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标题: NR SIB消息 [查看完整版帖子] [打印本页]

时间: 2021-1-4 17:53

作者: renjianliuyue 标题: NR SIB消息

1980 Jan  6  00:02:48.587  [76]  0xB821  NR5G RRC OTA Packet  --  BCCH_DL_SCH / SystemInformationBlockType1
Subscription ID = 1
Pkt Version = 9
RRC Release Number.Major.minor = 15.9.0
Radio Bearer ID = 0, Physical Cell ID = 28
Freq = 720288
Sfn = 899, SubFrameNum = 0
slot = 0
PDU Number = BCCH_DL_SCH Message, Msg Length = 111
SIB Mask in SI =  0x02

Interpreted PDU:

value BCCH-DL-SCH-Message ::=
{
  message c1 : systemInformationBlockType1 :
   {
      cellSelectionInfo  小区选择信息，UE将搜索最强的支持S标准，即小区搜索中的接收功率Srxlev> 0 dB且小区搜索中接收的信号质量Squal > 0 dB。LTE一般是测量RSRP
Srxlev = Qrxlevmeas （RSRP值）– (qRxLevMin + qRxLevMinOffset) – pCompensation
pCompensation=max(pMax（小区允许的UE最大发射功率） – puMax（UE能力支撑的最大发射功率）, 0) (dB)
      {
      q-RxLevMin -45, 最小接入电平值rsrp -45*2=-90dBm，范围为-70至-22，建议值为-64，即为-128dbm
      q-RxLevMinOffset 1,最低接收电平偏置，仅当UE驻留在VPLMN且周期性的搜索高于PLMN而触发的小区选择时，才使用本参数。范围为0-8，建议值为0。q-RxLevMinOffset=1*2=2dB
      q-QualMin -28, 最小接收信号质量，Squal = Qqualmeas（测量小区的RSRQ） – (qQualMin + qQualMinOffset)
      q-QualMinOffset 1  最小接收信号接收质量偏置值
      },
   cellAccessRelatedInfo
      {
      plmn-IdentityList
      {
         {
            plmn-IdentityList
            {
            {
               mcc
               {
                  4,
                  6,
                  0
               },
               mnc
               {
                  0,
                  0
               }
            }
            },
            trackingAreaCode '00000000 00000000 00000001'B,
            ranac 0,
            cellIdentity '00000000 00000000 00000000 10111110 1000'B,
            cellReservedForOperatorUse notReserved
         }
      }
      },
      connEstFailureControl
      {
      connEstFailCount n2,
      connEstFailOffsetValidity s30,
      connEstFailOffset 0
      },
      servingCellConfigCommon
      {
      downlinkConfigCommon
      {
         frequencyInfoDL
         {
            frequencyBandList
            {
            {
               freqBandIndicatorNR 79
            }
            },
            offsetToPointA 0,
            scs-SpecificCarrierList
            {
            {
               offsetToCarrier 0,
               subcarrierSpacing kHz30,
               carrierBandwidth 273
            }
            }
         },
         initialDownlinkBWP
         {
            genericParameters
            {
            locationAndBandwidth 1099,  RIV方式分配下行资源，表示PDSCH频域资源分配方式为type1，计算方法为275（275-273+1）+（275-1-0）
            subcarrierSpacing kHz30
            },
            pdcch-ConfigCommon setup :
            {
               controlResourceSetZero 4,
               commonControlResourceSet
               {
                  controlResourceSetId 1,
                  frequencyDomainResources '11111111 00000000 00000000 00000000 00000000 00000'B, 频域位置，1bit map代表6prb,所以这里代表6*8=48个rb 48*12=576个子载波即576个RES
一个CCE=6REG=72个RE，其中54个用于PDCCH,18个用于DMRS.PDCCH用的调制方式为QPSK
                  duration 1, pdcch占的符号数
                  cce-REG-MappingType nonInterleaved : NULL, CCE到REG的映射类型
                  precoderGranularity allContiguousRBs
               },
               searchSpaceZero 0,
               commonSearchSpaceList
               {
                  {
                  searchSpaceId 1,
                  controlResourceSetId 1,
                  monitoringSlotPeriodicityAndOffset sl1 : NULL,
                  monitoringSymbolsWithinSlot '10000000 000000'B,  pdcch的时域位置为14个符号中的第一个
                  nrofCandidates
                  {
                     aggregationLevel1 n0,
                     aggregationLevel2 n0,
                     aggregationLevel4 n1, CCE聚合等级，先在聚合等级为4的上面忙搜，搜不到再在聚合等级为8的上面进行搜索
                     aggregationLevel8 n1,
                     aggregationLevel16 n0
                  },
                  searchSpaceType common :
                     {
                        dci-Format0-0-AndFormat1-0
                        {
                        }
                     }
                  }
               },
               searchSpaceSIB1 0, sib1的搜索空间ID,corresponds to L1 parameter "rmsi-SearchSpace"
               searchSpaceOtherSystemInformation 1, 其他sib消息的搜索空间ID corresponds to L1 parameter "Osi-SearchSpace"
               pagingSearchSpace 1,
               ra-SearchSpace 1
            },
            pdsch-ConfigCommon setup :
            {
               pdsch-TimeDomainAllocationList
               {
                  {
                  k0 0, ###pdcch与pdsch在同一个slot
                  mappingType typeA,
                  startSymbolAndLength 67 通过下面的公式，算出pdsch的起始符号为2（前面PDCCH占用了2个符号），持续符号长度为12，
if (L-1) <= 7 then
SLIV = 14 x (L-1) + S
else
SLIV = 14 x (14-L+1) + (14-1-S), where 0 < L <= 14 - S  S = Start Symbol Index L = Number of Consecutive Symbols
                  }
               }
            }
         },
         bcch-Config
         {
            modificationPeriodCoeff n4
         },
         pcch-Config
         {
            defaultPagingCycle rf32,
            nAndPagingFrameOffset oneSixteenthT : 3,
            ns one,
            firstPDCCH-MonitoringOccasionOfPO sCS120KHZquarterT-SCS60KHZoneEighthT-SCS30KHZoneSixteenthT :
            {
               0
            }
         }
      },
      uplinkConfigCommon
      {
         frequencyInfoUL
         {
            scs-SpecificCarrierList
            {
            {
               offsetToCarrier 0,
               subcarrierSpacing kHz30,
               carrierBandwidth 273
            }
            },
            p-Max 23
         },
         initialUplinkBWP
         {
            genericParameters
            {
            locationAndBandwidth 1099,
            subcarrierSpacing kHz30
            },
            rach-ConfigCommon setup :
            {
               rach-ConfigGeneric
               {
                  prach-ConfigurationIndex 147, 用于传输随机接入前导码的可用prach时机集,通过查表，可以知道Preamble format及prach的周期，子帧号，开始符号，持续时间
                  msg1-FDM one, 用于频域资源计算,频域上映射了1个PRACH资源
                  msg1-FrequencyStart 0, 用于频域资源计算,此项会告诉你PRACH资源的起点距离initial BWP或当前active BWP起点的offset，此时你可以得到PRACH资源在BWP的相对位置
                  zeroCorrelationZoneConfig 5, 查表确认Ncs值，用于计算Cv，从而产生64 preamble
                  preambleReceivedTargetPower -60, 用于计算prach的目标发送功率，preambleReceivedTargetPower + DELTA_PREAMBLE(根据preamble格式，查表得出此值) + (PREAMBLE_POWER_RAMPING_COUNTER – 1) ×  PREAMBLE_POWER_RAMPING_STEPPrach 实际的prach发射功率计算公式为= min{Pcmax,Prach.target+PL}dbm,其中Prach.target就为preambleReceivedTargetPower，其中Pcmax为终端最大发射功率，如23dbm
                  preambleTransMax n6, 重传最大次数
                  powerRampingStep dB4,重传功率每次递增4
                  ra-ResponseWindow sl20 UE在这个时间窗口中去监听pdcch dci，此处代表120个slot
               },
               totalNumberOfRA-Preambles 63,
               ssb-perRACH-OccasionAndCB-PreamblesPerSSB one : n52, one 表示一个prach  occasion对应一个ssb,一个ssb对应52个基于竟争的preambles,映射关系为{SSB0:0-51}
               groupBconfigured
               {
                  ra-Msg3SizeGroupA b56,
                  messagePowerOffsetGroupB dB0,
                  numberOfRA-PreamblesGroupA 52
               },
               ra-ContentionResolutionTimer sf64, 竟争解决超时时间
               rsrp-ThresholdSSB 0,
               prach-RootSequenceIndex l139 : 4, 通过查38211-6.3.3.1-4找到I=4的值得到4对应的sequenece number,sequecense number通过循环移位，得到64个preamber序列
               msg1-SubcarrierSpacing kHz30,
               restrictedSetConfig unrestrictedSet
            },
            pusch-ConfigCommon setup :
            {
               pusch-TimeDomainAllocationList
               {
                  {
                  k2 2,
                  mappingType typeA,
                  startSymbolAndLength 55 通过下面的公式，算出pusch的起始符号为0（前面PDCCH占用了一个符号），持续符号长度为12，
if (L-1) <= 7 then
SLIV = 14 x (L-1) + S
else
SLIV = 14 x (14-L+1) + (14-1-S), where 0 < L <= 14 - S  S = Start Symbol Index L = Number of Consecutive Symbols
                  }
               },
               msg3-DeltaPreamble 6, 用户计算msg3的发射功率，rachpower+2*(msg3-DeltaPreamble)
               p0-NominalWithGrant 24  #P0 value for PUSCH with grant
            },
            pucch-ConfigCommon setup :
            {
               pucch-ResourceCommon 3, pucch索引通过查38.213.的表9.2.1-1可以得到pucch的format ，起始符号，符号长度
        prb offset 以及set of initail cs indexes
               pucch-GroupHopping disable,
               hoppingId 1,  用于生成产生crc shift
               p0-nominal 24 pucch的发射功率，单位dbm
            }
         },
         timeAlignmentTimerCommon infinity  TA超时时间，此处为不限制
      },
      n-TimingAdvanceOffset n25600,  用于计算TA所用（Nta+Nta,offset）*Tc Tc=0.509ns
      ssb-PositionsInBurst
      {
         inOneGroup '10000000'B 表示只有第一个ssb#0才用于传输
inOneGroup '10100100'B 表示ssb#0，ssb#2，ssb#5才用于传输
      },
      ssb-PeriodicityServingCell ms20,
      tdd-UL-DL-ConfigurationCommon
      {
         referenceSubcarrierSpacing kHz30,
         pattern1
         {
            dl-UL-TransmissionPeriodicity ms0p5,
            nrofDownlinkSlots 3,
            nrofDownlinkSymbols 8,
            nrofUplinkSlots 2,
            nrofUplinkSymbols 2,
            dl-UL-TransmissionPeriodicity-v1530 ms3
         },
         pattern2
         {
            dl-UL-TransmissionPeriodicity ms2,
            nrofDownlinkSlots 1,
            nrofDownlinkSymbols 8,
            nrofUplinkSlots 2,
            nrofUplinkSymbols 2
         }
      },
      ss-PBCH-BlockPower 17 ssb功率，用于计算Prach的发射功率路损计算PathLoss=ssb的功率-接收信号rsrp

   RA-RNTI = 1 + s_id + 14 × t_id + 14 × 80 × f_id + 14 × 80 × 8 × ul_carrier_id
      },
      ue-TimersAndConstants
      {
      t300 ms200,
      t301 ms200,
      t310 ms50,
      n310 n2,
      t311 ms3000,
      n311 n2,
      t319 ms200
      }
   }
}

Length:  147
Header:  93 00 21 B8 76 9B D5 0E 02 00 00 00
Payload: 09 00 00 00 0F 90 00 1C 00 A0 FD 0A
         00 00 0C EE C4 02 02 00 00 00 6F 00
         74 85 B2 1E 00 61 46 00 00 00 00 08
         00 00 00 05 F4 68 05 84 27 00 00 00
         01 88 30 22 59 BF D0 03 FE 00 00 00
         00 03 03 70 44 20 00 00 90 80 00 41
         06 84 04 32 90 EA 00 00 40 00 06 21
         AB 81 12 CD E9 26 00 16 38 EB F3 C0
         39 F0 10 42 4E 10 8D FF 15 CE 00 78
         BA 80 49 80 1C 00 88 04 06 01 00 30
         02 29 A2 49 24 80 00 00 00 00 00 00
         00 00 00

时间: 2024-5-14 17:44

作者: goodman995

good stuff, thanks for sharing.

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