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Sensors 2018, 18(4), 1216;

Adaptive Aggregation Routing to Reduce Delay for Multi-Layer Wireless Sensor Networks

School of Information Science and Engineering, Central South University, Changsha 410083, China
The State Key Laboratory of Industrial Control Technology, Zhejiang University, Hangzhou 310027, China
School of Computer Science and Information Engineering, Zhejiang Gongshang University, Hangzhou 310018, China
Department of Mathematics and Computer Science, Northeastern State University, Tahlequah, OK 74464, USA
Department of Network Engineering, School of Computer, National University of Defense Technology, Changsha 410073, China
Author to whom correspondence should be addressed.
Received: 30 March 2018 / Revised: 12 April 2018 / Accepted: 12 April 2018 / Published: 16 April 2018
(This article belongs to the Special Issue QoS in Wireless Sensor Networks)
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The quality of service (QoS) regarding delay, lifetime and reliability is the key to the application of wireless sensor networks (WSNs). Data aggregation is a method to effectively reduce the data transmission volume and improve the lifetime of a network. In the previous study, a common strategy required that data wait in the queue. When the length of the queue is greater than or equal to the predetermined aggregation threshold ( N t ) or the waiting time is equal to the aggregation timer ( T t ), data are forwarded at the expense of an increase in the delay. The primary contributions of the proposed Adaptive Aggregation Routing (AAR) scheme are the following: (a) the senders select the forwarding node dynamically according to the length of the data queue, which effectively reduces the delay. In the AAR scheme, the senders send data to the nodes with a long data queue. The advantages are that first, the nodes with a long data queue need a small amount of data to perform aggregation; therefore, the transmitted data can be fully utilized to make these nodes aggregate. Second, this scheme balances the aggregating and data sending load; thus, the lifetime increases. (b) An improved AAR scheme is proposed to improve the QoS. The aggregation deadline ( T t ) and the aggregation threshold ( N t ) are dynamically changed in the network. In WSNs, nodes far from the sink have residual energy because these nodes transmit less data than the other nodes. In the improved AAR scheme, the nodes far from the sink have a small value of T t and N t to reduce delay, and the nodes near the sink are set to a large value of T t and N t to reduce energy consumption. Thus, the end to end delay is reduced, a longer lifetime is achieved, and the residual energy is fully used. Simulation results demonstrate that compared with the previous scheme, the performance of the AAR scheme is improved. This scheme reduces the delay by 14.91%, improves the lifetime by 30.91%, and increases energy efficiency by 76.40%. View Full-Text
Keywords: wireless sensor networks; data aggregation; aggregation delay; aggregation ratio; energy efficiency wireless sensor networks; data aggregation; aggregation delay; aggregation ratio; energy efficiency

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Li, X.; Liu, A.; Xie, M.; Xiong, N.N.; Zeng, Z.; Cai, Z. Adaptive Aggregation Routing to Reduce Delay for Multi-Layer Wireless Sensor Networks. Sensors 2018, 18, 1216.

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