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Interworking – QoS and Authorization

Interworking – QoS and Authorization. Tan Pek Yew & Cheng Hong Panasonic (WNG-SC) Date : 13 March 2003. WLAN with 3G. WLAN-3G one instance of WLAN to WMAN 3GPP effort’s in WLAN-3G WLAN is a black box WLAN IEEE802.11 QoS in .11e Security in .11i. AI. W2. W3. Generic Architecture.

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Interworking – QoS and Authorization

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  1. Interworking – QoS and Authorization Tan Pek Yew & Cheng Hong Panasonic (WNG-SC) Date : 13 March 2003 Tan Pek-Yew, Panasonic

  2. WLAN with 3G • WLAN-3G one instance of WLAN to WMAN • 3GPP effort’s in WLAN-3G • WLAN is a black box • WLAN IEEE802.11 • QoS in .11e • Security in .11i Tan Pek-Yew, Panasonic

  3. AI W2 W3 Generic Architecture Air Interface W3 W2 Mobile WLAN Interworking Interworking Terminal Functions Functions Network L x Interfaces E x Interfaces User Data MT Forwarding Function Application User Credential Storage WLAN M s WLAN Functions Authenticator L p E p Authorisation Authoriser Function E pa Standard Network Protocols Standard Network Protocols L a E a Resource Accounting Monitor Function WLAN Technology L s WLAN Technology E s Authentication Attendant Function Resource Control User Data Flow Interface Tan Pek-Yew, Panasonic

  4. Intranet / Internet 3GPP WLAN interworking architecture (with Policy Control) 3GPP Visited NW 3GPP AAA proxy C Gw CCF Wf Wr/Wb Packet data gateway PDF (I/F TBD) WLAN Access Network (with or without an intermediate network Border gateway (Opt) WLAN UE Wn Go TBD Wn - Tunnelled data through intermediate networks (Missing in WLAN architecture) Wr - Wireless LAN authentication (i/f to 3GPP) (As Es, Ep in WLAN architecture) Wb - Wireless LAN charging (i/f to 3GPP) (As the Ea in WLAN architecture) Go – 3GPP SBLP control interface (A TBD interface extends it to the WLAN) (I/f to 3GPP) Wi Packet data network Wr/ Wb Wn PDF (I/F TBD) 3GPP AAA Server Wx HSS D’/Gr’ HLR Go Wo Wf C Gw CCF Packet data gateway OCS Wi Packet data network 3GPP Home Network PDF : Policy Decision Function Tan Pek-Yew, Panasonic

  5. Authentication & Authorization • Security control from 3GPP Point of view: • An end-to-end EAP session (AKA/SIM) is able to mutually authenticate the UE and AAA server in 3G network. • Port control at the WLAN would be open based on AAA SUCCESS. Keys generated by EAP method would be distributed together with this AAA SUCCESS (e.g. 802.11i PMK) • EAP methods would put requirements on WLAN UE. • EAP could also be used for Service or access authorization • If other authorization or authentication methods are introduced, would it be supported by current WLAN standards? • Transport layer interface between WLAN Authenticator and 3G AAA • 3GPP WLAN interworking assumes Diameter (with conversion to Radius) as AAA protocol • Radius is frequently used as an example in IEEE 802.11i and 802.1X texts • Where should the conversion be performed? (WLAN or 3GPP) Tan Pek-Yew, Panasonic

  6. QoS Services • Requirement for Seamless Information Delivery • Providing end-to-end QoS services • Entities to achieve may include • WLAN Access Policy Control (Policy Control Functions) • WLAN access Policy Enforcement (Policy Enforcement Functions) • Enabling QoS services to be extended to wireless data streams external to WLAN Tan Pek-Yew, Panasonic

  7. QoS in WLAN. How? • 3GPP access control also includes services authorization that require QoS for delivery of data streams • Should WLAN be able to control resources (e.g. grant QoS, permit tunnels) for the service? • WLAN QoS has 2 access mechanism : • Polled Based OR • Contention Based • How can QoS be specified in IEEE802.11 Networks (esp .11e) ? • Implementer Point of view • QoS Services required from WLAN Tan Pek-Yew, Panasonic

  8. Simulation Set-ups • PHY operating at 36 Mbps • Based on .11e MAC • 3 STAs each transmitting 6 Mbps – Polled based • 10 STAs each transmitting 600 Kbps – Contention Based • Packet Error Rate at 10 % • Both Polled and Contention Based station in Contention Period Tan Pek-Yew, Panasonic

  9. Simulation Results (Throughput) 3 Stations each Delivering 6 Mbps Streams (Polled Based) 10 Stations each 600 Kbps Streams (Contention Based) Traffic of 6 Mbps Stations using Polled Based Expected Average Data Rate Average of 10 Stations Traffic using Contention Based : 5.2 Mbps Selection of different types of HCF (Polled/Contention Based) yield different QoS performance Tan Pek-Yew, Panasonic

  10. Conclusions • WLAN to Interwork with other Networks require basic interfaces to address • Authentication and Authorization • Network Resource allocations • Deterministic performance criteria • Consistent Diameter-Radius Conversion • Services/Applications require expected WLAN QoS Performance • Consistent QoS for at all APs for the same Service/Application Tan Pek-Yew, Panasonic

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