Section: 5.2.2.3.2 Acquisition of an SI message
Content: For SI message acquisition PDCCH monitoring occasion(s) are determined according to searchSpaceOtherSystemInformation. If searchSpaceOtherSystemInformation is set to zero, PDCCH monitoring occasions for SI message reception in SI-window are same as PDCCH monitoring occasions for SIB1 where the mapping between PDCCH monitoring occasions and SSBs is specified in TS 38.213[ NR; Physical layer procedures for control ] [13]. If searchSpaceOtherSystemInformation is not set to zero, PDCCH monitoring occasions for SI message are determined based on search space indicated by searchSpaceOtherSystemInformation. PDCCH monitoring occasions for SI message which are not overlapping with UL symbols (determined according to tdd-UL-DL-ConfigurationCommon) are sequentially numbered from one in the SI window. The [x×N+K]th PDCCH monitoring occasion (s) for SI message in SI-window corresponds to the Kth transmitted SSB, where x = 0, 1, ...X-1, K = 1, 2, …N, N is the number of actual transmitted SSBs determined according to ssb-PositionsInBurst in SIB1 and X is equal to CEIL(number of PDCCH monitoring occasions in SI-window/N). The actual transmitted SSBs are sequentially numbered from one in ascending order of their SSB indexes. The UE assumes that, in the SI window, PDCCH for an SI message is transmitted in at least one PDCCH monitoring occasion corresponding to each transmitted SSB and thus the selection of SSB for the reception SI messages is up to UE implementation. When acquiring an SI message, the UE shall: 1> determine the start of the SI-window for the concerned SI message as follows: 2> if the concerned SI message is configured in the schedulingInfoList: 3> for the concerned SI message, determine the number n which corresponds to the order of entry in the list of SI messages configured by schedulingInfoList in si-SchedulingInfo in SIB1; 3> determine the integer value x = (n – 1) × w, where w is the si-WindowLength; 3> the SI-window starts at the slot #a, where a = x mod N, in the radio frame for which SFN mod T = FLOOR(x/N), where T is the si-Periodicity of the concerned SI message and N is the number of slots in a radio frame as specified in TS 38.213[ NR; Physical layer procedures for control ]  [13]; 2> else if the concerned SI message is configured in the schedulingInfoList2; 3> determine the integer value x = (si-WindowPosition -1) × w, where w is the si-WindowLength; 3> the SI-window starts at the slot #a, where a = x mod N, in the radio frame for which SFN mod T = FLOOR(x/N), where T is the si-Periodicity of the concerned SI message and N is the number of slots in a radio frame as specified in TS 38.213[ NR; Physical layer procedures for control ]  [13]; 2> else if the concerned SI message is configured in the posSchedulingInfoList and offsetToSI-Used is not configured: 3> create a concatenated list of SI messages by appending the posSchedulingInfoList in posSI-SchedulingInfo in SIB1 to schedulingInfoList in si-SchedulingInfo in SIB1; 3> for the concerned SI message, determine the number n which corresponds to the order of entry in the concatenated list; 3> determine the integer value x = (n – 1) × w, where w is the si-WindowLength; 3> the SI-window starts at the slot #a, where a = x mod N, in the radio frame for which SFN mod T = FLOOR(x/N), where T is the posSI-Periodicity of the concerned SI message and N is the number of slots in a radio frame as specified in TS 38.213[ NR; Physical layer procedures for control ]  [13]; 2> else if the concerned SI message is configured by the posSchedulingInfoList and offsetToSI-Used is configured: 3> determine the number m which corresponds to the number of SI messages with an associated si-Periodicity of 8 radio frames (80 ms), configured by schedulingInfoList in SIB1; 3> for the concerned SI message, determine the number n which corresponds to the order of entry in the list of SI messages configured by posSchedulingInfoList in SIB1; 3> determine the integer value x = m × w + (n – 1) × w, where w is the si-WindowLength; 3> the SI-window starts at the slot #a, where a = x mod N, in the radio frame for which SFN mod T = FLOOR(x/N) +8, where T is the posSI-Periodicity of the concerned SI message and N is the number of slots in a radio frame as specified in TS 38.213[ NR; Physical layer procedures for control ]  [13]; 1> receive the PDCCH containing the scheduling RNTI, i.e. SI-RNTI in the PDCCH monitoring occasion(s) for SI message acquisition, from the start of the SI-window and continue until the end of the SI-window whose absolute length in time is given by si-WindowLength, or until the SI message was received; 1> if the SI message was not received by the end of the SI-window, repeat reception at the next SI-window occasion for the concerned SI message in the current modification period; 1> if all the SIB(s) and/or posSIB(s) requested in DedicatedSIBRequest message have been acquired: 2> stop timer T350, if running; NOTE 1: The UE is only required to acquire broadcasted SI message if the UE can acquire it without disrupting unicast or MBS multicast data reception, i.e. the broadcast and unicast/MBS multicast beams are quasi co-located. NOTE 2: The UE is not required to monitor PDCCH monitoring occasion(s) corresponding to each transmitted SSB in SI-window. NOTE 3: If the concerned SI message was not received in the current modification period, handling of SI message acquisition is left to UE implementation. NOTE 4: A UE in RRC_CONNECTED may stop the PDCCH monitoring during the SI window for the concerned SI message when the requested SIB(s) are acquired. NOTE 5: A UE capable of NR sidelink communication/discovery and configured by upper layers to perform NR sidelink communication/discovery on a frequency, may acquire SIB12 or SystemInformationBlockType28 from a cell other than current serving cell (for RRC_INACTIVE or RRC_IDLE) or current PCell (for RRC_CONNECTED), if SIB12 of current serving cell (for RRC_INACTIVE or RRC_IDLE) or current PCell (for RRC_CONNECTED) does not provide configuration for NR sidelink communication/discovery for the frequency, and if the other cell providing configuration for NR sidelink communication/discovery for the frequency meets the S-criteria as defined in TS 38.304[ NR; User Equipment (UE) procedures in Idle mode and in RRC Inactive state ]  [20] or TS 36.304[ Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode ]  [27]. 1> perform the actions for the acquired SI message as specified in clause 5.2.2.4.