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3GPP WLAN interworking requirements

This document discusses key requirements for WLAN interworking in 3GPP networks, including authentication with USIM, network sharing and selection, traffic separation and enforcement, and charging needs. It also outlines solutions and conclusions for these critical aspects.

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3GPP WLAN interworking requirements

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  1. 3GPP WLAN interworking requirements Cheng Hong, Tan Pek Yew (Panasonic) WIEN 12th July 2004 Cheng Hong, Tan Pek Yew

  2. WLAN issues identified in 3GPP • USIM based access control (WLAN) • Network sharing (discovery/selection) • traffic enforcement • Charging Cheng Hong, Tan Pek Yew

  3. Authentication scheme • 3GPP requires (U)SIM based access control • Explicitly identified by SA1 in LS answer to SA2 (s1-040716) • The use has to be authenticated using 3GPP system (e.g. USIM) in order to access 3GPP PS services • Therefore, WLAN has to support: • EAP based authentication (11i) • UE has to contain USIM support (hardware, or software) Cheng Hong, Tan Pek Yew

  4. Network sharing and selection • Two issues involved in the network sharing arch in 3GPP: • Network information Discovery • Network selection • Network information discovery includes: • - WLAN capability discovery (e.g. WLAN is a IWLAN, Link capability of the WLAN, QoS status, etc.) • - Network behind the WLAN (e.g. what PLMN is connected, relationship with UE’s HPLMN) • So far two methods proposed • - SSID based for WLAN selection • - (Information to be included in the beacon/probe) • - EAP based • - A method developed in the EAP group (using EAP error message) • * More details in 3GPP TS24.234 from 3GPP CN1 group Cheng Hong, Tan Pek Yew

  5. Traffic separation & enforcement • Traffic separation & route enforcement • Especially important for a shared WLAN scenario • So far, VLAN is proposed in the 3GPP SA2 to provide the separation in TS23.234 • This requires: • AP to support VLAN tagging • VLAN tag to be delivered in the Authentication message Cheng Hong, Tan Pek Yew

  6. Charging requirements • WLAN Needs to support both for the interworking • Charging offline charged interworking subscribers • Charging online charged interworking subscribers • Details in TS23.234 sec 7.7 & 7.8 • For online charging • WLAN needs to support realtime monitoring • AP should collect real time usage information and carry out the update • Information has to be updated to the charging entity in WLAN (AAA entities) • Needs to be able to revoke user connection based on credit/quota updates Cheng Hong, Tan Pek Yew

  7. Conclusions • The items may impact the WLAN and needs to be studied in the WIEN: • Support of USIM based access control • Solutions for network discovery/selection • Traffic enforcement (VLAN) • Support of Charging (Online/offline) Cheng Hong, Tan Pek Yew

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