Operator E CA(Carrier Aggregation) Feature Test Guide.docx
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This document provides a test guide for carrier aggregation (CA) features on Operator E's LTE network. It describes introducing multiple component carriers to expand bandwidth up to 100MHz. The test uses three carriers in different bands to test downlink carrier aggregation of up to 60MHz. Key steps included configuring the core network to allow high bandwidth, setting up the radio network for contiguous and non-contiguous carriers, verifying UE capabilities, and monitoring throughput results. Testing showed throughput increases with CA and supported band combinations depending on the UE model.
Operator E CA(Carrier Aggregation) Feature Test Guide.docx
- 1. 文档名称 文档密级 2023-5-3 华为保密信息,未经授权禁止扩散 第 1 页, 共 7 页 Operator E LTE CA (Carrier Aggregation) Feature Test Guide 1 Feature Introduction 3GPP requires that LTE-Advanced networks provide a downlink peak data rate of 1 Gbit/s. However, due to the limited bandwidth of a single carrier, the 1 Gbit/s data rate requirement is hard to meet. To deal with this situation, 3GPP Release 10 introduced carrier aggregation (CA) for LTE-Advanced networks. CA allows aggregation of contiguous or non-contiguous component carriers (CCs) to expand bandwidth to up to 100 MHz. Related Concept: PCell A primary serving cell (PCell) is a cell on which a CA UE camps. In the PCell, the CA UE works in the same way as it does in a 3GPP Release 8 or Release 9 cell. The physical uplink control channel (PUCCH) of the UE exists only in the PCell. SCell A secondary serving cell (SCell) is a cell that an eNodeB configures for a CA UE through an RRC Connection Reconfiguration message. This cell works at a different frequency than the PCell and provides the CA UE with more radio resources. In an SCell, there can be only downlink transmission or both downlink and uplink transmission. CC Component carriers (CCs) are the carriers that are aggregated for a CA UE. PCC The primary component carrier (PCC) is the carrier of the PCell. SCC A secondary component carrier (SCC) is the carrier of an SCell. 3GPP defined CA Band combination (refer to 3GPP TR 36.101 section 5.5). 2 Operator E Test Situation Three carriers are ready for test. Band Bandwidth DL EARFCN Band 1 20MHz 300 Band 3 20MHz 1600 Band 3 20MHz 1800 License requirement Feature ID Feature Name Model License Control Item LAOFD- 001001 LTE-A Introduction LT1SA020CA00 LTE-A Introduction(FDD)
- 2. 文档名称 文档密级 2023-5-3 华为保密信息,未经授权禁止扩散 第 2 页, 共 7 页 LAOFD- 001002 Carrier Aggregation for Downlink 2CC in 40MHz LT1SA040CA00 Carrier Aggregation for Downlink 2CC in 40MHz(FDD) LAOFD- 080208 Carrier Aggregation for Downlink 3CC in 60MHz LT1SCAD60M00 Carrier Aggregation for Downlink 3CC in 60MHz(FDD) LAOFD- 070201 Flexible CA from Multiple Carriers LT1SCAD2MC00 Flexible CA from Multiple Carriers(FDD) 3 Test Preparation 3.1 CN Configuration For CA test, the maximum bit rate that the UE subscribes to in the EPC must be more than below Number of Carriers 2x2 MIMO + 64QAM 2 300Mbps 3 450Mbps Check UE-AMBR, we found it was set to 160000000, not enough to test CA, changed it to 1010000000 finally. 3.2 eRAN Configuration 3.2.1 Contiguous Carriers and Non-contiguous Carriers Intra-band CA include contiguous carriers and non-contiguous carriers. 3GPP(TR 36.101 section 5.7.1A) requires that the nominal channel spacing between the center frequencies of two intra-band contiguous CCs be an integer multiple of 300 kHz. For Operator E, there are two carriers in band 3. If DL EARFCN is set to 1600 and 1800, channel space is 20MHz, it is non-contiguous carriers; if DL EARFCN is set to 1600 and 1798, channel space is 19.8MHz, it is contiguous carriers.
- 3. 文档名称 文档密级 2023-5-3 华为保密信息,未经授权禁止扩散 第 3 页, 共 7 页 3.2.2 eRAN parameters and command Huawei eNodeB support two configuration modes: CA-group-based and adaptive CA. We choose adaptive CA for Operator E. 1. Setting the options of the CA algorithm switch: MOD ENODEBALGOSWITCH:CAALGOSWITCH=FreqCfgSwitch- 1&HoWithSccCfgSwitch-1&SccModA6Switch-1&AdpCaSwitch- 1&EnhancedPccAnchorSwitch-1; 2. Adding candidate PCCs and setting their attributes, choose one carrier of them or all carriers of them as PCC: ADD PCCFREQCFG:PCCDLEARFCN=***,PREFERREDPCCPRIORITY=***,PCCA4RSRPT HD=***,PCCA4RSRQTHD=***; 3. Adding a candidate SCC for each candidate PCC and setting SCC attributes, set all others carriers as SCC: ADD SCCFREQCFG:PCCDLEARFCN=***,SCCDLEARFCN=***,SCCPRIORITY=***,SCC A2OFFSET=***,SCCA4OFFSET=***; 4. Setting blind-configurable candidate SCells (ensure that the two cells have been configured as inter-frequency neighboring cells of each other): ADD CAGROUPSCELLCFG:LOCALCELLID=***,SCELLENODEBID=***,SCELLLOCALC ELLID=***,SCELLBLINDCFGFLAG=TRUE; 5. Set inter-frequency neighbor cell between PCC cell and SCC cell. 6. 2CC total bandwidth is more than 20MHz, CaDl2CCExtSwitch should switch on; 3CC total bandwidth is more than 40MHz, CaDl3CCExtSwitch should switch on MOD CAMGTCFG:LOCALCELLID=***, CELLCAALGOSWITCH=CaDl2CCExtSwitch-1&CaDl3CCSwitch-1; 7. If more than one SCC cells is set to PCC cell, MultiCarrierFlexCaSwitch should be
- 4. 文档名称 文档密级 2023-5-3 华为保密信息,未经授权禁止扩散 第 4 页, 共 7 页 switched on, otherwise eNodeB only select a limited number of frequencies based on the SCC priorities: MOD CAMGTCFG:LocalCellId=***,CellCaAlgoSwitch=MultiCarrierFlexCaSwitch-1; 3.2.3 CA UE capability Check message “RRC_UE_CAP_INFO” from Signaling Trace or connect UE to Probe, we can find what band combination that UE support. (below message shows the UE support Band3a, means non-contiguous carriers in Band3) Or output CA UE Capability directly with FMA. It shows the UE support both Band3a and Band3c in below table, Band3c means contiguous carriers in Band3.
- 5. 文档名称 文档密级 2023-5-3 华为保密信息,未经授权禁止扩散 第 5 页, 共 7 页 Base on test UE capability to set channel frequency. 4 Test Result 4.1 Feature Activation Observation 4.1.1 Counter Observe the counters for PCell and SCell statistics. If the L.ChMeas.PRB.DL.PCell.Used.Avg, L.ChMeas.PRB.DL.SCell.Used.Avg, L.Traffic.User.SCell.DL.Avg, L.ChMeas.PRB.DL.SCell.Used.Avg counters produce non-zero values, the CA feature has been activated successfully. 4.1.2 Signaling Trace Check the tracing results for the message “RRC_CONN_RECFG”. The eNodeB configures or removes an SCell for the CA UE that contains the IE sCellToAddModList or sCellToReleaseList,
- 6. 文档名称 文档密级 2023-5-3 华为保密信息,未经授权禁止扩散 第 6 页, 共 7 页 4.1.3 Throughput Monitoring Choose Trace Type > LTE > User Performance Monitoring > Throughput Monitoring on U2000 client, there will be CA PCell and CA SCell throughput result. You should get MMEc and mTMSI in advance, Get it from message “S1AP_INITIAL_UE_MSG” of signaling trace. Or run command “DSP ALLUEBASICINFO” on U2000 or LMT.
- 7. 文档名称 文档密级 2023-5-3 华为保密信息,未经授权禁止扩散 第 7 页, 共 7 页 4.2 Test Result UE Model CA Band Combination Bnadwidth Speedtest Throughput Mate 30 Band3a+Band3a 20M+20M 250Mbps Mate 30 Band3a+Band3a 20M+15M 230Mbps Mate 20 Band3a+Band3a 20M+20M 258Mbps Mate 20 Band3a+Band3a 20M+15M 231Mbps Mate 8 Band3c 20M+20M 232Mbps iphone 11 Pro Band3a+Band3a 20M+20M 265Mbps iphone 11 Pro Band3c 20M+20M 267Mbps All test UEs don’t support band3+band1 CA or 3CC. 4.3 CA UE Proportion in Operator E Network Collect MR with UE_CAPABILITY_INFORMATION, analyze it with SmartCAPEX in WINSCloud or other tools, we can get MR proportion of CA UE capability. CA Band Combination MR Proportion 2CC-Band 3c 8.1% 2CC-Band 3a+Band 3a 5.7% 2CC-Band 1a+Band 3a 1.2% 3CC-Band 1a+Band 3c 0.05%