Title :
Efficient Virtual Backbone Construction with Routing Cost Constraint in Wireless Networks Using Directional Antennas
Author :
Ding, Ling ; Wu, Weili ; Willson, James ; Du, Hongjie ; Lee, Wonjun
Author_Institution :
Dept. of Comput. Sci., Univ. of Texas, Richardson, TX, USA
fDate :
7/1/2012 12:00:00 AM
Abstract :
Directional antennas can divide the transmission range into several sectors. Thus, through switching off sectors in unnecessary directions in wireless networks, we can save bandwidth and energy consumption. In this paper, we will study a directional virtual backbone (VB) in the network where directional antennas are used. When constructing a VB, we will take routing and broadcasting into account since they are two common operations in wireless networks. Hence, we will study a VB with guaranteed routing costs, named α Minimum rOuting Cost Directional VB (α-MOC-DVB). Besides the properties of regular VBs, α-MOC-DVB also has a special constraint - for any pair of nodes, there exists at least one path all intermediate directions on which must belong to α-MOC-DVB and the number of intermediate directions on the path is smaller than α times that on the shortest path. We prove that construction of a minimum α-MOC-DVB is an NP-hard problem in a general directed graph. A heuristic algorithm is proposed and theoretical analysis is also discussed in the paper. Extensive simulations demonstrate that our α-MOC-DVB is much more efficient in the sense of VB size and routing costs compared to other VBs.
Keywords :
directive antennas; energy consumption; radio networks; telecommunication network routing; α-MOC-DVB; directional antennas; directional virtual backbone; energy consumption; minimum routing cost directional; routing cost constraint; routing costs; virtual backbone construction; wireless networks; Approximation algorithms; Digital video broadcasting; Directional antennas; Routing; Switches; Wireless networks; Directional antennas; NP-hard; connected dominating set; general graph; obstacle; routing costs; virtual backbone.; wireless network;
Journal_Title :
Mobile Computing, IEEE Transactions on
DOI :
10.1109/TMC.2011.129