Mobile VPN over WLAN a Teleservice of the UMTS

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Mobile VPN over WLAN a Teleservice of the UMTS

• C. F. Grecas, I. S. Venieris

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VPNs Structure
The public nature of the facilities connecting
the sectors of the VPN is not perceived by the
users
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The Mobile VPN architecture employing the UMTSs
core network
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The WLANs basic architecture

• DS Distribution System (Ethernet)
• AP Performs the wireless-to-wired bridging
  function
• BSA Basic Service Area covered by a single AR
• ESS Linkage of two or more BSAs belonging to
  the same DS

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The UMTS structure
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The protocol stack modification of the SGSN

• For the requirements of the Mobile VPN the SGSN
  degenerates into a typical layer 3 router

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The protocol stack modification of the GGSN

• Similar horizontal extension are made to
• the GGSN protocol stack

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The VPN's subnets connected to the UMTS Core
Network.
Every WLAN section constitutes an ESS All the MSs
are registered as members of every ESS
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The Location Update mechanism (IP layer)

• Host-specific routes
• ICMP packets

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Traffic Handling within the MPVN
Within the same ESS (WLAN resources/techniques) Be
tween different ESSs (Section Router, PLMN
platform ) To and from the public Internet
(Section Router)
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Cohabitation with the conventional UMTS services

• The coexistence with the rest of the UMTS
  services is to be assured by the cell granularity
  of the UMTS cells
• The system specifications foresee even the
  employment of pico-cells in the areas of heavy
  traffic
• A trade off should be adopted between the UMTS
  and WLAN Mobile Station following the QoS
  guaranteed