由于5G NSA 是通過(guò) 4G走控制面信令碌廓，5G走數(shù)據(jù)用戶面的雙鏈接塞椎。相比較于4G來(lái)說(shuō)
注冊(cè)的log中首先能夠看到是BS對(duì)手機(jī)進(jìn)行了兩次UECapabilityEnquiry鼓择，一次是請(qǐng)求上報(bào)4G的能力冬念，第二次是請(qǐng)求上報(bào)5G NR的能力鸭巴，詳情如下：
UE Capability上報(bào)分為：
PDCP-Parameters：PDCP層對(duì)應(yīng)的UE Capability
RLC-Parameters：RLC層對(duì)應(yīng)的UE Capability
MAC-Parameters：MAC層對(duì)應(yīng)的UE Capability
Phy-Parameters：PHY層對(duì)應(yīng)的UE Capability
RF-Parameters：RF（射頻）相關(guān)的UE Capability
第一次Enquiry：
Information：
第二次Enquiry：
第二次的Information ：
在LTE的Attach accept Msg 后令杈，會(huì)進(jìn)行RRCConnectionReconfiguration走敌，在RRCConnectionReconfigurationComplete后會(huì)激活默認(rèn)EPS承載，在激活承載結(jié)束后逗噩，ULInformationTransfer 后會(huì)進(jìn)行又一次RRCConnectionReconfiguration
準(zhǔn)備進(jìn)行4/5G的測(cè)量的RRC重配掉丽，包含4/5G的頻點(diǎn)，A1和B1事件的門限异雁。
Qcom 平臺(tái)：
iRATAPNFallback specifies the priority of the APN entries in ims_apn_name_db[x].cAPNName to be
used for a specific RAT. Each RAT that is to be acknowledged by IMS must have an entry covered in
this NV.
? RAT = (iRATAPNFallback & 0x1F000) >> 12
? RAT:
? RAT_GPRS = 1
? RAT_EDGE = 2
? RAT_WCDMA = 3
? RAT_EHRPD = 4
? RAT_LTE = 5
? RAT_HSPA = 6
? RAT_W_HSPA = 7
? RAT_WLAN = 8
? RAT_IWLAN = 9
? RAT_LTENOVOPS = 10
? RAT_TDSCDMA = 11
? RAT_CDMA = 12
? RAT_NR = 13
? RAT_NR_NOVOPS = 14
First priority RAT = ( iPMRATAPNFallback & 0x0E00 ) >> 9
? Other priority RAT settings are currently not used.
? APN type enum:
? 1 = IMS
? 2 = Internet
? 3 = emergency
? 4 = RCS
? 5 = UT
? 6 = WLAN
