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SC item configuration (On/Off)
SC Result (On) [Off :need manual input]
Example (other Korea operator)
Select automation
PCI auto allocation
Initial neighbor auto-configuration
RACH optimization
Information
Add system
Detail information
Detail information
Cell Management
Information
Auto-allocation/initial neighbor/RACH opti.
State](https://image.slidesharecdn.com/chapspecialaddition-140803083005-phpapp02/75/SON-self-optimized-network-14-2048.jpg)
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eNB ID, eNB IP, LSM IP Manual input
The procedure of manual input
Configuration for eNB environment information
– Mandatory configuration
– BOOTSTATICIP : eNB의 IP address (Information related DHCP)
– BOOTSTATICMASK : BOOTSTATICIP net-mask (Information related DHCP)
– BOOTSTATICGW : BOOTSTATICIP의 GW address (Information related DHCP)
– RS_IP : LSM의 IP
– NE_ID : eNB의 ID
– serverip : LSM의 IP address
– ipaddr : eNB의 IP adress, same configuration with BOOTSTATICIP
– example
eNB Reboot starts
> Retrieve command : getenv [-a] <env_name>
> Configuration command : setenv –p <env_name> <env_value>
root@UAMA:/root> setenv -p NE_ID 9
config string
setenv complete
root@UAMA:/root> getenv NE_ID
NE_ID=9
> reboot](https://image.slidesharecdn.com/chapspecialaddition-140803083005-phpapp02/75/SON-self-optimized-network-15-2048.jpg)
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RO Operation (3/3)
PRACH Data Analysis
Statistic analysis
– Threshold value is configured by operators
RACH Parameter Change
RACH Resource optimization considering RACH load, Handover, Random Access
Delay performance in operating.
– Dedicated Preamble allocation success-ratio
Number of RA Preambles Optimization
– UE Information (Preamble Re-transmission counts + Confliction counts)
PRACH Configuration Index, Power Ramping Step, Preamble Initial Received Target Power
Optimization
1
0.1
0 1 2 3 4 … … i i+1 100 [%]
Dedicated_fail_ratio
tbd
CDF/PDF
Th_de_upper = tbd
Th_de_increase = tbd %
YDed(k)
...](https://image.slidesharecdn.com/chapspecialaddition-140803083005-phpapp02/75/SON-self-optimized-network-35-2048.jpg)
Uploaded bysivakumar D
SON,self optimized network
This document discusses Self-Organizing Network (SON) functions including self-establishment, self-optimization, and self-healing. It provides details on SON structure, functions, operations, and 3GPP specifications. Key points covered include: - SON aims to make telecommunication networks more efficient through automation of tasks like planning, configuration, optimization and healing. - Self-establishment handles initial planning and configuration of eNodeBs. Self-optimization continuously optimizes network parameters. Self-healing detects and compensates for faults. - The document outlines the SON architecture and functions of various 3GPP releases, with focus on self-configuration, neighbor relation optimization, mobility load
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SON,self optimized network
- 1. Distribution EnglishED01 Jae ho, Lee CustomerTraining Center
- 2. 2/35 Contents SON general informationand structure Self-Establishment Self-Optimization
- 3. 3/35 SON function andScope 3GPP SON specification Samsung LTE SON Structure
- 4. 4/35 SON function andScope SON = (Self Planning) + Self Establishment + Self Optimization + (Self Healing) LTE SON Server eNB More Efficient Operation of Telecommunication System OPEX Reduction & Performance Enhancement
- 5. 5/35 SON Technology Scope Self-Planning -Automatically derive few Radio parameters for eNBs which will be established. - Reduce amount of manual pre-planning Activities - Reduce self- configuration errors Network Lifecycle Planning Deployment Optimization Maintenance Self-Configuring - Plug-n-Play Hardware - Self-Configuration Radio Parameters . Initial PCI, . Initial NR, . Initial PRACH configuration - Automatic IP Acquisition - Automatic Neighbor Lists - Automatic Connectivity establishment - Self-test and S/W download Self-Optimizing - Automatic Neighbor Relation Optimization - Mobility Robustness Optimization - Mobility Based Load balancing - RACH optimization - Energy Cost Optimization - Coverage & Capacity Optimization Self-Healing - Auto Cell Outage Detection - Auto Cell Outage Compensation
- 6. 6/35 3GPP SON Specification FunctionContents Spec. Related specification Self- Establishment (Self-Configuration) Automation for eNB installation and initial radio parameter configuration (Initial PCI, Initial Neighbor configuration, Initial PRACH info.) Rel-8 32.501, 32.502, 32.531, 32.532, 32.533, 32.537, 36.300 Self- Optimiza tion Automatic PCI Configuration PCI is automatically allocated and re-allocation for PCI confliction. Rel-8 36.902, 36.300, 36.423 Automatic Neighbor Relation Detect Neighbor Cell automatically and Neighbor Cell List configuration(optimization) Rel-8 32.511, 32.761, 32,762, 32.763, 32.765 36.300, 36.331, 36.413, 36.423 Mobility Robustness Optimization Detect the problem of Handover automatically and HO parameter configuration Rel-9 32.816, 32.521, 32.522, 32.523, 36.902, 36.300, 36.314, 36.423 Mobility Load Balancing Opt. cell reselection /HO parameter optimization for cell traffic load balancing Rel-9 32.816, 32.521, 32.522, 32.523 36.902, 36.300, 36.314, 36.423 RACH Optimization RACH parameter optimization and minimize interference for Access delay and RACH Rel-9 32.521, 32.522, 32.523, 36.902, 36.300, 36.423 Inter Cell Interference Coordination Improvement for edge performance with minimized neighbor-cell interference Rel-8 36.213, 36.214, 36.423 32.521, 32.522, 32.523 Coverage & Capacity Opt. Analyzing the problem of Coverage and Capacity, Cell Coverage and Capacity optimization Rel-10 expected 32.816, 32.521, 32.522, 32.523, 36.902, 36.300, 36.423 Self- Healing Alarm monitoring Real-time monitoring of alarms. Collection & Analysis for correlated information Triggering of self-healing Rel-10 32.541, 32.542, 32.543, 32.823 COD: cell outage detection COR: cell outage recovery COC: cell outage compensation Self-recovery of NE S/W Recover NW S/W to initial states and recent backup states. Self-healing of board fault Detect Board fault and decrease and delete automatically the user impact. Self-healing of cell outage When it happen Cell outage, it stats automatic compensation for network problem (COD, COR, COC) Minimization of Drive-Tests Define the kind of UE measurement, collection method, transmission structure for replacing drive-test. Rel-10 TR 36,805 TS 37.320 Energy Saving Management Down energy cost for providing cell capacity as traffic requests, Rel-10 TR 32.826 (new), TR 36.902 TS 32.551
- 7. 7/35 SON Structure (1): Feature Overview MSS* LSM (EMS) eNB UE Provision Deployment Operation & Maintenance • eNB Provisioning - eNB type, ID, pkg, etc. • eNB Establishment 1. Power On Self Test 2. IP Acquisition (DHCP) - eNB ID, eNB IP, LSM IP 3. eNB Registration 4. SW Download & Check 5. Configuration Download - Initial Radio Parameters 6. S1/X2 Setup (SCTP) 7. RRH Configuration 8. In-service • Self-Configuration - Initial PCI, PRACH, NRT for eNB/Cell •eNB Registration • KPI/Trace Monitoring • PCI/PRACH Collision Resolution • Self-Optimization • Measurements & Reports - Serving/Neighbor Signal Quality - Handover / RACH events Event-based - ANR (Add) - PCI (Contention) - RACH (Collision) HO Statistics-based - ANR (Ranking) - MRO - RACH (# of preambles) RACH Statistics-based - RACH (time, power) Traffic Statistics-based - Load Balancing * MSS shall be provided by operator requirement. • Interface with OSS (Operation Support System) • SON Data Interworking for Inter-LSM - PCI, PRACH, NRT for eNB/Cell groups •Self-Configuration (When it use MSS) - Initial PCI, PRACH, NRT for eNB/Cell MSS: Master SON Server
- 8. 8/35 SON Structure(2) MSS LSM (EMS) eNB SONF OAMCallP Neighbor eNB CallP X2 SETUP REQ/RSP ENB CONF UPDATE SONF SONF SON interface - Inter Vendor, - Inter LSM, - Inter RAT Operator Specific SON interface SON Interface - Self-Configuration - Self-Optimization Configuration Update Operator operation server, Integrated DB, Optimized Server
- 9. 9/35 Master SON ServerFucntion Self Configuration Initial PCI Initial NR Initial PRACH information Support SC and SO function: LSM-LSM or integrity DB Coordination. Initial PCI/RACH/NR information configuration precedure When it deletes Cell/eNB PCI Reconfiguration procedure RSI Reconfiguration procedure P5: After New PCI detection, ECGI obtaining (LSM based) P6: After New ECGI obtaining, NR info. Configuration procedure(UE based)
- 10. 10/35 SON Operation perfunction SON Operation Mode: Off / Manual Apply / Automatic Apply Function SON Operation Off Execute the collection of requested input data, there is no parameter-change. Manual Apply After Operator의 confirm procedure, Parameter-change, Controlled Operation (open loop)in specification Automatic Apply Automatic parameter change, autonomous operation (closed loop) in specification
- 11. 11/35 SON Operation perfunction SON’s Operation Mode per function SON function Off/Manual Apply/Automatic Apply operation PCI • Automatic apply : Initial PCI configuration(auto), X2 monitoring, Detect PCI collision/confusion, PCI re-configuration • Manual apply : Initial PCI Configuration(auto), X2 monitoring, Detect PCI collision/confusion, Request to operators for PCI re- configuration • Off : X2 monitoring ANR • Automatic apply: If New PCI appear, add NR automatically, X2 monitoring, delete NR automatically with detecting neighbor cell and NR-ranking • Manual apply: When it deletes Neighbors based Ranking/X2, Operator의 Request Confirm (Response) of operator • Off: X2 monitoring, NR-ranking starts with collecting Handover statistic data, no NR change RACH • Automatic apply: Change Parameter automatically • Manual apply: Operator-confirm procedure is first and change parameter • Off: X2 monitoring, needed input data collection, No parameter change
- 12. 12/35 SE Procedure SE Provisioning SEOperation HW Test (Power on Self Test) Get eNB ID, eNB IP and LSM (EMS) IP automatically S/W, Loading configuration info. and Validation check S1/X2 auto-configuration RRH Configuration Report Self-Test result
- 13. 13/35 SE Provisioning environment/Configuration Inputsystem basic information eNB Type eNB ID eNB serial number (In case of using DHCP key) MME IP address SC Mode configuration and initial parameter auto-creation Initial Physical Cell Id Initial neighbor information Root Sequence Index
- 14. 14/35 SC item configuration(On/Off) SC Result (On) [Off :need manual input] Example (other Korea operator) Select automation PCI auto allocation Initial neighbor auto-configuration RACH optimization Information Add system Detail information Detail information Cell Management Information Auto-allocation/initial neighbor/RACH opti. State
- 15. 15/35 eNB ID, eNBIP, LSM IP Manual input The procedure of manual input Configuration for eNB environment information – Mandatory configuration – BOOTSTATICIP : eNB의 IP address (Information related DHCP) – BOOTSTATICMASK : BOOTSTATICIP net-mask (Information related DHCP) – BOOTSTATICGW : BOOTSTATICIP의 GW address (Information related DHCP) – RS_IP : LSM의 IP – NE_ID : eNB의 ID – serverip : LSM의 IP address – ipaddr : eNB의 IP adress, same configuration with BOOTSTATICIP – example eNB Reboot starts > Retrieve command : getenv [-a] <env_name> > Configuration command : setenv –p <env_name> <env_value> root@UAMA:/root> setenv -p NE_ID 9 config string setenv complete root@UAMA:/root> getenv NE_ID NE_ID=9 > reboot
- 16. 16/35 Retrieve configuration forS1/X2 S1 auto-configuration and retrieve the status The function for retrieving S1 status X2 auto-configuration and retrieve command The function fort retrieving X2 status Retrieve command : RTRV-S1-STS; Retrieve command : RTRV-X2-STS;
- 17. 17/35 Self Optimization Automatic NeighborRelation ( ANR) Energy Cost Optimization (ECO) Inter Cell Interference Coordination (ICIC) Physical Cell ID Auto Configuration (PCI) Mobility Robustness Optimization (MRO) RACH Optimization (RO)
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- 19. 19/35 ANR Definition Auto managementfor NRT (Neighbor Relation Table) on Handover and Interference Management Self Establishment step: Under Installation, Initial NRT auto-configuration using operating eNB information Self Optimization step: Under operation, Neighbor Add/Ranking/Remove /HO Black list/Recover function of NRT
- 20. 20/35 ANR Operation NRT Add:Add NRT and HO attempt UE UE eNB (Serving Cell) New eNB (Target Cell) UE ⑩ Handover (X2 or S1) ① UE measurement ⑨ X2 set-up ⑥ NRT Udate (Add a new cell) LSM iInitial NRT ⑤ report CGI ⑧ IP address acquisition of the new eNB MME ③ Report CGI Request ⑦ NR report ④ Read CGI② Measurement report (New PCI) ③ Report CGI Request ⑤ Report CGI
- 21. 21/35 ANR Operation NRT Add:Field Test result in Korea 3 times x (Pingpong included) 10 HOs/count = 30 HOs are success 수원플라자 a b g 동수원 a b 매교 a ANR 동작 지역들
- 22. 22/35 ANR Operation Neighbor Ranking InitialNRT: Ranking based on the length between BSs Operating NRT: Ranking based on Handover Attempts, Handover Success Handover Black List Definition: ‘No HO’ field is On and no handover with Neighbors No Relation ‘No HO’ unchecked ‘No HO’ checked NR Add Operation 1. NR add by operator 2. NR add by initial-NRT 3. NR add by UE-MR NR Remove Operation 1. NR remove by operator 2. NR remove by X2 ‘No HO’ attribute ON 1. Manual input by operator 2. NRT Full & NR-ranking 3. HO KPI 4. HO-to-wrong cell ‘No HO’ attribute OFF 1. Manual Input by operator 2. HO-to-black cell NR Remove Operation 1. NR remove by operator 2. NR remove by X2
- 23. 23/35 NRT Construction NRT contains1) TargetCell Identifier (TCI) E-UTAN Cell Global Identifier (ECGI) Physical Cell Identifier (PCI) No Remove: If checked, the eNB shall not remove the Neighbour cell Relation from the NRT. No HO: If checked, the Neighbour cell Relation shall not be used by the eNB for handover reasons. No X2: If checked, the Neighbour Relation shall not use an X2 interface in order to initiate procedures towards the eNB parenting the target cell. 1) 3GPP TS 36.300 Section 22.3.2a Neighbour Detection Function Internal Iinformation RRC Mrmnt reports Mrmnt requests Add/UpdateNeighborRelations NRreport ANR function eNB O&M NRadd NRT Managemnt Function Neighbour Removal Function NRremove NRupdate Neighbor Relation Table 1 2 TCI 3 No Remove TCI#1 TCI#1 No HO No X2 O&M controlled Neighbour Relation Attributes Neighbour Relation NR TCl#1
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- 25. 25/35 ICIC Definition Improvement user’sthroughput decreasing cell interference using radio resource Self Establishment step: not applicable Self Optimization step: In operating, communicate interference information between cells, control interference to allocate limited tx power(radio resource) for users.
- 26. 26/35 ICIC Operation Interference ① X2Load Information (I’m suffering from high interference) ② RSRP measurement (I’m near the neighbor) ③ Tx power optimization (Reduce Tx power!)
- 27. 27/35 PCI Auto-configuration Definition PCIAuto-configuration Operation
- 28. 28/35 PCI Auto-configuration Definition PCI(Physical Cell Identifier): Collision-free, Confusion-free, Unique ID for identify the area for minimize interference between RSs Collision-free: Two neighboring cells should not use the same PCI. Confusion-free: A cell should not have two neighbors with the same PCI Minimize interference among RS (cell-specific Reference Signal) Self Establishment step: under installation, Initial PCI allocation is executed using operating eNB information Self Optimization step: in operating, Detect PCI collision/confusion and re- allocation with exchanging message using X2 interfaces
- 29. 29/35 PCI Auto-configuration Operation PCICharactersitics1) PCI (Ncell ID)는 PCI group (N(1) ID) 과 PCI within PCI group (N(2) ID) – 168 PCI groups * 3 PCIs/group = 504 PCIs – Using the area needed cell specific randomness like DL/UL physical channel scrambling, resource element mapping, cyclic shift, hopping and reference signal generation. Needs optimization for re-using PCI In Seoul 2,065 sites – Main system 1,403 sites – In-building 662 sites 1) 3GPP TR 36.211 (2) ID (1) ID cell ID 3 NNN 650m 650m
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- 31. 31/35 RO Definition Optimized allocationfor RACH resource in Cell Self Establishment step: under installation, executes Initial root sequence index, PRACH configuration index, PRACH configuration offset allocation using operating eNB information Self Optimization step: in operating, – Optimize the number of Dedicated Preamble using Handover statistic data. – PRACH power/opportunity optimization based on UE information statistic data. – Re-allocation after detecting root sequence index collision with exchanging X2 interface messages
- 32. 32/35 RACH Parameters RACH Procedure1) Contention-basedPreamble vs. Dedicated Preamble: Use 64 preambles in each cell. Preamble Initial Received Target Power, Power Ramping Step PRACH Configuration Index … 1) 3GPP TR 36.902, Section 4.7.4
- 33. 33/35 RO Operation (1/3) InitialPRACH parameter auto-configuration1) 1) Initial NRT based on distance 2) Calculates average distance(D) between neighbor cell on Initial NRT 3) Calculation RSI (Root Sequence Index) Reuse Black List – RSI Reuse Black List standard distance = max{ R, n*D} – R: standard distance configured by operators, 0~100 Km, default = 0 Km – n: standard configured by operators, 1~10, default = 2 4) Allocates2) RSI except RCI Reuse Black List – If there is no available RSI, allocate max value of Reuse Distance 5) Allocates PRACH Configuration Index per sector – PRACH Configuration Index: (alpha, beta, gamma) = (3, 4, 5) – Over 4 sectors, allocates additional Root Sequence Index 1) It’s depend on operators 2) High Speed Flag = False (default), Zero Correlated Zone Configuration = 12 (default)
- 34. 34/35 RO Operation (2/3) CollectionPRACH Data Data collection based on X2 Handover Request/Response messages – Dedicated Preamble Assignment Success/Fail Data collection based on UE Information Request/Response messages – Number of Preambles Sent – Contention Detected
- 35. 35/35 RO Operation (3/3) PRACHData Analysis Statistic analysis – Threshold value is configured by operators RACH Parameter Change RACH Resource optimization considering RACH load, Handover, Random Access Delay performance in operating. – Dedicated Preamble allocation success-ratio Number of RA Preambles Optimization – UE Information (Preamble Re-transmission counts + Confliction counts) PRACH Configuration Index, Power Ramping Step, Preamble Initial Received Target Power Optimization 1 0.1 0 1 2 3 4 … … i i+1 100 [%] Dedicated_fail_ratio tbd CDF/PDF Th_de_upper = tbd Th_de_increase = tbd % YDed(k) ...