在5G(NR)网络中终端除根据网络配置为切换、重定向和SCG添加进行同频、异频和异系统的测量外;还要为资源分配和干扰抑制进行干扰测量;这就是3GPP TS 38.331中定义的干扰测量--I1事件; I1事件定义 该事件要求在网络底噪高于设定门限时进行测量上报;而网络底噪低于该门限时停止测量和上报。 1.当满足以下条件(I1-1)时,进行测量和上报 I1-1:Mi–Hys>Thresh 2.当满足以下条件(I1-2)时,退出测量和上报 I1-2:Mi+Hys<Thresh 式中参数定义: Mi:干扰测量结果,不考虑任何偏移。 Hys:事件迟滞参数(即在reportConfigNR中为此事件定义迟滞) Thresh:事件阈值参数(事件reportConfigNR中定义的I1-Threshold)。 Mi,Thresh以dBm表示,Hys以dB表示。 干扰测量 3GPP在TS38.214-5.2.2.4中定义CSI IM(Resource for Interference Measurement)资源是为干扰测量保留的一组特定资源粒子(通过RRC消息进行配置)。频率和时域位置如下图所示: 测量参数配置 网络侧通过RRC为终端(UE)进行干扰测量资源配置,参数中配置有子载波,符号等参数,具体如下: CSI-IM-Resource ::= SEQUENCE { csi-IM-ResourceId CSI-IM-ResourceId, csi-IM-ResourceElementPattern CHOICE { pattern0 SEQUENCE { subcarrierLocation-p0 ENUMERATED { s0, s2, s4, s6, s8, s10 }, symbolLocation-p0 INTEGER (0..12) }, pattern1 SEQUENCE { subcarrierLocation-p1 ENUMERATED { s0, s4, s8 }, symbolLocation-p1 INTEGER (0..13) } } OPTIONAL, -- Need M freqBand(频段) CSI-FrequencyOccupation OPTIONAL, periodicityAndOffset(周期和偏滞) CSI-ResourcePeriodicityAndOffset OPTIONAL, Periodic Or SemiPersistent ... }(周期或半静态) 配置参数定义 pattern 0/pattern1:(见上图) CSI-FrequencyOccupation ::= SEQUENCE { startingRB INTEGER (0..maxNrofPhysicalResourceBlocks-1), nrofRBs INTEGER (24..maxNrofPhysicalResourceBlocksPlus1), ...} startingRB:PRB where this CSI resource starts in relation to common resource block #0 (CRB#0) on the common resource block grid. Only multiples of 4 are allowed (0, 4, ...)--公共资源集中CSI资源起始PRB,仅(0,4.....)四的倍数可用; nrofRBs: Number of PRBs across which this CSI resource spans. Only multiples of 4 are allowed. The smallest configurable number is the minimum of 24 and the width of the associated BWP. If the configured value is larger than the width of the corresponding BWP, the UE shall assume that the actual CSI-RS bandwidth is equal to the width of the BWP.--CSI资源占用的PRB数(仅四的倍数可用)--每个BWP内最少配置24个; |
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