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5G(NR)网络中波束失败探测和恢复
KangGuoYing
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发表于 2020-08-04 10:01:02  只看楼主 

        5G(NR)网络中的波束失败探测和恢复 在TS 38.321-5.17有详细介绍,其中过程可简单描述如下:整理:kangguoying20200804


 1.波束失败检测及恢复整理:kangguoying20200804

   

Step

Direction方向

说明

1

< UE >

波束失败(终端测量L1 RSRP低于设定门限)

2

< UE >

搜索其他质量好的波束

3

UE -> NW

果检测到预定的波束失效次数,用候选波束(PRACH)触发波束失效恢复过程。   预定义的波束失效次数引发这一过程是由RRC中波束失败最大计数定义的。 /    ue 发送的PRACH中带有   BFR-SSB-Resource中指定的ID 的 prach。

4

UE <- NW

(网络)回复波束故障恢复请求((RACH Response)。网络通过msg2DCI 指定(恢复)的搜索空间


2.RRC波束失败探测参数配置


         RadioLinkMonitoringConfig ::= SEQUENCE {整理:kangguoying20200804

            failureDetectionResourcesToAddModList     SEQUENCE (SIZE(1..maxNrofFailureDetectionResources))

                                                   OF RadioLinkMonitoringRS

            failureDetectionResourcesToReleaseList    SEQUENCE (SIZE(1..maxNrofFailureDetectionResources))

                                                   OF RadioLinkMonitoringRS-Id整理:kangguoying20200804

            beamFailureInstanceMaxCount               ENUMERATED {n1, n2, n3, n4, n5, n6, n8, n10}整理:kangguoying20200804

            beamFailureDetectionTimer                 ENUMERATED {pbfd1, pbfd2, pbfd3, pbfd4, pbfd5,

                                                         pbfd6, pbfd8, pbfd10}   ...} 整理:kangguoying20200804

         RadioLinkMonitoringRS ::= SEQUENCE {整理:kangguoying20200804

            radioLinkMonitoringRS-Id                  RadioLinkMonitoringRS-Id,整理:kangguoying20200804

            purpose                                   ENUMERATED {beamFailure, rlf, both},

            detectionResource                         CHOICE {整理:kangguoying20200804

                                                   ssb-Index SSB-Index,整理:kangguoying20200804

                                                   csi-RS-Index NZP-CSI-RS-ResourceId   },...} 整理:kangguoying20200804


3.RRC波束恢复参数配置


         BeamFailureRecoveryConfig ::= SEQUENCE {整理:kangguoying20200804

            rootSequenceIndex-BFR              INTEGER (0..137) OPTIONAL, -- Need M整理:kangguoying20200804

            rach-ConfigBFR                     RACH-ConfigGeneric OPTIONAL, -- Need M

            rsrp-ThresholdSSB                  RSRP-Range OPTIONAL, -- Need M整理:kangguoying20200804

            candidateBeamRSList                SEQUENCE (SIZE(1..maxNrofCandidateBeams))整理:kangguoying20200804

                                                  OF PRACH-ResourceDedicatedBFR OPTIONAL, -- Need M整理:kangguoying20200804

            ssb-perRACH-Occasion               ENUMERATED {oneEighth, oneFourth, oneHalf, one, two,

                                                           four, eight, sixteen} OPTIONAL, -- Need M整理:kangguoying20200804

            ra-ssb-OccasionMaskIndex           INTEGER (0..15) OPTIONAL, -- Need M整理:kangguoying20200804

            recoverySearchSpaceId              SearchSpaceId OPTIONAL, -- Need R

            ra-Prioritization                  RA-Prioritization OPTIONAL, -- Need R整理:kangguoying20200804

            beamFailureRecoveryTimer    ENUMERATED {ms10, ms20, ms40, ms60, ms80, ms100, ms150, ms200} OPTIONAL, -- Need M

            ...,   [[      msg1-SubcarrierSpacing-v1530 SubcarrierSpacing OPTIONAL -- Need M   ]]}整理:kangguoying20200804

 

         PRACH-ResourceDedicatedBFR ::= CHOICE {

            ssb                               BFR-SSB-Resource,整理:kangguoying20200804

            csi-RS                            BFR-CSIRS-Resource

         BFR-SSB-Resource ::= SEQUENCE {整理:kangguoying20200804

            ssb                               SSB-Index,整理:kangguoying20200804

            ra-PreambleIndex                  INTEGER (0..63),   ...} 整理:kangguoying20200804

         BFR-CSIRS-Resource ::= SEQUENCE {整理:kangguoying20200804

            csi-RS                            NZP-CSI-RS-ResourceId,整理:kangguoying20200804

            ra-OccasionList                   SEQUENCE (SIZE(1..maxRA-OccasionsPerCSIRS))整理:kangguoying20200804

                                                 OF INTEGER (0..maxRA-Occasions-1) OPTIONAL, -- Need R整理:kangguoying20200804

            ra-PreambleIndex                  INTEGER (0..63) OPTIONAL, -- Need R   ...} 整理:kangguoying20200804

 

         RACH-ConfigGeneric ::= SEQUENCE {整理:kangguoying20200804

            prach-ConfigurationIndex          INTEGER (0..255),整理:kangguoying20200804

            msg1-FDM                          ENUMERATED {one, two, four, eight},整理:kangguoying20200804

            msg1-FrequencyStart               INTEGER (0..maxNrofPhysicalResourceBlocks-1),整理:kangguoying20200804

            zeroCorrelationZoneConfig         INTEGER(0..15),整理:kangguoying20200804

            preambleReceivedTargetPower       INTEGER (-202..-60),整理整理:kangguoying20200804:kangguoying20200804

            preambleTransMax                  ENUMERATED {n3,n4,n5,n6,n7,n8,n10,n20,n50,n100,n200},

            powerRampingStep                  ENUMERATED {dB0, dB2, dB4, dB6},整理:kangguoying20200804

            ra-ResponseWindow                 ENUMERATED {sl1, sl2, sl4, sl8, sl10, sl20, sl40, sl80},   ...}  

         RA-Prioritization ::= SEQUENCE {整理:kangguoying20200804

            powerRampingStepHighPriority      ENUMERATED {dB0, dB2, dB4, dB6},整理:kangguoying20200804

            scalingFactorBI                   ENUMERATED {zero, dot25, dot5, dot75} OPTIONAL, -- Need R   ...} 


原文来自:http://www.sharetechnote.com/ 整理:kangguoying20200804

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