CSFB回落时在RRCconnectionrelease信令中是下发频点组还是直接是一个频点？

如题。
CSFB回落时在RRCconnectionrelease信令中是下发频点组还是直接是一个频点？基于R8 盲从定向，如果下发只是一个BCCH，那么网络根据什么来选择下发那个频点，随机选择？请高手解答下最好附上信令截图，感激不尽。

 一种说法，随机选择邻区下发盲重定向消息。
          另一种说法，终端先脱离LTE网，按下发的频点组测量GSM，根据C1C2算法进行驻留；如果都不满足，进行全频段搜索。 是第一种说法还是第二 说法呢？

在联通FDD中其指示3G的频点和邻区扰码，详见以下：
RRCConnectionRelease
    MORE: 0
    LENGTH: 1993
    LENGTH: 1993
    LOG_CODE: B0C0
    timeStamp: 16:20:44.928
    RRCConnectionRelease
        VERSION: 7
        RRC_REL: 10
    RRC_REL: 113
        RRC_VER: 1
        PHYSICAL_CELL_ID: 368(4G服务小区)
        FREQ: 1650
        System_Frame_Number: 34
        Subframe: 8
        PDU_NUM: 6
        ENCODED_MSG_LEN: 1964
        RRC: DL-DCCH-Message
   message
      c1
         rrcConnectionRelease
            rrc_TransactionIdentifier = 0
            criticalExtensions
               c1
                  rrcConnectionRelease_r8
                     releaseCause = other
                     redirectedCarrierInfo（重定向方向）
                        utra_FDD = 10713
                        nonCriticalExtension
                        nonCriticalExtension
                           cellInfoList_r9 (以下是3G邻区扰码)
   utra_FDD_r9[0]                 physCellId_r9 = 201                               
   utra_FDD_r9[1]                 physCellId_r9 = 209                                
   utra_FDD_r9[2]                 physCellId_r9 = 233                              
utra_FDD_r9[3]                  physCellId_r9 = 393        
          utra_FDD_r9[4]                 physCellId_r9 = 11                                
utra_FDD_r9[5]                  physCellId_r9 = 35                                
  utra_FDD_r9[6]                  physCellId_r9 = 448                        
         utra_FDD_r9[7]                physCellId_r9 = 3