Tuesday, August 17, 2010

WiMAX -- 网络结构和参考点


1.  功能体和参考点



几个重要的概念:
    1.1 Access Service Network (ASN):defined as a complete set of network functions needed to provide radio access to a WiMAX subscriber(为WiMAX用户提供无线接入服务的一个功能体)

    1.2 Network Access Provider (NAP):NAP is a business entity that provides WiMAX radio access infrastructure to one or more WiMAX Network Service Providers (NSPs). A NAP implements this infrastructure using one or more ASNs(为WiMAX运营商提供无线接入服务的基础设施,由一个或多个ASN组成。是一个商业上的概念)

   1.3 Connectivity Service Network (CSN):Connectivity Service Network (CSN) is defined as a set of network functions that provide IP connectivity services to the WiMAX subscriber(s).(为WiMAX用户提供IP联接服务的功能体)

   1.4 Network Service Provider (NSP): NSP is a business entity that provides IP connectivity and WiMAX services to WiMAX subscribers compliant with the Service Level Agreement it establishes with WiMAX subscribers. (为注册用户提供IP联接和其他WiMAX服务,是一个商业上的概念)



2. 组网方式。WiMAX可以采用灵活的组网方式,一个BS可以同时接入多个ASN-GW;一个ASN可以同时接入多个CSN,并且,这些CSN可以属于不同的Service provider.



3. 传输层的协议结构,分为控制面(CP)和数据(UP)面两种。控制面的消息直接在MAC(R1)或IP(R3/R6)上传递;用户面的消息在R3/R6上通过IP隧道传递。
 
 

4. 主要协议

4.1 IP地址分配: DHCP
4.2 AAA: RADIUS + EAP
4.3 移动性管理: MIPv4(Client MIP, ProxyMIP), IPv6

参考文献:
[1] WMF-T32-002-R010v04_Network-Stage2-Part1
[2] WMF-T32-003-R010v04_Network-Stage2-Part2

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