System Information Block Type 2 in LTE

After initial cell synchronization process is completed, UE will read master information block which contains important information regarding downlink cell bandwidth, PHICH configuration and System frame number. Then UE can read System information block 1and System information block 2 to obtain useful information related to cell access, SIB scheduling and radio resource configuration

System information block 2 carries radio resource configuration information which is common for all UEs.

SIB2 information can be divided in following sub categories

• Random access channel (RACH) related parameters 
• Idle mode paging configurations 
• Uplink physical control channel (PUCCH) and shared channel (PUSCH) configurations 
• Uplink power control and Sounding reference signal configurations 
• Uplink carrier frequency / Bandwidth 
• Cell barring information 

Access class baring for emergency calls determine whether or not UE with AC 0 TO 9 should treat the cell as barred for emergency calls. The same rule is applicable to UE without a USIM (AC information is stored on the USIM).UE with AC 11 to 15 are able to make emergency calls unless the cell is both AC class is barred for emergency calls and AC class barred for mobile originating data call.

Access class barring for mobile originating (MO) signaling determine whether or not UE should treat the cell as barred when initiating MO signaling connection. UE with 0 to 9 generate the random number between 0 to 1 .if it is less than the barring factor then the cell is treated as not barred .UE with AC11 to 15 check the barring for special AC to determine whether or not it is necessary to generate a random number with which is compared against the barring factor.

If cell is treated as barred for MO signaling connection than the barring timer is used to define a penalty time during which the UE is not allowed to re-attempt to access.

The guard time is defind as   T305=(0.7 +0.6*RAND)

Important contents of SystemInformationBlockType2

sib2 {

ac_BarringInfo {

                           ac_BarringForEmergency = FALSE

                           ac_BarringForMO_Signalling {

                              ac_BarringFactor = p95

                              ac_BarringTime = s8

ac_BarringForSpecialAC = {5, 00000xxx }

                           }

                           ac_BarringForMO_Data {

                              ac_BarringFactor = p95

                              ac_BarringTime = s8

                              ac_BarringForSpecialAC = { 5, 00000xxx }

                           }

                        }

RadioResourceConfigCommon {

rach_ConfigCommon {

PreambleInfo {

                                 numberOfRA_Preambles = n52

PreamblesGroupAConfig {

                                    sizeOfRA_PreamblesGroupA = n44

MessageSizeGroupA = b56

MessagePowerOffsetGroupB = dB5

                                 }

                              }

PowerRampingParameters {

PowerRampingStep = dB2

PreambleInitialReceivedTargetPower = dBm-110

                              }

ra_SupervisionInfo {

PreambleTransMax = n5

                                 ra_ResponseWindowSize = sf10

                                 mac_ContentionResolutionTimer = sf48

                              }

                              maxHARQ_Msg3Tx = 8

                           }

 bcch_Config {

ModificationPeriodCoeff = n2

                           }

pcch_Config {

DefaultPagingCycle = rf32

                              nB = oneT

                           }

prach_Config {

RootSequenceIndex = 22

                              prach_ConfigInfo {

                                 prach_ConfigIndex = 3

HighSpeedFlag = FALSE

ZeroCorrelationZoneConfig = 1

                                 prach_FreqOffset = 0

                              }

                           }

pdsch_ConfigCommon {

ReferenceSignalPower = -10

                              p_b = 0

                           }

pusch_ConfigCommon {

                              pusch_ConfigBasic {

                                 n_SB = 2

HoppingMode = interSubFrame

                                 pusch_HoppingOffset = 1

                                 enable64QAM = TRUE

                              }

                              ul_ReferenceSignalsPUSCH {

                                 GroupHoppingEnabled = FALSE

                                 GroupAssignmentPUSCH = 0

                                 SequenceHoppingEnabled = FALSE

                                 cyclicShift = 0

                              }

                           }

 pucch_ConfigCommon {

                              deltaPUCCH_Shift = ds2

                              nRB_CQI = 4

                              nCS_AN = 0

                              n1PUCCH_AN = 20

                           }

soundingRS_UL_ConfigCommon {

                              Release

                           }

UplinkPowerControlCommon {

                              p0_NominalPUSCH = -75

                              Alpha = al08

                              p0_NominalPUCCH = -96

                              deltaFList_PUCCH {

                                 deltaF_PUCCH_Format1 = deltaF0

                                 deltaF_PUCCH_Format1b = deltaF3

                                 deltaF_PUCCH_Format2 = deltaF0

                                 deltaF_PUCCH_Format2a = deltaF0

                                 deltaF_PUCCH_Format2b = deltaF0

                              }

                              deltaPreambleMsg3 = 4

                           }

                           ul_CyclicPrefixLength = len1

uplinkPowerControlCommon_v1020 {

                              deltaF_PUCCH_Format3_r10 = deltaF-1

                              deltaF_PUCCH_Format1bCS_r10 = deltaF1

                           }

                        }

ue_TimersAndConstants {

                           t300 = ms2000

                           t301 = ms400

                           t310 = ms1000

                           n310 = n10

                           t311 = ms5000

                           n311 = n1

                        }

 freqInfo {

                           ul_Bandwidth = n100

                           AdditionalSpectrumEmission = 1

                        }

TimeAlignmentTimerCommon = infinity

ssac_BarringForMMTEL_Voice_r9 {

                           ac_BarringFactor = p05

                           ac_BarringTime = s8

                           ac_BarringForSpecialAC = {5, 00000xxx}

                        }

ssac_BarringForMMTEL_Video_r9 {

                           ac_BarringFactor = p05

                           ac_BarringTime = s8

                           ac_BarringForSpecialAC = {5, 00000xxx}

                        }

                     }

                  }