1. LTE Probe

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1. LTE Probe 구성

- Probe H/W 구성

2. LTE Probe 특징

- Interface 종류- Call Type 종류

3. LTE Packet Correlation

- xDR Correlation- E2E Correlation

4. Probe 적용 사례

- SKT TANGO-A(T-PANI, Apollo)- LG유플러스 LQMS

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LTE Interface 종류

P-GW

HSS

PCRF

EIR

S1-MME

MME

S6a

S13

S11

SGi

Gx

X2

S1-U

S1-U

UE

MME

S10

S-GW

S5/S8

Gxc

3GPPAAA-Server

S6b

SGSN

HSGW(3G)

Gp S2a

Sp

SWx

eNB

eNB

CSCF

Rx

3GPPAAA-Proxy

SWd

STa

ePCF

ePDG

SWm

WIFI

IMS

1X / EVDO

WCDMARP(A11)

RP(A10)

PDN / Internet

PCF

BTS

RNCNodeB

AP

UE

UE

UE

RP(A11)RP(A10)

BSC

BTS

구분 Interface 비고

User Data S1-U, SGi, Rp(A10)

Signaling X2, S1-MME, S10, S11, S2a, Gp, Rp(A11)

Diameter S13, S6a, Sp, SWx, Rx, Gx, S6b, SWd, Sta, SWm, STa

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LTE Probe 구성

S-Probe(Signal Packet Probe)

D-Probe(User Data Packet Probe)

S1-MME

S6a

S13

SGi

X2

S1-U

S1-U

UE

IMS

P-GW

CSCF

PCRF

HSS

S-GW

MME

EIR

eNB

eNB

S5/S8

S11

Sp

PDN / Internet

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LTE Interface 역활

구분 종류 구간 비고

ControlPlane

RRC Connection 단말 eNB 단말의 무선자원을 통해 기지국과의 연결 설정

S1 Signaling Connection eNB MME 접속을 요청한 단말과 MME 간의 연결 설정

S11 GTPC Signaling Connection MME SGW MME 가 SGW Create Session 요청에 의해 연결

S5 GTPC Signaling Connection SGW PGW SGW 가 PGW 로 Create Session 요청에 의해 연결

ECM Connection 단말 MMERRC Connection 과 S1 Signaling Connection 성립 후 eNB 와 직접 통신을위한 Connection

Data Plane

Radio Bearer(DRB) 단말 eNB 단말과 데이터 전송을 위해 RRC connection Reconfiguration 이후 성립

S1 Bearer eNB SGW eNB 의 데이터 전송을 위해 SGW의 Modify Bearer 응답 이후 성립

S5 Bearer SGW PGW SGW 와 PGW 간 데이터 전송을 위해 PGW의 Create Session Res 이후 성립

EPS Bearer 단말 PGW EPS Bearer = DRB + S1 Bearer + S5 Bearer

UE eNB MME SGW PGW

DataPlane

ControlPlane

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LTE Call Type 종류

Call Type Call Type 별 역활 비고

Attach

Detach

Service Request(MO)

Service Request(MT)

Paging

TAU (Idle)

TAU (Active)

S1 Handover

X2 Handover

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LTE Call Type - Attach

절단호Release Command의 Cause 값으로 판단

User Data

Attach Request

eNB MME S/P-GW

Identification

Authentication / Security

HSS

Create Session

Attach Accept

Initial Context Setup

Attach Complete

Release Request

Application

Release Complete

Release Command

Att

ach

Resp

onse

Tim

e

Att

ach

Call T

ime

Release Bearer

Modify Bearer

시도호

소통호

성공호

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LTE Call Type – Service Request (MO)

Service Request


Initial Context Setup Complete

Release Request

User Data

Release Complete

Release Command

Serv

ice R

equest

Resp

onse

Tim

eServ

ice R

equest

Call T

ime Modify Bearer

Release Bearer

eNB MME S/P-GW HSS Application

시도호

소통호


성공호

- 8 -

LTE Call Type – Service Request (MT)

Service Request


Initial Context Setup Complete

8. Release Request

User Data

11. Release Complete

10. Release Command

Serv

ice R

equest

Resp

onse

Tim

eServ

ice R

equest

Call T

ime

Modify Bearer

9. Release Bearer

User Data

Download Notification

Paging


시도호

소통호

성공호


- 9 -

LTE Call Type – Paging

Service Request (MT)Pagin

g R

esp

onse

Tim

e

PagingCall Time

1. User Data

Download Notification

1차 Paging


2차 Paging

3차 Paging

시도호

성공 : Paging에 이어 SRMT 호 시작실패 : Timeout (20초)

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LTE Call Type – TAU

TAU Request

TAU Accept

TAU Complete

TAU

(I)

Resp

onse

Tim

e

2. ULR / CLR

Release Request

Release Complete

Release Command

TA

U(I)

Call T

ime

Release Bearer

TAU Request

TAU Accept

TAU Complete

TAU

(A)

Resp

onse

Tim

e

ULR / CLR

TAU(A)Call Time

eNB MME S/P-GW HSS

시도호

성공/완료 : GUTI 필드값 미 존재

성공/완료 : GUTI 필드값 존재

eNB MME S/P-GW HSS

LTE Call Type – TAU (Idle) LTE Call Type – TAU (Active)

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LTE Call Type – S1HO

Delete Bearer

HO Required

Modify Bearer

Release Request

User Data

Release Complete

Release Command

S1-H

O T

ime

HO Command

eNB Status Transfer

Source eNB MME S/P-GW HSS Application

시도호

성공호 : Normal Release실패호 : 성공을 제외한 나머지

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LTE Call Type – X2HO

Delete Bearer

Modify Bearer

Release Request

Release Complete

Release Command

Path Switch Request

Path Switch Acknowledge

Source eNB MME S/P-GW ApplicationTarget eNB

시도호

성공호 : Fail Message 수신 시

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LTE Call Type – Detach (Initial UE Detach)

Detach Request

Detach Accept

2. Delete Session

5. Release Complete

4. Release Command

Deta

ch C

all T

ime

Source eNB MME S/P-GW

시도호

성공호 : Detach Request의 Power off = 1 인 경우

성공호 : Detach Request의 Power off = 0 인 경우

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Call Type 별 Correlation

가입자 정보- MIN, IMEI - IMSI, TMSI, GUTI, Mobile IP

장비 별 정보- eNB, MME, SGW IP, PGW IP- EIR, HSS, PCRF etc

가입자 위치 정보- PLMN, MCC, MNC- MME Code, Cell ID- Location History

xDRInterface KPI 지표- Call Time(S1, S11, SGi)- Call Type- Call Result & Fail Reason- QCI, RRC Type

~

•S1 call

•X2 call

•S11 call

•S11 bearer call

•S10 call

•Handover

Correlation

EPC 네트워크에서 Packet 데이터를 추출하여 Call 단위 상세 정보를 수집하고 가입자 단위로 분리하기 위해서 다양한 데이터를 식별해 내야 하고

이 모든 데이터를 Packet 수집과 동시에 실시간으로 Correlation 하여 xDR 을 생성한다.

S/D Probe Server

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xDR Correlation & E2E Correlation

User Data

Attach Request

eNB MME S/P-GW

Identification

Authentication AIA / AIR

HSS

Create SessionAttach Accept


Attach Complete

Release Request

Application

Release Complete

Release Command

Release Bearer

Modify Bearer

S1-MME S11

S6aSgiS1-U

※ 예) Call Type : Attach

S1-MME 의 Probing 데이터 Attach Request

Identification

Authentication / Security

NO S1-MME S11 S6a Sgi / S1-U

1 Attach Request

2 Identification

3 Authentication Create Session AIA / AIR

4 Attach Accept

5 Initial Context Setup

6 Attach Complete Modify Bearer User Data

7 Release Request Release Bearer

8 Release Command

9 Release Complete

• Probing 데이터를 각 Protocol 별 메시지 분류

xDR Correlation

IMSI 1 2 3 4 5 6 7 8 9S1-MME xDR

IMSI 3 6 7S11 xDR

IMSI 3S6a xDRPack

et

Pro

bin

g

IMSI 1 2 3

E2E xDR

3 3 4 5 6 6 7 7 8 9

E2E Correlation

S11 의 Probing 데이터

S6a 의 Probing 데이터

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1. LTE Probe

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