The Hierarchical Mobile IP have been introduced as the way of constructing efficient wireless networks. But, in case the HMIPv6 is applied to the actual networks, it has problems that the load unbalance and overload to the MAP might be brought out because of the difference between the theoretical structure and the structure of actual network. In this paper, the scheme adopting the virtual MAP to the HMIPv6 is proposed. This solves the problems mentioned above and reduces handover delay time. The virtual MAP is the one of the routers located between the MN and actual MAP. In order to approve the scheme, the handoff latency of the standard HMIPv6 and the proposed HMIPv6 with virtual MAP are analyzed, respectively. The analytical results show that the proposed scheme improves the handoff latency. Experiments are performed to evaluate the handoff latency in terms of the amount of transmission packets under various conditions. The simulation results show that the proposed scheme is more effective than the standard HMIPv6 scheme.
-ZigBee network, based on PHY, MAC layer provides a specification for a suite of high level communication protocols using small, low-power digital radio based on an IEEE 802.15.4 standard. Meshing is a type of daisy chaining from one device to another. This technique allows the short range of an individual node to be expanded and multiplied, covering a much larger area. Each wireless technology that makes it to market serves a special purpose or function. Zigbee provides short-range connectivity in what is called a personal-area network (PAN). Within ZigBee PAN coordinator as manages an entire ZigBee network, the short range of frequency band was only selected because the technology allows typically less than 100 kbp or ZigBee troubles in retransmission processing and delaying data tranmission works to create unproductive condition of work. This research was proposed the method, based on short range frequency of zigBee nodes enable to long range of remote data transmission with specific algorithm tools.
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