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11/7/2017
Cell Outage Detection and Recovery
Cell Outage Detection and Recovery Contents 9.1.4 Cell Outage Detection and Recovery
U2000 V200R016C10
Feature Description About Cell Outage Detection and Recovery
Issue
01
Date
2016-02-25
HUAWEI TECHNOLOGIES CO., LTD.
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Copyright © Huawei Technologies Co., Ltd. 2016. All rights reserved. No part of this d document ocument ma may y be rep reproduced roduced or transmi transmitted tted in an any y form or by any m means eans with without out prio prior r written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation prepara tion of th this is docume document nt to ens ensure ure accu accuracy racy of tthe he conten contents, ts, but aall ll statemen statements, ts, information, information, an and d recommendations in this document do not constitute a warranty of any kind, express or implied.
Huawei Technologies Co., Ltd. Address:
Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China
Website:
http://www.huawei.com
Email:
[email protected]
Contents 1 Introduction 1.1 Scope 1.2 Site Type Difference 1.3 Intended Audience 1.4 Change History http://localhost:7890/printtopics. http://localhost :7890/printtopics.html?time=T html?time=Tue%20Nov%2007%20201 ue%20Nov%2007%202017%2020:15:29%20GMT+ 7%2020:15:29%20GMT+0800%20(Malay%20P 0800%20(Malay%20Peninsula%20Standard%2 eninsula%20Standard%20Time) 0Time)
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2 Overview
2.1 Definition 2.2 Benefits 2.3 Functions 3 Cell Outage Detection Techniques 3.1 Possible Causes of Cell Outage 3.2 Cell Outage Detection 3.2.1 Cell Outage Detection Based on an Alarm 3.2.2 Cell Outage Detection Based on a Sleeping Cell 3.2.3 Cell Outage Detection Based on an Abnormal KPI 3.2.4 Cell Outage Detection Based on an Internal Audit by eNodeBs 3.3 Service Adjustment for Outage Cells 3.4 Restoration of Outage Cells and RRUs 3.5 Suggestions on Handling Cell Outage 3.6 Related Features 3.7 Network Impact 4 Engineering Guidelines 4.1 Preparation 4.2 Required Information 4.3 Planning 4.4 Deployment 4.5 Deployment of the Cell Outage Management Feature 4.5.1 Process 4.5.2 Requirements 4.5.3 Precautions 4.5.4 Hardware Adjustment 4.5.5 Initial Configuration 4.5.6 Activation Observation 4.5.7 Deactivation 4.6 Maintenance 4.7 Troubleshooting 5 Parameters 6 Counters 7 Reference Documents
1
Introduction
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1.1 Scope This document describes the Cell Outage Management feature, including principles and functions. It also describes how to configure related parameters. Any managed objects (MOs), parameters, alarms, or counters described in this document correspond to the latest software release delivered with this document. In the event of updates, the updates will be described in the product documentation delivered with the latest software release.
1.2 Site Type Difference Cell outage detection Pico base stations do not support GSM cell outage detection.
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Outage cell restoration
Pico base stations do not support outage RRU restoration, and baseband board resetting. l
Log collection
Pico base stations do not support log collection.
1.3 Intended Audience This document is intended for personnel who: l
l
Need to understand the Cell Outage Management Man agement feature Work with Huawei products
1.4 Change History This section provides information about the changes in different document versions. There are two types of changes, which are defined as follows: Feature change: refers to a change in the sleeping cell detection and the Cell Outage Management feature of a specific product version.
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Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.
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01 (2016-02-25) This is the first release for V200R016C10. Compared with issue Draft A (2015-12-30) of V200R016C10, this issue does not include any changes. Draft A (2015-12-30) This is the Draft A release for V200R016C10. Compared with issue 01 (2015-09-20) of V200R016C00, this issue does not include any changes.
2
Overview
This chapter provides an overview of Cell Outage Management. A cell may fail to provide services properly because of issues such as environmental changes, network element (NE) hardware or software faults, and user misoperations. In this situation, network performance and quality of service (QoS) deteriorate notably. To prevent this problem, networks must be monitored in real time to detect sleeping cells and outage cells. http://localhost:7890/printtopics. http://localhost :7890/printtopics.html?time=T html?time=Tue%20Nov%2007%20201 ue%20Nov%2007%202017%2020:15:29%20GMT+ 7%2020:15:29%20GMT+0800%20(Malay%20P 0800%20(Malay%20Peninsula%20Standard%2 eninsula%20Standard%20Time) 0Time)
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The system determines that cells are in outage by using multiple detection methods. It also provides functions of restoring and adjusting these outage cells.
Pico base stations does not support log collection. The Cell Outage Management feature involves the following optional features: l
Feature on the NE side:
−
LOFD-002012 Cell Outage Detection and Compensation
−
PLBFD-009001 Self-healing
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Features on the element management system (EMS) side: WOFD-171000 Cell Outage Detection and Recovery - LTE
−
WOFD-171200 Cell Outage Detection and Recovery - GBSS
−
WOFD-171300 Cell Outage Detection and Recovery - WRAN
2.1 Definition This section provides the definition related to the Cell Outage Management feature. Cell outage refers to the situation in which services are inaccessible or key performance indicators (KPIs) decrease greatly because of cell faults or alarms. It has huge impacts on the network performance, especially, on user experiences on the single-frequency and single-RA sing le-RAT T networks. The Cell Outage Management feature automatically detects the cell outage scenarios, switches subscribers into interfrequency or inter-RAT neighboring cells, and forbids subscribers fromthe accessing or beinglifecycle handed over outage used cells, thereby achieving cell outage compensation. This feature runs through entire network and istomainly to shorten the duration of serious network faults, such as cell outage.
2.2 Benefits This section provides the benefits of the Cell Outage Management feature. This feature can quickly detect outage cells. It reduces the loss of user experience through cell outage compensation. It also improves the telecom operator image by shortening the cell outage duration through recovery of the outage cells. Cell outage compensation mechanism: The subscribers in outage cells are migrated to normal cells when recovering outage cells and are migrated back after recovery.
2.3 Functions The Cell Outage Management feature performs the following functions in sequence: 1.
Monitors the status of cells on the network and identifies outage cells.
2. Transfers UEs performing services from an outage cell to a functional cell, which includes barring the outage cell by setting CellAccess. CellBarred to CELL_BARRED (Barred). Barring a cell prevents new UEs from accessing the cell and UEs in neighboring cells from being handed over to the cell, and triggers online UEs in the cell to hand over to inter-frequency and inter-RA int er-RAT T neighboring cells. 3. Recovers an outage cell by reactivating the outage cell, restarting its base station, or resetting its RRU or baseband board (pico base stations do not support RRU and baseband board resetting resetting). ).
3
Cell Outage Detection Techniques
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3.1 Possible Causes of Cell Outage Possible causes of cell outage are as follows: l
Software or hardware faults on NEs
A fault may reside in a remote radio unit (RRU), radio frequency unit (RFU), baseband board, common public radio interface (CPRI), feeder, or transport link.
The eNodeB detects these types of fault and reports alarms. For details, see section 3.2.1 "Cell Outage Detection Based on an Alarm." l
Unknown faults
Unknown faults are the software and hardware faults that cannot be detected by NEs and do not trigger alarms, for example, faults on common channels or physical channels and software and hardware defects.
3.2 Cell Outage Detection This section describes the following four types of cell outage detection: l
Cell outage detection based on an alarm
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Cell outage detection based on a sleeping cell
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Cell outage detection based on an abnormal KPI
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Cell outage detection based on an internal audit
From SRAN9.0, the LTE supports all the four cell outage detections. However, the GSM and UMTS support only Manually set sleeping cell detection (turn on adaptive switch) in the category of cell outage detection based on a sleeping cell.
3.2.1 Cell Outage Detection Based on an Alarm During software and hardware detection, when an eNodeB detects a fault that causes cell unavailability, for example, a board, RF channel, or link fault, the eNodeB generates ALM-29240 Cell Unavailabl Unavailablee and reports a cell unavailability unavailabilit y notice to the U2000. After receiving the event, the U2000 determines that the cell outage occurs because of unavailable cell services. In addition, the U2000 adds the cell in outage to the related list and displays the list. If the fault causing cell unavailability has been rectified before or after a cell reset, the U2000 deletes the cell in outage from the list.
The faults that cause cell unavailability seriously affect user experience. Therefore, to ensure reliability of cell outage detection, the cell unavailability notice and ALM-29240 Cell Unavailable are reported independently. The cell unavailability notice is still reported even when ALM-29240 Cell Unavailable is masked by O&M personnel or lost because of alarm storms. Then, the U2000 can detect cells in outage based on the th e reported cell unavailability n notice. otice. If ALM-29240 Cell Unavailable is masked, O&M personnel cannot confirm and postprocess information about cells in outage. Therefore, it is recommended that monitoring cell outage alarms be enabled. In the scenario of multiple RRUs in one cell (pico base stations are not involved), if the eNodeB finds an RRU unavailability fault (RF channel fault or link fault) when diagnosing software and hardware, it generates ALM-29248 RF Out of Service and reports an "RRU Unavailability Event" to the U2000. On receiving the event, the U2000 determines that the RRU is in outage because of RRU unavailability. The U2000 will add an RRU in outage due to RRU unavailability to a list of outage RRUs and display the list on the GUI for user query. If the ALM-29248 RF Out of Service has been rectified before or after the RRU is reset, the U2000 deletes the RRU in outage from the list. Table 3-1 Conditions for triggering and exiting RRU unavailability notification Scenario
Trigger Condition
Exit Condition
Multi-RRU cell
An RRU unavailability fault occurs and the fault lasts for more than 5 minutes.
The RRU unavailability fault is rectified and the RRU functions normally for more than 5 minutes.
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3.2.2 Cell Outage Detection Based on a Sleeping Cell This section describes the cell outage detection based on a sleeping cell. The U2000 determines whether wheth er a cell is a sleeping cell periodically. perio dically. Table Table 3-2, Table 3-3, and Table 3-4 describe the criteria for the U2000 to determine that a sleeping cell is an outage cell during monitoring periods in different RATs. Table 3-2 Criteria for the U2000 to determine that a sleeping cell is an outage cell during monitoring periods (LTE) Method
KPI
Outage Cell Criteria
Example
Based on notraffic period
Number of of RRC connection setup attempts in a cell and maximum number of UEs in a cell
For a period specified by Notraffic period threshold (h) with the adaptive switch turned on, a cell meets the following conditions: The number of RRC connection setup attempts is 0. The number of UEs in connected mode is 0. The monitoring period and notraffic period threshold (in hours, ranging from 2 hours to 168 hours) can be set by users in the Parameters Setting window or be calculated based on the traffic volumes in the last three
Detecting a sleeping cell whose notraffic period is overlong
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weeks and preset parameters. The value of the No-traffic period threshold (h) parameter is determined by the traffic volumes of detected cells in the last three weeks. A small value of the No-traffic period threshold (h) parameter indicates a high traffic volume in the last three weeks, and a large value of the No-traffic period threshold (h) parameter indicates a low traffic volume in the last three weeks. Based on
Number of of
For a consecutive traffic
abnormal incoming handovers
RRC connection setup attempts in a cell, the incoming handover success rate in a cell, and maximum number of UEs in a cell
measurement (in hours), a sleeping cell meets the period following without acell UE conditions: but with neighboring The number of RRC connection setup attempts and the number relationships and potential of UEs in connected mode are incoming 0. handovers The incoming handover success rate is 0 while the number of incoming handover attempts is not 0. The number of incoming handover attempts during accumulated consecutive periods with with abnor abnormal mal handovers is greater than 10.
Detecting a
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Table 3-3 Criteria for the U2000 to determine that a sleeping cell is an outage cell during monitoring periods (UMTS) Method
KPI
Outage Cell Criteria
Example
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Method
KPI
Based on Number of no-traffic RRC period connection setup attempts
Outage Cell Criteria
Example
For a period specified by No-traffic period threshold (h) with the adaptive switch turned on, a cell meets the following conditions: The number of RRC connection setup attempts is 0. Values of the Monitoring period (s) and No-traffic period threshold (h) parameters paramete rs are adaptive adaptively ly calculat calculated ed by the system. For details, see UMTSrelated descriptions.
Detecting a sleeping cell whose notraffic period is overlong
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Table 3-4 Criteria for the U2000 to determine that a sleeping cell is an outage cell during monitoring periods (GSM) Method
KPI
of Based on Number of SD noconnection traffic setup period attempts
Outage Cell Criteria
Example
For a period specified by No-traffic period threshold (h) with the adaptive switch turned on, a cell meets the following conditions:
Detecting a sleeping cell whose notraffic period is overlong
The
number of SD connection setup attempts is 0. Values of the Monitoring period (s) and No-traffic period threshold (h) parameters paramete rs are ad adaptively aptively calculate calculated d by the l
system. For details, see GSM-related descriptions.
The system adaptively calculates the monitoring period and no-traffic period for a cell. If the traffic volume of this cell is ultra low in the last three weeks, the cell is considered as an ultra-low-traffic cell and added in the list of ultra-lowtraffic cells for users to view. Traffic Traffic in ultra-low-traffic cells remains lo lower wer or even 0. In this situation, resou resources rces used for the system to monitor cells cannot be fully used and incorrect detection information is repeatedly reported if the system monitors cells based on the sleeping cell detection for a long period. In addition, cells with the low density of users and low traffic have minor impacts on network KPIs and user experiences. Therefore, ultra-low-traffic cells are displayed in a list for users to view. Table 3-5 describes the scenarios where sleeping cell detection is not used for the U2000 to determine that a cell is in outage. Table 3-5 Scenarios where sleeping cell detection is not used for the U2000 to determine an outage cell Detecti tio on M Me etho thod
Cell St Status
Sleeping cell detection
A cell is barred. In this case, UEs cannot initiate an RRC connection setup in this cell. Therefore, RRC-related KPIs are not used to determine whether this cell is in outage. A cell in the CellReservedForOp state is considered to be barred during during UE cell selec selection tion and reselect reselection ion in some some cases. The duration in which a cell is unavailable due to manual, system, or energe-saving reasons is not 0. A cell has no traffic during the period that is not monitored.
The U2000 generates a list of outage cells and adds sleeping cells to the list. Then, it displays the list on the client for users to view vi ew.. The U2000 obtains KPI data every hour. It determines whether a cell is recovered from outage within the monitoring period. On an LTE network, if sleeping cell detection is performed based on an adaptive traffic model, the U2000 U200 0 http://localhost:7890/printtopics. http://localhost :7890/printtopics.html?time=T html?time=Tue%20Nov%2007%20201 ue%20Nov%2007%202017%2020:15:29%20GMT+ 7%2020:15:29%20GMT+0800%20(Malay%20P 0800%20(Malay%20Peninsula%20Standard%2 eninsula%20Standard%20Time) 0Time)
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determines whether a cell is recovered from outage based on the calculated Monitoring period (s) and No-traffic t urned on. If sleeping cell detection is performed based period threshold (h) parameter values with the adaptive switch turned on the preset Monitoring period (s) and No-traffic period threshold (h), the U2000 determines whether a cell is recovered from outage based on the user-defined Monitoring period (s) and No-traffic period threshold (h) parameter values. On a GSM or UMTS network, the U2000 determines whether a cell is recovered recov ered from outage based only on the calculated Monitoring period (s) and No-traffic period threshold (h) parameter values with the adaptive switch turned on. If the obtained data meets conditions that suggest a cell is recovered from outage, the U2000 removes the cell from the list of outage cells. The U2000 also generates a list of ultra-low-traffic cells and adds ultra-low-traffic cells to this list. Then, it displays the list on the client for users to view. If the traffic in an ultra-low-traffic cell continuously increases, and based on the calculated Monitoring period (s) and No-traffic period threshold (h) parameter values with the adaptive switch turned t urned on, this cell does not meet the conditions by which the system determines a cell is an ultra-low-traffic cell, the cell is removed from the list of ultralow-traffic cells and monitored again.
3.2.3 Cell Outage Detection Based on an Abnormal KPI This section describes the cell outage detection based on an abnormal KPI. Cell Outage Detection Based on an Abnormal Basic KPI The eNodeB detects outage cells by consecutively monitoring the same type of KPIs twice. Especially, in the low traffic scenario, if the value of a KPI generated in one traffic measurement period (on the eNodeB side) does not meet requirements, the system accumulates this value and that generated in the next measurement period until the sum of the values reaches the threshold. Then, the eNodeB performs cell outage detection. If the sum of the values in more than 24 hours does not meet requirements, the eNodeB clears all data and detects outage cells again. If any of the three types of KPIs in a cell is abnormal, the U2000 considers this cell an outage cell until the KPIs become normal. Table 3-6 describes the three types of KPIs and the scenarios where these KPIs are abnormal.
The traffic measurement mentioned in this part is not dedicated for CODC. The traffic measurement period mentioned in this section refers to the minimum traffic measurement period other than the 5-minute period. The eNodeB checks KPIs based only on reliable traffic statistics. The traffic measurement period on the eNodeB is the same as that on the U2000. Therefore, you need to calibrate the traffic measurement time when the eNodeB detects cells in outage for the first time after CODR is activated. For example, if the minimum traffic measurement period that the U2000 subscribes to is 30 minutes, and the CODC task is subscribed to at 02:12 in the morning, the eNodeB detects cells in outage at at 02:30 for the first time. Table 3-6 Scenarios where KPIs are abnormal for outage cell detection KPI
Scenario Where KPIs Are Abnormal
RRC connection setup success rate
A cell meets the following conditions: The number of RRC connection setup attempts is greater than RRC Setup Threshold. The RRC connection setup success rate is lower than RRC Setup Success Threshold.
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EE-RA RAB B setu setup p su succ cces esss rate rate
A cell cell meet meetss th thee foll follow owin ing g co cond ndit itio ions ns:: The number of E-RAB connection setup attempts is greater than E-RAB Se Threshold. The E-RAB connection setup success rate is lower than E-RAB Setup Succ Threshold.
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Abn bnor orma mall se serv rvic icee d dro rop p rat ratee
A cel celll me meet etss th thee ffol ollo low wing ing con condi diti tion ons: s: The number of E-RAB releases in the cell is greater than Service Release N Threshold. The abnormal service drop rate is greater than or equal to Abnormal Relea Threshold. The KPI calculation is based on E-RAB-level service drops. If an E-RAB ex abnormal service drop, the number of service drops is counted once. l
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Users can set the thresholds for the three KPIs on the U2000 client. If any of the three KPIs of a cell does not meet the requirements for their respective thresholds, the U2000 considers this cell to be in outage. Table 3-7 describes the scenarios where an abnormal KPI is not used for the U2000 to determine that a cell is in outage according to Table 3-6. Table 3-7 Scenarios where KPIs are not used for the U2000 to determine an outage cell Detection Method
Cell Status
Detection based on an abnormal KPI related to RRC, E-RAB, and abnormal service drop rate
A cell is in the state of intelligent power-off of carriers in the same coverage, carrier shutdown in low power consumption mode, and automatic power-off at a specified time when energy conservation and emission reduction is enabled. For details, see Energy Conservation and Emission Reduction Feature Parameter Description. A cell is blocked. A cell is barred. In this case, UEs cannot initiate an RRC connection setup in this cell. Therefore, RRC-related KPIs are not used to determine whether this cell is in outage.
The U2000 adds outage cells whose KPIs are abnormal to the outage cell list, which is displayed on the GUI for user to query. Before or after an outage cell is restarted, if the counter values of a KPI within a number of consecutive measurement periods reach the specified thresholds, the U2000 determines whether the abnormal KPI becomes normal. If the KPI that causes the cell to be in outage becomes normal, the NE determines the cell is restored and reports an outage cell restore event to the U2000. Then the U2000 deletes the cell from the outage cell list. Table 3-8 lists the three types of KPIs and the scenarios where these KPIs are abnormal. Table 3-8 Scenarios where abnormal KPIs become normal for cell outage detection KPI
Scenario Where an Abnormal KPI Becomes Normal
RRC connection setup success rate
A cell meets the following conditions: The number of RRC connection setup attempts is greater than RRC Setup N Threshold. The RRC connection setup success rate is higher than or equal to the sum of Success Rate Threshold and 5% (with the maximum value 100% even if the Setup Success Rate Threshold and 5% is higher than 100%). l
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EE-RA RAB B sset etup up su succ cces esss rrat atee
A ccel elll m mee eets ts th thee fol follo lowi wing ng co cond ndit itio ions ns:: The number of E-RAB connection setup attempts is greater than E-RAB Set Threshold. The E-RAB connection setup success rate is higher than or equal to the sum Setup Success Rate Threshold and 5% (with the maximum value 100% even E-RAB Setup Success Rate Threshold and 5% is higher than 100%). l
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Ab Abno norm rmal al se serv rvic icee dro drop p rat ratee
A ccel elll m mee eets ts the the fol follo lowi wing ng co cond ndit itio ions ns:: The number of E-RAB releases in the cell is greater than Service Release N Threshold. The abnormal service drop rate is lower than the difference between Abnor Rate Threshold and 5% (with the minimum value 1% even if the difference b Abnormal Release Rate Threshold and 5% is less than 1%). l
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Cell Outage Detection Based on an Abnormal Scheduled KPI For KPIs that support customization, see chapter 6 "Counters." In addition to the cell outage detection based on an abnormal basic KPI, the U2000 provides the cell outage detection based on an abnormal scheduled KPI. Users can set KPI combined rules on the U2000 such as "KPI Rules", "Abnormal KPI Duration", "Abnormal KPI Frequency", and "Normal KPI Duration" to identify cell outage events in specific scenarios. http://localhost:7890/printtopics. http://localhost :7890/printtopics.html?time=T html?time=Tue%20Nov%2007%20201 ue%20Nov%2007%202017%2020:15:29%20GMT+ 7%2020:15:29%20GMT+0800%20(Malay%20P 0800%20(Malay%20Peninsula%20Standard%2 eninsula%20Standard%20Ti… 0Ti…
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The U2000 lists the KPIs that can be selected on the GUI, and users can select required KPIs and set KPI rules. Observe the following rules when you set KPI rules: l
The combined rule and calculation types include: and, or, >, =, RAN Management > SON Management > CODR Management > CODR Reference.
4.3 Planning N/A
4.4 Deployment None
4.5 Deployment of the Cell Outage Management Feature This section describes the procedure for you to deploy this feature.
4.5.1 Process None
4.5.2 Requirements http://localhost:7890/printtopics. http://localhost :7890/printtopics.html?time=T html?time=Tue%20Nov%2007%20201 ue%20Nov%2007%202017%2020:15:29%20GMT+ 7%2020:15:29%20GMT+0800%20(Malay%20P 0800%20(Malay%20Peninsula%20Standard%2 eninsula%20Standard%20Ti… 0Ti…
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Requirements for the Operating Environment None Requirements for the Transmission Topology None Requirements for Licenses To use the Cell Outage Management feature, telecom operators must purchase the licenses from Huawei. Table 4-1 lists the control items related to the licenses. Table 4-1 License control items for Cell Outage Management Feature ID LOFD-002012
Feature Name Cell Outage Detection and Compensation
License Control Item Cell Outage Detection and Compensation (FDD)
NE LTE
PLBFD-009001
Self-healing
Self-healing
U2000
WOFD-171000
Cell Outage Detection and Recovery - LTE
Cell Outage Detection and Recovery - LTE
U2000
WOFD-171300
Cell Outage Detection and Recovery - WRAN
Cell Outage Detection and Recovery - WRAN
U2000
WOFD-171200
Cell Outage Detection and Recovery - GBSS
Cell Outage Detection and Recovery - GBSS
U2000
4.5.3 Precautions Use the Auto Recover function with caution when multiple functions are used for similar outage detection on LTE cells. Avoid the situation that an outage cell is restarted repeatedly because cell outage is detected at different time. For example, preset KPI detection finds an LTE cell's KPIs being abnormal using only 30 minutes while self-defined KPI detection finds the th e LTE LTE cell's KPIs being abnormal abno rmal using 1 hour. In this situation, sit uation, the U2000 will restart the LTE cell separately for these two detections, which affects user experience. To avoid the preceding situation and facilitate observation, you are advised to use only one cell outage detection method for an object to be detected such as RRC setup success rate. In this way, instead of being restarted repeatedly because of separate detections, the outage ou tage cell is restarted for only once.
4.5.4 Hardware Adjustment N/A
4.5.5 Initial Configuration Operation entries:
Step 1 On the U2000 client, choose SON > GSM Cell Outage Detection and Recovery , UMTS Cell Outage Detection and Recovery, or LTE Cell Outage Detection and Recovery .
This section uses LTE Cell Outage Detection and Recovery as an example, as shown in Figure 4-1. Figure 4-1 LTE Cell Outage Detection and Recovery window
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Step 2 Set eNodeBs you want to detect. 1.
Choose Parameter Settings > Outage Cells > Base Station Monitoring.
The Select NE(s) dialog box is displayed, as shown in Figure 4-2. 2.
Select eNodeBs for which you want to perform outage cell detection and click OK .
On an LTE network, if you select Auto monitor new eNodeBs, the U2000 automatically monitors the added eNodeBs after the Cell Outage Detection and Recovery feature is enabled.
The Auto monitor new eNodeBs check box does not exist in the Set Base Station Monitoring dialog box on a GSM or UMTS network because it applies only to eNodeBs. Figure 4-2 Set NE dialog box
Choose Parameter Settings > Outage RRU > RRU Monitoring. The Select RRU(s) dialog box is displayed, as shown in Figure 4-3. Figure 4-3 Select RRU(s) box
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On an LTE network, if you select Auto monitor all RRUs of new eNodeBs, the U2000 automatically monitors the added eNodeBs after the Cell Outage Detection and Recovery feature is enabled.
The Auto monitor all RRUs of new eNodeBs check box does not exist in the Select RRU(s) dialog box on a GSM or UMTS network because it applies only to eNodeBs.
Step 3 Set parameters related to cell outage detection. This section provides provide s only the recommended configurations for parameters in different RA RATs. Ts. For details about parameters and value ranges in different RATs, RATs, see U2000 Product Documentation ( Documentation (Operation and Maintenance > RAN Management > SON Management > CODR Management). Alternatively, you can press F1 on the U2000 client to invoke the online help . The recommended configurations co nfigurations for p parameters arameters in different RAT RATss are as follows: l
Parameter configurations on the GSM network
Click , the Parameters Settings dialog box is displayed. After parameters are set, click OK to to enable the cell outage detection function. Figure 4-4 shows the Parameters Settings dialog box on the GSM network. Figure 4-4 Parameters Settings dialog box on the GSM network
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Table 4-2 describes parameters on the GSM network and recommended configurations. Table 4-2 Recommended configurations for parameters on the GSM network Parameter Name
Recommended Configuration
Parameter Description
Enable longtime no-traffic judgment (Adaptive Setting)
Select Enable long-
After this parameter is selected, a cell that has no traffic for a long time is considered as a sleeping cell, and detection of sleeping cells in the corresponding scenario can be enabled. Therefore, you are advised to select this parameter.. parameter
Cell traffic model update period
time no-traffic judgment (Adaptive (Adaptive Setting).
Set this parameter to One week .
This parameter specifies the frequency that the U2000 calculates the values of parameters related to cell outage detection, such as Monitoring period (s) and No-traffic period threshold (h). In this parameter, the adaptive switch is turned on and the unit is week. In this case, a shorter update period indicates that the calculated parameter values meet the latest traffic condition more closely. In addition, the time that the adaptive calculation is performed is specified based on this parameter. In normal cases, the adaptive calculation is performed at 00:15 on each Monday. Therefore, the calculation operations increase in the update period.
Minimum notraffic period threshold (h)
Set this parameter to 3.
This parameter specifies the minimum period that a cell is determined to be a sleeping cell. A larger value indicates a more accurate detection result. Accordingly, the time required for detecting a sleeping cell increases. A smaller value indicates a less accurate detection result. Accordingly, the time required for detecting a sleeping cell decreases.
Generate alarm on cell outage
Deselect Generate
This parameter specifies the correlation between outage ccells ells and alarms. Af After ter this parameter is select selected, ed, the U2000 U2000 ge generates nerates
alarm on cell outage.
related alarm notification if a cell becomes in outage so that users do not need to confirm the cell outage information repeatedly in the CODR Management window. This improves the operation efficiency.
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Parameter Name
Recommended Configuration
Parameter Description
Outage cell recovery mode
Set this parameter to Recover After Manual Acknowledgement.
This parameter specifies the outage cell recovery mode. In the automatic mode, the recovery may affect user experience of UEs in connected mode in an outage cell. In this case, you are advised to manually acknowledge the cell by following the instructions provided in section 3.4 Restoration of Outage Cells and RRUs when the cell is determined to be in outage.
l
Parameter configurations on the UMTS network
Click , the Parameters Settings dialog box is displayed. After parameters are set, click OK to to enable the cell outage detection function. Figure 4-5 shows the Parameters Settings dialog box on the UMTS network. Figure 4-5 Parameters Settings dialog box on the UMTS network
Table 4-3 describes parameters on the UMTS network and recommended configurations. Table 4-3 Recommended configurations for parameters on the UMTS network Parameter Name
Recommended Configuration
Parameter Description
Enable longtime no-traffic judgment (Adaptive Setting)
Select Enable long-
After this parameter is selected, a cell that has no traffic for a long time is considered as a sleeping cell, and detection of sleeping cells in the corresponding scenario can be enabled. Therefore, you are advised to select this parameter.. parameter
time no-traffic judgment (Adaptive (Adaptive Setting).
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Parameter Name
Recommended Configuration
Parameter Description
Cell traffic model update period
Set this parameter to One week .
This parameter specifies the frequency that the U2000 calculates the values of parameters related to cell outage detection, such as Monitoring period (s) and No-traffic period threshold (h). In this parameter, the adaptive switch is turned on and the unit is week. In this case, a shorter update period indicates that the calculated parameter values meet the latest traffic condition more closely. In addition, the time that the adaptive calculation is performed is specified based on this parameter. In normal cases, the adaptive calculation is performed at 00:15 on each Monday. Therefore, the calculation operations increase in the update period.
Minimum notraffic period threshold (h)
Set this parameter to 3.
This parameter specifies the minimum period that a cell is determined to be a sleeping cell. A larger value indicates a more accurate detection result. Accordingly, the time required for detecting a sleeping cell increases. A smaller value indicates a less accurate detection result. Accordingly, the time required for detecting a sleeping cell decreases.
Generate
Deselect Generate
This parameter specifies the correlation
alarm on cell outage
alarm on cell outage.
Outage cell recovery mode
Set this parameter to Recover After Manual Acknowledgement.
between outage ccells ells and alarms. Af After ter this parameter is select selected, ed, the U2000 U2000 wi will ll notify users if a cell becomes in outage so that users do not need to confirm the cell outage information repeatedly in the CODR Management window. This improves the operation efficiency. This parameter specifies the outage cell recovery mode. In the automatic mode, the recovery may affect user experience of UEs in connected mode in an outage cell. In this case, you are advised to manually acknowledge the cell by following the instructions provided in section 3.4 Restoration of Outage Cells and RRUs when the cell is determined to be in outage.
l
Parameter configurations on the LTE network
Figure 4-6 shows the basic Parameters Settings dialog box on the LTE network. Figure 4-6 Basic Parameters Settings dialog box on the LTE network
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Table 4-4 describes basic parameters on the LTE network and recommended configurations. Table 4-4 Recommended configurations for basic parameters on th thee L LTE TE network Parameter Name
Recommended Configuration
Parameter Description
Enable preset KPI detection
Select Enable preset KPI detection.
This parameter specifies whether to enable preset KPI KPI detec detection. tion. You You are aadvised dvised to select this parameter.
Enable internal audit
Select Enable internal audit.
This parameter specifies whether to enable internal audit on the eNodeB side. You are advised to select this parameter.
Enable incoming handover abnormality judgment
Select Enable incoming handover abnormality judgment.
After this parameter is selected, a cell is considered as a sleeping cell based on abnormal incoming handovers, and detection of sleeping cells in the corresponding scenario can be enabled. Therefore, you are advised to select this parameter.
Enable cell unavailability fault detection
Select Enable cell unavailability fault detection.
This parameter specifies whether to enable alarm-based cell/RRU outage detection. You are advised to select this parameter.
Enable longtime no-traffic judgment
Select Enable long-
After this parameter is selected, a cell that has no traffic for a long time is considered as a sleeping cell, and detection of sleeping cells in the corresponding scenario can be enabled. Therefore, you are advised to select this parameter.. parameter
Adaptive Settings
time no-traffic judgment.
Select Adaptive Settings.
After this parameter is selected, the detection of sleeping cells based on long-time no traffic is performed in adaptive mode. Users can customize the detection parameter model based on the cell ttraffic raffic model model to ma make ke the detection more accurate. Therefore, you are advised to select this parameter. Adaptive Settings and Manual Settings cannot be selected at the same time. For details, see Table 3-2.
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Parameter Name
Recommended Configuration
Parameter Description
Cell traffic model update period
Set this parameter to One week .
This parameter specifies the frequency that the U2000 calculates the values of parameters related to cell outage detection, such as Monitoring period (s) and No-traffic period threshold (h). In this parameter, the adaptive switch is turned on and the unit is week. In this case, a shorter update period indicates that the calculated parameter values meet the latest traffic condition more closely. In addition, the time that the adaptive calculation is performed is specified based on this parameter. In normal cases, the adaptive calculation is performed at 00:15 on each Monday. Therefore, the calculation operations increase in the update period.
Minimum notraffic period threshold (h)
Set this parameter to 3.
This parameter indicates the minimum period that the U2000 detects a sleeping cell with the adaptive switch turned on. On the network where traffic fluctuation cells (cells whose traffic models change frequently) exist, a larger value indicates a more accurate detection result. Accordingly, the time required for detecting a sleeping cell increases. A smaller value indicates a less accurate detection result. Accordingly, the time required for detecting a sleeping cell decreases.
Manual Settings
Deselect Manual Settings.
After this parameter is selected, the detection of sleeping cells based on long-time no traffic is performed in manual mode. Users can set parameter values in this mode mode.. Howev However, er, th thee U2000 detects sleeping cells more accurately in adaptive mode. Therefore, you are advised to deselect this parameter. Adaptive Settings and Manual Settings cannot be selected at the same time. For details, see Table 3-2.
No-traffic No-traffic period
Set this parameter to 96.
This parameter indicates the no-traffic period of the outage cell in the manual setting scenario. A larger value indicates a longer time required for detecting a sleeping cell. Accordingly, a smaller value indicates shorter time that a cell is determined toabe a sleeping cell. You can configure and adjust this parameter based on the high or low traffic period of of cells on the live n network. etwork.
Monitoring period (s) (s)
Set the monitoring period to to the time from 8:00 to 20:00.
This parameter indicates the period that the sleeping cell detection is performed in the manual setting scenario. Monitoring period (s) is used with No-traffic period (h) for detecting sleeping cells. You can configure and adjust this parameter based on the high or low traffic period of cells on the live network.
Generate alarm on cell outage
Deselect Generate alarm on cell outage.
This parameter specifies the correlation between outage ccells ells and alarms. A After fter this parameter is selecte selected, d, the U2000 U2000 will notify users a celltobecomes so that users do notifneed confirm in theoutage cell outage information repeatedly in the CODR Management window. This improves the operation efficiency.
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Parameter Name
Recommended Configuration
Parameter Description
Outage cell recovery mode
Set this parameter to Recover After Manual Acknowledgement.
This parameter specifies the outage cell recovery mode. In the automatic mode, the recovery may affect user experience of UEs in connected mode in an outage cell. In this case, you are advised to manually acknowledge the cell by following the instructions provided in section 3.5 "Suggestions on Handling Cell Outage" when the cell is determined to be in outage.
Auto outageisolate cells
Auto cells. Deselect isolate outage
This parameter specifies whether to isolate outage cells in the following scenarios: Outage cells are not recovered within the estimated cell recovery duration after Outage cell recovery mode is set to Recover After Manual Acknowledgement or Automatically Recover and the cell selfhealing is performed. Outage cell recovery mode is set to No Recovery. For detailed operations, see section 3.3 "Service Adjustment for Outage Cells." After this parameter is selected, no NEs camp on or access the isolated cells.
l
l
Estimated cell
2
This parameter specifies the duration during
recovery duration (h)
which cells are mode recovered Outageoutage cell recovery is setafter to Recover After Manual Acknowledgement or Auto Recover. You can set this parameter based on traffic volumes of cells on the live network. Value range: 2 to 168 (2 by default)
Configure preset KPI parameters on the LTE network in the LTE Cell Outage Detection and Recovery dialog box, as shown in Figure 4-8. Figure 4-7 Preset KPI parameter setting dialog box on the LTE network
Table 4-5 Recommended configurations for preset KPI parameters on the LTE network Para Parame mete terr Nam Name e
Reco Recomm mmen ende ded d Configuration
Parameter Description
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Para Parame mete terr Nam Name e
Reco Recomm mmen ende ded d Configuration
Parameter Description
RRC setup number
20
This parameter indicates the number of RRC connection setup attempts. You are advised to set the parameter based on the traffic measurement period subscribed to on the eNodeB side. If the minimum traffic measurement period subscribed to on the eNodeB side is 15 minutes, set this parameter to 20. If the minimum traffic measurement period subscribed to on the eNodeB side is 60 minutes, set this parameter to 80. l
l
RRC setup success rate (%)
5%
This parameter indicates the RRC connection setup success rate. You are advised to set the parameterr to a value paramete value less tthan han or eq equal ual to 10%.
E-RAB setup number
20
This parameter indicates the number of ERAB connection setup attempts. You are advised to set the parameter based on the traffic measurement period subscribed to on the eNodeB side. If the minimum traffic measurement period subscribed to on the eNodeB side is 15 minutes, set this parameter to 20. If the minimum traffic measurement period l
l
subscribed to on the eNodeB side is 60 minutes, set this parameter to 80. E-RAB Setup Success Rate (%)
5%
This parameter indicates the E-RAB connection setup success rate. You are advised to set the parameter to a value less than or equal to 10%.
Service release number
20
This parameter indicates the number of service releases. You are advised to set the parameterr based on paramete on the tra traffic ffic mea measurement surement period subscribe subscribed d to on th thee eNode eNodeB B side. If the minimum traffic measurement period subscribed to on the eNodeB side is 15 minutes, set this parameter to 20. If the minimum traffic measurement period subscribed to on the eNodeB side is 60 l
l
minutes, set this parameter to 80. Abnormal release rate (%)
95%
This parameter indicates the abnormal service release rate. You are advised to set the parameter to a value greater than or equal to 95%.
For detailed operations, see RAN see RAN Management > SON Management > CODR Management > GUIs and Parameters for CODR Management > Parameters for Adding a KPI Combination Rule in Rule in U2000 Online Help. Help. Figure 4-8 Settings of the abnormal abn ormal scheduled KPIs for the LTE
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4.5.6 Activation Observation This section describes the methods used to determine whether the Cell Outage Management feature is effective. List Outage The displays therestored detected outage cells that have not been of as theshown tab page and the cells in the theOutage tabarea page, in CellsU2000 Cleared Outage Cellrestored List areainofthe OutageCell Cells Figure 4-9.
When Waiting to Be Manually Started is displayed in the Task Status column of the outage cell, right-click this cell and choose Reactivate Cell, Reset Base Station, Reset RRU, Reset RRU Through T hrough Power-off , Reset BBP, or Reset BBP Through Power-off as required. (Only Reactivate Cell and Reset Base Station are available for pico base stations.) Figure 4-9 Outage cells in the Outage Cell area
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When outage cells are restored, the system automatically removes these cells from the Outage Cell List area and adds them to the Cleared Outage Cell List area. If the system cannot determine whether an outage cell is restored or mistakes a normal cell as an outage cell, you can select this cell, right-click it, and choose Clear Outage Cell Info from the shortcut menu. By doing this, this cell can be removed from the Outage Cell List area and added to the Cleared Outage Cell List area. l If the outage cell fails to be recovered by reactivating it, the U2000 will determine whether to isolate the outage cell based on the setting of Auto isolate outage cells.
If Auto isolate outage cells is selected, the U2000 isolates this cell if it is not recovered within a specified period of time. After the cell is isolated, the U2000 no longer determines whether the cell is recovered based on KPIs, and the
−
cell cell willand be reserved in the Outage Cells area all along. After the outage cell is recovered manually, you can right-click the choose Clear Outage Cell Info from the shortcut menu to remove the cell from the Outage Cells area. − If Auto isolate outage cells is not selected, the U2000 will still determine whether the cell is recovered. After the outage cell is recovered automatically or manually, you can right-click the cell and choose Clear Outage Cell Info from the shortcut menu to remove the cell from the Outage Cells area. l When the system clears the task, it automatically releases the cell from isolation if the cell has been isolated, for example, barring the cell and preventing UEs from accessing the cell.
The U2000 does not perform sleeping cell detection for cells always with very low traffic, because it is difficult for the U2000 to determine whether the low traffic is a normal situation or not. Instead, the U2000 displays such cells on the Ultra-low Traffic Cells tab page, as shown in Figure 4-10. Sleeping cell detection is perform in other cells with Manually set sleeping cell detection (turn on adaptive switch) selected. Figure 4-10 Ultra-low Traffic Cells tab page
The outage RRUs that have not been recovered are presented in Outage RRU List, and the cleared outage RRUs are presented in Cleared Outage RRU List, as shown in Figure 4-11(not involved for pico base stations). Figure 4-11 Outage RRUs
If Generate alarm on cell outage is selected under Alarm Settings, alarm events related to outage cells will be displayed in the Query Event Logs window. In addition, you can view the information about Cell Outage and Restore Cell Outage events in the SON logs. To view the LTE CODR SON logs, choose SON > SON Log and select LTE Cell Outage Detection Log in the Log Category column, as shown in Figure 4-12. Figure 4-12 SON logs
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4.5.7 Deactivation To deactivate the cell outage detection, perform the following steps:
Step 1 On the U2000 client, choose SON > GSM Cell Outage Detection and Recovery, UMTS Cell Outage Detection and Recovery, or LTE LTE Cell Outage Detection and Recovery.
The GSM Cell Outage Detection and Recovery, UMTS Cell Outage Detection and Recovery, or LTE LTE Cell Outage Detection and Recovery window is displayed.
Step 2 Deselect a base station In this case, the cell outage detection is deactivated and the U2000 does not detect and handle outage cells on this base station. ----End
4.6 Maintenance This section provides the guidelines about how to maintain activated features. Feature Monitoring and Evaluation This section provides instructions on how to monitor and evaluate the Cell Outage Management feature. The U2000 checks the outage cells displayed in the Outage Cell area based on site conditions. If some cells that are in outage but not detected or there is a high probability of a normal cell being mistaken as in outage, you need to optimize and reset the improper thresholds that cause these problems for some parameters. Engineering Guidelines for Feature Parameters This section provides the engineering guidelines for you to set parameters related to this feature. Parameters related to cell outage detection include monitoring periods, no-traffic period thresholds, and KPI thresholds. If a cell outage decision is delayed or inaccurate (for example, a normal cell is mistaken as in outage or some outage cells fail to be detected) due to improper parameter settings, you need to adjust relevant parameters based on site monitored base station conditions. By default, you are advised to enable all monitor-related features to maximize the algorithm performance.
4.7 Troubleshooting Fault Description No outage cells are displayed in the t he GSM Cell Outage Detection and Recovery , UMTS Cell Outage Detection and Recovery, or LTE LTE Cell Outage Detection and Recovery window. Fault Handling To rectify the fault, perform the following steps:
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Step 1 Check whether base stations are selected on the U2000.
Step 2 If base stations have been selected, proceed to Step 2. If not, select a base station in the GSM Cell Outage Detection
and Recovery, UMTS Cell Outage Detection and Recovery , or LTE LTE Cell Outage Detection and Recovery window.
Step 3 Check whether the time source of base stations is consistent with that on the U2000. If it is consistent, proceed to Step 4. If it has not been set, set the time source of base stations first.
Step 4 Check whether maintenance modes of the selected base stations are normal. If yes, skip to Step 5. If no, proceed to Step 5 to set NE Mode to NORMAL.
Step 5 On the U2000 client, choose Maintenance > Maintenance Mode. In the displayed Maintenance Mode window, click to query the maintenance modes of the selected base stations. If maintenance modes are not NORMAL, click to set NE Mode to NORMAL. Then, proceed to Step 6.
Step 6 Check the cell traffic. If traffic of all cells does not meet the cell outage identification criteria, this situation is normal. If some cells are in outage but fail to be reported, contact Huawei technical support. Figure 4-13 Querying and setting maintenance modes
----End
5
Parameters
This chapter lists the parameters related to this feature on the U2000. Table 5-1 describes parameters that are available on the GSM, UMTS, an and d LTE LTE networks. Table 5-1 Parameter description on the t he U2000 client (GSM, UMTS, and LTE) Parameter Name
Feature ID ID
Feature N Na ame
Parameter De Description
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Parameter Name
Feature ID ID
Feature N Na ame
Parameter De Description
Manually set sleeping cell detection (turn on adaptive switch)
WOFD171000 WOFD171200 WOFD171300
Cell Outage Detection and Recovery - LTE Cell Outage Detection and Recovery - GBSS Cell Outage Detection and Recovery -
Meaning: After this parameter is selected, the system monitors cells on the GSM, UMTS, and LTE networks with the adaptive switch turned on. The values of traffic models in each monitored cell are calculated adaptively.
WRAN
detection (turn off adaptive switch) precedes Manually set sleeping cell detection (turn on adaptive switch). When the former feature is enabled, you need to manually set the parameter for cells on the LTE network. This does not affect cells on the GSM and UMTS networks.
Manually set sleeping cell
GUI Value Range: ON (enabled), OFF (disabled) Actual Value Range: ON, OFF Unit: None Default Value: ON (enabled) Cell Traffic
WOFD-
Cell Outage
Meaning: indicates the period of
Model Update interval
171000 WOFD171200 WOFD171300
Detection and Recovery - LTE Cell Outage Detection and Recovery - GBSS Cell Outage Detection and Recovery WRAN
traffic model update with the adaptive switch turned on. GUI Value Range: Not update, One week , Two weeks, Three weeks, and Four weeks Actual Value Range: Not update, One week , Two weeks, Three weeks, and Four weeks Unit: None Default Value: One week
Minimum no-
WOFD171000 WOFD171200
Cell Outage Detection and Recovery - LTE Cell Outage Detection and Recovery - GBSS Cell Outage Detection and Recovery WRAN
Meaning: The no-traffic period of traffic model with the adaptive switch turned on cannot be lower than the minimum no-traffic period (hour) threshold. Otherwise, set the no-traffic period to this minimum no-traffic period threshold. GUI Value Range: 1 to 12 Actual Value Range: 1 to 12 Unit: Hour Default Value: 3
Cell Outage Detection and Recovery - LTE Cell Outage Detection and Recovery - GBSS Cell Outage Detection and
Meaning: After this parameter is selected, the system generates an event alarm and displays the alarm in the alarm management window when it detects an outage cell or the outage cell is restored. GUI Value Range: ON (enabled), OFF (disabled)
Recovery WRAN
Actual Value Range: ON, OFF Unit: None Default Value: OFF (disabled)
traffic period threshold (h)
WOFD171300
Generate alarm on cell outage
WOFD171000 WOFD171200 WOFD171300
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Parameter Name
Feature ID ID
Feature N Na ame
Parameter De Description
Outage cell recovery mode
WOFD171000 WOFD171200 WOFD171300
Cell Outage Detection and Recovery - LTE Cell Outage Detection and Recovery - GBSS Cell Outage Detection and Recovery -
Meaning: selects the outage cell recovery mode. GUI Value Range: Recover After Manual Acknowledgement, Automatically Recover, or No Recovery Actual Value Range: Recover After Manual Acknowledgement, Automatically Recover, or No
WRAN
Recovery Unit: None Default Value: Recover After Manual Acknowledgement
Table 5-2 describes parameters that are available only on th thee LTE LTE network. Table 5-2 Parameter description on the U2000 client (LTE only) Parameter Name
Feature ID ID
Feature N Na ame
Parameter ter Descripti ption
Enable internal audit
WOFD171000
Cell Outage Detection and Recovery - LTE
Meaning: detects cell outage in the cell you want to monitor on the LTE network with the internal audit enabled. GUI Value Range: ON (enabled), OFF (disabled) Actual Value Range: ON, OFF Unit: None Default Value: ON (enabled)
Enable preset KPI detection
WOFD17100
Cell Outage Detection and Recovery - LTE
Meaning: enables preset KPI detection for the LTE cell you want to monitor GUI Value Range: ON (enabled), OFF (disabled) Actual Value Range: ON, OFF Unit: None Default Value: ON (enabled)
Enable cell unavailability fault detection
WOFD171000
Cell Outage Detection and Recovery - LTE
Meaning: enables alarm-based cell/RRU outage detection for the LTE cell you want to monitor GUI Value Range: ON (enabled), OFF (disabled) Actual Value Range: ON, OFF Unit: None Default Value: ON (enabled)
Enable incoming handover abnormality judgment
WOFD171000
Cell Outage Detection and Recovery - LTE
Meaning: detects outage cells in the cell you want to monitor on the LTE network with the incoming handover abnormality judgment enabled. GUI Value Range: ON (enabled), OFF (disabled) Actual Value Range: ON, OFF Unit: None Default Value: ON (enabled)
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Parameter Name
Feature ID ID
Feature N Na ame
Parameter ter Descripti ption
Manually set sleeping cell detection (turn off adaptive switch)
WOFD171000
Cell Outage Detection and Recovery - LTE
Meaning: After this parameter is selected, the system monitors cells on the LTE network with the adaptive switch turned off. The values of traffic models in all monitored cells are set manually. Manually set sleeping cell detection (turn off adaptive switch) precedes Manually set sleeping cell detection (turn on adaptive switch). When this feature is enabled, you need to manually set the parameter for cells on the LTE network. This does not affect cells on the GSM and UMTS networks.
GUI Value Range: ON (enabled), OFF (disabled) Actual Value Range: ON, OFF Unit: None Default Value: OFF (disabled) No-traffic period
WOFD171000
threshold (h)
Cell Outage Detection and Recovery - LTE
Meaning: calculates the no-traffic period of of the mon monitored itored ce cell ll in a specified monitoring period. If the accumulated no-traffic period in the cell is greater than the no-traffic period threshold threshold,, the cell is determined to be a sleeping cell. GUI Value Range: 1 to 720 Actual Value Range: 1 to 720 Unit: Hour Default Value: 96
Monitoring period (s) (s)
WOFD171000
Cell Outage Detection and Recovery - LTE
Meaning: calculates the no-traffic period of of the mon monitored itored ce cell ll in a specified monitoring period. If the accumulated no-traffic period in the cell is greater than the no-traffic period threshold threshold,, the cell is determined to be a sleeping cell. GUI Value Range: 0 to 23 Actual Value Range: 0 to 23 Unit: None Default Value: 8 to 20
Estimated cell recovery duration
WOFD171000
Cell Outage Detection and Recovery - LTE
Meaning: specifies the period of time the OSS waits after the cell is automatically restarted. If the cell becomes normal be before fore this timer expires, the OSS considers the cell restored. If not, the OSS considers the cell still in outage. GUI Value Range: 2 to 168 Actual Value Range: 2 to 168 Unit: hour Default Value: 2
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6
Counters
The following performance counters support customization of abnormal KPIs.
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7
Reference Documents
This chapter lists the reference documents related to the Cell Outage Management feature: 1.
eNodeB Initial Configuration Guide
2. 3.
eNodeB KPI Reference eNodeB MO Reference
4.
eNodeB Performance Counter Reference
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5. U2000 Product Documentation (Solaris10): Operation and Maintenance > RAN Management > SON Management > CODR Management
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