Method and device for performing wireless communication in unlicensed band
摘要
說明書
Hereinafter, a beam management method according to a change to the above-described NR-U SSB/CSI-RS transmission structure will be described. In NR, for beam management, a transmission configuration indicator (TCI) for indicating a beam between a reference RS and a target RS has been adopted.
This may mean a providing of beam pairing information for the reference signal (RS) used for data channel estimation and CSI estimation. Further, it may also be included whether beams are paired between the TRP and the UE. The quasi co-location (QCL) information used for inter-RS beam pairing should be known to the UE. Resultantly, the QCL type may mean the step of dividing the channel similarity between two RSs as follows.
The channel similarity related to the quasi co-location (QCL) type may be divided into {Doppler shift, Doppler spread, average delay, delay spread} in QCL Type A, {Doppler shift, Doppler spread} in QCL Type B, {average delay, Doppler shift} in QCL Type C, and {Spatial Rx parameter} in QCL Type D.
That is, NR has adopted L1-RSRP for beam estimation. As described above, L1-RSRP is performed via SSB and CSI-RS and, in NR-U, transmission of the two RSs is determined depending on whether LBT succeeds.
Thus, described below are a method for determining beam pairing depending on whether to transmit SSB/CSI-RS and a method for beam estimation by the UE when such NR-U beam management characteristics are taken into consideration. Although focusing on SSB, the following description may be applied to CSI-RS in substantially the same manner.
