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The authors aim to revise the handoff method for NEMO and integrated 3G and NEMO network. These methods include horizontal handoff in NEMO and vertical handoff in integrated 3G and NEMO network. This paper took advantage of the NEMO's characteristics to propose a novel horizontal handoff method. Besides, they adopt the conception of hierarchical network and propose HO to assist the vertical handoff. Their method decreases handoff latency, control packets and network latency for handoff. The simulation shows that the handoff latency be decreased by about 3000ms for horizontal handoff. The average result shows that their method decreases control packet by about 47.3% and network latency by about 38.7% for vertical handoff.
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