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21-04-00xx-00-0021-Layer2.5functionality Layer 2.5 Functionality Peretz Feder Ajay Rajkumar Lucent Technologies May 13, 2004.

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Presentation on theme: "21-04-00xx-00-0021-Layer2.5functionality Layer 2.5 Functionality Peretz Feder Ajay Rajkumar Lucent Technologies May 13, 2004."— Presentation transcript:

1 xx Layer2.5functionality Layer 2.5 Functionality Peretz Feder Ajay Rajkumar Lucent Technologies May 13, 2004

2 xx Layer2.5functionality Objectives 1.To crystallize the concept and boundary of layer To describe the scope of the triggers with relation to Layers 3 and Define interfaces to mobility management at layer 3 4.Identify the decision entity and its relation to the executive entity

3 xx Layer2.5functionality 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 ? Lets explore layer 3-

4 xx Layer2.5functionality Layer 2.5 Boundary Definition Mobile NodeNetwork

5 xx Layer2.5functionality 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

6 xx Layer2.5functionality 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

7 xx Layer2.5functionality Example: Preference Rules Translated into Decision Matrix Air- interface 3G High 3G Medium 3G Low 3G Unavailable High Med Low 3G NA 3G Work offline or sleep medium_threshold is preferred over 3G high_threshold low_threshold is preferred over 3G medium_threshold

8 xx Layer2.5functionality Example: Preference Rules Translated into Decision Matrix Interface NA High Med Low NA Work offline or sleep is preferred over any_threshold

9 xx Layer2.5functionality Recommendation Dont attempt to fix layer 3 deficiencies Develop layer 2+ entity that assists layer 3 mobility Dont waste time defining the selection algorithm Make layer 3 execute the handover decision Define the interface to L3. Bidirectional SAP or Ethertype_21? –3G cant talk the Ethertype language –MIB is too slow


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