可用于SIB1-BR传输的帧号和子帧号列表如下：
DL?15. Table 6.4.1-1: The set of frames and subframes for SIB1-BR for NRBSIB1-BRNPDSCH cellNIDmod2 4 0 1 Frame structure type 1 nfmod2 nsf 0 4 1 4 Frame structure type 2 nfmod2 nsf 1 5 1 5
DL?15. Table 6.4.1-2: The set of frames and subframes for SIB1-BR for NRBSIB1-BRNPDSCH cellNIDmod2 4 8 16 0 1 0 1 0 1 Frame structure type 1 nfmod2 nsf 0 4 1 4 0, 1 4 0, 1 9 0, 1 4, 9 0, 1 0, 9 Frame structure type 2 nfmod2 nsf 1 5 1 0 0, 1 5 0, 1 0 0, 1 0, 5 0, 1 0, 5
4.1.3.2SIB1-BR接收Narrowband描述
SIB1-BR传输的narrowband在整个系统带宽内跳频。跳频算法如下：
DL?15，则1. 设系统带宽内的所有narrowbands集合为?sj?，如果当前系统带宽NRBDL?sj?需要排除与中间72个子载波有重叠部分的narrowbands；以NRB=25为例，
本来有4个narrowbands，但中间2个narrowbands都和中间72个子载波有重叠，
S所以需要排除之。实际的?sj?集合是只包含两个narrowbands。NNB=2表示?sj?集
合的元素个数；
2. 对?sj?集合按照下述公式进行抽取和重排，得到集合?si?，?si?里面元素个数是m
个，小于或等于?sj?里面的元素个数：
nNB?sjcellSSSj?NIDmodNNB?i?NNBmmodNNB????i?0,1,...,m?1DL?1NRB?12?DLm??212?NRB?50?450?NDLRB?
DLN=25为例，?s?={n_NB_index = 0, n_NB_index = 3}；假定Ncell=7，则根RB同样以jID据上述公式重排之后的集合?si?={n_NB_index = 3, n_NB_index = 0}。n_NB_index表示的是对原小区带宽进行narrowband的编号结果。
3. SIB1-BR在80ms周期的每个子帧的传输narrowband从集合?si?里面循环获得，第
一个子帧选择?si?集合中i=0的narrowband，第2个子帧选择i=1的narrowband。
cellSIB1-BR以NPDSCH=8，NID=7，TDD， DL bandwidth = 10M为例，SIB1-BR所在子帧以及
narrowband编号如下图所示：
以
SIB1-BRNPDSCH=16，NcellID=6，FDD， DL bandwidth = 20M为例，SIB1-BR所在子帧以及
narrowband编号如下图所示：
上面示意图中，nNB表示的是原始系统带宽的narrowband编号。 4.1.3.3 关于SIB1-BR的其他说明
SIB1-BR的Nacc?1，表示SIB1-BR不支持数据解调前的合并；
Legacy UE在接收SIB1/SIBx时，都需要通过SI-RNTI检测PDCCH，然后再根据检测到的DCI安排PDSCH接收，得到SIB1/SIBx的内容；而BL/CE UE的SIB1-BR/SIBx接收不需要检测MPDCCH，没有SI-RNTI。
SIB1-BR/SIBx都是占用一个narrowband的所有6个RB。 SIB1-BR的发送安排在从lDataStart开始的符号上：
- -
DL?10for the cell on which PDSCH is received lDataStart?3ifNRBDL?10for the cell on which PDSCH is received lDataStart?4ifNRB SIB1-BR都固定使用QPSK调制；
如果一个子帧在某narrowband传输了SIB1-BR/SIBx，则在同一个子帧的同一个narrowband
上调度的PDSCH或者MPDCCH要丢弃。
4.1.3.4 SIB1-BR信息中包含的关于SIBx的调度信息
SystemInformationBlockType1-v1310-IEs ::= SEQUENCE { …… bandwidthReducedAccessRelatedInfo-r13 SEQUENCE { si-WindowLength-BR-r13 ENUMERATED { ms20, ms40, ms60, ms80, ms120, ms160, ms200, spare}, si-RepetitionPattern-r13 ENUMERATED {everyRF, every2ndRF, every4thRF, every8thRF}, schedulingInfoList-BR-r13 SchedulingInfoList-BR-r13 OPTIONAL, - Need OR fdd-DownlinkOrTddSubframeBitmapBR-r13 CHOICE { subframePattern10-r13 BIT STRING (SIZE (10)),
-
subframePattern40-r13 BIT STRING (SIZE (40)) } OPTIONAL, -- Need OP fdd-UplinkSubframeBitmapBR-r13 BIT STRING (SIZE (10)) OPTIONAL, -- Need OP startSymbolBR-r13 INTEGER (1..4), si-HoppingConfigCommon-r13 ENUMERATED {on,off}, si-ValidityTime-r13 ENUMERATED {true} OPTIONAL, -- Need OP systemInfoValueTagList-r13 SystemInfoValueTagList-r13 OPTIONAL -- Need OR } OPTIONAL, -- Cond BW-reduced nonCriticalExtension SystemInformationBlockType1-v1320-IEs OPTIONAL }
SystemInformationBlockType1-v1320-IEs ::= SEQUENCE { freqHoppingParametersDL-r13 SEQUENCE { mpdcch-pdsch-HoppingNB-r13 ENUMERATED {nb2, nb4} OPTIONAL, -- Need OR interval-DLHoppingConfigCommonModeA-r13 CHOICE { interval-FDD-r13 ENUMERATED {int1, int2, int4, int8}, interval-TDD-r13 ENUMERATED {int1, int5, int10, int20} } OPTIONAL, -- Need OR interval-DLHoppingConfigCommonModeB-r13 CHOICE { interval-FDD-r13 ENUMERATED {int2, int4, int8, int16}, interval-TDD-r13 ENUMERATED { int5, int10, int20, int40} } OPTIONAL, -- Need OR mpdcch-pdsch-HoppingOffset-r13 INTEGER (1..maxAvailNarrowBands-r13) OPTIONAL -- Need OR } OPTIONAL, -- Cond SI-Hopping nonCriticalExtension SEQUENCE {} OPTIONAL }
SchedulingInfo ::= SEQUENCE { si-Periodicity ENUMERATED { rf8, rf16, rf32, rf64, rf128, rf256, rf512}, sib-MappingInfo SIB-MappingInfo }
SchedulingInfoList-BR-r13 ::= SEQUENCE (SIZE (1..maxSI-Message)) OF SchedulingInfo-BR-r13
SchedulingInfo-BR-r13 ::= SEQUENCE { si-Narrowband-r13 INTEGER (1..maxAvailNarrowBands-r13), si-TBS-r13 ENUMERATED {b152, b208, b256, b328, b408, b504, b600, b712, b808, b936} }
fdd-DownlinkOrTddSubframeBitmapBR The set of valid subframes for FDD downlink or TDD transmissions, see TS 36.213 [23]. The set of valid subframes is a subset of non-MBSFN subframes indicated in mbsfn-SubframeConfigList . If the field is not present all subframes are considered as valid subframes for FDD downlink transmission and all DL subframes according to the uplink-downlink configuration (see TS 36.211) are considered as valid subframes for TDD DL transmission. If mbsfn-SubframeConfigList is indicated in SystemInformationBlockType2, the field is present. fdd-UplinkSubframeBitmapBR The set of valid subframes for FDD uplink transmissions for BL UEs, see TS 36.213 [23]. If the field is not present, then UE considers all uplink subframes as valid subframesfor FDD uplinktransmissions. si-HoppingConfigCommon Frequency hopping activation/deactivation for BR versions ofSI messages and MPDCCH of paging. si-Narrowband This field indicates the index of a narrowband used to broadcast the SI message towards low complexity UEs and UEs supporting CE, see TS 36.211 [21] and TS 36.213 [23]. si-Periodicity Periodicity of the SI-message in radio frames, such that rf8 denotes 8 radio frames, rf16 denotes 16 radio frames, and so on. si-TBS This field indicates the transport block size information used to broadcast the SI message towards low complexity UEs and UEs supporting CE, see TS 36.213 [23, Table 7.1.7.2.1-1] for a 6 PRB bandwidth and a QPSK modulation. schedulingInfoList-BR Indicates additional scheduling information of SI messages for BL UEs and UEs in CE. It includes the same number of entries, and listed in the same order, as in schedulingInfoList (without suffix). Comment: 对BL/CE , schedulingInfoList (without suffix)也是需要的 si-WindowLength, si-WindowLength-BR Common SI scheduling window for all SIs. Unit in milliseconds, where ms1 denotes 1 millisecond, ms2 denotes 2 milliseconds and so on. In case si-WindowLength-BR-r13 is present and the UE is a BL UE or a UE in CE, the UE shall use si-WindowLength-BR-r13 and ignore the original field si-WindowLength (without suffix). UEs other than BL UEs or UEs in CE shall ignore the extension field si-WindowLength-BR-r13. si-RepetitionPattern Indicates the radio frames within the SI window used for SI message transmission. Value everyRF corresponds to every radio frame, Value every2ndRF corresponds to every second radio frame, starting from the first radio frame of the SI window, and so on. startSymbolBR For BL UEs and UEs in CE, indicates the OFDM starting symbol for any MPDCCH, PDSCH scheduled on the same cell except the PDSCH carrying SystemInformationBlockType1-BR, see TS 36.213 [23]. Values 1, 2, and 3 are applicable for dl-Bandwidth greater than 10 resource blocks. Values 2, 3, and 4 are applicable otherwise. systemInfoValueTagList Indicates SI message specific value tags for BL UEs and UE in CE. It includes the same number of entries, and listed in the same order, as in SchedulingInfoList (without suffix). 4.1.4 SIBx
BL/CE UE的SIBx调度的时频信息完全在SIB1-BR里面指示，不需要通过检测SI-RNTI加扰的MPDCCH来获得调度。 SIBx固定使用QPSK调制；
4.1.4.1 SIBx接收时频资源描述
BL/CE SIBx调度子帧的计算和Legacy UE有类似的地方，也有一些特殊的配置，与SIBx调度相关的参数包括：
1. SI-window，是对所有SI message通用的一个参数，基站可配置；在SI-window内
需要根据si-RepetitionPattern决定哪些无线帧需要接收，根据fdd-DownlinkOrTddSubframeBitmapBR决定哪些子帧需要接收；这两个参数也都是所有SI message的通用参数；
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