Section: 6.4.1 Physical downlink shared channel for BL/CE UEs
Content: For BL/CE UEs, the following additions and exceptions hold in addition to those in clause 6.4: - The maximum number of allocatable PRBs for PDSCH is restricted as follows: - If the PDSCH is associated with C-RNTI or SPS C-RNTI and the higher layer parameter ce-pdsch-maxBandwidth-config is set, - if the higher layer parameter ce-pdsch-maxBandwidth-config is set to 20 MHz, the maximum number of allocatable PRBs for PDSCH is 96 PRBs restricted to the narrowbands defined in clause 6.2.7; - if the higher layer parameter ce-pdsch-maxBandwidth-config is set to 5 MHz, the maximum number of allocatable PRBs for PDSCH is 24 PRBs restricted to no more than four of the narrowbands defined in clause 6.2.7. - If the PDSCH is associated with G-RNTI and the higher layer parameter pdsch-MaxBandwidth-SC-MTCH is set to 24 PRBs, the maximum number of allocatable PRBs for PDSCH is 24 PRBs restricted to no more than four of the narrowbands defined in clause 6.2.7. - For all other cases, the maximum number of allocatable PRBs for PDSCH is 6 PRBs restricted to one of the narrowbands defined in clause 6.2.7. - Resource elements occupied by CSI reference signals shall be counted in the PDSCH mapping but not used for transmission of the PDSCH. - Resource elements belonging to synchronization signals, the core part of PBCH, PBCH repetitions, or resource elements reserved for reference signals in the mapping operation of PBCH but not used for transmission of reference signals, shall be counted in the PDSCH mapping but not used for transmission of the PDSCH. - PRB pairs occupied by RSS shall be counted in the PDSCH mapping but not used for transmission of the PDSCH. - For BL/CE UEs in CEModeB configured in transmission mode 9, in MBSFN subframe(s), resource elements that correspond to the positions of cell-specific reference signals as in subframe #0 shall not be counted in the PDSCH mapping and not used for transmission of the PDSCH. - Resource elements belonging to PRBs in which PRS is transmitted (including PRS muted subframes) shall be counted in the PDSCH mapping but not used for transmission of the PDSCH. - If the higher layer parameter ce-punctured-subcarriers-DL is configured, and the DCI associated with the PDSCH uses C-RNTI or SPS C-RNTI, and transmit diversity according to clause 6.3.4.3 is used, - In the mapping to resource elements, when the complex-valued symbols and , where is an even number, are mapped to resource elements and in the same OFDM symbol with , then if ce-punctured-subcarriers-DL indicates that any of and shall be counted but not used for transmission, the UE shall assume that both and are counted but not used for transmission. - If PDSCH transmission in the LTE control region is configured by higher layer parameter transmissionInControlChRegion, after the initial mapping of the PDSCH to resource elements starting from in the first slot to the last OFDM symbol available for downlink transmission in the subframe has been performed, the mapping shall continue with resource elements not reserved for cell-specific reference signals in increasing order of first the index over the assigned physical resource blocks and then the index starting from in the first slot to in the first slot, where is given by clause 7.1.6.4 of TS 36.213[ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures ]  [4]. For BL/CE UEs, if the PDSCH is not carrying SIB1-BR the PRB resources for PDSCH transmission in the first subframe are obtained from the DCI as described in clauses 5.3.3.1.12, 5.3.3.1.13, and 5.5.1.3.14 in [3], or provided by higher layers. Each of the PDSCH codewords is transmitted with repetitions, where is the number of transport blocks defined in clause 7.1.11 of TS 36.213[ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures ]  [4]. The PDSCH transmission spans consecutive subframes, including subframes that are not BL/CE DL subframes where the PDSCH transmission is postponed. - If downlink resource reservation is enabled for the UE as specified in [9], and the Resource reservation field in the DCI is set to 1, then in case of PDSCH transmission associated with C-RNTI or SPS C-RNTI using UE-specific MPDCCH search space including PDSCH transmission without a corresponding MPDCCH, - In a subframe that is fully reserved as defined in clause 7.1 in [4], the PDSCH transmission is postponed until the next BL/CE downlink subframe that is not fully reserved. - In a subframe that is partially reserved, the reserved resource elements shall be counted in the PDSCH mapping but not used for transmission of the PDSCH. - If frequency hopping is not enabled for PDSCH, all PDSCH repetitions are located at the same PRB resources, and - if frequency hopping is enabled for PDSCH, the PDSCH shall be transmitted in subframe within the consecutive downlink subframes using the PRB resources of the narrowband with the same RIV as that of narrowband . The narrowband is defined as where is the absolute subframe number of the first downlink subframe intended for PDSCH and , and are cell-specific higher-layer parameters. For PDSCH carrying SI other than SIB1-BR and for PDSCH associated with P-RNTI, if interval-DlHoppingConfigCommonModeB is signalled in SIB1-BR, then the frequency hopping granularity is set to interval-DlHoppingConfigCommonModeB; otherwise, is set to interval-DlHoppingConfigCommonModeA signalled in SIB1-BR. For BL/CE UE in CEModeA, frequency hopping of PDSCH associated with C-RNTI or SPS C-RNTI is enabled when higher layer parameter mpdcch-pdsch-HoppingConfig is set and the frequency hopping flag in DCI format 6-1A indicates frequency hopping, otherwise, frequency hopping of is not enabled. For BL/CE UE in CEModeB, frequency hopping of PDSCH associated with C-RNTI or SPS C-RNTI is enabled when higher layer parameter mpdcch-pdsch-HoppingConfig is set, otherwise, frequency hopping of is not enabled. The UE shall not expect PDSCH in subframe if it is not a BL/CE DL subframe. For BL/CE UEs, if the PDSCH carries SIB1-BR, the PDSCH transmission is repeated periodically in every period of 8 radio frames, where a period starts with a radio frame with where is the system frame number. The PDSCH is transmitted times in each period of 8 frames, Let be the set of narrowbands, excluding narrowbands overlapping with the 72 center subcarriers for , and ordered in increasing order of narrowband index. The PDSCH transmission cycles through the set of narrowbands in increasing order of , starting with for the first subframe, according to where is the number of narrowbands in the set . The set of frames and subframes used for SIB1-BR transmission in each period are given by Tables 6.4.1-1 and 6.4.1-2. Table 6.4.1-1: The set of frames and subframes for SIB1-BR for . Table 6.4.1-2: The set of frames and subframes for SIB1-BR for . BL/CE UEs may assume the same precoding matrix being used for a PRB across a block of consecutive subframes when UE-specific reference signals are transmitted together with the PDSCH, where the subframe number of the first subframe in each block of consecutive subframes, denoted as , satisfies . For PDSCH transmission associated with SI-RNTI or P-RNTI to BL/CE UEs, frequency hopping of the PDSCH is enabled when higher layer parameter si-HoppingConfigCommon is set. For PDSCH transmission associated with PUR-RNTI to BL/CE UEs using UE-specific MPDCCH search space, frequency hopping of the PDSCH is enabled when higher layer parameter pur-PDSCH-FreqHopping is set. For PDSCH transmission associated with RA-RNTI or temporary C-RNTI to BL/CE UEs, frequency hopping of the PDSCH is enabled when higher layer parameter rar-HoppingConfig is set. Further - if PRACH CE level 0 or 1 is used for the last PRACH attempt, is set to the higher layer parameter interval-DlHoppingConfigCommonModeA; - if PRACH CE level 2 or 3 is used for the last PRACH attempt, is set to the higher layer parameter interval-DlHoppingConfigCommonModeB. For PDSCH transmission associated with SC-RNTI to BL/CE UEs, frequency hopping of the PDSCH is enabled when higher layer parameter mpdcch-pdsch-HoppingConfig-SC-MCCH is set. Further - if mpdcch-pdsch-HoppingConfig-SC-MCCH is set to CEModeA, is set to the higher layer parameter interval-DlHoppingConfigCommonModeA; - if mpdcch-pdsch-HoppingConfig-SC-MCCH is set to CEModeB, is set to the higher layer parameter interval-DlHoppingConfigCommonModeB. For PDSCH transmission associated with G-RNTI to BL/CE UEs, - if the higher layer parameter mpdcch-pdsch-CEmodeConfig-SC-MTCH is set to CEModeA, - if the higher layer parameter mpdcch-pdsch-HoppingConfig-SC-MTCH is set and the frequency hopping flag in DCI format 6-1A indicates frequency hopping, then frequency hopping of the PDSCH is enabled and is set to the higher layer parameter interval-DlHoppingConfigCommonModeA, otherwise frequency hopping is not enabled; - if the higher layer parameter mpdcch-pdsch-CEmodeConfig-SC-MTCH is set to CEModeB, - if the higher layer parameter mpdcch-pdsch-HoppingConfig-SC-MTCH is set, then frequency hopping of the PDSCH is enabled and is set to the higher layer parameter interval-DlHoppingConfigCommonModeB, otherwise frequency hopping is not enabled.