19427661 wi max-network-architecture
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Transcript of 19427661 wi max-network-architecture
WiMax SolutionsDivision
WiMAX Network Architecture
Kuo-Hui Li, PhDWiMAX Solutions Division
Intel Mobility GroupJune 05, 2006
Slide2 WiMax Solutions Division
Internet
Radio AccessControl/Mngmt.
WiMAXAccess Network
Radio AccessData Plane
NSPCore PSTN
ASP
Network AccessProvider (NAP)
Network ServiceProvider (NSP)
M:N NAP – NSP relationship enablingwholesale/unbundled
access
Generic Mobile WiMAX Architectural Model
ASP – Application Service Provider
Flexible Network Operator Relationships• Supports infrastructure access unbundling
from IP connectivity services • Supports Multiple Virtual Network Operator concept
Slide3 WiMax Solutions Division
Key Architecture Features• All IP radio access and core transport network
Based on IEEE* 802.16/e and IETF protocols• Support for all usage models (fixed to fully
mobile)• Access to incumbent core networks via
interworking functions• Open interfaces both within the RAN, and
between the RAN and the core network• Support for voice, data and multimedia services
with appropriate QoS
Slide4 WiMax Solutions Division
Network Reference Model (NRM)
BS
BSMobile
SubscriberStation
ASN
ASNGW(FA)R6 CSN
NSP
R1R3
Another ASN
R4
R2
AnotherOperator’s
CSN
R5
Roaming
R6HA AAA
NAP
ASN – Access Services Network NAP – Network Access ProviderCSN – Core Services Network NSP – Network Service ProviderBS – Base Station HA – Home AgentFA – Foreign Agent AAA – Authentication, Authorization, & Accounting
Slide5 WiMax Solutions Division
Key Network Features• AAA with CSN for homers and roamers
IEEE 802.16 security framework extended to cover mobility scenariosRADIUS for AAA, evolving to DIAMETER
• QoSBased on subscriptionPolicy enforcement
• Mobility managementMobility management is tiered
Intra-ASNInter-ASNInter-CSN when V-CSN supports the HA for mobile IP
• Wimax/3G Interworking• Charging
Common Billing with CSN but different CDR (Call Detail Record) collectorsCommon Billing with common CDR collector
• ProtocolsSupport for both IPv4 and IPv6
Slide6 WiMax Solutions Division
Network Nodes
BS
Internet
Short Distance
(e.g., Coax, Fiber transport of RF is under consideration)
Backhaul(L2/L3 Tunnel)
ASN-GW/FA
Network internal(e.g., L2/L3 Tunnel)
ASN Core
Physically connected to antenna
At the Local Switching
Center
WiMAX Air Interface
MSS
Home Agent (HA)
AAA
Slide7 WiMax Solutions Division
ASN Profiles• Multiple ASN Profiles have been specified in WiMAX as a tool to
manage diversity in ASN node usage and implementationVendors (esp. BS) very concerned that they will be forced to implement every protocol option in the specificationWe cannot preclude any topological variant from serving any usage or deployment/Interworking scenario
• Release 1 of NWG Specifications on WiMAX supports 3 ASN Profiles:
Profile A: Centralized ASN Model with BS and ASN GW in separate platforms through R6 interfaceSplit RRM: RRA in BS and RRC in ASN-GWOpen interfaces for Profile A: R1, R6, R4, and R3
Profile B: Distributed ASN solution with the BS and ASN GW functionalities implemented in a single platform Open interfaces Profile B: R4 and R3
Profile C: Similar to Profile A, except for RRM being non-split and located in BS.
Slide8 WiMax Solutions Division
ASN Profile A
NSP
Air Interface
MS
BS
BS
R1
R4
R2
R3
ASNProfile A
R4
R3
Internet
R6
ASN GW (FA)
ASP
R6
ASN GW (FA)
BS ASN-GW
•HO•Data Path 1 & 2•Authentication Relay•Paging Agent•Key Receiver•Context•RRA•SF Management
•HO•Data Path 1 & 2•Authenticator•Key Distributor•Context•RRC•SF Authorization
•DHCP Proxy/Relay•MIP FA•Location Register•PMIP Client•AAA Client•Paging Controller
Separate BS and ASN-GW, Split RRM
Slide9 WiMax Solutions Division
ASN Profile B
Air Interface
MS
BS+ASN GW (FA)
BS+ASN GW (FA)
R1
R4
R2
ASN Profile B
BS + ASN-GW•HO•Data Path 1 & 2•Authenticator•Key Receiver + Distrib.•Context•SFA + SFM
•RRA + RRC•DHCP Proxy/Relay•MIP FA•Location Register•PMIP Client/Assistant•AAA Client
R4
R3
NSPR3
Internet
Combined BS, ASN-GW
Slide10 WiMax Solutions Division
ASN Profile C
NSP
Air Interface
MS
BS
BS
R1
R4
R2
R3
ASNProfile C
R4
R3
Internet
R6
ASN GW (FA)
ASP
R6
ASN GW (FA)
BS ASN-GW
•HO•Data Path 1 & 2•Authentication Relay•Paging Agent•Key Receiver•Context•RRA + RRC•SF Management
•HO•Data Path 1 & 2•Authenticator•Key Distributor•Context•SF Authorization
•DHCP Proxy/Relay•MIP FA•Location Register•PMIP Client•AAA Client•Paging Controller
Separate BS and ASN-GW, RRM in BS
Slide11 WiMax Solutions Division
ASN Profiles Comparisons
•Distributed platform•Separate BS and ASN-GW•RRM at BS
•Distributed platform•Combined BS and ASN-GW
•Centralized platform•Separate BS and ASN-GW•Split RRM: RRA at BS and RRC at ASN-GW
Descriptions
•Extra backhauls for RRM messages
•Able to provide simplified pico-cell•Able to get BS and ASN-GW from different vendors
Profile C
•Difficult to customize IP and wireless functions for operators•Expensive for large-scale deployment
•Simple architecture•Suitable for small-scale deployment
Profile B
•Difficult Interoperability between BS and ASN-GW from different vendors•Heavy workload at ASN-GW•Fewer vendors
•Able to provide simplified pico-cell•Able to provide soft handover•Fewer backhauls for RRM messages
Profile A
ConProASN Profile
Slide12 WiMax Solutions Division
AAA and Roaming Framework
• Non-Roaming Case
MS AAA Client
AAA Proxy
R1
BS
ASN-GWASN
R6
H-CSN
R3AAA Server
MS AAA Client
AAA Proxy
R1
BS
ASN-GWASN
R6
V-CSN
R3AAA Proxy/Server
H-CSN
AAA Proxy/ServerR5
• Roaming Case
Slide13 WiMax Solutions Division
QoS Framework•End-to-End QoS model
SS
Admission Control
BS
LPFLocal Policy Data
ASN
PFSubscriber
Data
Home NSP
Via R3 & R5
R1
LocalResource Info
ASN-GW
AF
Triggers QoS Requests
AF: Application Function(e.g., SIP Proxy)
PF: Policy Function
LPF: Local Policy Function
Slide14 WiMax Solutions Division
Mobility Framework
• Mobile IP basedProxy mobile IP
Client unaware of MIPStandard RFC methods implemented in network only
Client mobile IPAs per standard RFC
CoexistenceSupport for both MIP-aware and other clients
Slide15 WiMax Solutions Division
WiMAX-3G Interworking• Initial Interworking scenarios
Scenario 1 - Common Billing and Customer CareScenario 2 - 3GPP system based Access Control and ChargingScenario 3: Access to 3GPP system PS based servicesOther scenarios such Service continuity & Seamless services are in the future
• Loose couplingSingle subscription Roaming between WiMAX and 3G networks
• Requires WiMAX CSN IWU NodeProvides IP Connectivity between ASN & 3GPP CSN.Direct Internet connectivity to MSLocal IP address management (DHCP, DNS).NAT functionAAA proxy or pass-through for Wa interfaceBridges R3 interface with Wa and Wn interfaces of the CSN