Low-Energy Adaptive Clustering Hierarchy 指導老師 : 潘仁義 698430071 唐健恒.

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Presentation transcript:

Low-Energy Adaptive Clustering Hierarchy 指導老師 : 潘仁義唐健恒

Outline Radio Model Energy Analysis LEACH LEACH Algorithm

Radio Model

Energy Analysis

LEACH In LEACH, the nodes organize themselves into local clusters, with one node acting as the local base station or cluster-head. These cluster-head nodes broadcast their status to the other sensors in the network. Each sensor node determines to which cluster it wants to belong by choosing the cluster-head that requires the minimum communication energy. the cluster-head nodes are not ﬁxed. The decision to become a cluster-head depends on the amount of energy left at the node.

LEACH Algorithm Advertisement Phase Cluster Phase Schedule Creation Data Transmission Hierarchical Clustering

Advertisement Phase For this “cluster-head-advertisement” phase, the cluster-heads use a CSMA MAC protocol, and all cluster-heads transmit their advertisement using the same transmit energy. decideClusterHead {} in ns-leach.tcl

Cluster Phase After each node has decided to which cluster it belongs,it must inform the cluster-head node that it will be a member of the cluster. findBestCluster{} and informClusterHead{} Each node transmits this information back to the cluster-head again using a CSMA MAC protocol. During this phase, all cluster-head nodes must keep their receivers on.

Schedule Creation The cluster-head node receives all the messages for nodes that would like to be included in the cluster. Based on the number of nodes in the cluster, the cluster-head node creates a TDMA schedule telling each node when it can transmit. createSchedule{}

Data Transmission Non-cluster-head send data during their allocated transmission time to the cluster-head. The radio of each non-cluster-head node can be turned off until the node's allocated transmission time, thus minimizing energy dissipation in these nodes. When all the data has been received, the cluster head node performs signal processing functions to compress the data into a single signal. This composite signal is sent to the base station.

Hierarchical Clustering the cluster-head nodes would communicate with “super-cluster-head” nodes and so on until the top layer of the hierarchy, at which point the data would be sent to the base station.

抽考請在 ns 版本上灌 LEACH 會有提供安裝的步驟，考試可帶參考資料