ota log
协议摘取
36.331 UECapabilityEnquiry field descriptions 中，requestedFreqBandsNR-MRDC是 38.331中的FreqBandList IE类型。
UE在回复UE capability information 消息时，在 NR或MR-DCcapability containers 中，只需针对这个字段中的NR/LTEband解决支持的NR CA组合、MR-DC band combination、和MR-DC band combination对应的feature sets。
| requestedFreqBandsNR-MRDC Interpreted as FreqBandList IE as specified in TS 38.331 [82]. It concerns a list of NR and/ or E-UTRA frequency bands for which the UE is requested to provide its supported NR CA and/or MR-DC band combinations (i.e. within the UE capability containers for NR and MR-DC, as requested by E-UTRAN) and feature sets corresponding to the MR-DC band combinations (i.e. within the UE capability containers for LTE and NR, as requested by E-UTRAN). |
38.331 6.3.3 UE capability information elements 中:
FreqBandList
The IE FreqBandList is used by the network to request NR CA and/or MR-DC band combinations for specific NR and/or E-UTRA frequency bands and/or up to a specific number of carriers and/or up to specific aggregated bandwidth.This is also used to request feature sets (for NR) and feature set combinations (for NR and MR-DC).
requestedFreqBandsNR-MRDC包含有nr 和eutra的band信息。在刚才的ota中就是 eutra band1,3；nr band78.
网络通过此字段包含的band列表，请求 NR CA 和NR和E-Utra间 的band聚合，当然还可以针对特定的载波和聚合带宽来查询聚合能力。 同时还被用于查询NR的feature sets，以及 NR and MR-DC的feature set combinations。
frequencyBandListFilter
在38.331 5.6.1.4 Setting band combinations, feature set combinations and feature sets supported by the UE 中,
NOTE 1: Capability enquiry without frequencyBandListFilter is not supported.
即 Capability enquiry必须包含frequencyBandListFilter。但是在现网ota信令中并没有看到这个字段。不过查看协议其结构和
requestedFreqBandsNR-MRDC一样，都是FreqBandList IE。所以requestedFreqBandsNR-MRDC应该起了frequencyBandListFilter同样的作用。
比如38.331 5.6.1.4中
1> include the received frequencyBandListFilter in the field appliedFreqBandListFilter of the requested UE capability, except if the requested rat-Type is nr and the network included the eutra-nr-only field;
要求UE收到appliedFreqBandListFilter放到frequencyBandListFilter 中。
在现网log中虽然没有收到frequencyBandListFilter，但是在UE-NR-Capability和UE-MRDC-Capability都有appliedFreqBandListFilter字段。内容和requestedFreqBandsNR-MRDC中相同。所以确实将 requestedFreqBandsNR-MRDC当做frequencyBandListFilter了。
UE-NR-Capability
针对只支持nsa的终端，在针对nr的UE-NR-Capability中没有看到supportedBandCombinationList，featureSetCombinations，featureSets。在后续支持SA的log中，应该会包含。
RF-ParametersMRDC
| RF-ParametersMRDC field descriptions |
| appliedFreqBandListFilter In this field the UE mirrors the FreqBandList that the NW provided in the capability enquiry, if any. The UE filtered the band combinations in the supportedBandCombinationList in accordance with this appliedFreqBandListFilter. |
| supportedBandCombinationList A list of band combinations that the UE supports for MR-DC. The FeatureSetCombinationId:s in this list refer to the FeatureSetCombination entries in the featureSetCombinations list in the UE-MRDC-Capability IE. |
| supportedBandCombinationListNEDC-Only A list of band combinations that the UE supports only for NE-DC. The FeatureSetCombinationId:s in this list refer to the FeatureSetCombination entries in the featureSetCombinations list in the UE-MRDC-Capability IE. |