Journal of Applied Sciences ›› 2012, Vol. 30 ›› Issue (5): 473-478.doi: 10.3969/j.issn.0255-8297.2012.05.006

• Communication Engineering • Previous Articles     Next Articles

Flow Control of Optimum Second Order Approximation Modulus with Improved Differentiation Element in Sensor Networks

NI Xiao, SHI Wei-ren, HUANG Qin   

  1. College of Automation, Chongqing University, Chongqing 400030, China
  • Received:2011-09-06 Revised:2011-09-29 Online:2012-09-24 Published:2012-09-25

Abstract:

Because self-organized wireless sensor network is randomly setup, data transmission among the nodes is subject to traffic jam. To address this problem, this paper proposes a method of optimum second order approximation modulus with an improved differentiation element to control data transmission. The controller applies a function of the optimum second order approximation modulus as its transfer function. It negatively
feedbacks the data buffer length in a node to its input point, and controls the speed of data transmission of the up-stream node. A differential element is added to the transfer function to reduce over-modulation and speed the peak emergence. Thus no traffic overflow will occur both in transition and in permanent periods.

Key words: sensor network, flow control, optimum second order approximation modulus

CLC Number: