ZXWN WiMAX Core Network Introsuction

V09.01

Relationship Organizations

1. IEEE

2. WiMAX Forum

3. NWG

4. 3GPP/3GPP2

NWG System Architecture

WiMAX system is divided into three layers, according to the definition of the WiMAX system’s NWG:

ASN（ Access Service Network) is the network accessing provider, that include visit ASN and home ASN, when support roaming,

CSN（ Connectivity Service Network） is the NSP’s network, that include visit CSN and home CSN, when support roaming. The network element takes hand in the function of visiting and home respectively, and the function such as v-AAA/h-AAA, FA/HA, v-PDF/h-PDF and so on.

ASP（ Application network） is the application service providers’ (such as ISP、 ICP) network, providing application services or content services, usually Internet, and also corporate or other network.

Core Network Interface description for NWG Architecture(1)

NWG architecture defines 8 interface on total: R1: The interface between the MMS and ASN, following the definition

of 802.16 air interface (physical layer and MAC layer). R2: The interface between the MMS and CSN, including authenticatio

n, authorization and IP address allocation and other functions. R3: The bearing surface and control surface interface between ASN a

nd CSN. The bearing interface is the IP tunnel between ASN and CSN, and the control interface include the establishment of IP tunnel, releasing control, IP address assignment, TCP/IP protocol stack, and AAA, QoS strategy and implement between ASN and CSN.

R4: The control surface and bearing surface interface between ASN and ASN for inter-ASN GW mobility.

R5: The control surface and bearing surface interface between V-CSN of V-NSP management and H-CSN of H-NSP. The bearing interface including IP tunnel establishment, releasing control and AAA and QoS strategy , implement and other protocol between V-CSN and H-CSN.

Core Network Interface description for NWG Architecture(2)

Also, there are some criteria interfaces within the ASN, as follow: R6 interface: is the interface from BS/BSC to AGW in ASN, and it is the mo

st important interface. It include control surface and bearing surface. The bearing surface include the tunnel between BS and AGW; the control surface include IP tunnel establishment, releasing control, paging in broadcast and protocol of AAA, DHCP, DNS, MIP, etc. (some protocol such as DHCP is not clearly defined to take the user plane or control plane. So it is regulated that if the end application support the protocol then take user plane, else take the control plane like Radius protocol)

R8 interface: is the control and bearing interface between two BS/BCS for ensuring to fast and seamlessly switch. Bearing interface include the protocol that transferring data between BS when MCS cutoff between two BS; control interface include communication protocol between the BS, and control signal protocol of data transferring when MS cutoff. Generally it can be replace by R6 and R4 interface of AGW.

R7 interface: is the interface between DP and EP module of ASN GW interior for control information of transmission AAA and related to strategy of QoS, and the intention is similar to control and exchange’s separation model of NGN. If AGW entities did not separate, R7 interface don’t use generally.

WiMAX Core network Architecture of our corp.

WiMAX adoption the hierarchical module of next generation netwo

rk NGN. The whole network is divided into five layers: service laye

r, control layer, the core transport layer, edge accessing layer and

the terminal layer.

AGW Hardware Architecture

AGW ‘s hardware is based on the unified hardware platform of

corporation. You can make up of a office by a shelf. The sub-

rack has both front and rear boards, and the signal rack’s

typical configuration is shown below:

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Key Indicators of AGW

Technical Characteristic

s

Parameter Name Specific indicato

rs

Capacity indicators

Maximum number of users 1million

Maximum number of active users 1million

Maximum number of PDP Context Activatio

n2million

Throughput of data 2Gbps

IP switching capacity 40Gbps

 Interface indicatorsSTM-1 ATM interface 48

FE interface 24

GE interface 12

E1/T1interface 128

Main function of AGW 1. user authority authentication (do not support the device authentication) manner： AAA 2. IP address assignment Static IP address, private IP address + NAT, IP Pool， DHCP client/relay， AAA di

stribution. Support IP accessing. 3． Route transmit Support default routing, static routing, RIP/OSPF/BFP; support MPLS, IPSec、 ACL

and load balancing; support QoS management functions, flow shaping. 4． R6 interface realize R6 signaling plane and user plane processing, GRE tunnel management, session m

anagement, L2 mobility management. 5. statistics and billing Support flow statistics by user, address etc., support billing by time, flow rate and typ

e of service. 6. Unified network management Support service management, data configuration function, SNMP,MIB. 7． R3 interface Support RADIIUS client function, DHCP client function, DHCP Relay, Telnet server f

unction.

AAA introduction

AAA is the Authentication， Accounting， Authorization Serv

er, also know as RADIUS server. It authentication information

of user script file authentication, complete the data server auth

orization, realize billing function. AAA server is divided service

s AAA, intermediate AAA (agent AAA) and the home of AAA,

when the MSC need to cutoff of roaming.

AAA Architecture AAA products currently include Radius server module, Radius background

configuration module, bill processing module, network management sub-system etc. modules. Database system adopt SQL Server2000 of MS. In addition there is a dog process on the Radius server, which the responsibility is monitoring function of Radius service and bill process service. It use the UDP unified among the modules. Network management interface adopt SNMP (simple network management protocol).

AAA Function

Device/ user authentication and authorization when MSS access to network;

Service authentication and authorization when the MSS service request;

Billing; Support PKMV1/V2 authentication mechanism, su

pport EAP-TLS、 EAP-MSCHAPV2 etc. many authentication’s methods;

Distinguish between V-AAA and H-AAA, and an option needed B-AAA;

Save the users’ QoS profile information, provide users’ QoS profile information for user authentication, and admission control.

The relationship between WiMax and other networks

1. Broadband Metropolitan Area Network2. 3GPP network3. 3GPP2 network 4. IMS network