion of the plurality of RA occasions and identify one of the plural TX beams at the BS that is paired with a downlink beam of the terminal device in accordance with a correlation of synchronization sequences, and

wherein the specific RA occasion indicates identification information of one of the plural TX beams at the BS that is paired with the terminal device in downlink; and

communicating with the terminal device based on the RA preamble.