Electronic device, method and storage medium for wireless communication system
The present disclosure relates to electronic devices, methods, and storage medium for a wireless communication system. Various embodiments are described with respect to beam management. In one embodiment, an electronic device for a base station side in a wireless communication system can comprise a processing circuitry configured to repetitively transmit a synchronization signal (SS) to a terminal device by using different transmit (TX) beams based on a TX beam configuration; the SS can indicate information of the TX beam used to transmit the SS. The processing circuitry can be configured to obtain feedback from the terminal device; the feedback can comprise information of the TX beam for being used in TX beam management.
1. An electronic device for a terminal device side in a wireless communication system, comprising a processing circuitry configured to:
receive, from a Base Station (BS) in the wireless communication system, a plurality of Synchronization Signal (SS) blocks,
wherein the plurality of SS blocks are transmitted by different transmit (TX) beams at the BS side, and each SS block of the plurality of SS blocks indicates information of a TX beam used by the BS to transmit the SS block;
determine a SS block of the plurality of SS blocks that matches with the terminal device based on a corresponding SS block signal reception quality satisfying a predetermined condition; and
transmit a random access preamble to the base station to perform a random access process,
wherein the random access preamble indicates the information of the TX beam used by the BS to transmit the matching SS block,
wherein a random access time window associated with the random access preamble either independently indicates the information of the TX beam used by the BS to transmit the matching SS block, or indicates information of another TX beam, different from the TX beam, that is used by the BS to transmit the matching SS block,
wherein each SS block of the plurality of SS blocks includes a corresponding Zadoff-Chu sequence, and
wherein a correspondence exists between each SS block of the plurality of SS blocks and a TX beam of a plurality of TX beams of the BS, the correspondence comprising:
a correspondence between a first Zadoff-Chu sequence and a first TX beam of the plurality of TX beams of the BS; and
a correspondence between a second Zadoff-Chu sequence and a second TX beam of the plurality of TX beams of the BS.
2. The electronic device of claim 1 , wherein the processing circuitry is configured to:
obtain services of the BS and another base station that does not perform beamforming transceiving by way of dual connectivity, and
obtain information of the random access preamble indicating the TX beam used by the BS to transmit the matching SS block, from the another base station.
3. The electronic device of claim 2 , wherein the processing circuitry is further configured to:
obtain, from the another base station, information about a correspondence between each of a plurality of receive (RX) beams at the BS side and time domain resources to be used for transmitting random access preambles, including the random access preamble indicating the information of the TX beam used by the BS to transmit the matching SS block, and
determine the random access preamble indicating the TX beam used to transmit the matching SS block.
4. The electronic device of claim 1 , wherein the random access preamble includes a plurality of preamble sequences that are divided into multiple groups, and all of the preamble sequences in each of the multiple groups are used to indicate the information of the TX beam for a corresponding SS block.
5. The electronic device of claim 4 , wherein transmissions using all of the preamble sequences in each of the multiple groups are multiplexed by time.
6. The electronic device of claim 1 ,
wherein the SS block indicates, by a reference signal sequence per se in the SS block, the information of the TX beam used by the BS to transmit the SS block, or
wherein the SS block further comprises additional information bits by which to indicate additional information of the TX beam used by the BS to transmit the SS block.
7. The electronic device of claim 1 , wherein the processing circuitry is further configured to:
receive, from the BS, a radio resource control signal that includes random access configuration information that comprises a correspondence between beams at the BS side and a plurality of random access occasions; and
select a specific random access occasion to transmit a random access preamble according to the random access configuration information, to indicate the information of the TX beam used by the BS to transmit the matching SS block.
8. The electronic device of claim 1 , wherein the processing circuitry is further configured to receive:
a channel state information-reference signal (CSI-RS) beam transmitted by the BS in a TX beam direction corresponding to the matching SS block, and
feedback information of the CSI-RS beam matching with the terminal device to the BS.
9. An electronic device for a Base Station (BS) side in a wireless communication system, comprising a processing circuitry configured to:
transmit, by using a plurality of transmit (TX) beams, a plurality of synchronization signal (SS) blocks to a terminal device in the wireless communication system for downlink synchronization,
wherein each SS block of the plurality of SS blocks includes, respectively, a primary SS (PSS), a secondary SS (SSS), and a PBCH, and
wherein each SS block of the plurality of SS blocks indicates information of a TX beam used by the BS to transmit the SS block;
receive a random access preamble from the terminal device to perform a random access process,
wherein the random access preamble indicates the information of the TX beam used by the BS to transmit a SS block of the plurality of SS blocks that matches with the terminal device, and
wherein a random access time window associated with the random access preamble either independently indicates the information of the TX beam used by the BS to transmit the matching SS block, or indicates information of another TX beam, different from the TX beam, that is used by the BS to transmit the matching SS block; and
determine, according to at least one of the random access time window or the random access preamble, a TX beam at the BS side for downlink transmission to the terminal device,
wherein each SS block of the plurality of SS blocks includes a corresponding Zadoff-Chu sequence, and
wherein a correspondence exists between each SS block of the plurality of SS blocks and a TX beam of the plurality of TX beams of the BS, the correspondence comprising:
a correspondence between a first Zadoff-Chu sequence and a first TX beam of the plurality of TX beams of the BS; and
a correspondence between a second Zadoff-Chu sequence and a second TX beam of the plurality of TX beams of the BS.
10. The electronic device of claim 9 , wherein the processing circuitry is configured to:
provide information of the random access preamble indicating the TX beam used to transmit the matching SS block, to another base station that serves the terminal device together with the BS by way of dual connectivity and does not perform beamforming transceiving,
wherein the information of the random access preamble is transmitted to the terminal device by the another base station.
11. The electronic device of claim 10 , wherein the terminal device is further configured to:
obtain, from the another base station, information about correspondence between each of receive (RX) beams at the BS side and time domain resources to be used for transmitting random access preambles, including the random access preamble indicating the information of the TX beam used by the BS to transmit the matching SS block, and determine the random access preamble indicating the TX beam used to transmit the matching SS block.
12. The electronic device of claim 9 , wherein the random access preamble includes a plurality of preamble sequences that are divided into multiple groups, and all of the preamble sequences in each of the multiple groups are used to indicate the information of the TX beam for a same SS block.
13. The electronic device of claim 12 , wherein transmissions using all of the preamble sequences in each of the multiple groups are multiplexed by time.
14. The electronic device of claim 9 ,
wherein the SS block indicates, by a reference signal sequence per se in the SS block, the information of the TX beam used by the BS to transmit the SS block, or
wherein the SS block further comprises additional information bits by which to indicate additional information of the TX beam used by the BS to transmit the SS block.
15. The electronic device of claim 9 ,
wherein the processing circuitry is further configured to transmit, to the terminal device, a radio resource control signaling including random access configuration information that comprises a correspondence between beams at the BS side and a plurality of random access occasions, so that the terminal device selects, according to the random access configuration information, a specific random access occasion to transmit a random access preamble to indicate the information of the TX beam used by the BS to transmit the matching SS block.
16. The electronic device of claim 9 , wherein the processing circuitry is further configured to:
transmit a channel state information-reference signal (CSI-RS) beam in a TX beam direction corresponding to the matching SS block, and
receive, from the terminal device, feedback of information of the CSI-RS beam that matches with the terminal device.
17. A method for a Base Station (BS) side in a wireless communication system, the method comprising:
transmitting, by using a plurality of transmit (TX) beams, a plurality of synchronization signal (SS) blocks to a terminal device in the wireless communication system for downlink synchronization,
wherein each SS block of the plurality of SS blocks includes, respectively, a primary SS (PSS), a secondary SS (SSS), and a PBCH, and
wherein each SS block of the plurality of SS blocks indicates information of a TX beam used by the BS to transmit the SS block;
receiving a random access preamble from the terminal device to perform a random access process,
wherein the random access preamble indicates the information of the TX beam used by the BS to transmit a SS block of the plurality of SS blocks that matches with the terminal device,
wherein a random access time window associated with the random access preamble either independently indicates the information of the TX beam used by the BS to transmit the matching SS block, or indicates information of another TX beam, different from the TX beam, that is used by the BS to transmit the matching SS block; and
determining, according to the random access preamble, a TX beam at the BS side for downlink transmission to the terminal device,
wherein each SS block of the plurality of SS blocks includes a corresponding Zadoff-Chu sequence, and
wherein a correspondence exists between each SS block of the plurality of SS blocks and a TX beam of the plurality of TX beams of the BS, the correspondence comprising:
a correspondence between a first Zadoff-Chu sequence and a first TX beam of the plurality of TX beams of the BS; and
a correspondence between a second Zadoff-Chu sequence and a second TX beam of the plurality of TX beams of the BS.
18. The method of claim 17 , further comprising:
providing information of the random access preamble indicating the TX beam used to transmit the matching SS block, to another base station that serves the terminal device together with the BS by way of dual connectivity and does not perform beamforming transceiving,
wherein the information of the random access preamble is transmitted to the terminal device by the another base station.
19. The method of claim 17 , wherein the random access preamble includes a plurality of preamble sequences that are divided into multiple groups, and all of the preamble sequences in each of the multiple groups are used to indicate the information of the TX beam for a same SS block.
20. The method of claim 19 , wherein transmissions using all of the preamble sequences in each of the multiple groups are multiplexed by time.
21. The method of claim 17 ,
wherein the SS block indicates, by a reference signal sequence per se in the SS block, the information of the TX beam used by the BS to transmit the SS block, or
wherein the SS block further comprises additional information bits by which to indicate additional information of the TX beam used by the BS to transmit the SS block.