Research On Transaction Prcessing Technology For Wireless Sensor Networks

WSN (Wireless Sensor Networks), a new type of distributed network architecture, carries thecharacteristics of self-organization, mobility, disconnection and energy limitation. It is mainly basedon data acquisition applications and can be integrated with existing applications as data sources.How to ensure the effectiveness and consistency of the WSN data, has become a research hotspot inthe field of WSN data management.Transactions which are the collection of a series of operations, provide reliable quality serviceand ensure data consistency. Uncertainty of conflict and loss of information exist in WSN; andabnormal node or communication failure will lead to a distributed transaction-based 2PC (TwoPhase Commit) protocol blocking, 2PC protocol no longer being suitable for WSN, it is necessaryto improve and simplify 2PC commit protocol to adapt to the WSN with message loss frequencyand energy limitation.This paper puts forward concepts of update and query transactions and improves the traditional2PC transaction protocol. The base station, as a coordinator, initiates transactions and broadcaststransaction context to all participating nodes, which proceed to use the timers to commit thetransactions and send Acknowledge or Conflict message back to the base station according to thetime slot. Concurrency control strategy using forward validation scheme of optimistic concurrencycontrol, conflict detection in the base station side and sensor side, suspended transactions due toconflict are aroused by trigger mechanism. The scheme ensures data consistency and availability ofWSN application, and accommodates the features of WSN. Finally experiments are simulated byusing TOSSIM and its feasibility is proved.