The process of UE receiving control information

On the active DL BWP on each activated serving cell configured with PDCCH monitoring, the UE monitors a group of PDCCH candidates on one or more CORESETS according to the corresponding search space sets. The monitoring here refers to It tries to decode each PDCCH candidates using the monitored DCI formats.

For each DL BWP configured for the UE on the serving cell, the base station can configure up to 3 CORESETS for the UE. The base station uses signaling? PDCCH-Config/PDCCH-ConfigCommon IE: ControlResourceSet for each CORESET Provide the following information:

For CORESET 0, the UE believes that the DMRS port in the PDCCH received by the CORESET has a quasico-located relationship with the antenna port mentioned below:

One or more downlink reference signals configured by the TCI state indicated by the MACE CE activation command, or,

if there is no MAC CE activation after the most recent random access procedure command indicates a TCI state for this CORESET, then an SSB determined by the UE in the latest non-contention based random access process not initiated by PDCCH order has an accurate relationship with the DMRS port in the PDCCH received in CORESET 0. *Address relationship.

For CORESETs other than CORESET 0, if the base station provides the UE with a single TCI state for the CORESET or if the UE receives the MAC CE activation command (the command contains the configuration for the CORESET one of the TCI states), the UE considers that the DMRS port in the PDCCH received by the CORESET is the correct address of one or more downlink reference signals configured in the TCI state.

For each DL BWP configured for the UE in the serving cell, the base station can configure a search space set for the UE, and the base station provides the following search space sets for each search space set through signaling

Information:

In each serving cell, a UE can only monitor PDCCH candidates corresponding to DCI formats of four lengths in one search space set at most. The DCI formats of these four lengths can have at most The 3 lengths of DCI format are scrambled using C-RNTI.

The following table shows the maximum number of PDCCH candidates that a UE operating in a single serving cell can listen to on each slot in a DL BWP under SCS configuration:

If a UE:

Configured to operate on a single cell or to operate carrier aggregation on the same frequency band, and,

have the same or different QCL on the active DL BWP(s) of one or more cells- If the UE monitors PDCCH candidates on overlapping PDCCH monitoring occasions in multiple CORESETs of the TypeD attribute

, then the UE only monitors one CORESET in the active DL BWP(s) of one or more cells and in these multiple CORESETs. Monitor PDCCH on any CORESET that has the same QCL-TypeD attribute as the CORESET:

This CORESET corresponds to the cell with the smallest index (referring to the scenario where multiple cells are performing downlink scheduling at the same time, such as carrier The SS set with the smallest index in the aggregation), if the SS set is a CSS set, then the CORESET corresponds to the CSS set; otherwise, the CORESET corresponds to the USS set with the smallest index in the cell with the smallest index.

The USS set with the smallest index is selected from all USS sets with at least one PDCCH candidate in overlapping PDCCH monitoring occasions.

In order to determine CORESET: 1. Need to find an SS/PBCH block with different QCL-TypeD attributes from the CSI-RS; 2. The first one associated with an SSB in the first cell CSI-RS and the second CSI-RS associated with an SSB in the second cell, these two CSI-RS are considered to have the same QCL-TypeD attribute.

The allocation of non-overlapping CCEs and allocation of PDCCH candidates for PDCCH monitoring is based on the set of all search spaces associated with multiple CORESETS in the active DL BWP on one or more cells.

The number of active TCI states is determined by multiple CORESETS.

For a scheduled cell, at any time, a UE can only receive up to 16 signals in the format of DCI format 1_0 or 1_1 scrambled with C-RNTI, CS-RNTI or MCS-RNTI. PDCCH, these PDCCHs correspond to up to 16 PDSCHs that the UE has not received; a UE can only receive up to 16 PDCCHs in the format of DCI 0_0 or 0_1 scrambled with C-RNTI, CS-RNTI or MCS-RNTI. These PDCCHs Corresponds to up to 16 PUSCHs that have not been sent by the UE.

If a UE,

in a CORESET on an active DL BWP, the UE is configured to listen to the first PDCCH with DCI formats 0_0 and 1_0 in a CSS set candidate, and monitor the second PDCCH candidate with DCI formats 0_0 and 1_0 in a USS set, and,

The DCI format0_0/1_0 associated with the first PDCCH candidate is the same as the second PDCCH The DCI format0_0/1_0 associated with the candidate has the same length, and,

The UE receives the first PDCCH candidate and the second PDCCH candidate on the same set of CCEs, and,

The first PDCCH candidate and the second PDCCH candidate have the same scrambling code, and,

The DCI format0_0/1_0 of the first PDCCH candidate and the DCI format0_0/1_0 of the second PDCCH candidate are both represented by C-RNTI, or MCS-C-RNTI, or CS-RNTI scrambling.

Then the UE only decodes the DCI format0_0/1_0 related to the first PDCCH candidate.

/s/blog_3c3393b00102yr21.html