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3G < -- > WLAN handover

3G < -- > WLAN handover. Gabor Bajko Nokia. Experiment. Internet. V4. V6. Upstream-router. DSMIP6 Home Agent. V6. V4. DSMIP6-HA. 802.3. WiFi. HSPA. Experiment. Internet. V4. V6. Upstream-router. DSMIP6 Home Agent. V6. V4. DSMIP6-HA. 802.3. WiFi. HSPA. Experiment details.

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3G < -- > WLAN handover

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  1. 3G < -- > WLAN handover Gabor Bajko Nokia

  2. Experiment Internet V4 V6 Upstream-router DSMIP6 Home Agent V6 V4 DSMIP6-HA 802.3 WiFi HSPA

  3. Experiment Internet V4 V6 Upstream-router DSMIP6 Home Agent V6 V4 DSMIP6-HA 802.3 WiFi HSPA

  4. Experiment details • Device ifaces: • Device with only one iface active at a time • Device with both ifaces active until the second is IP configured • In case 1 an interactive session (skype video) not always survives when switching from 3G to WLAN • In case 2, the session mostly survives • If switching from wlan to wlan, this mode N/A (wifi chipset does not connect to 2 networks simultaneously)

  5. Source of problems • Getting WLAN iface operational takes a long time • Most of the time is spent with IP configuration • Depends on whether the network is a home, public or enterprise

  6. Measurements -1

  7. Measurements -2-

  8. Possible remedy • IP configure the client during the L2 association • Similar thing happens in 3G/4G today, ie IP address configuration is done during the link layer setup (proven to work, everyone is using it) • But be backward compatible

  9. Potential solution • AP indicates in the beacon if is capable of providing IP config during association • Assocreq to indicate if the client is capable of receiving IP config in assocresp • Assocresp to contain IP config data • IPv4/v6 address, lease time, netmask/prefix, default-gw address, DNS address, DHCP server address, RA options (v6) • AP or AC to ask the DHCP server (if not co-located) for a pool of IP addresses in advance, and allocate from that pool to the client during assoc • Advanced DHCP config can still be done by the client placing a dhcpreq

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