Steps in L2 and L3 Handoffs - PowerPoint PPT Presentation

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Steps in L2 and L3 Handoffs

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... way Handshake IETF-pana IETF-seamoby IETF-dna Standards related work Key Steps in Handoff Key Activities Handoff Initiation Network Activation Triggers L2 ... – PowerPoint PPT presentation

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Title: Steps in L2 and L3 Handoffs


1
Steps in L2 and L3 Handoffs
  • Vivek G Gupta
  • Intel Corp.
  • vivek.g.gupta_at_intel.com
  • Jan 2004

2
Background..
802.X
802.X
802.Y
zG (WWAN)
  • Intra 802 Handoffs (802.x ? 802.x)
  • Covered by respective 802 working groups
  • These 802 WGs will also deliver fast intra 802
    handoff solutions that address 30 msec or less
    handoff latency
  • Through proactive pre-authentication, soft
    handoffs, and/or fast reconnections between nodes
    (FR FH SG, TGi, etc. for 802.11)
  • Inter 802 Handoffs (802.x ?802.y) and extension
    to more general case of inter network handoff
    (802 ?zG)
  • Within scope of 802.21
  • All further discussion in this presentation
    applies only to this category

3
Application Perspective
  • Voice
  • Acceptable Latency 50 ms
  • Key issue in handoffs across administrative
    domains and heterogeneous networks
  • Make before Break almost Required
  • May be difficult to get this to work reliably
  • Person moves out of office/home (Transition from
    802.11 to 802.16/WWAN)
  • Real time Multimedia Streaming
  • Acceptable Latency up to 150 ms
  • Make before break strongly preferred
  • VPN Sessions (in scope of this WG?)
  • Latency is not such a key issue
  • Make before break preferred
  • But may be difficult to achieve. Corporate
    policies may not allow split tunnels
  • Other (Non real time and latency insensitive)
    apps
  • Make before break NOT required
  • Email, browsing, etc.

4
Steps in 802 based L2 Handoffs
Network Discovery Selection
Authentication
Association
Key Steps in Handoff
Handoff Initiation
With/without IAPP Context Transfer across Access
nodes. Fast Handoff, 2/4 - way Handshake
802.1x (Full)
Network Activation Triggers L2 triggers,
Connection Policies, Power
Mgmt
Active scan (Probe/Response) Passive scan
(Cached/Wait for beacon)
Key Activities
IETF-seamoby IETF-dna
Standards related work
IETF-pana
5
Steps in L3 Handoffs
Layer 2 Connectivity
Key Steps in Handoff
Packet Reception
IP Connectivity
Address acquisiti- on DHCP
Network Selection
Service Discovery Provisi oning CUPE
Handoff Initiation Network Activation Triggers
Duplicate Address Detection
Authen -tication Associa- -tion 802.1x
based
Key Activities
Binding Update
Context Transfer QoS Header Compr----ession
Most of 802.21 focus
-Seamoby CARD - dna
mipv4 mipv6 mipshop
Standards related work
Several IETF drafts
Seamoby Context Transfer
-pana
6
Conclusion
  • Identify Usage Models for handoffs across
    different networks and comprehend L2 requirements
  • Study requirements for vertical handoffs in
    liaison with IETF, 3GPP and 3GPP2
  • Define a set of abstract handoff properties /
    variables and mapping to each 802 protocol
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