Optimal Rate Allocation in Cluster-Tree WSNs

Sensors

Antoni Morell³  Jose Lopez Vicario³  Xavier Vilajosana²  Ignasi Vilajosana¹ 

[1] World Sensing S.L., Baixada Gomis, 1, 08023 Barcelona, Spain; E-Mail:;IT, Multimedia and Telecommunications Department, Universitat Oberta de Catalunya, Rambla Poblenou, 156, 08018 Barcelona, Spain; E-Mail:;Telecommunications and Systems Engineering Department, Universitat Autònoma de Barcelona, UAB Campus, 08193 Cerdanyola del Vallès, Spain; E-Mails:

关键词: wireless sensor networks;    contention free access;    fair time slot allocation;    distributed optimization;    reduced signalling;   

DOI  :  10.3390/s110403611

来源: mdpi

【 摘 要 】

In this paper, we propose a solution to the problem of guaranteed time slot allocation in cluster-tree WSNs. Our design uses the so-called Network Utility Maximization (NUM) approach as far as we aim to provide a fair distribution of the available resources. From the point of view of implementation, we extend here the authors’ proposed Coupled-Decompositions Method (CDM) in order to compute the NUM problem inside the cluster tree topology and we prove the optimality of this new extended version of the method. As a result, we obtain a distributed solution that reduces the total amount of signalling information in the network up to a factor of 500 with respect to the classical techniques, that is, primal and dual decomposition. This is possible because the CDM finds the optimal solution with a small number of iterations. Furthermore, when we compare our solution to the standard-proposed First Come First Serve (FCFS) policy, we realize that FCFS becomes pretty unfair as the traffic load in the network increases and thus, a fair allocation of resources can be considered whenever the price to pay in terms of signalling and computational complexity is controlled.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.