一、终端能力查询和上报 无线通信系统中为了准确、高效协调和互通,基站必须掌握终端(UE)的所有能力。基站查询"UE Capability",UE上报所有信息。在掌握终端(UE)的能力后基站可以为终端(UE)进行准确的调度。如果终端(UE)支持某个特性或功能,基站具有该功能则应为其配置;如果UE不支持某个特性(或基站不具备某功能),基站就不会为UE配置。 图1.NSA架构中终端能力查询流程 二、5G终端能力特点 5G网络分为独立组网(SA)和非独立(NSA)组网形式;其中在非独立(NSA)组网形式下终端需同时连接在4G(LTE)和5G(NR)无线网络;因此,终端(UE)上报的能力中除4G和5G外,还包括4G与5G双连接的能力(MR-DC)。 3GPP在TS 38.306 [26]和TS 38.331中定义了终端双连接能力“IE UE-MRDC-Capability”参数,其用于传达MR-DC的终端(UE)无线接入能力参数的消息; *MR-DC是指(Multi Rat Dual Connectivity),EN-DC是MRDC中的一种。 三、5G终端MRDC能力解析 在5G网络中终端的MR-DC能力是在收到网络的"UE Capability Enquiry"消息后上报的;其中包括终端4G、5G无线频段及4G和5G组合频段的支持能力。 图2.5G终端能力查询和上报 3.1 UE CapabilityEnquiry(网络终端能力查询) RRC-MSG(无线链路控制消息) ..msg 0> 03 00000011 T ....struDL-DCCH-Message(DCCH下行消息结构) ........dldcchmessage 1> 34 0------- * ..........c1 -0110--- * ............ueCapabilityEnquiry(UE能力查询) -----10- ..............rrc-TransactionIdentifier:0x2 (2) ..............criticalExtensions -------0 * ................ueCapabilityEnquiry 2> 4A 01------ * ..................ue-CapabilityRAT-RequestList --001--- * (UE不同系统能力查询列表) 3> 06 00------ ......................rat-Type:nr (0)(无线网络类型1:NR) ......................capabilityRequestFilter --000110 4> E0 11------ * ........................UE-CapabilityRequestFilterNR --10---- * ..........................frequencyBandListFilter(频段列表) 5> 0F 0000111- * ............................FreqBandInformation -------1 * ..............................bandInformationNR(NR频段信息) 6> 30 0011---- * 7> A0 101000-- ................................bandNR:0x29 (41)(NR BAND:41) 8> 00 000----- ................................maxCarriersRequestedDL:0x1 (1)(下行最多载波) ---00000 ................................maxCarriersRequestedUL:0x1 (1)(上行最多载波) ............................FreqBandInformation 9> 98 1------- * ..............................bandInformationNR -0011--- * -----000 10> 9C 1001110- ................................bandNR:0x4f (79) (NR BAND:79) -------0 11> 00 0000---- ................................maxCarriersRequestedDL:0x1 (1) ----0000 12> 4C 0------- ................................maxCarriersRequestedUL:0x1 (1) ............................FreqBandInformation -1------ * ..............................bandInformationNR --0011-- * ------00 13> 4F 01001111 ................................bandNR:0x50 (80)(NR BAND:80) 14> 00 00000--- ................................maxCarriersRequestedDL:0x1 (1) -----000 15> 26 00------ ................................maxCarriersRequestedUL:0x1 (1) ............................FreqBandInformation --1----- * ..............................bandInformationNR ---0011- * -------0 16> 28 00101000 17> 00 0------- ................................bandNR:0x51 (81)(NR BAND:81) -00000-- ................................maxCarriersRequestedDL:0x1 (1) ------00 18> 13 000----- ................................maxCarriersRequestedUL:0x1 (1) ............................FreqBandInformation ---1---- * ..............................bandInformationNR ----0011 * 19> 14 00010100 20> 40 01------ ................................bandNR:0x52 (82)(NR BAND:82) --00000- ................................maxCarriersRequestedDL:0x1 (1) -------0 21> 09 0000---- ................................maxCarriersRequestedUL:0x1 (1) ............................FreqBandInformation ----1--- * ..............................bandInformationNR -----001 22> 8A 1------- * -0001010 23> 40 010----- ................................bandNR:0x53 (83)(NR BAND:83) ---00000 ................................maxCarriersRequestedDL:0x1 (1) 24> 04 00000--- ................................maxCarriersRequestedUL:0x1 (1) ............................FreqBandInformation -----1-- * ..............................bandInformationNR ------00 25> C5 11------ * --000101 26> 30 0011---- ................................bandNR:0x54 (84) (NR BAND:84) ----0000 27> 02 0------- ................................maxCarriersRequestedDL:0x1 (1) -00000-- ................................maxCarriersRequestedUL:0x1 (1) ............................FreqBandInformation ------1- * ..............................bandInformationNR -------0 28> 62 011----- * ---00010 29> A8 10101--- ................................bandNR:0x56 (86) (NR BAND:86) -----000 30> 00 00------ ................................maxCarriersRequestedDL:0x1 (1) --00000- ................................maxCarriersRequestedUL:0x1 (1) -------0 31> 04 00------ * ....................UE-CapabilityRAT-Request --00---- * ----010- ......................rat-Type:eutra (2)(无线网络类型2:EUTRAN) ..................ue-CapabilityEnquiryExt (UE扩展能力查询) -------0 32> 09 0000100- * ....................UECapabilityEnquiry-v1560-IEs (版本R15) -------1 33> 40 0------- * ......................capabilityRequestFilterCommon (公共能力合集) -1000000 34> 20 00100000 35> 28 00101000 36> 00 00000000 * 3.2 MRDC-Capability(终端上报的MRDC) RRC-MSG ..msg 0> 09 00001001 T ....struUE-MRDC-Capability(终端MRDC能力结构) 1> A0 10100000 2> 0F 000----- * ........measAndMobParametersMRDC (MRDC测量和添加参数) ---011-- * ..........measAndMobParametersMRDC-XDD-Diff (MRDC XDD参数) ------11 * ............sftd-MeasPSCell:supported (0)(SFTD PSCell测量支持) ............sftd-MeasNR-Cell:supported (0)(SFTD NR Cell测量支持) ..........measAndMobParametersMRDC-FRX-Diff (MRDC FRX参数) 3> 90 1------- * ............simultaneousRxDataSSB-DiffNumerology:supported (0) (SSB不同SCS数据接收支持) ........rf-ParametersMRDC -001---- * ..........appliedFreqBandListFilter ----0000 4> 0F 0000111- * ............FreqBandInformation ( 频段信息) -------1 * ..............bandInformationNR(NR BAND信息) 5> 30 0011---- * ----0000 6> A0 101000-- ................bandNR:0x29 (41) (NR BAND:41) ------00 7> 00 000----- ................maxCarriersRequestedDL:0x1 (1) ---00000 ................maxCarriersRequestedUL:0x1 (1) ............FreqBandInformation 8> 98 1------- * ..............bandInformationNR -0011--- * -----000 9> 9C 1001110- ................bandNR:0x4f (79) (NR BAND:79) -------0 10> 00 0000---- ................maxCarriersRequestedDL:0x1 (1) ----0000 11> 4C 0------- ................maxCarriersRequestedUL:0x1 (1) ............FreqBandInformation -1------ * ..............bandInformationNR --0011-- * ------00 12> 4F 01001111 ................bandNR:0x50 (80) 13> 00 00000--- ................maxCarriersRequestedDL:0x1 (1) -----000 14> 26 00------ ................maxCarriersRequestedUL:0x1 (1) ............FreqBandInformation --1----- * ..............bandInformationNR ---0011- * -------0 15> 28 00101000 16> 00 0------- ................bandNR:0x51 (81) -00000-- ................maxCarriersRequestedDL:0x1 (1) ------00 17> 13 000----- ................maxCarriersRequestedUL:0x1 (1) ............FreqBandInformation ---1---- * ..............bandInformationNR ----0011 * 18> 14 00010100 19> 40 01------ ................bandNR:0x52 (82) --00000- ................maxCarriersRequestedDL:0x1 (1) -------0 20> 09 0000---- ................maxCarriersRequestedUL:0x1 (1) ............FreqBandInformation ----1--- * ..............bandInformationNR -----001 21> 8A 1------- * -0001010 22> 40 010----- ................bandNR:0x53 (83) ---00000 ................maxCarriersRequestedDL:0x1 (1) 23> 04 00000--- ................maxCarriersRequestedUL:0x1 (1) ............FreqBandInformation -----1-- * ..............bandInformationNR ------00 24> C5 11------ * --000101 25> 30 0011---- ................bandNR:0x54 (84) ----0000 26> 02 0------- ................maxCarriersRequestedDL:0x1 (1) -00000-- ................maxCarriersRequestedUL:0x1 (1) ............FreqBandInformation ------1- * ..............bandInformationNR -------0 27> 62 011----- * ---00010 28> A8 10101--- ................bandNR:0x56 (86) -----000 29> 00 00------ ................maxCarriersRequestedDL:0x1 (1) --00000- ................maxCarriersRequestedUL:0x1 (1) ........generalParametersMRDC (MRDC公共参数) -------0 30> 40 0100---- * ..........splitDRB-withUL-Both-MCG-SCG:supported (0) (上行splitDRB在MCG与SCG的支持) ----0000 * |
|