Method and device for transmitting SSB in an unlicensed spectrum

1. A method for transmitting a synchronization signal block (SSB) on an unlicensed spectrum, comprising:

determining, by a network device, that a first transmission opportunity (TXOP) on an unlicensed carrier includes K SSB positions capable of being used to transmit SSBs, where K is less than a number X of SSBs configured by the network device for transmission on the unlicensed carrier, and K and X are both positive integers; and

respectively transmitting, by the network device, K SSBs of the X SSBs at the corresponding K SSB positions within the first TXOP,

wherein the method further comprises:

transmitting, by the network device, remaining X-K SSBs of the X SSBs within a second TXOP after the first TXOP, wherein each of the X SSBs is transmitted at a candidate SSB position corresponding to the SSB, and different SSBs correspond to different candidate SSB positions, wherein a Listen Before Talk (LBT) interval is between the first TXOP and the second TXOP,

wherein transmitting, by the network device, the remaining X-K SSBs of the X SSBs within the second TXOP after the first TXOP comprises:

transmitting, by the network device, the remaining X-K SSBs from a (K+1)-th SSB within the second TXOP until the (K+1)-th SSB to an X-th SSB are sequentially transmitted,

wherein the network device no longer transmits the K SSBs already transmitted within the first TXOP at K SSB positions within the second TXOP that correspond to the K SSB positions within the first TXOP.

2. The method of claim 1 , wherein the first TXOP and the second TXOP are within a same Discovery Reference Signal (DRS) window.

3. The method of claim 1 , wherein the candidate SSB position corresponds to an SSB index.

4. A network device, comprising:

a memory storing processor-executable instructions;

a processor configured to execute the stored processor-executable instructions to determine that a first transmission opportunity (TXOP) on an unlicensed carrier includes K SSB positions capable of being used to transmit SSBs, where K is less than a number X of SSBs configured by the network device for transmission on the unlicensed carrier, and K and X are both positive integers; and

a transceiver configured to transmit K SSBs of the X SSBs at the corresponding K SSB positions within the first TXOP, wherein the transceiver is further configured to:

transmit remaining X-K SSBs of the X SSBs within a second TXOP after the first TXOP, wherein each of the X SSBs is transmitted at a candidate SSB position corresponding to the SSB, and different SSBs correspond to different candidate SSB positions, wherein a Listen Before Talk (LBT) interval is between the first TXOP and the second TXOP,

wherein the transceiver is specifically configured to:

transmit the remaining X-K SSBs from a (K+1)-th SSB within the second TXOP until the (K+1)-th SSB to an X-th SSB are sequentially transmitted,

wherein the network device no longer transmits the K SSBs already transmitted within the first TXOP at K SSB positions within the second TXOP that correspond to the K SSB positions within the first TXOP.

5. The network device of claim 4 , wherein the first TXOP and the second TXOP are within a same Discovery Reference Signal (DRS) window.

6. The network device of claim 4 , wherein the candidate SSB position corresponds to an SSB index.