後卓越進度報告 蔡育仁老師實驗室 2007/08/13

DSC with Slotted ALOHA in Clustered WSN We analyze further the clustered WSNs applying  Compression: DSC (sequential encoding/decoding)  MAC: Slotted ALOHA Decoding policy  Inter-cluster: independent decoding  Intra-cluster: sequential decoding Sink

Effect of Cluster Number: Average Delay (100 Sensors) Success Rate Average Delay CL=1 CL=5 CL=10 DSC No DSC

Effect of Cluster Number: Energy Consumption (100 Sensors) Success Rate Energy Consumption (Unit Energy / Bit) CL=1 CL=5 CL=10 DSC No DSC

DSC with Adaptive Slotted ALOHA in Clustered WSN Adaptive slotted ALOHA  Shortens average decoding delay  Provides a nearly constant total traffic load  Sensors distributedly adjust transmission probabilities per slot Adaptation scheme in clustered WSN  Obtain the total traffic load per slot in a clustered WSN with fixed transmission probabilities  In a cluster, sensors adjusting transmission probabilities according to total traffic load and cluster size

Success Rate Average Delay Equal Linear 2-step Adp_Equal Adp_Linear Adp_2-step DSC with Adaptive Slotted ALOHA: Average Delay (100 Sensors)