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Handover mechanisms in next generation heterogeneous wireless ...

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MULTI-INTERFACE MOBILE MODEL FOR MEDIA INDEPENDENT HANDOVER<br />

7.5.2 Impact of Access Heterogeneities on <strong>Handover</strong><br />

The access heterogeneities are def<strong>in</strong>ed as the differences <strong>in</strong> access technologies that are<br />

employed by <strong>heterogeneous</strong> <strong>wireless</strong> networks for provid<strong>in</strong>g network services. The<br />

scenario of Figure 7.10 is used to evaluate the impact of access heterogeneities on<br />

handover. The dual-<strong>in</strong>terface MH moves anti-clockwise along the triangle formed by<br />

the FA1, FA2 and HA. Data traffic is carried between the CN and the MH. The radio<br />

coverage areas of three nodes are illustrated <strong>in</strong> Figure 7.10. Accord<strong>in</strong>g to the def<strong>in</strong>ed<br />

trajectory, the MH is expected to hand over <strong>in</strong> both the radio overlap (of the FA1 and<br />

FA2) and non-overlap areas. Different Advertisement Intervals (ADI) and<br />

Advertisement Lifetime (ADF) are configured on the FA1 AR and FA2 AR. The MH<br />

starts at 5 sec from the FA1, and arrives at the FA2 at 30 sec. Then, it moves towards<br />

the HA, and reaches the HA at 70 sec. The MH f<strong>in</strong>ally returns to the FA1 at 110 sec, by<br />

which the simulation stops.<br />

300m<br />

Figure 7.10 Mobility Scenario 2<br />

The agent routers of different network doma<strong>in</strong>s may come up with different sett<strong>in</strong>gs for<br />

mobility management, <strong>in</strong> particular on ADI and ADF. In the scenario of Figure 7.10, the<br />

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