ROUTING TECHNIQUES IN WIRELESS SENSOR NETWORKS: A SURVEY
Outline
Challenges in WSNs
Network Structure Categorization
Flat-Based Routing Protocols
Network Structure Categorization
Hierarchical Routing
Location-Based Routing
Routing Protocols based on Protocol Operation
Summary

Hierarchical Routing
1. Low Energy Adaptive Clustering Hierarchy(LEACH):
Random and variation Cluster Head (CH) selection
Compression and transmission of arriving data at CHs
Constant monitoring applications
Good for small networks
Extra overhead because of clustering

2. Self Organizing Protocol (SOP):
Mobile sensors to probe the environment
Stationary nodes as the routers
LML algorithm for routing
Energy consumption is less than SPIN