WiMax - Control Plane Protocols and Procedures

1. Network Entry Discovery and Selection/Re-selection

    1.1 NAP Discovery: MS在检测到的channel上，通过解码和扫描ASN的DL-MAP，来检测NAPs. NAP_ID即Operator ID，用Base Station ID的高24bit来表示。

    1.2 NSP Discovery：一个NAP可以支持一个或多个NSP。The list of NSP IDs and verbose NSP names presented over the air interface as part of SII-ADV and/or SBC-RSP, and all NSP realms that can be obtained using SBC-REQ/RSP SHALL be uniform across all Base Stations of the same NAP ID

        MS顺序地对每个NAP执行NSP Discovery 操作；

    1.3 NSP Enumeration and Selection：WiMax支持手动和自动两种网络选择模式，在发现的NSP中做出选择

    1.4 ASN Attachment：选择好NSP之后，MS选择一个与该NSP相关连的ASN，使用NAI执行Attach过程。

2. WiMax密钥

    2.1 MS与Home NSP，通过EAP协议完成用户的身份验证功能。验证成功后，产生MSK和EMSK。
        2.1.1 MSK通过AAA协议传递到MS当前的NAS，用于生成密钥来保护R1(MS <-> BS)接口的数据传输。
        2.1.2 EMSK保存在MS和EAP验证服务器中，用于生成MIP-RK来保护Mobile IP的信令数据。


3. AAA

     3.1 For device authentication based on X.509 certificates, MS SHALL support EAP-TLS, Username of the NAI presented in EAP-Response/Identity SHALL be the MAC Address of the device.

    3.2 For user authentication, MS SHALL support at least one of EAP-AKA [18] or EAP-TTLS [19]. When EAP-TTLS is used, the MS and AAA SHALL support TTLS version 0 [19] and MS-CHAPv2 [20] as a tunneled authentication protocol.

    3.3 NAI.
      3.3.1 Outer-Identity, In EAP the outer identity refers to the NAI delivered by the EAP-Peer in the EAP-Identity Response. The RADIUS User-Name attribute is set to this value in the Access-Request. The AAA infrastructure routes the AAA packets according to the information contained in this attribute.