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IEEE 802.11 Wireless Interworking with External Networks (WIEN) Study Group Closing Report

IEEE 802.11 Wireless Interworking with External Networks (WIEN) Study Group Closing Report. 1 4 May 2004 Stephen McCann, Siemens Roke Manor stephen.mccann@roke.co.uk. Extending 802.11 MAC Management operation for external networks information advertisement to the AP using L 2.5.

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IEEE 802.11 Wireless Interworking with External Networks (WIEN) Study Group Closing Report

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  1. IEEE 802.11 Wireless Interworking with External Networks (WIEN) Study GroupClosing Report 14 May 2004 Stephen McCann, Siemens Roke Manor stephen.mccann@roke.co.uk Eric Njedjou, France Telecom

  2. Extending 802.11 MAC Management operation for external networks information advertisement to the AP using L 2.5 eric.njedjou@francetelecom.com Eric Njedjou, France Telecom

  3. Handover control • L3MPs as Mobile IP provides fully "terminal oriented" mobility solution • Always possible to proprietarily change MIP to initiate terminal mobility by the Home Agent or an extension thereof in the network • Network controlled mobility in multi-acess environment could be desirable for multiple reasons • Intelligent management of overall radio resources for the integrated operator • Always ensure the best possible quality of data services across heterogeneous accesses Eric Njedjou, France Telecom

  4. Handover control • Therefore modifications to Mobile IP to support network initiated heterogeneous handovers would be based on information available from the operation of the involved access technologies • Then sounds more appropriate to directly modify the access technologies for inter-access mobility • Rather than adding a level of complexity by embedding access technologies signalling into an L3MP • The layer 2.5 model is emerging to facilitate inter-access mobility and handovers operation Eric Njedjou, France Telecom

  5. Network extended L 2.5 model • Partly needed as a consequence of the need to control mobility form the network side • Layer 2.5 should necessitates shorter modifications to access technologies protocols stacks at network side • The peer to peer protocol operation need not change • except that the layer 2.5 will have to be appended to existing stacks in SGSNs/APs in order to deal with attachment/mobility management in the presence of multiple access networks Eric Njedjou, France Telecom

  6. Network extended L 2.5 model 802.11 coverage areas will be the center points for interaccess mobility management procedures Eric Njedjou, France Telecom

  7. Network extended L 2.5 model The Information Service would also store information (received via L2.5) from attachments of stations to external networks as GPRS/UMTS Eric Njedjou, France Telecom

  8. Exchanging L 2.5 information via LLC • An associated station communicates via the exchanges of MAC frames carried by LLC • New treatment at network side will consist in analyzing L 2.5 information received on top of LLC on another layer • In the case LLC is envisaged to carry layer 2.5 information, a new type of operation would have to be required Eric Njedjou, France Telecom

  9. Exchanging layer 2.5 signalling before LLC connection is up • When a station is not associated, thereby having no link layer connection, it can not exchange L 2.5 signalling with the AP/network • The information on the station attachment to other access networks (obtainable via L 2.5) can not be available to the AP/network • Suggestion:extend MAC Management operation so as to report information on the attachment to other access networks upon requesting association Eric Njedjou, France Telecom

  10. Extending MAC Management frames Eric Njedjou, France Telecom

  11. Frame Control Duration DA SA BSSID Sequence Control New Frame body FCS Protocol version Type= Management • New Sub-type Fig 4. Management frame extension for AOAN Availabality of Other Access Networks frame (AOAN) • As a sub-type of the management frame • Using information received from L 2.5 Eric Njedjou, France Telecom

  12. Layer 2.5 RLC MAC MAC GSM RF/L1 PHY GPRS/UMTS 802.11 Fig5. Use of L 2.5 to extend MAC Management GMM/SM LLC/RRC Frame Body field of the AOAN when access technology is GPRS/UMTS Fig4. AOAN Frame body subfield Eric Njedjou, France Telecom

  13. Alternative to defining a new frame for AOAN • Transport the Availability of Other Access Networks information with the association request frame Fig6. Suggested new Association Request frame body Eric Njedjou, France Telecom

  14. association response status code Fig7. Association Request Frame body Eric Njedjou, France Telecom

  15. Layer 2.5 MAC AOAN MAC RLC Association Request MAC Association Response 802.11 PHY GSM RF/L1 PHY GPRS/UMTS 802.11 Multi access station 802.11 Access Point GMM/SM LLC/RRC Suggested new association procedures Eric Njedjou, France Telecom

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