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Lte capacity monitoring

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Lte capacity monitoring

  1. 1. HUAWEI TECHNOLOGIES CO., LTD. Security Level: LTE Capacity Monitoring
  2. 2. Page 2HUAWEI TECHNOLOGIES CO., LTD. Monitoring Principle Measurement Formula Monitoring Threshold Impact Proposed solution Resource block utilization DL RB Utilization L.ChMeas.PRB.DL.Used.Avg/L.ChM eas.PRB.DL.Availx100% DL RB Utilization >70% & DL User Throughput < 2Mbps User may failed in admission or poor user experience 1. Add eNodeB 2. Bandwidth expansion DL User throughput L.Thrp.bits.DL/L.Thrp.Time.DL/1000 UL RB Utilization L.ChMeas.PRB.UL.Used.Avg/L.ChM eas.PRB.UL.Availx100% UL RB Utilization >70% & UL User Throughput < 512kbps User may failed in admission or poor user experience 1. Add eNodeB 2. Bandwidth expansion UL User throughput L.Thrp.bits.UL/L.Thrp.Time.UL/1000 RRC connected users per cell (BBU board specification) Synchronized User Utilization L.Traffic.User.Avg/1200*100% (Max num user handled in a cell for LBBPd is 1200) 60% Poor user experience 1. Reduce UE inactivity timer in eNodeB (MOD RRCCONNSTATETIMER). Please note that load in CPU will increase if timer value reduce. 2. Physical tuning by balancing the target serving area for all cells 3. Add cell Preamble usage for random access Random Preamble Utilization (L.RA.GrpA.Att+L.RA.GrpB.Att) /3600/N* 100% (N is a value from product design in considering probability of preamble conflict, N is 50.) 75% Access delayed or failure 1. Enable resource adjustment algo (MOD CELLALGOSWITCH: LocalCellId=xx, RachAlgoSwitch=RachAdjSwitch-1;) 2. Enable adaptive backoff function to allow UE retransmit preamble after failure (MOD CELLALGOSWITCH: LocalCellID=xx, RachAlgoSwitch=BackOffSwitch-1;) Dedicated Preamble Utilization L.RA.Dedicate.Att/3600/100*100% 75% Access delayed or failure 1. Enable resource adjustment algo & reuse dedicated preamble (MOD CELLALGOSWITCH: LocalCellId=xx, RachAlgoSwitch=RachAdjSwitch-1, RachAlgoSwitch=MakeIdxSwitch;) Control channel element for PDCCH CCE Utilization (L.ChMeas.CCE.CommUsed + L.ChMeas.CCE.ULUsed + L.ChMeas.CCE.DLUsed)/L.ChMeas. CCE.Avail 70% Scheduling delayed or poor user experience 1. Add cell LTE Capacity Monitoring Summary
  3. 3. Page 3HUAWEI TECHNOLOGIES CO., LTD. LTE Capacity Monitoring Summary Monitoring Principle Measurement Formula Monitoring Threshold Impact Proposed solution Maximum allowed connected users per eNodeB RRC Connected User Utilization Sum (L.Traffic.User.Avg of all cells)/Licensed RRC connected users*100% 60% User may failed in admission or poor user experience 1. Increase license RRC (if CPU board usage <60%) 2. Add eNB (if CPU board usage >60%) Traffic volume utilization per eNodeB Traffic Volume Utilization Sum of (L.Thrp.bits.UL + L.Thrp.bits.DL) all cells / (Traffic License*3600) /(1000*1000)*100% 80% Poor user experience 1. Increase Traffic volume license Paging message processing capability (eNodeB specification) Paging Utilization Sum of (L.Paging.S1.Rx) all cells /3600/750 *100% 60% Poor user experience 1. Reduce num cells in tracking area list 2. Paging policy (core network) optimization Main control board processing capability Main Control Board Usage VS.BBUBoard.CPULoad.Mean 60% Poor user experience 1. Physical tuning to achieve load balancing between neighbour (if neighbour is lightly loaded) 2. Change UMPT board (if LMPT is used) 3. Add eNB% of Main Control Board Usage exceeed threshold VS.Board.CPULoad.Cumulative HighloadCount/(3600/5)*100% 5% Baseband board processing capability Main Control Board Usage VS.BBUBoard.CPULoad.Mean 60% Poor user experience 1. Add LBBP to share load 2. Move cells or add cells based on num of UEs 3. If already reached 6 LBBPs, add eNB% of Main Control Board Usage exceeed threshold VS.Board.CPULoad.Cumulative HighloadCount/(3600/5)*100% 5% Transmission rate at Ethernet port DL Transmission Utilization VS.FEGE.RxMeanSpeed/Allocat ed bandwidth x 100% 70% Poor user experience 1. Transmission capacity expansion UL Transmission Utilization VS.FEGE.TxMeanSpeed/Allocat ed bandwidth x 100% 70%
  4. 4. Page 4HUAWEI TECHNOLOGIES CO., LTD. ERAN Resource eNodeB Ethernet port Transport resource group LBBP CPU Main-control- board CPU Paging Resource Traffic Volume License Connected user license cell PDCCH resource PRACH resource Synchronized user capacity Physical resource block
  5. 5. Page 5HUAWEI TECHNOLOGIES CO., LTD. eNode B Resource Resource Connected user license Meaning The connected user license specifies the maximum permissible number of users in RRC_CONNECTED mode. Each connected user consumes radio, device, and transport resources. If there are too many connected users, they cannot be well served by the eNodeB and new services cannot be admitted. Counter L.Traffic.User.Avg : indicates the average number of connected users in a cell. SUM (L.Traffic.User.Avg) indicates the sum of the average number of connected users in all cells in an eNodeB The licensed number of connected users under an eNodeB can be queried by running the following command: DSP LICENSE: FUNCTIONTYPE=eNodeB; In the command output, the value of LLT1ACTU01 in the Allocated column is the licensed number of connected users Monitoring Method Connected user license usage = SUM (L.Traffic.User.Avg)/Licensed number of connected users x 100% Threshold 60% Impact New services cannot be admitted, and experience of admitted users is affected. SW/HW SW Solution If the main-control-board CPU usage is less than 60%, increase the licensed limit. If the main-control-board CPU usage reaches or exceeds 60%, add an eNodeB.
  6. 6. Page 6HUAWEI TECHNOLOGIES CO., LTD. eNode B Resource Resource Traffic volume license Meaning When the traffic volume of an eNodeB reaches or exceeds the licensed volume, the eNodeB performs flow control, which affects user experience and customer income. Counter L.Thrp.bits.UL & L.Thrp.bits.DL: indicate the uplink traffic volume and downlink traffic volume of a cell, respectively. Σ(L.Thrp.bits.UL+L.Thrp.bits.DL) indicates the sum of uplink and downlink traffic volume of all cells under an eNodeB The licensed eNodeB traffic volume can be queried by running the following command: DSP LICENSE: FUNCTIONTYPE=eNodeB; The licensed eNodeB traffic volume is equal to the Allocated parameter value in the record whose License Identifier is LLT1THRUL01. Monitoring Method Traffic volume license usage of an eNodeB = Σ(L.Thrp.bits.UL+L.Thrp.bits.DL)/(Licensed eNodeB traffic volume x 3600) x 100% Threshold 80% Impact User experience and customer income are affected. SW/HW SW Solution Increase the licensed traffic volume.
  7. 7. Page 7HUAWEI TECHNOLOGIES CO., LTD. eNode B Resource Resource Paging Resource Meaning The eNodeB and BTS3202E or BTS3203E LTE can process a maximum of 750 and 500 paging messages per second, respectively. If the number of paging messages exceeds that capacity, paging messages sent from the eNodeB to UEs may be discarded, which leads to a decrease in the call completion rate. Counter L.Paging.S1.Rx :indicates the number of paging messages received over the S1 interface L.Paging.Dis.Num : indicates the number of paging messages discarded over the Uu interface Monitoring Method Percentage of paging messages received over the S1 interface = L.Paging.S1.Rx/3600/Maximum number of paging messages that can be processed per second x 100% Threshold Percentage of paging messages received over the S1>60% (or) L.Pagind.Dis.Num >1500 Impact Paging messages may be lost, affecting user experience. SW/HW SW Solution Decrease the number of cells in the tracking area list (TAL) that the congested cell belongs to. Adjust the paging policy of the core network to reduce signaling overhead. If the core network is provided by Huawei, enable the precise paging function.
  8. 8. Page 8HUAWEI TECHNOLOGIES CO., LTD. eNode B Resource Resource Main-control-board CPU Meaning The CPU usage reflects the busy level of the eNodeB. If the main-control-board CPUs are busy processing control plane or user plane data, signaling-related KPIs may deteriorate, and users may experience a low access success rate, low E-RAB setup success rate, or high service drop rate. Counter VS.Board.CPUload.Mean : indicates the average main-control-board CPU usage VS.Board.CPULoad.CumulativeHighloadCount : indicates the number of times that the main-control-board CPU usage reaches or exceeds a preconfigured threshold. Monitoring Method Percentage of times that the main-control-board CPU usage reaches or exceeds a preconfigured threshold (85%) = VS.Board.CPULoad.CumulativeHighloadCount/(3600/5) x 100% Threshold Percentage of times that the main-control-board CPU usage reaches or exceeds a preconfigured threshold (85%) >5% (or) VS.Board.CPUload.Mean >60% Impact KPIs deteriorate. SW/HW HW Solution If a neighboring eNodeB is lightly loaded, adjust the antenna downtilt angles or decrease the transmit power of the local eNodeB to shrink the coverage area and reduce the CPU load of the local eNodeB. In addition, expand the coverage area of the neighboring eNodeB for load balancing. If the main control board is an LMPT, replace it with a UMPT. Add eNodeBs.
  9. 9. Page 9HUAWEI TECHNOLOGIES CO., LTD. eNode B Resource Resource LBBP CPU Meaning If the eNodeB receives too much traffic volume, which is expressed either in bit/s or packet/s, the LBBP CPU responsible for user plane processing is heavily loaded. As a result, the eNodeB has a low RRC connection setup success rate, low E-RAB setup success rate, low handover success rate, and high service drop rate. Counter VS.Board.CPUload.Mean : indicates the average LBBP CPU usage VS.Board.CPULoad.CumulativeHighloadCount : indicates the number of times that the LBBP CPU usage reaches or exceeds a preconfigured threshold. Monitoring Method Percentage of times that the LBBP CPU usage reaches or exceeds a preconfigured threshold (85%) = VS.Board.CPULoad.CumulativeHighloadCount/(3600/5) x 100% Threshold Percentage of times that theLBBP CPU usage reaches or exceeds a preconfigured threshold (85%) >5% (or) VS.Board.CPUload.Mean >60% Impact KPIs deteriorate. SW/HW HW
  10. 10. Page 10HUAWEI TECHNOLOGIES CO., LTD. eNode B Resource Solution If the LBBP is an LBBPc, replace the LBBPc with an LBBPd Add an LBBP to share the network load, and then determine whether to move existing cells or add new cells based on the number of UEs. The capacity expansion methods are as follows: − If the radio resources are sufficient (that is, the usage of each type of radio resources is lower than the threshold), move cells from the existing LBBP to the new LBBP. - If the radio resources are insufficient, set up new cells on the new LBBP If the eNodeB has multiple LBBPs and one of them is overloaded, move cells from the overloaded LBBP to an LBBP with a lighter load. LBBP load can be indicated by the following: − Average CPU usage − Percentage of times that the CPU usage reaches or exceeds a preconfigured threshold − Number of cells established on an LBBP If the eNodeB already has a maximum of six LBBPs and more LBBPs are required, add an eNodeB.
  11. 11. Page 11HUAWEI TECHNOLOGIES CO., LTD. eNode B Resource Resource Transport Resource Group Meaning A transport resource group carries a set of data streams, which can be local data or forwarded data. Local data is classified into control plane, user plane, operation and maintenance (OM), and IP clock data. Forwarded data is not divided into different types. If a transport resource group is congested, it cannot transmit or forward data, which affects service provision. A transport resource group for user plane data is a monitored object. Counter VS.RscGroup.TxMeanSpeed : indicates the average transmission rate of a transport resource group VS.RscGroup.TxMaxSpeed indicates the maximum transmission rate of a transport resource group The bandwidth configured for a transport resource group can be queried by running the following command: DSP RSCGRP: CN=x, SRN=x, SN=x, BEAR=xx, SBT=xxxx, PT=xxx; In the command output, the value of Tx Bandwidth is the bandwidth configured for the transport resource group. Monitoring Method Proportion of the average transmission rate to the configured bandwidth = VS.RscGroup.TxMeanSpeed/Bandwidth configured for the transport resource group x 100% Proportion of the maximum transmission rate to the configured bandwidth = VS.RscGroup.TxMaxSpeed/Bandwidth configured for the transport resource group x 100% Threshold Mean > 80 in 5days a week, Max >90 in 2 days a week Impact Packets may be lost, affecting user experience. SW/HW SW Solution When a transport resource group is congested, you are advised to expand the bandwidth of the transport resource group
  12. 12. Page 12HUAWEI TECHNOLOGIES CO., LTD. eNode B Resource Resource Ethernet port Meaning The Ethernet port traffic is the channel traffic at the physical layer, including uplink and downlink traffic. The eNodeB Ethernet port traffic reflects the throughput and communication quality of the Ethernet ports on the main control board of the eNodeB. Based on the monitoring results, you can determine whether the transmission capacity allocated by an operator for the S1 and X2 interfaces on the eNodeB meet the requirements for uplink and downlink transmissions. Counter VS.FEGE.TxMeanSpeed : indicates the average transmission rate of an Ethernet port VS.FEGE.TxMaxSpeed indicates the maximum transmission rate of an Ethernet port VS.FEGE.RxMeanSpeed indicates the average reception rate of an Ethernet port VS.FEGE.RxMaxSpeed indicates the maximum reception rate of an Ethernet port. Monitoring Method Proportion of the average uplink transmission rate to the allocated bandwidth = VS.FEGE.TxMeanSpeed/Allocated bandwidth x 100% Proportion of the maximum uplink transmission rate to the allocated bandwidth = VS.FEGE.TxMaxSpeed/Allocated bandwidth x 100% Proportion of the average downlink reception rate to the allocated bandwidth = VS.FEGE.RxMeanSpeed/Allocated bandwidth x 100% Proportion of the maximum downlink reception rate to the allocated bandwidth = VS.FEGE.RxMaxSpeed/Allocated bandwidth x 100% Threshold Proportion of average transmission rate to allocated bandwidth ≥ 70% or Proportion of max transmission rate to allocated bandwidth ≥ 85% Impact Packets may be lost, affecting user experience. SW/HW SW Solution Expand the eNodeB transmission capacity.
  13. 13. Page 13HUAWEI TECHNOLOGIES CO., LTD. ERAN Resource eNodeB Ethernet port Transport resource group LBBP CPU Main-control- board CPU Paging Resource Traffic Volume License Connected user license cell PDCCH resource PRACH resource Synchronized user capacity Physical resource block
  14. 14. Page 14HUAWEI TECHNOLOGIES CO., LTD. Cell Resource Resource Physical Resource Block (PRB) Meaning Growing traffic leads to a continuous increase in PRB usage. When the PRB usage approaches to 100%, user-perceived rates will decrease. As downlink is a major concern in an LTE network, this document describes only how to monitor downlink user perception. Counter L.ChMeas.PRB.DL.Used.Avg : indicates the average number of used downlink PRBs L.ChMeas.PRB.DL.Avail : indicates the number of available downlink PRBs L.Thrp.bits.DL : indicates the total throughput of downlink data transmitted at the PDCP layer in a cell. L.Thrp.Time.DL indicates the duration for transmitting downlink data at the PDCP layer in a cell Monitoring Method Downlink PRB usage = L.ChMeas.PRB.DL.Used.Avg/L.ChMeas.PRB.DL.Avail x 100% Downlink user-perceived rate (Mbit/s) = L.Thrp.bits.DL/L.Thrp.Time.DL/1000 Threshold Downlink PRB usage ≥ 70% Downlink user-perceived rate < a user-defined threshold (default value: 2 Mbit/s) Impact Users may fail to be admitted, and experience of admitted users is affected. SW/HW SW Solution If the cell spectral efficiency is low, you are advised to increase the cell throughput by optimizing RF performance If the cell spectral efficiency is high, you are advised to: − Add carriers or expand the bandwidth of the existing carrier. − Add eNodeBs.
  15. 15. Page 15HUAWEI TECHNOLOGIES CO., LTD. Cell Resource Resource Synchronized user capacity Meaning When the number of synchronized users in a cell reaches or exceeds a preconfigured threshold, cell KPIs deteriorate. Connected users include synchronized users and users in the out-of-synchronization state. Synchronized users consume air interface resources and the number of synchronized users is approximately equal to the number of connected users by default. Therefore, the number of connected users (instead of synchronized users) is monitored. Counter L.Traffic.User.Avg indicates the average number of connected users in a cell. Monitoring Method Synchronized user capacity usage of a cell = L.Traffic.User.Avg/Maximum number of synchronized users in a cell x 100% Threshold 60% Impact User experience is affected. SW/HW HW Solution Reduce the UE inactivity timer length by running the MOD RRCCONNSTATETIMER command with the UeInactiveTimer parameter specified. This measure lifts signaling overhead and increases CPU usage. If a neighboring cell is lightly loaded, adjust the antenna downtilt angle or decrease the transmit power of the local cell to shrink the coverage area and reduce the number of users in the local cell. In addition, expand the coverage area of the neighboring cell for load balancing. Add cells or expand the cell bandwidth. Split the local cell into multiple cells.
  16. 16. Page 16HUAWEI TECHNOLOGIES CO., LTD. Resource Physical random access channel (PRACH) resource Meaning The PRACH transmits preambles during random access procedures. If the number of contention-based random access attempts in a second reaches or exceeds N, the preamble conflict probability and access delay increase. The values of N are determined during preamble design, considering factors such as that the preamble conflict probability should be less than 1%. If more than 100 non-contention-based random access attempts are initiated per second, dedicated preambles will become insufficient and the eNodeB will instruct the UE to initiate contention-based random access instead, increasing the access delay for the UE. In handover scenarios, the handover procedure is prolonged. Counter L.RA.GrpA.Att indicates the number of times that random preambles in group A are received. L.RA.GrpB.Att indicates the number of times that random preambles in group B are received. L.RA.Dedicate.Att indicates the number of times that dedicated preambles are received Monitoring Method Random preamble usage = (L.RA.GrpA.Att + L.RA.GrpB.Att)/3600/N x 100% Dedicated preamble usage = L.RA.Dedicate.Att/3600/100 x 100% Threshold Usage of preambles for contention-based access ≥ 75% Impact Access delays are prolonged, or even access attempts fail. SW/HW SW Solution - If the random preamble usage reaches or exceeds 75% for X days (three days by default) in a week, enable the adaptive backoff function. If the system bandwidth is 5 MHz or 10 MHz, it is good practice to enable the PRACH resource adjustment algorithm - If the dedicated preamble usage reaches or exceeds 75% for X days (three days by default) in a week, enable the PRACH resource adjustment algorithm and reuse of dedicated preambles Cell Resource
  17. 17. Page 17HUAWEI TECHNOLOGIES CO., LTD. Resource PDCCH Resource Usage Meaning This capacity indicator measures the number of control channel elements (CCEs) that can be used by the PDCCH. In each radio frame, CCEs must be allocated to uplink and downlink UEs to be scheduled and common control signaling. PDCCH CCEs must be properly configured and allocated to minimize downlink control overheads as well as to ensure satisfactory user-plane throughput. Counter L.ChMeas.CCE.CommUsed indicates the number of PDCCH CCEs used for common signaling. L.ChMeas.CCE.ULUsed indicates the number of PDCCH CCEs used for uplink scheduling. L.ChMeas.CCE.DLUsed indicates the number of PDCCH CCEs used for downlink scheduling. L.ChMeas.CCE.Avail indicates the number of available PDCCH CCEs. Monitoring Method CCE usage = (L.ChMeas.CCE.CommUsed + L.ChMeas.CCE.ULUsed + L.ChMeas.CCE.DLUsed)/3600/1000/Max number of PDCCH CCEs x 100% Threshold 80% Impact - If PDCCH symbols are insufficient, CCEs may fail to be allocated to UEs to be scheduled, which will result in a long service delay and unsatisfactory user experience. - If PDCCH symbols are excessive, which indicates that the usage of PDCCH CCEs is low, the resources that can be used by the PDSCH decreases. This will also result in low spectral efficiency. SW/HW SW Solution If the PDCCH Symbol Number Adjust Switch parameter value is Off, you are advised to set this parameter to On If the PDCCH Symbol Number Adjust Switch parameter value is set to On and the uplink or downlink PRB usage reaches or exceeds 70%, you are advised to take one of the following measures: - Add cells or split existing cells. − Optimize RF performance to reduce the interference to PDCCH from neighboring cells. Cell Resource
  18. 18. Page 18HUAWEI TECHNOLOGIES CO., LTD. References - LBBP Board Number of Cells Cell Bandwidth Antenna Configuration LBBPc 3 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz 3x20 MHz 1T1R 3x20 MHz 1T2R 3x10 MHz 4T4R 3x20 MHz 2T2R 1x20 MHz 4T4R LBBPd1 3 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz 3x20 MHz 1T1R 3x20 MHz 1T2R 3x20 MHz 2T2R LBBPd2 3 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz 3x20 MHz 1T1R 3x20 MHz 1T2R 3x20 MHz 2T2R 3x20 MHz 4T4R LBBPd3 6 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz 6x20 MHz 1T1R 6x20 MHz 1T2R 6x20 MHz 2T2R a a: When a CPRI fiber optic cable is longer than 40 km (24.85 mi), the LBBPd3 board cannot support the 6x20 MHz 2T2R channel. Board Signaling Specification (CAPS) LBBPc 30 LBBPd1, LBBPd2, LBBPd3, and LBBPd4 60 Board Cell Bandwidth Maximum Number of UEs in RRC Connected Mode LBBPc 1.4 MHz 1008 3 MHz 1800 5 MHz 1800 10 MHz 1800 15 MHz 1800 (in 2R mode) or 1200 (in 4R mode) 20 MHz 1800 (in 2R mode) or 1200 (in 4R mode) LBBPd1/LBBPd2 1.4 MHz 504 3 MHz 1080 5 MHz 1800 10 MHz 3600 15 MHz 3600 20 MHz 3600 LBBPd3 1.4 MHz 1008 3 MHz 2160 5 MHz 3600 10 MHz 3600 15 MHz 3600 20 MHz 3600 Board Maximum Throughput LBBPc Downlink: 300 Mbit/s Uplink: 100 Mbit/s LBBPd1 Downlink: 450 Mbit/s Uplink: 225 Mbit/s LBBPd2 Downlink: 600 Mbit/s Uplink: 225 Mbit/s LBBPd3 Downlink: 600 Mbit/s Uplink: 300 Mbit/s LBBPd4 Downlink: 600 Mbit/s Uplink: 225 Mbit/s Antenna Config Throughput Signalling RRC Connected Mode
  19. 19. Page 19HUAWEI TECHNOLOGIES CO., LTD. References - LBBP RACH algorithm switch Bandwidth N - 15,20 100 Enable 5,10 100 Disable 5,10 50 PRACH PDCCH
  20. 20. Thank you www.huawei.com Copyright©2011 Huawei Technologies Co., Ltd. All Rights Reserved. The information in this document may contain predictive statements including, without limitation, statements regarding the future financial and operating results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and developments to differ materially from those expressed or implied in the predictive statements. Therefore, such information is provided for reference purpose only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time without notice.

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