September 2004 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

September 2004 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

September 2004 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

Network extended L 2.5 model September 2004 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

Network extended L 2.5 model September 2004 Network extended L 2.5 model 802.11 coverage areas will be the center points for interaccess mobility management procedures Eric Njedjou, France Telecom

Network extended L 2.5 model September 2004 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

Exchanging L 2.5 information via LLC September 2004 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

Exchanging layer 2.5 signalling before LLC connection is up September 2004 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

Extending MAC Management frames September 2004 Extending MAC Management frames Description of sub-types Association request Association response Reassociation request Reassociation response Probe request Probe response Beacon Anouncement traffic indication message Disassociation Authentication Eric Njedjou, France Telecom

Availabality of Other Access Networks frame (AOAN) September 2004 Availabality of Other Access Networks frame (AOAN) As a sub-type of the management frame Using information received from L 2.5 Frame Control Duration DA SA BSSID Sequence Control New Frame body FCS Fig 4. Management frame extension for AOAN Protocol version Type= Management New Sub-type Eric Njedjou, France Telecom

Frame Body field of the AOAN when access technology is GPRS/UMTS September 2004 Frame Body field of the AOAN when access technology is GPRS/UMTS RLC MAC GSM RF/L1 GPRS/UMTS PHY GMM/SM LLC/RRC 802.11 Layer 2.5 Fig5. Use of L 2.5 to extend MAC Management Order Information 1 Access technology identity 2 GPRS Mobility Management state 3 PDP type 4 PDP state 5 QoS profile requested 6 QoS profile negotiated 7 PLMN Fig4. AOAN Frame body subfield Eric Njedjou, France Telecom

Alternative to defining a new frame for AOAN September 2004 Alternative to defining a new frame for AOAN Order Information 1 Capability information 2 Listen interval 3 SSID 4 Supported rates 5 Access technology type=GPRS/UMTS 6 GPRS Mobility Management state 7 PDP type 8 PDP state 9 QoS profile requested 10 QoS profile negotiated 11 PLMN Transport the Availability of Other Access Networks information with the association request frame Fig6. Suggested new Association Request frame body Eric Njedjou, France Telecom

association response status code September 2004 Status code Meaning Sucessful 2-9 Reserved 10 Cannot support all requested capabilities in the capability information field 12 Association denied due to reason out of scope of this standard 13-16 Association denied because of authentication failure 17 Association denied because access point is unable to handle additional associated stations 18 Association denied due to requesting station not supporting all the data rates 19 20 Association denied because requesting station is already attached to another access network that provide better link characteristics than the access point can serve 21 Association denied because the requesting station is already attached to another access network and the services it is running/willin to run does not require better link QoS 22 - 65535 Order information 1 Capability information 2 Status code 3 Association ID (AID) 4 Supported rates Fig7. Association Request Frame body Eric Njedjou, France Telecom

Suggested new association procedures September 2004 Suggested new association procedures RLC MAC GSM RF/L1 GPRS/UMTS PHY GMM/SM LLC/RRC 802.11 Layer 2.5 802.11 Access Point AOAN Association Request Association Response Multi access station Eric Njedjou, France Telecom