Section 1.6 SIB5

• Introduction
• SIB5 Information element
• SIB5 message

Introduction

• SIB5仅包含LTE异频小区重选相关的信息
• SIB5包含普通的频率小区重选参数以及特定的小区重选参数

SIB5 Information element

SystemInformationBlockType5 ::= SEQUENCE {
   interFreqCarrierFreqList InterFreqCarrierFreqList,
   ...,
   lateNonCriticalExtension OCTET STRING (CONTAINING SystemInformationBlockType5-v8h0-IEs) OPTIONAL,
   [[ interFreqCarrierFreqList-v1250 InterFreqCarrierFreqList-v1250 OPTIONAL, -- Need OR
   interFreqCarrierFreqListExt-r12 InterFreqCarrierFreqListExt-r12 OPTIONAL -- Need OR
   ]],
   [[ interFreqCarrierFreqListExt-v1280 InterFreqCarrierFreqListExt-v1280 OPTIONAL -- Need OR
   ]],
   [[ interFreqCarrierFreqList-v1310 InterFreqCarrierFreqList-v1310 OPTIONAL, -- Need OR
   interFreqCarrierFreqListExt-v1310 InterFreqCarrierFreqListExt-v1310 OPTIONAL -- Need OR
   ]]
}

SIB5 message

.SIB5

MS1
System Information Block 5

Time : 17:45:36.299
interFreqCarrierFreqList
  InterFreqCarrierFreqList : 
    [0 ] :
      dl-CarrierFreq : 38950
      q-RxLevMin : -65     
      t-ReselectionEUTRA : 1
      threshX-High : 12    
      threshX-Low : 11    
      allowedMeasBandwidth : mbw100
      presenceAntennaPort1 : False
      cellReselectionPriority : 7
      neighCellConfig          
        Binary string (Bin) : 00
          [0 ] : 0
          [1 ] : 0

• InterFreqCarrierFreqList 异频临小区重选列表,最多8个
• dl-CarrierFreq 异频临小区频点
• q-RxLevMin 异频临小区最小的RSRP. Value -70 ~ -22 dBm.
• t-ReselectionEUTRA 定义了小区重选时间 0 ~ 7 s
• threshX-High # Threshold (in dB) used by UE for cell re-selection to a HIGHER priority # The Srxlev of the candiate cell is greater then threshX_High # Value 0 to 31 dB. Actual value= Signaled value * 2
• threshX-Low # Threshold (in dB) used by UE for cell re-selection to a LOWER priority # Cell re-selection is allowed only when Srxlev of the candiate cell is greater then threshX_Low and RSRP of serving cell is less than the value of ThreshServingLow singalled within SIB3 # Value 0 to 31 dB. Actual value= Signaled value * 2
• allowedMeasBandwidth 异频临小区带宽
• presenceAntennaPort1 [later]
• cellReselectionPriority 异频临小区优先级
• neighCellConfig 用于提供临小区MBSFN和上下行配比信息. 00: 不是所有邻区均和当前服务小区有相同的MBSFN子帧配置. 10: 所有邻区均和当前服务小区有相同的MBSFN子帧配置. 01: 所有邻区均没有MBSFN子帧配置. 11: 相对于服务小区的UL/DL配置, 邻区中存在不同的UL/DL配置. 对于TDD, 00, 10, 01只用于服务小区和邻区的UL/DL配置相同情况.