The problem Statement of Broadband Wireless Access Technologies Richard, Tom Taylor, Eva Chang, Tina Tsou

Overview Wired Access NASAAA Broadband Wireless Access technologies are widely deployed. WiFi/WiMAX 2G/3G/LTE When some wired carriers extend their network with wireless access technologies, they prefer to reuse NAS architecture. Chinese Carriers have deployed hundreds of thousands of WLAN APs. Special attention to QOS and service control is also required by Broadband Wireless Access Network. A tighter coordination between NAS and Wireless AN is necessary. Wireless Access

The Problem Statement Roaming  Need to track subscriber’s location changes  Need to avoid subscriber re- authentication to improve quality of experience by relaying roaming status to NAS.  Example: WiFi network NAS authentication method is Portal UE moves from one AN to another UE's IP address is usually changes UE has to be re-authenticated at the NAS although the second AN understands its roaming status.  If second AN reports roaming information to NAS, re-authentication can be avoided Subscriber’s roaming experience will be improved. Wireless AN NASAAA WTP Wireless AN WTP Roaming scenario

Wireless access protection (Such as WiFi WPA, WPA2) NAS will inevitably help to negotiate key materials used for air protection, and it should deliver the intermediate key material (called PMK in WiFi) to wireless AN. really a HOKEY problem, not ANCP Specific identification for wireless subscriber For DSL access technology, a PVC represents a subscriber. But for wireless access technology, many subscribers can access with the same radio. Hence many subscribers may use the same VLAN. So when the subscriber’s information is exchanged, subscriber-specific detailed information needs to be included. Radio Resource Control Radio spectrum is a precious and limited resource. Communication between the wireless AN and NAS makes it possible to allocate radio resources more efficiently between different wireless subscribers. For example, by policy, Wireless AN may kick off the inactive subscribers. The Problem Statement (cont)

Discussion of Candidate Solution Reuse the general framework and protocol of ANCP Extend and define wireless specific message types (for discussion) New wireless capabilities need to be defined for establishment of adjacency relationship New wireless subscriber identification needs to be defined New message type needs to be defined for identifying invalid or unauthenticated user to AN for better radio resource control New message type need to be defined for AN to update NAS with roaming user information for better roaming experience