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Layer 2.5 Functionality. Peretz Feder Ajay Rajkumar Lucent Technologies May 13, 2004. Objectives. To crystallize the concept and boundary of layer 2.5 To describe the scope of the triggers with relation to Layers 3 and 2.5 Define interfaces to mobility management at layer 3

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layer 2 5 functionality

Layer 2.5 Functionality

Peretz Feder

Ajay Rajkumar

Lucent Technologies

May 13, 2004

21-04-00xx-00-0021-Layer2.5functionality

slide2

Objectives

  • To crystallize the concept and boundary of layer 2.5
  • To describe the scope of the triggers with relation to Layers 3 and 2.5
  • Define interfaces to mobility management at layer 3
  • Identify the decision entity and its relation to the executive entity

21-04-00xx-00-0021-Layer2.5functionality

ietf based layer 3
IETF based Layer 3
  • Mobility mechanism is Mobile IP Handover capable
  • Layer 3 mobility is not optimized for real time applications
  • Objective is to improve or assist layer 3 handover performance
  • Do we have the mandate to change it in 802.21?
  • Lets explore layer 3-

21-04-00xx-00-0021-Layer2.5functionality

layer 2 5 boundary definition
Layer 2.5 Boundary Definition

Mobile Node

Network

21-04-00xx-00-0021-Layer2.5functionality

mobility model
Mobility Model
  • Multi radio interface at the MT
  • Network may not control (or own) all the interfaces available to the MT
  • Propose to include a layer 2.5 entity at the MT that selects one of the available interfaces. However, the selection mechanism is vendor specific!!
  • Network has peer-to-peer relation with the state machine entity
  • Network assisted through handover recommendation
  • Network assisted through SLA directory update
  • Upon decision, L2.5 invokes the layer 3 (IP) handover mechanism providing it a single access choice

21-04-00xx-00-0021-Layer2.5functionality

layer 2 5 selection entity
Layer 2.5 Selection Entity
  • Selects a preferred access and let layer 3 execute without delay
  • How? Process all the triggers and apply a vendor specific algorithm
  • Triggers include locally measured attributes, loading conditions, available QoS, normalized signal quality
  • Hints include cost of link, roaming agreements, network provided neighboring list

21-04-00xx-00-0021-Layer2.5functionality

example preference rules translated into decision matrix

Air-interface

3GHigh

3GMedium

3GLow

3GUnavailable

802.11High

802.11

802.11

802.11

802.11

802.11Med

802.11

802.11

802.11

802.11

802.11Low

3G

802.11

802.11

802.11

802.11NA

3G

3G

3G

Work offline or sleep

Example: Preference Rules Translated into Decision Matrix

802.11medium_threshold is preferred over 3Ghigh_threshold

802.11low_threshold is preferred over 3Gmedium_threshold

21-04-00xx-00-0021-Layer2.5functionality

example preference rules translated into decision matrix8

Interface

802.3

802.3

802.3

802.3NA

802.11High

802.3

802.3

802.3

802.11

802.11Med

802.3

802.3

802.3

802.11

802.11Low

802.3

802.3

802.3

802.11

802.11NA

802.3

802.3

802.3

Work offline or sleep

Example: Preference Rules Translated into Decision Matrix

802.3is preferred over 802.11any_threshold

21-04-00xx-00-0021-Layer2.5functionality

recommendation
Recommendation
  • Don’t attempt to fix layer 3 deficiencies
  • Develop layer 2+ entity that assists layer 3 mobility
  • Don’t waste time defining the selection algorithm
  • Make layer 3 execute the handover decision
  • Define the interface to L3. Bidirectional SAP or Ethertype_21?
    • 3G can’t talk the Ethertype language
    • MIB is too slow

21-04-00xx-00-0021-Layer2.5functionality