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Handover mechanisms in next generation heterogeneous wireless ...

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

7.6 Conclusion<br />

In this chapter, a generic multi-<strong>in</strong>terface mobile term<strong>in</strong>al model is <strong>in</strong>troduced. The<br />

proposed model can work with IEEE 802.21 for media <strong>in</strong>dependent handover, and<br />

supports the accommodation of multiple network <strong>in</strong>terfaces on a mobile term<strong>in</strong>al. The<br />

simulation on ns-2 proves that it can support ord<strong>in</strong>ary upper layer protocols such as<br />

TCP, UDP and Mobile IPv4. By implement<strong>in</strong>g a cross-layer trigger mechanism, it<br />

greatly reduces handover delay, and makes handover delay <strong>in</strong>dependent of<br />

heterogeneities of access networks. It was shown that a smooth transmission of non real<br />

time traffic be<strong>in</strong>g carried on TCP can be expected <strong>in</strong> a handover when the cross-layer<br />

trigger mechanism is applied and visited networks have small advertisement <strong>in</strong>terval<br />

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