SON - 工業技術研究院

Introduction to ITRI’s SON Technology
Copyright 2015 ITRI 工業技術研究院
1
LTE Small Cell System Architecture
• Standard LTE protocol stack according to 3GPP spec
– UU Interface: PHY, MAC, RLC, PDCP and RRC Protocol
– Networking Interface: S1 and X2 protocol
• Key features of System Software
– Radio Resource Management
– Self Organizing Network
RRM/SON
Small Cell
Ctrl.
Plane
RRC
UE
PDCP
X2 S1
AP AP
NAS
RRC
PDCP
RLC
MAC
PHY
RLC
SCTP
MAC
IP
PHY
L1/L2
Uu
Small Cell
X2-AP
SCTP
IP
L1/L2
X2-C
Multi-RAT GW
S1-AP
SCTP
IP
L1/L2
S1-AP
SCTP
IP
L1/L2
S1-MME
TR-069
Copyright 2015 ITRI 工業技術研究院
2
ITRI Small Cell 主要研發項目
Radio Resource Management
•Dynamic admission control
•Dynamic radio bearer control
•Bandwidth traffic control (backhaul
and air interface)
•Backhauling QoS control (diffserv code
point marking)
•Seamless/Lossless handover control
•Local IP Access (LIPA) Control
•Selected IP Traffic Offload (SIPTO)
Management
OAM
Self Organizing Network
•Optimized PCI selection
•Neighbor relation strategy
•Optimized TX power setting for UL
and DL for interference control
•Optimized cell selection /
reselection parameters
•Handover optimization
•Multi-RAT loading balance
•Multi-RAT power saving
SQLite
SON
Common
Utility
L3 RRM
Control Software
RRC
GTP-U
S1AP
X2AP
PDCP
RLC
UDCP
SCTP
MAC
Copyright 2015 ITRI 工業技術研究院
3
ITRI Advanced RRM Differentiation
• QoS management
– Backhauling QoS Control
(Diffserv Code Point Marking)
– Bandwidth Traffic Control
Traffic
Control
6000
5000
Traffic
Control
4000
UE1
3000
UE2
2000
UE3
1000
0
1
14 27 40 53 66 79 92 105 118 131 144 157 170 183 196 209 222 235
• Efficient Traffic offload
– Local IP Access (LIPA) Control
– Selected IP Traffic Offload (SIPTO)
Management
• Mobility and user experience
– Seamless/Lossless Handover Control
by QoS
– GTP-U Data Forwarding
– PDCP Packet Returned Pass
Copyright 2015 ITRI 工業技術研究院
4
ITRI Advanced RRM Features
RRM Functions
Description
RAC (Radio Admission Control)
•
•
•
•
UE Connection Admission Control by Num. of Users
UE Connection Admission Control by Num. of Bears
Dedicated E-RAB Admission Control
Handover Admission Control
RBC (Radio Bearer Control)
•
•
•
•
Management of Radio Bearer by Priority
Management of Radio Bearer by Bandwidth
Management of Radio Bearer by Preemption Capability
Management of Radio Bearer by Preemption Vulnerability
Connection Mobility Control
•
•
•
UE Cell Re-selection Control
UE S1/X2 Handover Control
Seamless/Lossless Handover Control by QoS *
Load Balancing
•
•
Loading Balancing for Idle Mode User
Loading Balancing for Active Mode User
Value Added Functions
•
•
•
•
Local IP Access (LIPA) Control
Selected IP Traffic Offload (SIPTO) Management
Backhauling QoS Control (Diffserv Code Point Marking)
Bandwidth Traffic Control
Copyright 2015 ITRI 工業技術研究院
* Released in 2015
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Outline
ITRI’s Small Cell System Software: SON & RRM
Self Organizing Network
Automated Configuration of PCI
Automated Neighbor Relation (ANR)
Mobility Load Balancing (MLB)
Mobility Robustness Optimization (MRO)
Inter-Cell Interference Coordination (ICIC)
Enhanced Inter-Cell Interference Coordination (eICIC)
Minimization of Drive Tests (MDT)
RACH Optimization (RO)
Cell Outage & Compensation
SON Testbed Environment
Copyright 2015 ITRI 工業技術研究院
6
SON (Self-Organizing Network)
 SON的作用:
 Heterogeneous Network (HetNet)的網路形成，基地台將越來越多、越來越小
 電信營運商的成本來源: CapEx 與OpEX
→ SON: 基地台的自動設定/效能優化
Copyright 2015 ITRI 工業技術研究院
7
SON的流程
Copyright 2015 ITRI 工業技術研究院
8
ITRI SON Architecture
Centralized SON
Distributed SON
Centralized
OAM
Centralized
OAM
SON
eNB
SON
X2
eNB
eNB
X2
eNB
SON
全域規劃能力
沒有
支援
基地台間互相協調
需要
不需要
建置成本
低
高 (需要具容錯能力的高效能伺服器)
建置複雜度
低
(只需安裝基地台)
高
(需要安裝SON Server)
Copyright 2015 ITRI 工業技術研究院
* Released in 2015
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ITRI Advanced SON Differentiation (1/2)
• Multiple cells coexistence
Advanced eICIC for
Active/ Idle Users
Enhance to handle 14 PCI collision
scenarios
Handover Optimization for Smart Antenna
Copyright 2015 ITRI 工業技術研究院
10
ITRI Advanced SON Differentiation (2/2)
• Multi-RAT cooperation
LTE-A/Wi-Fi Load Balancing
Multi-RAT Power Saving
Multi-RAT GW
(SON Server)
Multi-RAT GW
(SON Server)
LTE Small
Cell
LTE Small
Cell
Wi-Fi AP
Wi-Fi AP
Peak Traffic
Copyright 2015 ITRI 工業技術研究院
Off-Peak Traffic
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ITRI Advanced SON Features
SON Functions
Description
PCI (Physical Cell ID)
•
•
•
•
•
Physical Cell ID Assignment
PCI Collision Handling
Existing Cell PCI Confuse Handling
New Cell PCI Confuse Handling
Enhanced PCI Handling
ANR (Automatic Neighbor Relation)
•
Automatic Neighbor Relation Establishment/Maintenance/Optimization
MRO (Mobility Robustness
Optimization)
•
•
•
•
•
Cell Re-selection of Mobility Robustness Optimization
Too Late/ Early Handover of Mobility Robustness Optimization
Handover to Wrong Cell of Mobility Robustness Optimization
Ping-Pong Effect of Mobility Robustness Optimization
Smart Antenna based MRO
MLB (Mobility Load Balancing)
•
Mobility Load Balancing for Active/Idle Users
RO (RACH Optimization) *
•
Contention Based/Contention Free RACH Optimization
ICIC (Inter-Cell Interference
Coordination)
•
•
Omni Antenna ICIC (Hard/Fractional*/Soft* Frequency Reuse )
Smart Antenna ICIC*
eICIC (Enhanced Inter-Cell
Interference Coordination )*
•
Use power, frequency and also time domain to mitigate intra-frequency interference in
heterogeneous networks
Advanced eICIC for Active Users
Advanced eICIC for Idle Users
MDT (Minimization of Drive Tests)*
•
Utilizes the user equipment (UE) to collect field measurements, including radio
measurements
Cell Outage & Compensation
•
Automating outage detection and problem resolution
Multi-RAT SON
•
•
LTE-A/Wi-Fi Load Balancing
Multi-RAT Power Saving *
Copyright 2015 ITRI 工業技術研究院
•
•
* Released in 2015 12
SON Testbed Environment
Testbed
Outdoor:
• Campus-wide coverage
• Parking lot, sport fields, roads
• 0.42 Km2
• Average 4,000 people
Hotspot:
• Stores, Restaurants, Food Court
• Laboratories and Office Rooms
• Post Office
• Bank
• 200 x 170 Square Meters
• First Floor and Underground Floor
• Peak Times: 3000 people
• Off-peak Times: 100 people
Mobility:
• Driving and walking
• Speed Limit: 30Km/h
• Max. 900 Meters Straight Lane
• Various moving directions
Indoor:
• Laboratories and Office Rooms
• Venue and Meeting Rooms
• Lecture Hall
• Lobby
• Deep indoor (e.g. Basement)
• 100 x 35 Square Meters
• 3 Stories High
• Average 800 people
Copyright 2015 ITRI 工業技術研究院
13
Current Testbed
Testbed (2014)
Indoor Hotspot:
• Testbed Equipment
- Small cell x 15
- Wi-Fi AP x 20
• Scenario
- Laboratories and office
- Venue and meeting room
- Lobby, corridor
• Test Feature
- Multi-RAT SON
- SON Plug and Play, RRM
Outdoor:
• Testbed Equipment
- Macro cell x 4
• Scenario
- Open area coverage and
capacity
• Test Feature
- Handover, MRO, MLB
- Interference, ICIC, eICIC
Indoor:
• Testbed Specification
- Small cell x 3
• Scenario
- Lab, Gallery
• Feature
- Core Network IOT
- SON Server IOT
Copyright 2015 ITRI 工業技術研究院
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Q&A
Copyright 2015 ITRI 工業技術研究院
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