self-optimizing network (son) 표준현황 · who provides mme pool information ? eutran o&m or...

Self-Optimizing Network

(SON) 표준 현황

2008. 06

삼성전자최성호수석

2/27

SON : Self-Organizing Network

SON (Self Organizing Network)

자동화된 네트워크 운용을 통해 사업자의 OPEX/CAPEX를 최소화시키며, 사업자의 Revenue를 극대화시키는 일련의 기능들과 관련 시스템

Self-Configuration과 Self-Optimization으로 크게 구분

3/27

SON Use Cases

Self-Configuration (SC)

1. Establishment of new eNodeB in Network

2. Automatic Neighbor relation

3. Automated Configuration on Physical Cell ID

Self-Optimization (SO)

1. Load Balancing

2. HO Parameter Optimization

3. Interference Control

4. Capacity and coverage optimization

5. RACH optimization

6. Energy Savings

7. MBMS network optimization

8. QoS Related radio parameters optimization

eNB power on

(or cable connected)

(Pre-operational state)

Self-Configuration

(A) Basic Setup

(B) Initial Radio Configuration

(C) Optimization

(Operational State)

Self-Optimization

4/27

Self-Configuration (SC)1. Establishment of new eNodeB in Network

2. Automatic Neighbor Relation (ANR)

3. Automated Configuration on Physical Cell ID

5/27

1. SC: Establishment of new eNodeB in Network

신규 eNode B 설치 시 자동화 최대화

Cell A Cell B

Cell A Cell B

Add New Cell

New Cells:Provision of initial configurationto cells including neighbour cell list.

New neighbour cell:Modification of neighbour

Cell list configuration

New neighbour cell:Modification of neighbour cell

list configuration

Cell C Cell D

6/27


eNode B에 기본 정보 할당

eNodeB IP address allocation (이슈 1)

Basic information about the transport network (e. g. gateways) environment

The address(es) of the OAM (sub) system(s) providing support for the self-configuration process (e.g. subsystem for software download, subsystem for configuration data download)

The address(es) of the OAM (sub)system(s) providing support for normal OAM functions after completion of the self-configuration process

MME

MME

eUTRANO&M

New

eNB

eNB

S1Em

7/27


eNode B가 O&M subsystem에 접속

eNodeB to OAM: Information about its type, hardware and other relevant data about itself to

the OAM (sub) systems providing support for the self-configuration process

OAM to eNodeB The software is downloaded into the eNodeB

The (transport and radio) configuration data is downloaded into the eNodeB

S1/X2 setup을 위한 정보 포함 (이슈 2/3)

MMEeUTRAN

O&M

New

eNB

eNB

S1Em

8/27


Interface setup

S1 interface (eNodeB – MME) setup (이슈 2)

X2 interface (eNodeB – eNodeB) setup (이슈 3)

The inventory system in the OAM is informed that a new eNodeB is in the field

MMEeUTRAN

O&M

New

eNB

eNB

S1Em

S1

X2

Em

9/27


이슈 1: eNodeB IP address allocation

Getting IP address of different vendor’s eNB/MME in MVR environment

By eNB’s O&M

Vendor A’s eNB O&M shall communicate with other vendor’s eNB O&M

By DNS server

With the specialized FQDN for querying eNB’s IP address

e.g) global_cid.t-mobile.com

MME

eUTRANO&M

New

eNB

eNB

S1

EmeUTRAN

O&M

EmVendor A

Vendor B

?

10/27


Open Issues

Information from eNodeB’s O&M

Definition of eNB global ID

Information from MME to eNodeB Who provides MME pool information ? eUTRAN O&M or MME ?

Whether MME initiated S1 Setup procedure is needed

eNB MME

eUTRAN

O&M

ePC

O&M

?

eNB information ?

- eNB global ID ?

- eNB name ?

- supported TAIs ?

?

MME Information

- Address (IP or FQDN) of MME

- eNB information

- Anything else ? eNB Information

- eNB global ID (Def is FFS)

- eNB name

- supported TAIs

MME Information

- GUMMEI

- MME name

- serving PLMNs

- relative MME capacity

이슈 2: S1 Setup Procedure

11/27


Open Issues

When/How eNB get its globally unique Group ID list ?

Alt1) from eUTRAN O&M

Alt2) during S1 Setup procedure

eNB

eUTRAN

O&M

eNB

eUTRAN

O&M

?

X2 Setup Request

- eNB global ID

- Served cell information

- Globally Unique Group Id list

X2 Setup Response

- eNB global ID

- Served cell information

- Globally Unique Group Id list

이슈 3: X2 Setup Procedure

12/27

2. SC: Automatic Neighbor Relation (ANR)

신규 Cell을 위한 ANR Self Configuration 과정을 통하여 주변 cell 정보 수집

기존 Cell을 위한 ANR Self Optimization 과정을 통하여 주변 cell 정보 수집

Cell A Cell B

Add New Cell

New Cells:Provision of initial configurationto cells including neighbour cell list.

New neighbour cell:Modification of neighbour

Cell list configuration

New neighbour cell:Modification of neighbour cell

list configuration

Cell C Cell D

13/27

2. SC: Automatic Neighbor Relation (ANR)

단말 지원을 통한 ANR 결정 (RAN2)

UE should read below information from BCCH of target cell and report it to source cell

Global Cell Id.

TAC and PLMN list for Intra-LTE ANR

RAC or LAC+RAC for Inter-RAT ANR

eNB

1

eUTRAN

O&M

eNB

2

UE

① eNB2’s phy-CID

② Read request on

GCID, TAC, PLMN list and/or

GSM/UMTS info. ③ Read SI

④ Report

requested Info.

TAC: Tracking Area Code

RAC: Routing Area Code

LAC: Location Area Code

14/27

3. SC: Automated Configuration on Physical Cell ID

O&M 지원 없이 Cell 자체적으로 Physical Cell ID 결정

Collision-free 조건 만족 Phy_ID is unique in the area that the cell covers

Confusion-free 조건 만족 A cell shall not have neighbouring cells with identical Phy_ID

15/27

Self-Optimization (SO)1. Load Balancing

2. HO Parameter Optimization

3. Interference Control

4. Capacity and coverage optimization

5. RACH optimization

6. Energy Savings

7. MBMS network optimization

8. QoS Related radio parameters optimization

16/27

1. SO: Load balancing

주요 이슈 Load Balancing between eNBs for handover optimization

주요 결정사항 Load Reporting procedure

Open Issues Accurate definition of load

What kind of information should be provided ? (R1-080617)

For real-time traffic, usage of PRB for GBR

For non real-time traffic, usage of PRB for UL/DL

What kind of mechanisms can help the optimal load balancing on LTE system? 1

eNB1 eNB2

Resource Status Request

- Registration Request (start, stop)

- Cell to Report List

- Reporting Periodicity

Resource Status Response

Resource Status Update

- Cell Measurement Result (Cell Id, Resource Status)

17/27

2. SO: Handover

Objective: Optimisation of handover parameter

주변셀 정보 : Handover 안되는 cell 삭제핸드오버를 위한 thresholds 값 결정HO 성공율을 높이기 위한 Margins and hysteretic parameter 값 결정

Input source (input optional depending on algorithm): HO trigger reasons

KPIs: cell and neighbour specific HO success/failure rate, cell and neighbour specific Path Loss, Received signal strength and interference measurements before HO events

In ideal: all measurements can be linked with correct location information

Planning data like maps, location of cells, theoretical path loss/interference

Drive test results in proprietary/standardised form

Traces of interfaces (like Abis, Iub, Iu, A)

Actions: Network monitoring

Deriving optimised parameter

Configuration of optimised parameter

Network monitoring and checking success of re-configuration

18/27

3. SO: Interference control 주요 이슈

Prevention of under-utilisation of radio resources.

Counter-balancing of inter-cell interference

주요 결정 사항 LOAD INFORMATION

UL HII (High Interference Indicator) + Target Cell IDs

A2 level report on interference sensitivity per PRB

The occurrence of high interference sensitivity, as seen from the sending eNB

The receiving eNB should try to avoid scheduling cell edge UEs in its cells for the concerned PRBs

UL OI (Overload Indicator)

A report on interference overload per PRB

The interference level experienced by the sending eNB on some resource blocks

The receiving eNB may take such information into account when setting its scheduling policy

Max Tx Power per PRB

An indication per PRB whether DL PRBs Tx power exceeds a threshold (FFS)

The receiving eNB may take such information into account when setting its scheduling policy

Open Issues Whether DL ICIC is needed?

How can remove multi-vendor implementation ?

19/27

4. SO: Coverage and capacity optimisation

Objective Optimization of network coverage

Call drop rates give a first indication for areas with insufficient coverage,

Maximize the system capacity

Traffic counters identify capacity problems

Expected results: Continuous coverage

Increased capacity of the system

Interference reduction

Controlled cell edge performance

Savings on drive tests

Minimized human intervention in network management and optimization tasks

Self-healing in case of equipment (e.g. eNB) failure by automatic reconfiguration of surrounding eNBs

Following parameters are identified as possibly beneficial to be optimised: sub-tones (sub-tone sets planned for cell borders),

antenna tilt,

power settings,

radio resource management parameters

20/27

5. RACH Optimisation

Objective RACH collision probability를 적정 수준으로 유지하여 call setup delay 등 성능 보장

RACH를 위한 resource를 적정 수준으로 유지하여 resource 낭비 없애기

RACH resource unit allocation

RACH preamble split (among dedicated, random-high, random-low)

RACH persistence level and backoff control

RACH transmission power control

주요 input Population under the cell coverage

Call arrival rate

Incoming handover rate

Whether the cell is at the edge of a tracking area

Traffic pattern, as it affects the DRX and UL synchronization states, and hence the need to use RACH

Expected results Reduction on RACH collision probability, which results into:

small call setup delays

small data resuming delays from UL unsynchronized state

small handover delays

high call setup success rate

high handover success rate

Optimisation on the amount of UL resource unit reserved for RACH which brings a positive System Capacity impact.

21/27

6. Energy Savings

Objective: Energy savings based on e.g. cell switch on/off.

Expected outcome: Cuts on operational expenses through energy savings.

Possible solution

Network deactivates

CSG cell

CSG1

cell1

cell3

cell4

cell5

cell2

Step (4): inside CSG1 area

Step (2): inside CSG1 area

UE context

Step (1): outside CSG1 area

Cell1, cell3,

cell5

CSG1 neighb.

area

Step (5): outside CSG1 area

1

2

UE1 is still outside

neighbouring area of

CSG1

4

5

UE1 notifies the network it left

neighbouring area of CSG1

MME

3

6

Network activates

CSG cell

UE1 can detect CSG1 as

it is now active

inactiveNo context(6)

deactivatedUE1: OUT(5)

activeUE1: IN(3)

activatedUE1: IN(2)

inactiveNo context(1)

CSG1 stateMME CSG1

contextCS

G1

UE context (UE1):

UE1 notifies the

network it entered

neighbouring area

of CSG1

CSG1

MME context:

22/27

7. MBMS network optimisation

Objective: Radio 자원의 효율적인 사용 및 유동적인 MBMS 가입자 상태를 반영한 최적의

MBSFN area 설정 및 dynamic shifting 방안 제공

Possible solution Shrink the coverage the MBSFN Area based on the location of MBMS

subscribes

collect the results of UE measurements, and trigger corrective actions in a network element that has a network level view

23/27

표준 현황1. SA WG5

2. RAN WG2/3

24/27

SON Architecture

MMEMME

eUTRAN

O&M

eUTRAN

O&M

eNB

eNB

eNBePC

O&MMMEMME

X2

X2

S1

S1

S1

Em

Em

Em

Em

Em

RAN2/RAN3 SON AreaSA5 SON Area SA5 SON Area

NMS NMS

N

N

N

ePC

O&M

N

3개의 WG에서 표준화 진행 중

SA WG5: O&M 관련 표준

RAN WG3: eNB간, eNB와 MME interface 표준

RAN WG2: 단말과 eNB간 interface 표준

25/27

O&M SON Working Scope : 3GPP SA WG5

Title Spec Schedule Main Scope

Self-Configuration of

eNodeBs

TS 32.xyz2009.03

- Analysis of self-configuration (atomic) functions

- Construction of logical block for SC

- Definition of management reference model

- Definition of requirement / interface

- Definition of security mechanism.

SON Self-Optimization

& Self-Healing OAM

Requirements

TS 32.xyz2008.12

- Collection of Self-Optimization Requirement on

> Load Balancing

> HO Parameter Optimization

> Interference Control, …

SON Neighbour

Relation OAM

Requirements

TS 32.771

TS 32.772

TS 32.773

TS 32.775

2009.03

- Collection and summary of eNodeB Neighbour

Relation Management requirements on

> Intra E-UTRAN relations

> E-UTRAN to 2G relations

> E-UTRAN to 3G relations

- Definition of the SON Network Resource Model

- Definition of CORBA

- Definition of XML file format definition

Study on Self-healing

of Self-Organizing

Networks (SON)TR 32.8xy 2009.03

- Investigate the solution of self-healing

- Collect the requirements for self-healing

26/27

RRM-SON Working Scope : RAN2/RAN3

Title Spec Schedule Main Scope

LTE E-UTRA and E-

UTRAN Overall

Description; stage2

TS 36.300 2008.09 - Self-Configuration and Self-Optimization Stage2

Self-configuring and

self-optimizing network

use cases and solutions

TR 32.902 2008.06- Self-configuration and self-optimization use cases and

solutions

LTE Radio Resource

Control (RRC)TS 36.331 2008.09

- UE-eNB간 Self-Configuration/Self-Optimization 관련 이슈들에 대한 솔루션

LTE S1 Application

Protocol(S1AP)TS 36.413 2008.09

- S1 interface (eNB-MME) 상의 self-configuration/self-

optimization 관련 이슈들에 대한 솔루션 제공

LTE X2 Application

Protocol(X2AP)TS 36.423 2008.09

- X2 interface (eNB-eNB) 상의 self-configuration/self-

optimization 관련 이슈들에 대한 솔루션 제공

3GPP Web Page: http://www.3gpp.org

http://www.3gpp.org/

27/27

Thank you [email protected]

self-optimizing network (son) 표준현황 · who provides mme pool information ? eutran o&m or...

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