低速率专项进展汇报_0615_updata解读.pptx

低速率专题优化汇报 网络优化中心 2016年4月 低速率优化思路 宏观方面 调度算法研究 ----分析参数调整前后整体低速率采样点占比的变化情况 微观方面 CTR分析用户行为对于低速率点的影响 ----分析不同业务数据包等用户行为对于下行用户速率的影响 低速率小区优化专项 ——思路 调度算法研究 ——机制和参数 左图是eNodeB内部下行调度的示意图。 影响速率的因素： －基带硬件容量和license容量 －UE上报的CQI（Channel Quality Index）和RI（Rank Indicator） －传输模式：MIMO，TxD，SIMO －选择的MCS，分配的PRB和选择的TBS －UE被调度的频率 －CFI（PDCCH使用的symbol数） －HARQ，MAC层重传 －RLC层重传 －UE能力，测量的间隔和同步状态 －下行功率使用情况 调度算法研究 ——机制和参数 EUtranCellFDD dlChannelBandwidth / ulChannelBandwidth （20000 kHz） transmissionMode TxDiv and Open Loop Spatial Multiplexing (2x2 MIMO) （3， TRANSMISSION_MODE_3 ） pdcchCfiMode number of OFDM symbols used for PDCCH, 1-3 （4， CFI_AUTO_MAXIMUM_2 ） pZeroNominalPucch ? some UEs need this to be increased or ACK/NACKs are not received successfully on PUCCH. Note this recommended value has changed from releases （-96/-103 dBm） pZeroNominalPusch ? some UEs need this to be increased from default or lots of errors seen on PUSCH. Note this recommended value has changed from releases (-60/-75 dBm) SectorCarrier noOfTxAntennas ? controls whether OLSM MIMO is used or not. (2) maximumTransmissionPower ? for all Tx in all references sectors (490 dBm) partOfSectorPower (100%) SectorEquipmentFunction configuredOutputPower /(The requested/configured maximum sector power) (80000 mW) availableSectorPower (The actual available sector power) DataRadioBearer Various parameters for RLC status reporting and retransmission. Should be set to recommended values. MACConfiguration Various parameters for MAC status reporting and retransmission. Should be set to default values or values as Release note documentation 调度算法研究 ——机制和参数 QciProfilePredefined dlResourceAllocationStrategy Defines the downlink resource allocation strategy of the QoS Class Identifier (QCI). (0, RESOURCE_FAIR) priority Quality of Service Class Indicator (QCI)-related priority as defined in 3GPP TS 23.203 (Release 8). resourceAllocationStrategy De