CORESET0时频域资源位置

SSB块与CORESET0的时频域资源都有很大的灵活性，使用MIB中有限的bit位数"pdcch-ConfigSIB1"（4MSB+4LSB）来表示两者的关系，必须对两者的映射关系做一定约束，也就是协议38.213的table 13-1~13-10与table 13-11~13-15。

MIB ::=                             SEQUENCE {systemFrameNumber                   BIT STRING (SIZE (6)),subCarrierSpacingCommon             ENUMERATED {scs15or60, scs30or120},ssb-SubcarrierOffset                INTEGER (0..15),dmrs-TypeA-Position                 ENUMERATED {pos2, pos3},pdcch-ConfigSIB1                    PDCCH-ConfigSIB1,cellBarred                          ENUMERATED {barred, notBarred},intraFreqReselection                ENUMERATED {allowed, notAllowed},spare                               BIT STRING (SIZE (1))
}

PDCCH-ConfigSIB1 ::=                SEQUENCE {controlResourceSetZero              ControlResourceSetZero,searchSpaceZero                     SearchSpaceZero
}

ControlResourceSetZero ::=                  INTEGER (0..15)

SearchSpaceZero ::=                 INTEGER (0..15)

ControlResourceSetZero即为4bit MSB，index取值0-15，查38213表table 13-1~13-10可确定符号数、PRB offset等配置；

SearchSpaceZero即为4bit LSB,index取值0-15，查表table 13-11~13-15，可确定SFN、时隙索引、时域相关配置；

以{ssb,pdcch}scs is {30,30}kHZ为例

For operation without shared spectrum channel access, a UE assumes that the offset in Tables 13-1 through 13-10 is defined with respect to the SCS of the CORESET for Type0-PDCCH CSS set, provided by subCarrierSpacingCommon, from the smallest RB index of the CORESET for Type0-PDCCH CSS set to the smallest RB index of the common RB overlapping with the first RB of the corresponding SS/PBCH block. In Tables 13-7, 13-8, and 13-10 Kssb is defined in [4, TS 38.211].
For operation with shared spectrum channel access, a UE determines an offset from a smallest RB index of the CORESET for Type0-PDCCH CSS set to a smallest RB index of the common RB overlapping with a first RB of the corresponding SS/PBCH block.

通过Pdcch-configSIB1查表可确定CORESET0与searchspacezero的时频域位置，终端“盲检”PDCCH，接收RMSI（SIB1）

SIB1 ::=        SEQUENCE {cellSelectionInfo                   SEQUENCE {q-RxLevMin                          Q-RxLevMin,q-RxLevMinOffset                    INTEGER (1..8)                                              OPTIONAL,   -- Need Sq-RxLevMinSUL                       Q-RxLevMin                                                  OPTIONAL,   -- Need Rq-QualMin                           Q-QualMin                                                   OPTIONAL,   -- Need Sq-QualMinOffset                     INTEGER (1..8)                                              OPTIONAL    -- Need S}                                                                                                   OPTIONAL,   -- Cond StandalonecellAccessRelatedInfo               CellAccessRelatedInfo,connEstFailureControl               ConnEstFailureControl                                           OPTIONAL,   -- Need Rsi-SchedulingInfo                   SI-SchedulingInfo                                               OPTIONAL,   -- Need RservingCellConfigCommon             ServingCellConfigCommonSIB                                      OPTIONAL,   -- Need Rims-EmergencySupport                ENUMERATED {true}                                               OPTIONAL,   -- Need ReCallOverIMS-Support                ENUMERATED {true}                                               OPTIONAL,   -- Need Rue-TimersAndConstants               UE-TimersAndConstants                                           OPTIONAL,   -- Need Ruac-BarringInfo                     SEQUENCE {uac-BarringForCommon                UAC-BarringPerCatList                                           OPTIONAL,   -- Need Suac-BarringPerPLMN-List             UAC-BarringPerPLMN-List                                         OPTIONAL,   -- Need Suac-BarringInfoSetList              UAC-BarringInfoSetList,uac-AccessCategory1-SelectionAssistanceInfo CHOICE {plmnCommon                           UAC-AccessCategory1-SelectionAssistanceInfo,individualPLMNList                   SEQUENCE (SIZE (2..maxPLMN)) OF UAC-AccessCategory1-SelectionAssistanceInfo}                                                                                                   OPTIONAL    -- Need S}                                                                                                   OPTIONAL,   -- Need RuseFullResumeID                     ENUMERATED {true}                                               OPTIONAL,   -- Need RlateNonCriticalExtension            OCTET STRING                                                    OPTIONAL,nonCriticalExtension                SIB1-v1610-IEs                                                  OPTIONAL
}SIB1-v1610-IEs ::=               SEQUENCE {idleModeMeasurementsEUTRA-r16    ENUMERATED{true}                                                   OPTIONAL,  -- Need RidleModeMeasurementsNR-r16       ENUMERATED{true}                                                   OPTIONAL,  -- Need RposSI-SchedulingInfo-r16         PosSI-SchedulingInfo-r16                                           OPTIONAL,  -- Need RnonCriticalExtension             SEQUENCE {}                                                        OPTIONAL
}UAC-AccessCategory1-SelectionAssistanceInfo ::=    ENUMERATED {a, b, c}

ServingCellConfigCommonSIB ::=      SEQUENCE {downlinkConfigCommon                DownlinkConfigCommonSIB,uplinkConfigCommon                  UplinkConfigCommonSIB                                       OPTIONAL, -- Need RsupplementaryUplink                 UplinkConfigCommonSIB                                       OPTIONAL, -- Need Rn-TimingAdvanceOffset               ENUMERATED { n0, n25600, n39936 }                           OPTIONAL, -- Need Sssb-PositionsInBurst                SEQUENCE {inOneGroup                          BIT STRING (SIZE (8)),groupPresence                       BIT STRING (SIZE (8))                                   OPTIONAL  -- Cond FR2-Only},ssb-PeriodicityServingCell          ENUMERATED {ms5, ms10, ms20, ms40, ms80, ms160},tdd-UL-DL-ConfigurationCommon       TDD-UL-DL-ConfigCommon                                      OPTIONAL, -- Cond TDDss-PBCH-BlockPower                  INTEGER (-60..50),...,[[channelAccessMode-r16               CHOICE {dynamic                             NULL,semiStatic                          SemiStaticChannelAccessConfig}                                                                                               OPTIONAL, -- Cond SharedSpectrumdiscoveryBurstWindowLength-r16      ENUMERATED {ms0dot5, ms1, ms2, ms3, ms4, ms5}               OPTIONAL, -- Need RhighSpeedConfig-r16                 HighSpeedConfig-r16                                         OPTIONAL  -- Need R]]
}

DownlinkConfigCommonSIB ::=     SEQUENCE {frequencyInfoDL                 FrequencyInfoDL-SIB,initialDownlinkBWP              BWP-DownlinkCommon,bcch-Config                         BCCH-Config,pcch-Config                         PCCH-Config,...
}BCCH-Config ::=                 SEQUENCE {modificationPeriodCoeff         ENUMERATED {n2, n4, n8, n16},...
}PCCH-Config ::=             SEQUENCE {defaultPagingCycle                  PagingCycle,nAndPagingFrameOffset               CHOICE {oneT                                NULL,halfT                               INTEGER (0..1),quarterT                            INTEGER (0..3),oneEighthT                          INTEGER (0..7),oneSixteenthT                       INTEGER (0..15)},ns                                  ENUMERATED {four, two, one},firstPDCCH-MonitoringOccasionOfPO   CHOICE {sCS15KHZoneT                                                                SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..139),sCS30KHZoneT-SCS15KHZhalfT                                                  SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..279),sCS60KHZoneT-SCS30KHZhalfT-SCS15KHZquarterT                                 SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..559),sCS120KHZoneT-SCS60KHZhalfT-SCS30KHZquarterT-SCS15KHZoneEighthT             SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..1119),sCS120KHZhalfT-SCS60KHZquarterT-SCS30KHZoneEighthT-SCS15KHZoneSixteenthT    SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..2239),sCS120KHZquarterT-SCS60KHZoneEighthT-SCS30KHZoneSixteenthT                  SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..4479),sCS120KHZoneEighthT-SCS60KHZoneSixteenthT                                   SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..8959),sCS120KHZoneSixteenthT                                                      SEQUENCE (SIZE (1..maxPO-perPF)) OF INTEGER (0..17919)}      OPTIONAL,           -- Need R...,[[nrofPDCCH-MonitoringOccasionPerSSB-InPO-r16                                  INTEGER (2..4)             OPTIONAL  -- Cond SharedSpectrum2]]
}

FrequencyInfoDL-SIB ::=             SEQUENCE {frequencyBandList                   MultiFrequencyBandListNR-SIB,offsetToPointA                      INTEGER (0..2199),scs-SpecificCarrierList             SEQUENCE (SIZE (1..maxSCSs)) OF SCS-SpecificCarrier
}

通过SIB1可知offsetToPointA的值，计算可知PointA的值。拿大神图镇楼，侵删。
摘自自由之路66
添加链接描述

offset查表可得，from the smallest RB index of the CORESET0 to the smallest RB index of the common RB overlapping with the first RB of the corresponding SS/PBCH block.
OffsetToPointA,由基站侧SIB1配置，represents the frequency offset between point A and the lowest subcarrier of the lowest resource block，which has the subcarrier spacing provided by the higher-layer parameter subCarrierSpacingCommon and overlaps with the SS/PBCH block used by the UE for initial cell selection
Kssb，MIB配置

FR1, kSSB的范围{0，1，2…,23} , 需要5个bit来表示—MIB指示了4bit，剩余1bit在PBCH payload（共8bit）中，详见38.212 clause 7.1.1

FR2, kSSB的范围{0，1，2…,11}， 4bit 足以表示这个范围

NR PBCH内容

NR PBCH的载荷为56bit，24bit高层配置+32bit物理层提供的PBCH，详见下图

总结：

SSB盲检得到，初始小区接入，UE按20ms的周期检测；
PointA在SIB1中指示，解析流程为，SSB→PBCH→MIB→Kssb,Offset→Type0-PDCCH→SIB1；
MIB中的SFN与Kssb会出现结合PBCH附加比特计算的情况；

部分引自
5G NR SSB和CORESET0复用模式
NR PointA

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