tailieunhanh - Wireless Mesh Networks part 10

Tham khảo tài liệu 'wireless mesh networks part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 214 Wireless Mesh Networks concept but it contains some distinguishing features conceived to increase its robustness and accuracy in the large-scale mesh networking environment for which it is designed. Main ideas VIMLOC is a proactive location database scheme. Conceived as a some-for-some approach it is designed by taking into account the specific characteristics of the WMN architecture namely the WMN backbone. In particular and as opposed to the VHR scheme not all nodes are considered as location servers. Since the mesh backbone consists of wireless mesh routers WMRs that are more stable in terms of movement and power constraints than mobile nodes MNs just these WMRs are considered as some nodes storing location information in a distributed way. MNs do not act as location servers and just cache location information related to their flows. Furthermore location databases do not contain the locations of all nodes in the network but just of some selected ones in the network with their node_ID-to-location mapping. This globally saves location information state thus improving scalability. VIMLOC is mainly conceived to increase robustness and accuracy. These are critical requirements for the successful delivery of packets in a position-based routing environment. Additionally mechanisms to control the overhead generated by VIMLOC are also considered. In particular the distinguishing features of the VIMLOC scheme follow Multiple hash functions to increase robustness . one node has more than one virtual home region called HomeGeoCluster HGC . This also allows load balancing of location servers Visited geographic region called VisitedGeoCluster VGC around a given node in addition to its HGCs for accuracy. It supports fine-grained mobility by diverting packets to the appropriate location as they approach the destination . arriving packets will follow the trail of the node Lazy location updates of HGCs to reduce update overhead throughout the network towards .

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