精华内容
下载资源
问答
  • 小区重选

    2021-01-17 13:14:41
    小区重选分为同频小区重选(Intra)和异频小区重选(Intre),与重选有关的消息主要是 SIB1,SIB3,SIB4,SIB5。 当前手机驻留在服务小区超过1s,以及目标小区比当前小区更优(ranking) 就会触发重选。...

    参考文档

      https://blog.csdn.net/u010202588/article/details/54646080

    https://wenku.baidu.com/view/8db7c31c5acfa1c7ab00cc58.html

    https://www.txrjy.com/thread-1134676-1-1.html

    https://blog.csdn.net/twjy1314/article/details/68065029

    https://blog.csdn.net/xiashaohua/article/details/40828969?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.add_param_isCf&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.add_param_isCf

    https://blog.csdn.net/macrohasdefined/article/details/19974069?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-9.edu_weight&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-9.edu_weight
    https://blog.csdn.net/zhangchangfeng1/article/details/100011608?utm_medium=distribute.pc_relevant.none-task-blog-title-11&spm=1001.2101.3001.4242
    https://blog.csdn.net/perimeter/article/details/44836199?utm_medium=distribute.pc_relevant.none-task-blog-title-14&spm=1001.2101.3001.4242
    https://blog.csdn.net/u011212816/article/details/81901356?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-7.edu_weight&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-7.edu_weight
    https://blog.csdn.net/zhangchangfeng1/article/details/100011136?utm_medium=distribute.pc_relevant.none-task-blog-title-7&spm=1001.2101.3001.4242
    https://blog.csdn.net/qq_27540925/article/details/79459111?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight
    https://download.csdn.net/download/qq_27540925/10271778
    https://blog.csdn.net/qq_27540925/article/details/79467754
    https://blog.csdn.net/u011263761/article/details/79896301?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight
    https://blog.csdn.net/keyanting_2018/article/details/88423362?utm_medium=distribute.pc_relevant.none-task-blog-title-2&spm=1001.2101.3001.4242
    https://blog.csdn.net/qq_43631743/article/details/106420674?utm_medium=distribute.pc_relevant_download.none-task-blog-baidujs-8.nonecase&depth_1-utm_source=distribute.pc_relevant_download.none-task-blog-baidujs-8.nonecase
    https://zhuanlan.zhihu.com/p/62245921
    https://www.cnblogs.com/zxc2man/p/7778058.html
    http://sigquit.wordpress.com/2012/08/20/an-introduction-to-libqmi/ http://www.lanedo.com/users/amorgado/talks/FOSDEM2013%20-%20Mobile%20broadband%20modem%20control%20protocols.pdf http://blogs.gnome.org/dcbw/2010/04/15/mobile-broadband-and-qualcomm-proprietary-protocols/
    https://blog.csdn.net/zhangpengzhen1990/article/details/107432403
    https://www.csdn.net/gather_22/MtTagg1sNTIzMDgtYmxvZwO0O0OO0O0O.html
    https://wenku.baidu.com/view/86911e291cb91a37f111f18583d049649a660e49.html
    https://wenku.baidu.com/view/a54c242e6edb6f1aff001fbf.html
    https://max.book118.com/html/2019/0603/8057002073002026.shtm
    http://www.mamicode.com/info-detail-478669.html
    https://wenku.baidu.com/view/678adb3e05a1b0717fd5360cba1aa81145318f76.html
    https://blog.csdn.net/perimeter/article/details/44836199?locationNum=3
    https://wenku.baidu.com/view/ab36e7788c9951e79b89680203d8ce2f00666505.html

    https://blog.csdn.net/u011212816/article/details/97394498
    https://www.csdn.net/gather_21/MtjaIg4sNTgwMTEtYmxvZwO0O0OO0O0O.html
    https://blog.csdn.net/u011212816/article/details/81069710
    https://blog.csdn.net/qq_36562473/article/details/78535222?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~first_rank_v2~rank_v25-5-78535222.nonecase&utm_term=nas%E5%B1%82%20qxdm&spm=1000.2123.3001.4430
    https://blog.csdn.net/u011263761/article/details/79896301?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~first_rank_v2~rank_v25-8-79896301.nonecase&utm_term=nas%E5%B1%82%20qxdm&spm=1000.2123.3001.4430
    https://blog.csdn.net/zhangchangfeng1/article/details/100011136?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~first_rank_v2~rank_v25-9-100011136.nonecase&utm_term=nas%E5%B1%82%20qxdm&spm=1000.2123.3001.4430
    https://blog.csdn.net/keyanting_2018/article/details/88407069?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight
    https://blog.csdn.net/qq_30943197/article/details/81434284?utm_medium=distribute.pc_relevant.none-task-blog-utm_term-10&spm=1001.2101.3001.4242
    https://zhuanlan.zhihu.com/p/62245921
    http://bbs.16rd.com/thread-17115-1-1.html
    https://www.baidu.com/link?url=X5uVJJTgutaV7QkvduU_mkKs5HnVp62Z2YZPJuz9MVQCisrWLnUFAMaIAGdi2ApNfQ56HQYuIPh-d-s-ODsNo_&wd=&eqid=cc03e06e000342aa000000025f8f969f
    https://blog.csdn.net/zhangbijun1230/article/details/79951752

     

    前言:

          小区重选分为同频小区重选(Intra)和异频小区重选(Intre),与重选有关的消息主要是

    SIB1,SIB3,SIB4,SIB5。2G,3G,4G总体流程差不多,5G分为SA,ENDC两种网络架构,处理

    流程相对复杂一点。

    目录

    1: 异频小区重选

    2  同频小区重选

    3  主要参数解读

    4  GSM-LTE

    5  LTE-LTE


    一 异频小区重选流程(intre 不同制式)


     

    ===============
    其中condtion 为:
    
    ServingCell < threshServingLow
    StargetCell > threshXLow
    
    ===============
    
     Rs = Qmeas,s + Qhyst
     Rt = Qmeas,n – Qoffset
    
    

    其中

    05:25:04.376047	[0xB0C0]	BCCH_DL_SCH / SystemInformation
    
    Interpreted PDU:
    
    value BCCH-DL-SCH-Message ::= 
    {
      message c1 : systemInformation : 
      
                  sib3 : 
                    {
                      cellReselectionInfoCommon 
                      {
                        q-Hyst dB4   //Rs = Qmeas,s + Qhyst(=4)
                      },
                   
                      intraFreqCellReselectionInfo 
                      {
                        q-RxLevMin -64, //RxLevMin
                        s-IntraSearch 29,  //同频重选触发条件
                        presenceAntennaPort1 FALSE,
                        neighCellConfig '01'B,
                        t-ReselectionEUTRA 1, //测量时间1s
                        t-ReselectionEUTRA-SF 
                        {
                          sf-Medium lDot0,
                          sf-High oDot75
                        }

    高优先级别小区:

    同优先级小区

    低优先级小区

     

    不同优先级的异频及异系统之间重选准则

    其中:

    TreselectionRAT

    小区重选定时器,在LMT可针对不同的频率/RAT分别进行配置,在相应的广播消息中下发(UMTS-SIB6;GSM-SIB7)

    ThreshX, HighP

    重选到高优先级小区时,目标小区门限,在LMT可配置,在相应的广播消息中下发(UMTS-SIB6;GSM-SIB7)

    ThreshServing, LowP

    重选到低优先级小区时,服务小区门限,在LMT可配置,在SIB3中下发(UMTS-SIB6;GSM-SIB7)

    ThreshX, LowP

    重选到低优先级小区时,目标小区门限,在LMT可配置,在相应的广播消息中下发(UMTS-SIB6;GSM-SIB7)


    二 同频小区重选

     

      如果 手机满足 Srxlev > SIntraSearchP and Squal > SIntraSearchQ,不执行测量



    三   S 准则

     1: S 准则

            Srxlev>0 & Squal>0

            Srxlev = Qrxlevmeas - (Qrxlevmin+Qrxlevminoffset)-Pcompensation

            Squal = Qqualmeas - (Qualmin+Qualminoffset)

            Pcompensation = (PEMAX-PUMAX)

    Srxlev

    小区选择接收电平值 (dB)

    Qrxlevmeas

    测量得到的目标小区的接收电平值 (RSRP) 

    Qrxlevmin

    小区选择要求的最小接收电平值 (dBm) ,在LMT配置,在SIB1下发

    Qrxlevminoffset

    当UE正常驻留在一个VPLMN(当前访问的)中,周期性的搜索高优先级的PLMN所在的小区的时候才会使用。由于我们一般测试的时候使用的网络都是HPLMN(归属),因此这个参数默认为0。

    Pcompensation

    MAX(PEMAX-PUMAX,0) (dB),正常算出来为0 或1

    PEMAX

    小区配置的UE最大上行可用的发射功率(dBm),由后台配置,在SIB 1中发送

    PUMAX

    UE最大发射功率 ,由UE自身的能力等级来决定,高通终端默认为23dBm ,根据class 而定


          

    05:25:04.239369	[0xB0C0]	BCCH_DL_SCH / SystemInformationBlockType1
    
    
    Interpreted PDU:
    
    
              trackingAreaCode '01010001 11111001'B,
              cellIdentity '01110110 00001010 10111001 1011'B,
              cellBarred notBarred,
              intraFreqReselection allowed,
              csg-Indication FALSE
            },
            cellSelectionInfo 
            {
              q-RxLevMin -64  //Qrxlevmin S 准则
            },
            freqBandIndicator 1,
            schedulingInfoList 
            {
              {
                si-Periodicity rf16,
                sib-MappingInfo 
                {
                  sibType3  // 需要读取SIB3 
                }
              },
              {
                si-Periodicity rf32,
                sib-MappingInfo 
                {
                  sibType5 // 需要读取SIB5 
                }
              },
              {
                si-Periodicity rf64,
                sib-MappingInfo 
                {
                  sibType6 // 需要读取SIB6
                }
              }
          
    
    05:25:04.376047          LTE RRC/Low              [       lte_rrc_csp.c  30582] CSP: Proceeding to cell select request1      
    =====S准则计算===
    05:25:04.376047          LTE RRC/High             [       lte_rrc_csp.c  30613] CSP: q_rxlevmin = -128 qrxlevmin_offset = 01                    
    05:25:04.376047          LTE RRC/High             [       lte_rrc_csp.c  30678] CSP: Rel9 q_qualmin = -128 q_qualmin_offset = 01                   
    05:25:04.385525          LTE ML1/High             [   lte_ml1_sm_idle.c   4821] Cell (450,492) Srxlev 40, rsrp -88 rsrq -3 qrx -128 qrx_off 0 pmax 23 pcomp 01                                                                   05:25:04.385525          LTE ML1/High             [   lte_ml1_sm_idle.c   4911] Cell (450,492) Squal 125, LL RSRQ -3 normalized rsrq -3 q_qual -128 q_qual_off 01                                                                                           
    SrxLev = -88-(-128+0)-0= 40>0
    Squal = -3-(-128+0)=125 >0
    ===满足S准则=============               
    05:25:04.385525          LTE RRC/Low              [       lte_rrc_csp.c  33089] CSP: Suitable cell1               

    四  主要参数

    2.2

    TreselectionRAT

    小区重选定时器,在LMT可针对不同的频率/RAT分别进行配置,在相应的广播消息中下发(UMTS-SIB6;GSM-SIB7)

    Thresh X High

    重选到高优先级小区时,目标小区门限,在LMT可配置,在相应的广播消息中下发(UMTS-SIB6;GSM-SIB7)

    ThreshServing, LowP

    重选到低优先级小区时,服务小区门限,在LMT可配置,在SIB3中下发(UMTS-SIB6;GSM-SIB7)

    Thresh X Low

    重选到低优先级小区时,目标小区门限,在LMT可配置,在相应的广播消息中下发(UMTS-SIB6;GSM-SIB7)

     Thresh X High        = 12
     Thresh X Low         = 12

    异频小区重选的优先级:

        

    最低 2G 3G 4G D频段:37900,38098 E频段:38950,39148  
    0 1 2 3 5 7  

     

      2.2 Sintrasearch 同频测量启动门限

        RRC 层根据 RSRP 测量结果计算 Srxlev(S 准则)大于该值时,UE无需启动同频测量

        小于等于该值时,UE需启动同频测量。界面取值范围范围0~31,单位2分贝,建议值29,缺省值29,即Srxlev(S 准则)>58(29*2)dB,即在最低接收电平为-128dbm时(其他为0),UE同频测量启动门限RSRP值小于或等于-70dbm(-128dbm+58dB)即启动同频重选测量。

    2.3 R(Ranking)准则

           同频小区或者异频但具有同等优先级的小区,UE 采用 R 准则对小区进行重选排序。

           R 准则是目标小区在Treselection 时间内(同频和异频的Treselection 可能不同),Rt(目标小区)持续超过 Rs (服务小区),那么 UE 就会重选到目标小区。

           服务小区:Rs = Qmeas,s + Qhyst

     

     2.4  Qmeas,t:目标小区的RSRP值

            Rt = Qmeas,t - Qoffset

           

         该参数表示本地小区与同频(或异频)邻区之间的小区偏置。用于控制小区重选的难易程度,参数值越大,越难重选到此邻区。当该参数配置为非0dB时,在系统消息SIB4(异频SIB5)中下发;当该参数配置为0dB时,不在系统消息SIB4(异频SIB5)中下发,UE在重选判决时按照该值为0dB处理。

    该参数设置的越大,越不容易触发重选;该参数设置的越小,越容易触发重选。该参数设置过大或过小都会降低接入成功率。(对同频只有小区偏置,对于异频还要加一个异频频率偏置,通常为0dB或1dB).界面取值范围(±:0,1,2,3,4,5,6,8,10,12,14,16,18,20,22,24),单位1分贝,建议值0dB,缺省值0dB。

     

    2.5 1.Snonintrasearch:异频/异系统测量启动门限

       

    该参数表示异频/异系统小区重选测量启动门限。对于重选优先级大于服务频点的异频/异系统,UE总是启动测量;对于重选优先级小于等于服务频点的异频或者重选优先级小于服务频点的异系统,当RRC 层根据 RSRP 测量结果计算 Srxlev(S 准则)大于该值时,UE无需启动异频/异系统测量;当RRC 层根据 RSRP 测量结果计算 Srxlev(S 准则)小于或等于该值时,UE需启动异频/异系统测量。

    界面取值范围0~31,单位2分贝,建议值9,缺省值9,即Srxlev(S 准则)>18(9*2)dB,即在最低接收电平为-128dbm时(其他为0),UE异频/异系统测量启动门限RSRP值小于或等于-110dbm(-128dbm+18dB)即启动异频/异系统重选测量。

     

    2.6 2. ThreshXHigh:高优先级重选门限

        

    如果目标小区的优先级比当前服务小区的优先级高,并且目标小区的 S 值在时间ReselectionTimer 内持续超过门限参数 ThreshXHigh(异频频点高优先级重选门限值),那么不管当前小区的S 值是多少,UE都会重选到目标小区。界面取值范围0~31,单位2分贝。

    2.1 GERAN(2G)建议值7,缺省值7,即在最低接收电平为-128dbm时(其他为0),RSRP大于或等于-114dbm(-128dbm+14dB)即可重选至高优先级小区。

    2.2 UTRAN(3G)建议值6,缺省值6,即在最低接收电平为-128dbm时(其他为0),RSRP大于或等于-116dbm(-128dbm+12dB)即可重选至高优先级小区。

    2.3 EUTRAN(4G)建议值11,缺省值11,即在最低接收电平为-128dbm时(其他为0),RSRP大于或等于-106dbm(-128dbm+12dB)即可重选至高优先级小区。

     

    2.7 3. ThrshServLow:服务频点低优先级重选门限

        

    定义了 UE 在重选优先级较低的小区时,服务小区的测量门限,在此情况下,目标小区也必须满足一定的测量门限(threshXLow :低优先级重选门限值)。

    界面取值范围0~31,单位2分贝,建议值7,缺省值7,即Srxlev(S 准则)>14(7*2)dB,即在最低接收电平为-128dbm时(其他为0),服务频点低优先级重选启动门限RSRP值小于或等于于-114dbm(-128dbm+14dB)即启动服务频点低优先级重选准备,

    若目标小区满足ThreshXLow (低优先级重选门限值),即执行重选。
     

      2.9 SIB 消息

         

    2.10 

    同频或同优先级的异频小区重选准则—R准则(cell-ranking criterion)

    Rs = Qmeas,s +QHyst
    Rn = Qmeas,t – Qoffset

     

    参数

     

    TreselectionRAT

    小区重选定时器,在LMT可针对不同的频率/RAT分别进行配置,在相应的广播消息中下发(UMTS-SIB6;GSM-SIB7)

    ThreshX, HighP

    重选到高优先级小区时,目标小区门限,在LMT可配置,在相应的广播消息中下发(UMTS-SIB6;GSM-SIB7)

    ThreshServing, LowP

    重选到低优先级小区时,服务小区门限,在LMT可配置,在SIB3中下发(UMTS-SIB6;GSM-SIB7)

    ThreshX, LowP

    重选到低优先级小区时,目标小区门限,在LMT可配置,在相应的广播消息中下发(UMTS-SIB6;GSM-SIB7)

     

     

    Rs

    服务小区定级值

    Rn

    邻区定级值

    Qmeas

    小区重选时测得的RSRP值

    Qhyst

    小区重选时服务小区的迟滞,由后台配置,在SIB3中发送,和小区相关

    Qoffset

    小区重选时相邻小区的质量偏差:

    如果是同频小区并且Qoffsets,n 有效,等于Qoffsets,n ,否则为零。

    如果是异频小区并且Qoffsets,n 有效,等于Qoffsets,n 加Qoffsetfrequency ,否则等于Qoffsetfrequency

     


    五 GSM-LTE 

     

     

    =======step1 读取系统参数=================
    
    该SIB消息中,GSM 优先级别低,且有高优先级别小区,优先重选至高优先级别的LTE小区                                            
    
    14:19:47.472015	[0x5B2F]	RR/DSDS RR/BCCH DL/System Information Type 2quater
        
            priority_and_e_utran_parameters_description_present = 1 (0x1)
            Priority and E-UTRAN Parameters Description
              serving_cell_priority_parameters_description_present = 1 (0x1)
              Serving Cell Priority Parameters Description
                GERAN_PRIORITY = 1 (0x1) //GSM 服务小区的优先级别 0-7
                THRESH_Priority_Search = 15 (0xf) // always,当服务小区高于该值的时候,不按照优先级别搜网
                THRESH_GSM_low = 0 (0x0)//当GSM小区低于该值的时候,进行重选 0db
                H_PRIO = 0 (0x0)
                T_Reselection = 0 (0x0) //5ms
              _3g_priority_parameters_description_present = 1 (0x1)
              
              E-UTRAN Parameters Description
               
             
                struct0[0]
                  const_1 = 1 (0x1)
                  Repeated E-UTRAN Neighbour Cells
                    struct0_count = 1 (0x1)
                    struct0[0]
                      const_1 = 1 (0x1)
                      EARFCN = 3576 (0xdf8) //目标小区频点
                      measurement_bandwidth_present = 0 (0x0)
                    const_0 = 0 (0x0)
                    e_utran_priority_present = 1 (0x1)
                    E-UTRAN_PRIORITY = 5 (0x5) //目标小区的优先级别
                    THRESH_E-UTRAN_high = 10 (0xa) //当目标小区rsrp高于该值的时候,20db 则切换
                    thresh_e_utran_low_present = 0 (0x0) 
                    e_utran_qrxlevmin_present = 1 (0x1) 
                    E-UTRAN_QRXLEVMIN = 6 (0x6)//驻网最低的rsrp要求
             
    ------------------------------------------------
     GSM小区参数
      C1=RXLEV-RXLEV_ACCESS_MIN - MAX ((MS_TXPWR_MAX_CCH - P), 0) 
      RXLEV_ACCESS_MIN: SIB3
      MS_TXPWR_MAX_CCH:  SIB3
      P: 手机
    14:19:47.554323          GSM GPRS GRR/High        [    rr_resel_calcs.c   4397] gs1:Serving cell C1 (S_GSM): 50  
    14:19:47.472005          GSM GPRS GRR/High        [      rr_decode_ie.c   7509] gs1:Received SI2q(Index=1, Count=2)   
    14:19:47.554323          GSM GPRS GRR/High        [          rr_resel.c   3892] gs1: rr_resel_greatest_gsm_s_value(TRUE, gas_id) = 50, THRESH_gsm_low == 0                                                                                
    14:19:47.554323          GSM GPRS GRR/High        [    rr_resel_calcs.c   4397] gs1:Serving cell C1 (S_GSM): 50                                                                                                           
    14:19:47.554323          GSM GPRS GRR/Medium      [            rr_g2w.c   4413] gs1:GERAN Priority: 1                                                                                                                              
    ------------------------------------------------                                                                                                                        
    LTE 小区参数      
    14:19:47.472005          GSM GPRS GRR/Medium      [      rr_decode_ie.c   6466]   LTE Frequency: 3576, Bandwidth: 0                                                                                                                                 
    14:19:47.472005          GSM GPRS GRR/Medium      [      rr_decode_ie.c   6476] LTE Priority: 5 ,Thresh High: 10 Thresh Low: 0, Qrxlevmin: 6
    
    Qrxlevmin = 140-6*2 = 128
    
    ------------------------------------------------                                                                                                                                               
                                                                                                                 
               
    ======step2  开启重选定时器===========
    14:19:48.495990          GSM GPRS GRR/Medium      [            rr_g2w.c   4528] gs1:Cell 0: Starting thresh_high_timer (0x51) duration 5000 ms
    14:19:48.495990          GSM GPRS GRR/Medium      [        rr_l1_send.c   2771] gs1:RR_FG2X: Sending MPH_SPECIFIC_IRAT_FREQ_UPDATE_REQ: rat=2,arfcn=3576  
    
    =======step3 小区测量 ========== 
    step2 测量LTE邻小区,计算是否达到重选条件  Since LTE is higher priority cell , UE will calculate S (LTE) and compare it with THRESH_HIGH
    
    GSM GPRS GRR/High        [            rr_g2w.c   2403] gs1:Received 2 LTE measurements for EARFCN 3576 
    GSM L1/Medium            [    l1_sc_irat_lte.c    839] gs1:G2L: meas cell id=345 i=0 meas_cnt=1 det_cnt=1 rsrp=-76
    GSM L1/Medium            [    l1_sc_irat_lte.c    839] gs1:G2L: meas cell id=311 i=1 meas_cnt=1 det_cnt=1 rsrp=-72
    GSM GPRS GRR/High        [            rr_g2w.c   2631]  EARFCN: 3576, PCID: 311, RSRP: -72, RSRQ: -5
    GSM GPRS GRR/High        [            rr_g2w.c   2631]  EARFCN: 3576, PCID: 345, RSRP: -76, RSRQ: -14
    GSM GPRS GRR/High        [            rr_g2w.c   2403] gs1:Received 2 LTE measurements for EARFCN 3576
    GSM GPRS GRR/High        [            rr_g2w.c   2437] gs1:  PCID: 345, RSRP: -70, RSRQ: -14
    GSM GPRS GRR/High        [            rr_g2w.c   2437] gs1:  PCID: 311, RSRP: -68, RSRQ: -11
    GSM GPRS GRR/High        [            rr_g2w.c   2838] [0] RAT: LTE, E-ARFCN: 3576, PCID: 311, S-value: 56, Priority: 5, High Threshold: 20, Low Threshold: 20
    GSM GPRS GRR/High        [            rr_g2w.c   2838] [1] RAT: LTE, E-ARFCN: 3576, PCID: 345, S-value: 52, Priority: 5, High Threshold: 20, Low Threshold: 20
    GSM GPRS GRR/High        [            rr_g2w.c   2838] [0] RAT: LTE, E-ARFCN: 3576, PCID: 311, S-value: 60, Priority: 5, High Threshold: 20, Low Threshold: 
    GSM GPRS GRR/High        [            rr_g2w.c   2838] [1] RAT: LTE, E-ARFCN: 3576, PCID: 345, S-value: 58, Priority: 5, High Threshold: 20, Low Threshold: 20
    GSM GPRS GRR/High        [            rr_g2w.c   2838] [0] RAT: LTE, E-ARFCN: 3576, PCID: 311, S-value: 60, Priority: 5, High Threshold: 20, Low Threshold: 20
    
    
    
    S of LTE Cell = RSRP – QRXLEVMIN(126),这个值就是S-value值
    s-value = 128-76 =52
    
    =========step4 定时器到到期,满足重选条件,准备重选============
    
    14:19:53.664740          GSM GPRS GRR/High        [     rr_gprs_debug.c   3885] gs1:Timer RR_IRAT_PRIORITY_RESEL_THRESH_HIGH_TIMER_1 expired in state CAMPED                                                                                                                       
    
    
    ============step5 Gsm-LTE 协议栈切换=================
     去激活 GSM mode
    14:19:53.685000          GSM GPRS GRR/Sys Info    [     rr_gprs_debug.c   4351] gs1:IMsg: RR_RESEL_G2W_IMSG_L1_DEACTIVATED_IND
     激活 LTE modem,重选
    
    14:19:53.695000          LTE RRC/High             [lte_rrc_irat_from_G_mgr.c   1960] IRAT_G_TO_LTE:CPHY Started for Reselection from G to LTE
    14:19:53.793984          LTE RRC/High             [       lte_rrc_csp.c  29490] CSP: IRAT To LTE reselection
    
    =============step6 LTE CAMPED 流程(遵循S准则===================
    
    14:19:53.695000          LTE RRC/Low              [       lte_rrc_csp.c  23856] CSP: Received IRAT To LTE Resel Reqi
    14:19:53.695000          LTE RRC/Low              [       lte_rrc_csp.c  23980] CSP: Requested PLMN = MCC: [4 0 9 ] MNC: [8 8 ]
    14:19:53.695990          LTE RRC/Low              [       lte_rrc_csp.c  13074] CSP: Found BW 25 for EARFCN 3576 from acq_db
    14:19:53.771979          LTE RRC/Low              [       lte_rrc_csp.c  28922] CSP: Received Acq cnf for earfcn 3576 pci 
    14:19:53.771979          LTE RRC/Low              [       lte_rrc_csp.c  28977] CSP: Acquistion Cnf is success1lte_rrc_csp.c  
    14:19:53.771979          LTE RRC/High             [       lte_rrc_csp.c   6877] CSP: Sent Get SIBs Request1 
    14:19:53.793516          LTE RRC/Low              [       lte_rrc_csp.c  30914] CSP: Received SIB1
    14:19:53.793984          LTE RRC/High             [       lte_rrc_csp.c  13165] CSP: TA is forbidden
    14:19:53.793984          LTE RRC/High             [       lte_rrc_csp.c  13165] CSP: TA is forbidden1
    14:19:53.793984          LTE RRC/High             [       lte_rrc_csp.c  17252] CSP: No Suitable PLMN found1
    14:19:53.793984          LTE RRC/High             [       lte_rrc_csp.c  31205] CSP: Forbidden TA check has failed
    
    
    
    ------------------------------------------------
    

    五 LTE-LTE(同频)

        5.1 SIB 消息读取触发重选的条件

           

    //step1 读取SIB重选参数
    06:26:12.359008	[0xB0C0]	BCCH_DL_SCH / SystemInformationBlockType1
    
    Radio Bearer ID = 0, Physical Cell ID = 364
    
    Interpreted PDU:
    
    
            cellSelectionInfo 
            {
              q-RxLevMin -64 //QrxlevMin
            },
            freqBandIndicator 8,
            schedulingInfoList 
            {
              {
                si-Periodicity rf16,
                sib-MappingInfo 
                {
                  sibType3 //要读取SIB3
                }
              },
              {
                si-Periodicity rf32,
                sib-MappingInfo 
                {
                  sibType5 //要读取SIB5
                }
              },
              {
                si-Periodicity rf64,
                sib-MappingInfo 
                {
                  sibType6 //要读取SIB6
                }
              }
            },
            si-WindowLength ms40,
            systemInfoValueTag 13
          }
    }
    06:26:12.359125	[0xB0C0]	BCCH_DL_SCH / SystemInformation
    
                  sib3 : 
                    {
                      cellReselectionInfoCommon 
                      {
                        q-Hyst dB4  //服务小区Q+4
                      },
                      cellReselectionServingFreqInfo 
                      {
                        s-NonIntraSearch 11,
                        threshServingLow 4,
                        cellReselectionPriority 6
                      },
                      intraFreqCellReselectionInfo 
                      {
                        q-RxLevMin -64, //RxlevMin*2 = -128
                        s-IntraSearch 29, //服务小区高于该值,不测量
                        presenceAntennaPort1 FALSE,
                        neighCellConfig '01'B,
                        t-ReselectionEUTRA 1, //time
                        t-ReselectionEUTRA-SF 
                        {
                          sf-Medium lDot0,
                          sf-High oDot75
                        }
                      }
                    }
                }
              }
          }
    }

        5.2   不断的测量当前手机信号情况(0xB17F)

        

         

    2020 Dec 22  06:26:10.974  [54]  0xB17F  LTE ML1 Serving Cell Meas and Eval
    Subscription ID = 2
    Version                   = 5
    Standards Version         = Release 9
    E-ARFCN                   = 350
    Physical Cell ID          = 254
    Serving Layer Priority    = 6
    Measured RSRP             = -124.31 dBm
    Average RSRP              = -124.31 dBm
    Measured RSRQ             = -18.13 dB
    Average RSRQ              = -18.13 dB
    Measured RSSI             = -86.25 dBm
    Q_rxlevmin                = -128.00 dB
    P_max                     = 23 dBm
    Max UE Tx Power           = 23 dBm
    S_rxlev                   = 3 dB
    Num DRX S Fail            = 0 DRX cycles
    S Intra Search            = 58 dB
    S Non Intra Search        = 24 dB
    Measurement Rules Updated = true
    Measurement Rules         = intra frequency | low priority | equal priority | high priority
    Q Qual Min                = 0 dB
    S Qual                    = 92 dB
    S Intra Search Q          = 0
    S Non Intra Search Q      = 0
    
    因为 S_rxlev <S Intra Search ,所以执行同频测量

    5.3 邻小区测量结果,主要看是否满足s准则,以及Rt(0xB192)

        

     

    06:26:08.738  [70]  0xB192  LTE ML1 Neighbor Cell Meas Request/Response
    Subscription ID = 2
    Version              = 1
    Number of SubPackets = 2
    SubPacket ID         = 26
    Idle Mode Neighbor Cell Measurement Request
       Version = 2
       SubPacket Size = 28 bytes
       E-ARFCN         = 3737
       Num Cells       = 1
       Num Rx Ant      = 2
       Dupexing Mode   = FDD
       Neighbor Cells
          ------------------------------------------------
          |   |    |              |Enabled |      |      |
          |   |Cell|              |Tx      |TTL   |FTL   |
          |#  |ID  |CP Type       |Antennas|Enable|Enable|
          ------------------------------------------------
          |  0| 364|        Normal|       1| false| false|
    
    SubPacket ID         = 27
    Neighbor Cell Meas Result
       Version = 4
       SubPacket Size = 64 bytes
       E-ARFCN         = 3737
       Num Cells       = 1
       Duplexing Mode  = FDD
       Serving Cell Index = PCell
       Neighbor Cells
          ---------------------------------------------------------------------------------------------------
          |   |        |           |Inst   |Inst   |Inst    |Inst   |Inst   |       |Inst   |Inst   |       |
          |   |        |FTL        |RSRP   |RSRP   |Measured|RSRQ   |RSRQ   |Inst   |RSSI   |RSSI   |Inst   |
          |   |Physical|Cumulative |Rx[0]  |Rx[1]  |RSRP    |Rx[0]  |Rx[1]  |RSRQ   |Rx[0]  |Rx[1]  |RSSI   |
          |#  |Cell ID |Freq Offset|(dBm)  |(dBm)  |(dBm)   |(dBm)  |(dBm)  |(dBm)  |(dBm)  |(dBm)  |(dBm)  |
          ---------------------------------------------------------------------------------------------------
          |  0|     364|          0|-112.38|-106.06| -106.06| -12.31| -11.50| -11.50| -92.25| -86.81| -86.81|
    
    

    5.4  只要在Treselection 时间范围内, 邻小区满足S准则,且如下364小区,Rt>Rs(0xB181).优先级别排在第一位

    
    
    
    
    
    
    00:13:25.557842          LML1/LowFreq/High/LML1   [   lte_ml1_sm_idle.c   6337] Sending Resel Indication to IDLE STM                      -                        
    00:13:25.557972          LML1/LowFreq/High/LML1   [lte_ml1_sm_idle_stm.c   4908] Received resel indication in state 0                        -                        
    00:13:25.558009          LML1/LowFreq/High/LML1   [lte_ml1_sm_idle_resel_stm.c   2705] Resel_stm: Resel indication to RRC for LTE freq 3737 cell_id 364                                          
                        
    
    00:13:25.557772          LML1/LowFreq/High/LML1   [  lte_ml1_mdb_idle.c  10362] Serv cell (350,254) prio 6.0 Mob 1 Qhyst 4, q_detal 0, rank -116.48432                                        
    00:13:28.064970          LML1/LowFreq/High/LML1   [  lte_ml1_mdb_idle.c  10362] Serv cell (3737,364) prio 6.0 Mob 1 Qhyst 4, q_detal 0, rank -96.11712                        
    00:13:25.557772          LML1/LowFreq/High/LML1   [  lte_ml1_mdb_idle.c  10362] Serv cell (350,254) prio 6.0 Mob 1 Qhyst 4, q_detal 0, rank -116.48432   -116.4843                         
    00:13:28.064970          LML1/LowFreq/High/LML1   [  lte_ml1_mdb_idle.c  10362] Serv cell (3737,364) prio 6.0 Mob 1 Qhyst 4, q_detal 0, rank -96.11712        
    
    
    06:26:12.308990	[0xB181]	LTE ML1 Intra Frequency Cell Reselection
    Version              = 1
    Number of SubPackets = 3
    SubPacket ID         = 10
    Idle Mode Reselection Measurements Common
       Version                        = 2
       SubPacket Size                 = 12 bytes
       Serving Cell E-ARFCN           = 350
       Serving Cell Physical Cell ID  = 254
       Current UE Mobility State      = Normal Mobility
       Priority Categories Evaluated  = Equal
    SubPacket ID         = 5
    Idle Meas Serving Frequency Resel Info
       Version                = 25
       SubPacket Size         = 16 bytes
       Standards Version      = Release 9
       Serving Cell Priority  = 6
       S Non-Intra Search     = 24
       Thresh Serving Low     = 8
       S Non Intra Search Q   = 0 dB
       Thres Serving Low Q    = 0 dB
    SubPacket ID         = 11
    Idle Mode Reselection Measurements LTE Frequency
       Version              = 40
       SubPacket Size       = 92 bytes
       Instance             = 1
       Number of Layers     = 4
       Treselection         = 0 s
       Layer[0]
          E-ARFCN              = 350
          Treselection         = 1 s
          Q Offset Frequency   = 0 dB
          Priority             = 6
          Number of Cells      = 3
          Thresh X High        = 0
          Thresh X Low         = 8
          Neighbor Cells
             -----------------------------------------------------------------------------------------------------
             |   |        |      |RSSI   |      |RSRP   |RSRP   |RSRQ   |RSRQ   |            |        |          |
             |   |Physical|Srxlev|Inst   |Q     |Average|Inst   |Average|Inst   |Treselection|Rank    |Rank      |
             |#  |ID      |(dB)  |(dBm)  |Offset|(dBm)  |(dBm)  |(dBm)  |(dBm)  |(s)         |Interger|Fractional|
             -----------------------------------------------------------------------------------------------------
             |  0|     254|     7| -84.31|  0 dB|-120.50|-120.50| -16.13| -16.13|          63|      47|     0.516|
             |  1|     252|    12| -95.38|  0 dB|-115.25|-115.25| -10.00| -10.00|           1|      48|     0.727|
             |  2|     347|     1| -95.31|  0 dB|-126.63|-126.63| -21.75| -21.75|          63|      37|     0.359|
    
       Layer[1]
          E-ARFCN              = 1506
          Treselection         = 1 s
          Q Offset Frequency   = 0 dB
          Priority             = 6
          Number of Cells      = 0
          Thresh X High        = 12
          Thresh X Low         = 12
       Layer[2]
          E-ARFCN              = 1650
          Treselection         = 1 s
          Q Offset Frequency   = 0 dB
          Priority             = 6
          Number of Cells      = 0
          Thresh X High        = 12
          Thresh X Low         = 12
       Layer[3]
          E-ARFCN              = 3737
          Treselection         = 1 s
          Q Offset Frequency   = 0 dB
          Priority             = 6
          Number of Cells      = 1
          Thresh X High        = 12
          Thresh X Low         = 12
          Neighbor Cells
             -----------------------------------------------------------------------------------------------------
             |   |        |      |RSSI   |      |RSRP   |RSRP   |RSRQ   |RSRQ   |            |        |          |
             |   |Physical|Srxlev|Inst   |Q     |Average|Inst   |Average|Inst   |Treselection|Rank    |Rank      |
             |#  |ID      |(dB)  |(dBm)  |Offset|(dBm)  |(dBm)  |(dBm)  |(dBm)  |(s)         |Interger|Fractional|
             -----------------------------------------------------------------------------------------------------
             |  0|     364|    25| -84.00|  0 dB|-102.31|-102.31| -10.56| -10.56|           1|      61|     0.672|               
    

    5.5  重选到邻小区上

    00:13:17.810889          RRC/HighFreq/High/NR5GRRC[      nr5g_rrc_acq.c   3327] RRC ACQ DEBUG: Cell is suitable for camping1                                  
    00:13:17.843381          RRC/HighFreq/High/NR5GRRC[      nr5g_rrc_csp.c  11566] CSP: Camped on physical cell ID 57 on earfcn 6339841              
    
    
    06:26:01.946918	[0xB0C2]	LTE RRC Serving Cell Info Log Pkt
    Version = 3
    Physical cell ID = 254
    DL FREQ = 350
    
    
    
    06:26:12.391168	[0xB0C2]	LTE RRC Serving Cell Info Log Pkt
    Version = 3
    Physical cell ID = 364
    
    
    
    

         

    展开全文
  • TD-SCDMA中小区重选空闲模式和小区重选的中文协议
  • 小区重选及系统内切换参数汇总.xlsx小区重选及系统内切换参数汇总.xlsx小区重选及系统内切换参数汇总.xlsx小区重选及系统内切换参数汇总.xlsx小区重选及系统内切换参数汇总.xlsx
  • 在移动通信系统中,用户移动终端(UE)会根据小区重选准则,周期搜索当前最优小区驻留。这种周期重选机制能保证当前终端驻留小区的信号强度和质量,为了达到预期的呼叫建立性能,这也是必须的。反应灵敏的小区重选机制...
  • LTE小区选择和小区重选(3

    万次阅读 2016-10-27 15:50:53
    本节主要介绍小区重选过程,再次强调 重选过程发生在IDLE状态下   LTE小区重选分为同系统内的同频、异频重选以及异系统重选。   LTE小区同频重选没有优先级的概念。异频和异系统重选有高优先级的小区重选和低...

    本节主要介绍小区重选过程,再次强调 重选过程发生在IDLE状态下

     

    LTE小区重选分为同系统内的同频、异频重选以及异系统重选。

     

    LTE小区同频重选没有优先级的概念。异频和异系统重选有高优先级的小区重选和低优先级的小区重选

     

    向高优先级的小区重选时,只要高优先级的小区门限超过一定门限,不管本小区信号如何,终端都要向高优先小区进行重选

     

    向低优先级的小区重选时,需要本小区的信号低于一定门限值,低优先级的小区高于一定门限值才能发生重选。

     

    小区重选的步骤:启动测量->计算、评估->排序->重选

     

    同频小区重选:

    对于同频测量:主要参数在SIB1和SIB3中

    启动测量:

          如果满足Srxlev > SIntraSearchP 且Squal >SIntraSearchQ时,UE可以选择不进行intra_freq测量

          否则开始进行测量同频小区

    相关的参数有:

    TreselectionRAT 测量时间

    SIntraSearchP 用于启动同频测量的RSRP信号电平门限值

    SIntraSearchQ 用于启动同频测量的RSRQ信号质量门限值

      

    2011 Jul 22 14:27:32.497  [00] 0xB0C0  LTE RRC OTA Packet --  BCCH_DL_SCH

    Pkt Version = 2

    RRC Release Number.Major.minor = 9.3.0

    Radio Bearer ID = 0, Physical Cell ID = 11

    Freq = 5230

    SysFrameNum = 990, SubFrameNum = 5

    PDU Number = BCCH_DL_SCHMessage,    MsgLength = 22

     

    Interpreted PDU:

     

    value BCCH-DL-SCH-Message ::=

    {

     message c1 : systemInformationBlockType1 :

         ============================================

           cellSelectionInfo

           {

             q-RxLevMin -60, //最小接入电平值-60*2=-120dBm

             q-RxLevMinOffset 4 //q-RxLevMinOffset=4*2=8dB

           },

          

             {

               si-Periodicity rf8,

               sib-MappingInfo

               {

                 sibType3//--->SIB3消息

               }

             }

           },

         

     2011 Jul 22 14:27:32.533  [00] 0xB0C0  LTE RRC OTA Packet --  BCCH_DL_SCH

    Pkt Version = 2

    RRC Release Number.Major.minor = 9.3.0

    Radio Bearer ID = 0, Physical Cell ID = 11

    Freq = 5230

    SysFrameNum = 994, SubFrameNum = 1

    PDU Number = BCCH_DL_SCHMessage,    MsgLength = 7

     

    Interpreted PDU:

     

    value BCCH-DL-SCH-Message ::=

    {

      message c1 : systemInformation:

         {

           criticalExtensions systemInformation-r8 :

             {

               sib-TypeAndInfo

               {

                 sib3 :

                   {

                     cellReselectionInfoCommon

                     {

                       q-Hyst dB2------------->=2dB

                     },

                     cellReselectionServingFreqInfo

                     {

                       s-NonIntraSearch 7,====SnonIntraSearchP”

                       threshServingLow 5,

                       cellReselectionPriority 5

                     },

                     intraFreqCellReselectionInfo ==同频测量信息

                     {

                       q-RxLevMin -60,

                       s-IntraSearch 31,//同频测量门限,SIntraSearchP

                       presenceAntennaPort1 TRUE,

                       neighCellConfig '01'B,

                       t-ReselectionEUTRA 2==时间 2s

                     }

                   }

     

    从LOG中可以看到:

    同频小区的测量:

    Srxlev = Qrxlevmeas – (Qrxlevmin + Qrxlevminoffset)– Pcompensation

          = Qrxlevmeas-(-60*2+4*2)-0= Qrxlevmeas+112< SintraSearchP=31

    Qrxlevmeas<31-112=-81dBm时,启动测量

    当邻区的Rn 大于服务小区的Rs时,即可进行小区重选。

     

     

    异频/异系统重选

    高优先级:

          EUTRAN or UTRAN RAT/ frequency : Squal > ThreshX, HighQ

          GERAN or CDMA2000 RAT/ frequency : Srxlev > ThreshX, HighP

    也就是说,只要邻小区高于一个门限值,不论当前小区门限值是多少,则都执行重选

    ThreshX, HighQ---在SIB5~SIB8中

     

    低优先级:

          EUTRAN or UTRAN RAT/ frequency :

                        Squal-serving < ThreshServing, LowQ 且Squal-neighbor > ThreshX, LowQ

    ThreshServing, LowQ---在SIB3中

    ThreshX, LowQ---在SIB5~SIB8中

          GERAN or CDMA2000 RAT/ frequency :

                        Squal-serving < ThreshServing, LowQ and Srxlev-neighbor >ThreshX, LowP

     也就是说,当前小区低于一个门限值,邻小区高于一个门限值,则进行重选

     

    若没有提供threshServingLowQ则所有的都是用Srxlev来进行判别

     

    小区使用R准则进行排序:

          Rs = Qmeas,s +QHyst   

          Rn = Qmeas,n - Qoffset

     

    LOG=====

    2013 Aug 14 02:59:42.869  [00] 0xB0C0  LTE RRC OTA Packet --  BCCH_DL_SCH

    cellSelectionInfo

           {

             q-RxLevMin -53

           },

    SIB3:

    cellReselectionServingFreqInfo

                     {

                       threshServingLow 0,

                       cellReselectionPriority 4—当前小区优先级=4

                     },

     

    2013 Aug 14 02:59:42.966  [00] 0xB0C0  LTE RRC OTA Packet --  BCCH_DL_SCH

    Pkt Version = 2

    RRC Release Number.Major.minor = 9.10.0

    Radio Bearer ID = 0, Physical Cell ID = 0

    Freq = 900

    SysFrameNum = 132, SubFrameNum = 3

    PDU Number = BCCH_DL_SCHMessage,    MsgLength = 17

     

    Interpreted PDU:

     

    value BCCH-DL-SCH-Message ::=

    {

      message c1 : systemInformation:

         {

           criticalExtensions systemInformation-r8 :

             {

               sib-TypeAndInfo

               {

                 sib5 :

                   {

                     interFreqCarrierFreqList //异频小区信息

                     {

                       {

                         dl-CarrierFreq 650,

                         q-RxLevMin -53,

                         t-ReselectionEUTRA 0,

                         threshX-High 10,

                         threshX-Low 1,

                         allowedMeasBandwidth mbw50,

                         presenceAntennaPort1 FALSE,

                         cellReselectionPriority 5,

                         neighCellConfig '01'B,

                         q-OffsetFreq dB0

                       },

                       {

                         dl-CarrierFreq 1150,

                         q-RxLevMin -53,===最小接入电平-106

                         t-ReselectionEUTRA 0,时间为0

                         threshX-High 10,

                         threshX-Low 1,

                         allowedMeasBandwidth mbw50,

                         presenceAntennaPort1 FALSE,

                         cellReselectionPriority4,

                         neighCellConfig '01'B,

                         q-OffsetFreq dB0

                       }

     

    同频同优先级重选,使用R准则:

    Rs = Qmeas,s + Qhyst=-90+0=-90

    Rn = Qmeas,n - Qoffset =-85-0=-85

    所以选择到邻小区PCI=3的小区上!

     

    2013 Aug 14 03:00:06.289  [00] 0xB0C0  LTE RRC OTA Packet --  BCCH_DL_SCH

    Pkt Version = 2

    RRC Release Number.Major.minor = 9.10.0

    Radio Bearer ID = 0, PhysicalCell ID = 3

    Freq = 1150

    SysFrameNum = 674, SubFrameNum = 1

    PDU Number = BCCH_DL_SCHMessage,    MsgLength = 7

     

    Interpreted PDU:

     

    value BCCH-DL-SCH-Message ::=

    {

      message c1 : systemInformation:

         {

           criticalExtensions systemInformation-r8 :

             {

               sib-TypeAndInfo

               {

                 sib3 :

                   {

                     cellReselectionInfoCommon

                     {

                       q-Hyst dB0====0

                     },

                     cellReselectionServingFreqInfo

                     {

                       threshServingLow 0,

                       cellReselectionPriority 4

                     },

                     intraFreqCellReselectionInfo

                     {

                       q-RxLevMin -53,

                       presenceAntennaPort1 FALSE,

                       neighCellConfig '01'B,

                       t-ReselectionEUTRA 0

                     }

                   }

               }

             }

         }

    }

     

     

     

    2013 Aug 14 03:00:06.630  [00] 0xB0C0  LTE RRC OTA Packet --  BCCH_DL_SCH

    Pkt Version = 2

    RRC Release Number.Major.minor = 9.10.0

    Radio Bearer ID = 0, Physical Cell ID = 3

    Freq = 1150

    SysFrameNum = 708, SubFrameNum = 3

    PDU Number = BCCH_DL_SCHMessage,    MsgLength = 17

     

    Interpreted PDU:

     

    value BCCH-DL-SCH-Message ::=

    {

      message c1 : systemInformation:

         {

           criticalExtensions systemInformation-r8 :

             {

               sib-TypeAndInfo

               {

                 sib5 :

                   {

                     interFreqCarrierFreqList

                     {

                       {

                         dl-CarrierFreq 900,

                         q-RxLevMin -53,

                         t-ReselectionEUTRA 0,

                         threshX-High 2,

                         threshX-Low 1,

                         allowedMeasBandwidth mbw50,

                         presenceAntennaPort1 FALSE,

                         cellReselectionPriority 4,

                         neighCellConfig '01'B,

                         q-OffsetFreq dB0

                       },

                       {

                         dl-CarrierFreq 650,

                         q-RxLevMin -53,==最小接入点评-106

                         t-ReselectionEUTRA 0,==重选时间0秒

                         threshX-High 10,

                         threshX-Low 1,

                         allowedMeasBandwidth mbw50,

                         presenceAntennaPort1 FALSE,

                         cellReselectionPriority 5,

                         neighCellConfig '01'B,

                         q-OffsetFreq dB0

                       }

    从优先级=4重选到优先级=5的高优先级小区上时,只需要邻小区的信号

    EUTRAN or UTRAN RAT/ frequency : Squal> ThreshX, HighQ

    也就是Squal = Qqualmeas – (Qqualmin +Qqualminoffset)= Qqualmeas-(-53*2+0)>10*2

    Qqualmeas>-86dBm就会重选过去

     

     

    sib3 :

                   {

                     cellReselectionInfoCommon

                     {

                       q-Hyst dB0

                     },

                     cellReselectionServingFreqInfo

                     {

                       threshServingLow 10,====== ThreshServing, LowQ

                       cellReselectionPriority 5

                     },

                     intraFreqCellReselectionInfo

                     {

                       q-RxLevMin -53,

                       presenceAntennaPort1 FALSE,

                       neighCellConfig '01'B,

                       t-ReselectionEUTRA 0

                     }

                   }

     

    2013 Aug 14 03:00:10.315  [00] 0xB0C0  LTE RRC OTA Packet --  BCCH_DL_SCH

    Pkt Version = 2

    RRC Release Number.Major.minor = 9.10.0

    Radio Bearer ID = 0, Physical Cell ID = 6

    Freq = 650

    SysFrameNum = 452, SubFrameNum = 3

    PDU Number = BCCH_DL_SCHMessage,    MsgLength = 17

     

    Interpreted PDU:

     

    value BCCH-DL-SCH-Message ::=

    {

      message c1 : systemInformation:

         {

           criticalExtensions systemInformation-r8 :

             {

               sib-TypeAndInfo

               {

                 sib5 :

                   {

                     interFreqCarrierFreqList

                     {

                       {

                         dl-CarrierFreq 900,

                         q-RxLevMin -53,

                         t-ReselectionEUTRA 0,

                         threshX-High2,

                         threshX-Low 1,

                         allowedMeasBandwidth mbw50,

                         presenceAntennaPort1 FALSE,

                         cellReselectionPriority 4,

                         neighCellConfig '01'B,

                         q-OffsetFreq dB0

                       },

                       {

                         dl-CarrierFreq 1150,

                         q-RxLevMin -53,

                         t-ReselectionEUTRA 0,

                         threshX-High 2,

                         threshX-Low 1,

                         allowedMeasBandwidth mbw50,

                         presenceAntennaPort1 FALSE,

                         cellReselectionPriority 4,

                         neighCellConfig '01'B,

                         q-OffsetFreq dB0

                       }

    从优先级=5重选到优先级=4的低优先级小区上时,需要本小区信号质量:

     

    低优先级:

          EUTRAN or UTRAN RAT/ frequency :

                        Squal-serving < ThreshServing, LowQ and Squal-neighbor >ThreshX, LowQ

    也就是:

    Squal = Qqualmeas – (Qqualmin + Qqualminoffset)=Qqualmeas-(-106+0)<10*2

    Qqualmeas<-86dBm

    临小区小区质量:Squal-neighbor > ThreshX, LowQ=Qqualmeas-(-106+0)>1*2

    Qqualmeas>-104dBm

    展开全文
  • 提出一种基于接入概率的小区重选优化算法对于小区重选R准则算法进行优化,进而使处于服务小区内低接入概率的UE更容易重选到高接入概率的邻小区,并通过建模和仿真分析了算法的性能;结合接入概率对小区重选中的相关...
  • 在UMTS中跨系统小区重选参数优化,周凯亮,,WCDMA网络正在世界各地部署,最大的挑战之一是使GSM和WCDMA跨系统小区重选的工作顺利进行。在GSM和WCDMA之间的跨系统小区重选使用户在设
  • LTE小区选择和小区重选(1)

    千次阅读 2016-10-27 15:50:47
    LTE类似GSM、WCDMA系统,有小区选择和小区重选过程,详细定义在3GPP 36.304   所谓小区选择是指终端尚未驻留到一个小区,需要选择一个合适小区进行驻留的过程(capme on),小区选择遵循 S 准则   所谓小区重选是指...

       LTE类似GSM、WCDMA系统,有小区选择和小区重选过程,详细定义在3GPP 36.304

     

    所谓小区选择是指终端尚未驻留到一个小区,需要选择一个合适小区进行驻留的过程(capme on),小区选择遵循 S准则

     

    所谓小区重选是指终端已驻留到一个小区cell1,由于某些愿意,需要离开本小区,重新主驻留到其他小区cell2的过程。小区重选的过程必须是在IDLE进行小区重选过程遵循S、R准则

     

    根据3GPP36.304协议规定,终端手下需要进行PLMN选择,然后才能进行小区选择/重选、当小区选择/重选成功后,才能发起注册。


    展开全文
  • TD-LTE/TD-SCDMA系统间的小区重选是无线资源控制模块在空闲模式下的重要功能之一,也是多模单待终端的必备功能之一,对系统间的互操作有重要的意义。本文简要介绍多模单待终端的现状,详细研究小区重选以及TD-LTE异...
  • 小区重选 定义

    2019-03-28 10:56:24
    LTE小区重选(cell reselection)指 UE 在空闲模式下通过监测邻区和当前小区的信号质量以选择一个最好的小区提供服务信号的过程。当邻区的信号质量及电平满足S准则且满足一定重选判决准则时,终端将接入该小区驻留。...

    https://blog.csdn.net/crjmail/article/details/85677843

    LTE小区重选(cell reselection)指 UE 在空闲模式下通过监测邻区和当前小区的信号质量以选择一个最好的小区提供服务信号的过程。当邻区的信号质量及电平满足S准则且满足一定重选判决准则时,终端将接入该小区驻留。

    UE 成功驻留后,将持续进行本小区测量。RRC 层根据 RSRP 测量结果计算 Srxlev(S 准则),并将其与Sintrasearch(同频测量启动门限)和Snonintrasearch(异频/异系统测量启动门限)比较,作为是否启动邻区测量的判决条件。
     

    展开全文
  • 终端的三种工作模式关机、待机、联机待机状态的使命待机状态的考量待机状态的三大任务PLMN(公共陆地移动网)PLMN选择小区选择与小区重选终端的测量机制与判决小区选择中的测量小区重选中的测量小区选择判据小区重选...
  • 为验证TD-LTE 系统RRM(无线资源管理)中小区重选过程的协议一致性,设计了一种通过执行TTCN-3(testing and test control notation vertion 3,测试和测试控制表示法版本3)抽象测试套进行测试的新方法。...
  • LTE小区重选流程详解

    万次阅读 多人点赞 2018-02-24 11:22:13
    LTE小区重选流程详解LTE小区重选(cell reselection)指 UE 在空闲模式下通过监测邻区和当前小区的信号质量以选择一个最好的小区提供服务信号的过程。当邻区的信号质量及电平满足S准则且满足一定重选判决准则时,...
  • 以TD-SCDMA小区选择/重选的高层协议为基础,对空闲模式下和连接模式下的小区重选,内部周期性测量触发和事件触发的小区重选的相关过程及实现策略进行了分析,并给出了典型例子的流程图。
  • 介绍了当前GPRS应用的小区重选技术NCO的原理及其缺点,提出了一项全新的解决EGPRS小区重选的NC2技术,详细描述了阿尔卡特移动通信系统中NC2技术的工作流程,并对NC2和NCO作了对比测试,最后对该技术的应用前景作了...
  • wcdma系统中关于小区选择与小区重选的文档 从网络中收集来的。做无线通信的朋友可以下一下。
  • TD-SCDMA手机空闲模式小区重选控制T
  • 【摘要】RRC子层协议是TD-SCDMA的重要组成协议之一,其小区重选功能因为在保证服务小区质量,提高呼叫的成功率和降低掉话率方面的关键作用,而在TD-SCDMA的研发中占据着重要地位。文章介绍了RRC子层小区重选的基本...
  • 路径损耗值C1与小区重选参数C2 参数C1为供小区选择的路径损耗准则,服务小区的C1必须大于0,cv545%#(肒:JFD()$#本文来自移动通信网www.mscbsc.com,版权所有 C1=RXLEV-RXLEV_ACCESS_MIN - MAX ((MS_TXPWR_MAX_CCH ...
  • 小区重选讲解

    千次阅读 2011-03-18 09:59:00
    移动台选择某小区为当前服务小区后,在各种条件变化不大的情况下,移动台将驻留在所选的小区中,并根据服务小区的BCCH系统消息所指示的小区重选邻小区频点配置表,开始监测该表中所有BCCH载波的接收电平和同步...
  • 1.1.1 小区重选原理 UE在空闲模式下需要随时监测当前小区和邻小区的信号电平, 以选择一个最好的小区提供服务, 这就是小区重选过程, 连接模式下(CELL_FACH、CELL_PCH、URA_PCH)的小区重选准则与空闲模式下相同, 必须...
  • 小区重选后,发现新的TA,且不在网络下发的TA列表中 ②定时,周期性的进行TAU,及时定位 ③终端从异系统返回,从GSM、WCDMA等系统回到LTE系统 终端如何知道TA 基站广播的SIB1消息中,包含跟踪区的信息,称为TAI,...
  • 小区重选(cell reselection)指手机在空闲模式下,通过监测邻区和当前小区的信号质量以选择一个最好的小区提供服务信号的过程。 选择了一家新公司,并不意味着永久待在一家公司。 当前服务的公司,有可能由于经营...
  • 小区重选的评估

    2012-10-24 21:31:38
    小区的选择,评估标准,小区选择参数,测量准则,状态转化
  • 小区重选标准
  • 小区重选流程

    千次阅读 2017-08-18 16:36:45
    Cell Reselection Procedures in LTE Contents 1 Introduction 2 LTE Initial Access 3 Initial synchronization 3.1 Primary Synchronization ...3.2 Secon

空空如也

空空如也

1 2 3 4 5 ... 20
收藏数 3,575
精华内容 1,430
关键字:

小区重选