US10680779B2 Claim 10 vs 3GPP TS 38.213: Sample Claim Chart

The claimed activity is the UE acquiring a CORESET: upon detecting an SS/PBCH block the UE determines from the MIB that a CORESET for the Type0-PDCCH CSS set is present, and clause 13 then describes how that CORESET is determined.

The UE determines the CORESET parameters during cell search, using what the MIB carries. Upon receiving the MIB the UE applies the received pdcch-ConfigSIB1, which is the configuration information for the CORESET. The gNB is the sending end: the MIB is defined as Direction: Network to UE and is periodically broadcast on BCH. The MIB is the container; the pdcch-ConfigSIB1 field inside it is the configuration information. This holds where the MIB provides a CORESET for the Type0-PDCCH CSS set (the UE determines from the MIB whether one is present).

The configuration information is the pdcch-ConfigSIB1 field of the MIB, which determines a common ControlResourceSet (CORESET), a common search space and necessary PDCCH parameters. Time position information is controlResourceSetZero in pdcch-ConfigSIB1: the UE determines the number of consecutive symbols for the CORESET from it, as described in Tables 13-1 through 13-10. The CORESET is the one the UE determines from the MIB for the Type0-PDCCH CSS set. Position information is searchSpaceZero in pdcch-ConfigSIB1: the UE determines the PDCCH monitoring occasions from it, and the slot is located in a frame with a given SFN. The system frame number is carried by the systemFrameNumber field of the MIB (the 6 most significant bits of the 10-bit System Frame Number) and applied on reception. Reading: controlResourceSetZero is an index into Tables 13-1 to 13-10 that fixes the number of symbols, and pdcch-ConfigSIB1 is the container that also carries searchSpaceZero; searchSpaceZero fixes the frame (SFN) and slot of the monitoring occasions rather than a stated position of the CORESET itself. This holds where the MIB provides a CORESET for the Type0-PDCCH CSS set.

The time position information is controlResourceSetZero. First form: the number of symbols is the number of consecutive symbols that the UE determines for the CORESET of the Type0-PDCCH CSS set. A CORESET consists of N_RB^CORESET resource blocks in the frequency domain and N_symb^CORESET symbols in the time domain, N_symb^CORESET ∈ {1,2,3}. Second form: the start position is the first symbol index; the index for the first symbol of the CORESET is the first symbol index provided by Tables 13-11 and 13-12. Reading: in the second form the start position is provided through searchSpaceZero (Tables 13-11 and 13-12), not through controlResourceSetZero, which carries the number of symbols; the first form (the number of symbols alone) carries the row.

The symbols of the CORESET are its symbols in the time domain (N_symb^CORESET ∈ {1,2,3}), and they have normal cyclic prefix. The numerology used by the CORESET is given by subCarrierSpacingCommon: the SCS of the CORESET is the one provided by subCarrierSpacingCommon, and a numerology is obtained from the subcarrier spacing and the cyclic prefix (TS 38.211 §4.2). The CORESET is the one determined from the MIB for the Type0-PDCCH CSS set. Reading: the numerology is read on subCarrierSpacingCommon, the subcarrier-spacing part of the numerology; the cyclic-prefix part is the normal cyclic prefix of the CORESET symbols.

The UE selects the start position: a UE monitors PDCCH in the Type0-PDCCH CSS set starting from a slot, and the index for the first symbol of the CORESET in those slots is the first symbol index provided by Tables 13-11 and 13-12. The CORESET is the one determined from the MIB for the Type0-PDCCH CSS set. The selection rests on the received pdcch-ConfigSIB1, which the UE applies on receiving the MIB. The number of symbols is the number of consecutive symbols determined for the CORESET. The preset table is Table 13-11 (Table 13-12 is its FR2 counterpart), the fixed table of the standard that gives the first symbol index. Reading: in Table 13-11 the first symbol index of indices 1, 3, 5 and 7 is 0 for even i and N_symb^CORESET for odd i, so the start position follows from the number of symbols; the other entries are fixed values. The selecting step is read on the sentence whose subject is the UE (it monitors from a starting slot) together with the first-symbol-index sentence, which has no subject of its own.