Handover Technologies over Multiple Wireless/Mobile …C1%… · · 2012-03-20Handover...
Transcript of Handover Technologies over Multiple Wireless/Mobile …C1%… · · 2012-03-20Handover...
Handover Technologies over Multiple
Wireless/Mobile Networks
조일권
KRnet 20102
목차
3rd Phase BcN Trial Service Project
Vertical Handover Technology
VHO Implementation
Summary & Discussion
3rd Phase BcN Trial Service Project
KRnet 20104
BcN concept & architecture
Unified single IP network - All IP network
Converged services
Reduce CAPEX & OPEX
ITU-T의 NGN
PS
TN
Wir
ele
ss
Inte
rne
t/D
ata
CA
TV
Service and Control
Packet Transport
Wireless Broadcast
Wired
Service and Control layer
Transport layer
Subscriber’s network layer
Home & Equipment layer
3rd
Phase 1st & 2nd
Phase
KRnet 20105
ITU-T의 NGN architecture (R1)
Service 평면과 Transport 평면
Transport 평면: NACF, RACFApplications
Application Support Functions
& Service Support Functions
Resource and
Admission
Control Functions
(RACF)
Transport Functions
Transport Control Functions
Service Control FunctionsService user
profiles
Transport user
profiles
Network Attachment
Control Functions (NACF)
Service Stratum
Transport Stratum
Other
Networks
Management
Functions
End-user
functions
NNI
UNI
ANI
Control Media Management
KRnet 20107
Project Phases
1st Phase(’04~’05year) : driven by new converged services
2nd Phase(’06~’07year) : driven by QoS
3rd Phase(’08~’10year) : driven by VHO
Network Convergence
Direction
of
BcN Pilot
Project
Promote broadband
by means of developing
new converged services
Service Convergence
Promote constructing
QoS supported network
and Commercializing
Promote QPS and
network convergence
by means of VHO and
QoS control
BcN
Construction
Primary Plan
1st Phase: Base
Each phase of BcN
2nd Phase: Stride 3rd Phase: Complete
KRnet 20108
2nd Phase network
BcN Transport Architecture
음성영상전화, IPTV, Virtual leased line, WiMAX traffics
SER
Residential Gateway
Service EdgeRouter
IP-VDSLMetro Ethernet(LAN)
FTTH
50~100Mbps broadband subscriber’s line
Internet Core
802.1P / Diffserv(Priority / DSCP)
Diffserv (DSCP)
Diffserv over MPLS(Exp)
RGW
NGN Core
QoS Enabling points
DiffServ
802.1p DiffServ
DiffServ over
MPLSDiffServ
802.1p
KRnet 20109
3rd Phase
2nd phase 유무선통합 시도영상전화(VoIP) 유무선간 연동 (유무선 IMS 연동)
Wired service provider, wireless service provider
방송통신 설비사업, 자원기반 사업전략, 유선무선 사업경계
3rd phase 환경
유무선사업자 인수, 합병 (SKT/SKB, KT, LGT~LGUplus)
유무선통합전략, 타산업분야 진출전략
네트워크 통합/관리
유선가입자망의 광역국사화
유선광역국사의 무선국사 흡수
전송망의 공유
서비스(콘텐츠) 컨버전스 제공 환경
FMC 서비스와 표준기술
KRnet 201010
ITU-T의 NGN architecture (R2)
Transport 평면에 MMCF 추가Mobility Management Control Function (위치관리, 핸드오버관리)
KRnet 201011
BcN 시범사업 로드맵
Concept
2004 2005 2006 2007
2008 2009 2010
IMS
Wired-centric
Promotion
Wired & wireless Convergence
Promotion
DevelopServices
음성전화
DCATV
Inter-operWired & mobileVideo telephony
FTTHFTTHDOCSIS QoS OpenAPI
IPTV
VideoIP telephony
VHO Femto IMS-SC
FMS
FMCmVoIP
mIPTV
4screen
QoS
Yr
KRnet 201012
3rd Phase 주요 내용
FMC, FMS, ISC
Vertical Handover (FMC (2.0))
FemtoCell (FMS 2.0)
Session Continuity (ISC)
Multi-mode device-based mobilityWiFi & EVDO, WiMAX & HSPA (& WiFi)
WiMAX Femto
Multi-screen-based Communication session mobility
Vertical Handover Technologies
3GPP
IEEE
IETF
KRnet 201014
VHO types – layer별 분류
서비스 요구사항과 Layer에 따른 구현 범위
Inter domain
Inter Subnet
Inter RAT
Intra domain
Intra Subnet
Intra RAT
Application &
Session Control
Service
Continuity Fast/Seamless
KRnet 201015
Domain, Subnet, RAT
서비스 요구사항Service continuity : user의 인식 허용
Fast/seamless
DomainAdministration domain
인증, 과금
연동 or 통합 접근
Subnet Flat network or subnet 환경
IP mobility
RATRadio Access Technologies (Heterogeneous)
Candidate RAT : WiBro, HSPA, WiFi
KRnet 201016
VHO관련 표준기술
3GPP/2, IEEE, IETF 요소기술 측면 ISC (<< VCC)
MIP 계열
MIH (802.21)
RAS
Node B
AP
Media
IP
Service
&
Session
IEEE
Media Independe Handover
IETF
Mobile IP family
3GPP/IMS
VCC, ISC
HSPA
EVDOWiBro WLAN
KRnet 201017
3GPP 접근방향(1)
3GPP와 WiFi
I-WAN (3GPP R6) : WAG, PDG (SGSN, GGSN 대체 – 코어망)
PS domain target
GAN (Generic Access Network) ~ UMA
Voice, PS, GAN을 (GANC를 통해) 3GPP AN과 동일하게 취급
자료: 참고문헌 3자료: 참고문헌 1 자료: 참고문헌 3
KRnet 201018
3GPP 접근방향(2)
3GPP EPC (R8)
3GPP legacy, WiMAX, WLAN를 수용
자료: 참고문헌 4
KRnet 201019
3GPP 접근방향(3)
EPC가 WIMAX CSN을 흡수WiMAX network architecture (CSN: AAA, HA, DHCP)
자료: 참고문헌 4
KRnet 201020
3GPP 접근방향(4)
ANDSF : Access Network Discovery & Selection
PCRF : Policy & Charging Rule
FAF : Forward Authentication (3GPP access & resource allocation)
자료: 참고문헌 4, 5
WiMAX
PCC
3GPP R8
PCC
KRnet 201021
IEEE의 접근방향(1)
802 component to other handover standards
IEEE
802.11 VHT
802.16m
3GPP
VCCI-WLAN
SAE-LTE
IEEE 802.21• Digital Broadcast Handover• Muti-Radio Power Mgmt.• Security Signaling• Emergency Services
IETF
PMIPFMIPSIP
HIPNETLMM
HoKEY MIPSHOP
DMB DVB-H
MediaFLO
802.15
자료: 참고문헌 8
KRnet 201022
IEEE의 접근방향(2)
IEEE 802.16 & 802.11
MAN과 LAN간의 VHO를 결합한 4G 모델
자료: 참고문헌 11Opt. 4, 5: handover policy (profile)
KRnet 201023
IEEE의 접근방향(3)
3GPP EPC 모델에서 MIH deployment (Multi-PoS, IS)
자료: 참고문헌 16
KRnet 201024
MIH msg flows (1)
Handover Initiation State (WiMAX > (E)UTRAN)
Handover 시작의 기준이 되는 threshold 설정
Ready
자료: 참고문헌 16
KRnet 201025
MIH msg flows (2)
Handover Preparation State 주변 PoA 정보수집, PoA를 스캔, target PoS/PoA rsc 검사, 확정, 예약
KRnet 201026
MIH msg flows (3)
Handover Execution
핸드오버시작, IP할당 및 Binding Update, 핸드오버완료
KRnet 201027
IETF 접근방향(1)
Network layer consistency (Mobile IP series)
자료: 참고문헌 14
KRnet 201028
IETF 접근방향(2)
단말기반에서 네트워크기반으로 (Proxy Mobile IP)
자료: 참고문헌 15
KRnet 201029
IETF 접근방향(3)
3GPP EPC 모델에서 PMIP deployment
자료: 참고문헌 7
VHO Implementation
Case 1 (KwangGaeto Consortium)
Case 2 (Ubinet Consortium)
Case 3 (Octave Consortium)
KRnet 201031
MIH user = MIP
MN Serving Network Candidate Network OtherOther
IP MIH L2Up MIIS UP entityL2 MIH IP L2 MIH IP
Information Query & Resource Available CheckMIH_Get_Information_Request, MIH_Get_Information_Response
MIH_Net_HO_Candidate_Query
MIH_N2N_HO_Query_Resources
Resource Preparation
MIH_Net_HO_Commit
MIH_N2N_HO_Commit
L2 Connection
Link Up
MIH_Link_Going_Down
RA, BU, RR
MIH_Link_Up
L3 Connection
Resource ReleaseMIH_HO_Complete
MIH_N2N_Complete
KRnet 201032
MIH user = PMIP
MN Serving Network Candidate Network OtherOther
IP MIH L2Up MIIS UP entityL2 MIH IP L2 MIH IP
Information Query & Resource Available CheckMIH_Get_Information_Request, MIH_Get_Information_Response
MIH_Net_HO_Candidate_Query
MIH_N2N_HO_Query_Resources
Resource Preparation
MIH_Net_HO_Commit
MIH_N2N_HO_Commit
L2 Connection
Link Up
MIH_Link_Going_Down
PBU, RA, RR
MIH_Link_Up
L3 Connection
Resource ReleaseMIH_HO_Complete
MIH_N2N_Complete
KRnet 201033
MIH user = FMIP
MN Serving Network Candidate Network OtherOther
IP MIH L2Up MIIS UP entityL2 MIH IP L2 MIH IP
Information Query & Resource Available CheckMIH_Get_Information_Request, MIH_Get_Information_Response
MIH_Net_HO_Candidate_Query
MIH_N2N_HO_Query_Resources
Resource Preparation
MIH_Net_HO_Commit
MIH_N2N_HO_Commit
L2 Connection
Link Up &Resource Release
MIH_Link_Going_Down
FBU
RA (NCoA)
Packet Forwarding
FNA
MIH_Link_Up
MIH_HO_Complete
MIH_N2N_Complete
HI
Case 1 (KGT)
- WiFi & CDMA PS VHO
자료: 참고문헌 19
배경
Target Service:
모바일 IPTV(unicast) 접근을 위해 VoD 서비스부터 출발
IMS기반의 mVoIP 고려
ISP 사업자 입장에서 적극적인 접근이동망과의 통합적인 시각보다 ISP가 handling 가능한 시각에서 기
술을 고려하는 것부터 출발
IP mobility : Mobile IP와 유사한 Proprietary protocol (xGMIP)을 적용하여 해당 network If에 맞게 customizing, Kernel level 동작, 안정화, MIH integration 등 상용수준으로 upgrade
Test-bed architecture
WiFi/EVDO
MIH single PoS
xGMIP Dual CoA &
Dual tunnel
@handover
CoA binding used
like MIP
Operating in
xGMIP protocol
aware domain AP(Non-PoS)
Wi-Fi
CDMA EVDO
handover
기지국
Access network(Wi-Fi)
Access network(3GPP2)
EvDO-PDSN (Non-PoS)
MIH capabile MN
Home Network
MIH PoSInformation Server
xGMIP Server
TGW
InformationDB Server
모바일 IPTV Server
xGMIP protocol msg flow
LMC(MN) Serving Network CNLMS
IPLMC LMS TGWIPLink #1 Link #2 Link #1
Candidate Network
IPLink #2 IPLink
Tunnel RequestTunnel Create (#1)
TC Ack
BU Ack
Link Access (L2 Connection and CoA#1 Allocation)
Link Access (L2 Connection and CoA#2 Allocation)
Tunnel Delete (#1),TD Ack
Tunnel #1
Tunnel Create (#2)
TC Ack
Vertical Handover
Binding Update (life time = 0, tunnel #1),
Tunnel Response
BU Ack
Binding Update
Link State Event
Tunnel Request
Tunnel Response
Tunnel #1 via Serving Network
Tunnel #2 via Candidate Network BU Ack
Binding Update
WiFi start MIH session
MN MIH Svr
MIH_Register Request
MIH_Register Response
MIH_Push_Information
WiFiCDMA xGMIP Svr
WiFi 접속
xGMIP
xGMIP 등록
MIH
WiFi to EVDO Handover
MN MIH SvrxGMIP Svr
Link going down
xGMIP Tunnel make
MIH_MN_HO_Complete Request
MIH_MN_HO_Complete Response
WiFiCDMA
xGMIP
EVDO start MIH session
xGMIP
xGMIP Regi.
MN MIH Svr
MIH_Register Request
MIH_Register Response
MIH_Push_Information
WiFiCDMA xGMIP Svr
EvDO CDMA 접속
EVDO to WiFi Handover
xGMIP Tunnel make
xGMIP
MN MIH SvrxGMIP Svr
MIH_Net_HO_Commit Request
MIH_Net_HO_Commit Response
MIH_MN_HO_Complete Request
MIH_MN_HO_Complete Response
WiFiCDMA
WiFi 접속 (CoA-W)
Case 2 (UN)
- WiBro & WCDMA PS VHO (1)
자료: 참고문헌 18
배경
CDMA
WCDMA
WiBro
GSM (+ GPRS, EDGE)CDMA (+ 1x, EVDO, Rev.A)WCDMA (+ HSDPA, HSUPA)WiBro (+ Wave 2)WLAN (a/b/g/n)
GSMCDMA
망 구축 현황
GSM (+ GPRS, EDGE)CDMA (+ 1x, EVDO, Rev.A)WCDMA (+ HSDPA, HSUPA)WiBro (+ Wave 2)WLAN (a/b/g/n)
+
HSPA+LTE (+ LTE Advanced)802.16m
망 구축 현황망 구축 현황
CDMACDMA + WCDMA + WiBro
(1x, EVDO) (HSDPA/UPA) (Wave2)+ ?
시험망 architecture
Target Service : 무선 인터넷MIH: Single POS(MIH Server), MIP: CMIP(WCDMA), PMIP(WiBro)
ㅇMIH- IEEE 802.21-2008
ㅇMobile IP- RFC 3344, ―IP Mobility Support for IPv4‖
- RFC 3024, ―Reverse Tunneling for Mobile IP‖
- RFC 3519, ―Mobile IP Traversal of Network- Address Translation(NAT) Devices‖
MIH 서버
첫째 수준WiBro => WCDMA 단방향만을 고려
이후 WCDMA => WiBro를 고려
Policy : user profile (WiBro preferred, WiBro only, WCDMA only)
hard handover (BBM mechanism)
단말 구현
USB dongle
Low power design – dual interface operation
MIP client
UDP/TCP/IP
WiBro stack
Windows APIs
AT commands
(over dedicated COM port
using Windows APIs)
C function calls
Provided by 3rd
party
Provided by InterDigital
Network Connection Controller
PC
USB
Dongle
Legend
C function calls
C function calls
SKT User Interface
WiBro Device
Driver
MIH
Messaging
Protocol(Communication with
server, Transmission
control)WiBro
Interface
Mobility Policy (Mobile-controlled or
Network-controlled handovers,
Error-handling, Etc.)80
2.2
1
Mo
bilit
y C
lie
nt Mobile IP InterfaceNCC Interface
OS
Abstraction
Layer(Timer control,
Threads, Tracing,
Etc.)WCDMA Interface
WCDMA Link Handler
CDMA2000 stack
CDMA2000 Interface
CDMA2000 Link Handler
계측기
DM 툴 (Dignostic Monitor)
WiBro, WCDMA if, MIH의 log를 분석
WiBro start MIH session
MIH MN HAWCDMA (FA)WiBro (FA)
WiBro Link Setup (Authenticate)(WiBro Preferred Mode)
MIP Registration Procedure
MIH Capability Discovery Procedure
MIH Registration Procedure
MIH Event Subscription Procedure (LinkType=WiBro)
IMS
DOMAIN
IMS Registration Procedure
Extract MIH Policy DB
(based on BSID)
MIHS
Data FlowData FlowData Flow
MIH Link Configure Thresholds Procedure (LinkType=WiBro)
IMS Session Starts
MIH Event Subscription Procedure (LinkType=WCDMA)
MIH Link Configure Thresholds Procedure (LinkType=WCDMA)
WCMA start MIH session
HA MIHS
MIH MN WCDMA (FA)WiBro (FA)
WCDMA Link Setup (Authenticate)(Non WiBro Area or WCDMA Preferred Mode)
MIP Registration Procedure
MIH Capability Discovery Procedure
MIH Registration Procedure
IMS
DOMAIN
IMS RegistrationProcedure
Extract MIH Policy DB
(based on Cell ID)
MIH Link Configure Thresholds Procedure (LinkType=WiBro)
Data FlowData FlowData Flow
IMS Session Starts
MIH Event Subscription Procedure (LinkType=WiBro)
MIH Event Subscription Procedure (LinkType=WCDMA)
WiBro to WCDMA handover
HA MIHS
MIH MN WCDMA (FA)WiBro (FA)
IMS
DOMAIN
WiBro Setup
WCDMA Link Setup
MIP Binding Update Procedure
MIH_Net_HO_Commit.response
Data Flow switched
from WiBro to WCDMA
Tear Down Wibro L2 Link
MIH_Net_HO_Commit.request (Link type=WCDMA)
WCDMA started in IDLE
mode for handover
Success of WCDMA
System Information
Acquisition
Data FlowData FlowData Flow
Extract MIH Policy DB
(based on BSID)
WCDMA
MIH Registration Procedure (Re-registration, promptly regardless of ValidTimeInterval)
MIH Link Configure Thresholds Procedure (LinkType=WiBro)
Back-Off Timer Starts
Get MN’s Location
Information through MIH
Registration Procedure
or MIH Link Event
Messages
WCDMA to WiBro handover
MIH MN HAWCDMA (FA)WiBro (FA)
IMS
DOMAIN
MIHS
MIH_Net_HO_Commit.request (Link type=WiBro)
MIH Registration Procedure (Re-registration, promptly regardless of ValidTimeInterval)
MIH Link Configure Thresholds Procedure (LinkType=WiBro)
Extract MIH Policy DB
(based on Cell ID)
WiBro
WiBro started in IDLE
mode for handover
WiBro Link Detection Success
WiBro Link Setup
MIP Binding Update Procedure
MIH_Net_HO_Commit.response
Tear Down WCDMA L2 Link
Data FlowData FlowData Flow
Data Flow switched
from WCDMA to WiBro
WCDMA Setup
Get MN’s Location
Information through MIH
Registration or MIH
Information Service
Procedure
MIH Link Configure Thresholds Procedure (LinkType=WCDMA)
Back-Off Timer Starts
Case 3 (OV)
- WiBro & WCDMA PS VHO (2)
자료: 참고문헌 18
배경
Target Service
모바일 IPTV (from unicast ~)
양방향 방송모바일 VoIP (to prepare 4G..)
WCDMA, WiBro를 통해서 feasibility test
시장별 두가지 접근을 배경으로 했음WCDMA, WiBro, (WiFi)
기업시장 : MIH + MOBIKE (VPN)
MOBIKE ~ mobile IKE (Internet Key Exchange)
개인시장: MIH + CMIP
Business needs가 상대적으로 약한 것으로 보임
시험망 architecture
IP Premium 망WCDMA
WIBRO
xDSL/FTTH
IMS
IMS
Mobile IPTV Service Platform
VHO Platform
인코딩 서버
메뉴관리 서버
실시간 변환서버
DB
스트리밍 서버
MIH정책서버(MMCS)
MobilityG/W
Home Agent
Policy & Spec.
Policy profile User profile :
접속망 선호정책 : WiBro Preferred, WCDMA Preferred
서비스 기반선호 정책 : 응용프로그램별로 지정 Operator profile : non
참고 specification MIH (Single PoS)
IEEE 802.21-2008, ―IEEE Standard for Local and metropolitan area networks—Part 21: Media Independent Handover Services"
Client MIP RFC 3344, ―IP Mobility Support for IPv4‖
RFC 3024, ―Reverse Tunneling for Mobile IP‖
RFC 3519, ―Mobile IP Traversal of Network Address Translation (NAT) Devices‖
MOBIKE RFC 4555, ―IKEv2 Mobility and Multihoming Protocol (MOBIKE)‖
단말 구현 모델
Target 단말: 넷북 (USB dongles, each If)
MIH + Mobike
MIH + CMIP
Mobile IP Manager
UI (User Interface)
Handover/Binding Management
(MIH 연동)Key Management
Device/IP Management Protocol Management
Main Control
Module
Encapsulation Module Decapsulation Module
Network Interface Binding Management
User
Level
Kernel
Level
CMIPv4 IM Driver
Windows IOCTL
Windows Socket
(UDP)
Proxy ARP WiBro HSDPA WiFi
CMIPv4 Virtual Driver
Mobike
Mobile IKEv2
Security Association 유지
SA 재설정으로 인한 interrupt time을 최소화와 session 유지
IP mobility
Multi-homing
Summary & Discussion
Summary
3단계 시범사업 - 유무선통합 FMC
FMS
MultiScreen – session continuity
VHO 기술 IMS session, Mobile IP, MIH/OMA-DM
3GPP, IETF, IEEE
시범사업에서의 접근CS+PS domain : VCC (‘08년 개발완료)
PS domain : MIP + MIH (‘08-‘09년 개발완료)
시범서비스 & 표준화
‘10년도 시범서비스(VHO)상용망기반의 테스트베드 (시범가입자 수용)
시범가입자의 서비스에 대한 반응
선호도, 필요도 (선호 network If)
만족(시스템품질-안정,편의)
Policy 관련
상용화/정책 기반자료VHO 모니터링(사용/이동패턴, 성능)
PG 706 표준화 과제VHO architecture 정의
성능 requirement, 기능/성능 규격, 시험시나리오 등
Business & Tech Issue
VHO 의 business적인 이슈VHO 제공이 고객에게 appeal? 적극적 상품개발, 시장방어적
어떤 application으로 value added할 것인가?
VHO가 사용될 target multiple network은?
통합인증/과금기반의 상품접근
VHO 의 기술적인 이슈Single radio – MBB, Power consumption
통합인증/과금 (이종망간에 선인증 허용, 인증통합, 인증연동)
가입자정보, 망접속정보의 증가 (교차분석)
4G 표준화 – 기술 selection
WiFi, Femto – MIH IS 위치관리
Policy (Appliction aware, BW allocation function 구현 및 연동 등)
단말확보 – 상용화 ready
참고문헌
1) Analysis of SIP-based mobility management in 4G wireless
networks, Computer Communications‘04
2) SIP-based seamless-handoff(S-SIP) scheme for heterogeneous
mobile networks, IEEE WCNC‘07
3) MIH를 이용한 이기종 무선망간 Handover 기술연구, TTA Journal
4) Seamless Integration of Mobile WiMAX in 3GPP Networks, IEEE
Com. Mag. 2008
5) Integration of the IMS/PCC framework into the mobile WiMAX
network, IEEE Com. Mag. 2008
6) Improvements to seamless vertical handover between mobile
WiMAX and 3GPP UTRAN through the Evolved Packet Core, IEEE
Com. Mag. 2009
7) Network-based mobility management in the evolved 3GPP core
network, IEEE Com. Mag. 2009
참고문헌
8) IEEE P802.21 tutorial, DCN: 21-06-0706-00-0000
9) 방송통신망 중장기 발전계획, KCC, 2009
10) 광대역통합망기본계획 1, 2, 3, MIC & KCC 2004, 2006, 2007
11) Mobility using IEEE 802.21 in a heterogeneous IEEE
802.16/802.11-based, IMT-Advanced (4G) network, IEEE Com. Mag.
2008
12) Mobility testbed for 3GPP2-based multimedia domain networks
13) Mobility management architecture based on joint mobile IP and
SIP protocols
14) Mobility management for All-IP mobile networks: mobile IPv6 vs.
proxy mobile IPv6
15) Handoff latency analysis of mobile IPv6 protocol variations,
computer comm. 2007
참고문헌
16) Media-independent handover for seamless service provision in
heterogeneous networks, IEEE Com. Mag. ‘08
17) 유비넷컨소시엄 사업 보고서 ‘08, ‘09
18) 옥타브컨소시엄 사업 보고서 ‘08, ‘09
19) 광개토컨소시엄 사업 보고서 ‘08, ‗09