Method and device for performing wireless communication in unlicensed band
摘要
說明書
Referring back to
That is, since in the unlicensed band, the base station performs an LBT operation upon actual SSB transmission and, after LBT succeeds, SSB transmission is performed, SSB transmission at the initially set time may not be guaranteed. Accordingly, information about the transmission interval for transmitting the SSB may be transmitted to the UE in the SSB burst set including the information about a change in the SSB transmission position due to LBT failure.
The transmission interval information may include SSB_index information at which LBT succeeds in the SSB burst set and SSB is actually transmitted. In this case, as an example, the arrangement of SSB indexes where the SSB is actually transmitted may be flexibly configured in multiple patterns, and a pattern selected by a predetermined criterion may apply. Or, as an example, the SSB_index where the SSB is actually transmitted may be indicated via RRC signaling or RMSI.
As another example, the transmission interval information for SSB transmission in the SSB burst set may include cyclic pattern information for transmitting the SSB, which has not been transmitted at the SSB_index where LBT failed, after the SSB transmitted at the SSB index where LBT succeeds, in the SSB burst set. For example, it is assumed that the SSB transmission positions set via higher layer signaling are SSB_index #0 to #3. Where LBT succeeds at SSB_index #2, consecutive transmission of SSBs may be performed at SSB_index #2 to #5.
