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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

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On Channel-Discontinuity-Constraint Routing in Wireless Networks.

Swaminathan Sankararaman¹, Alon Efrat¹, Srinivasan Ramasubramanian²

¹Department of Computer Science, The University of Arizona, Tucson, AZ, USA.

Ad Hoc Networks

|January 21, 2014

Summary

This summary is machine-generated.

This study introduces Channel-Discontinuity-Constraint (CDC) paths for multi-channel wireless networks, enhancing performance in TDMA systems. It presents efficient algorithms for spanners and minimum-cost path computations, improving network efficiency.

Keywords:

algorithms directional antennas routing spanners

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Area of Science:

Computer Science
Wireless Networking
Distributed Systems

Background:

Multi-channel wireless networks with directional antennas are common in urban areas.
Efficient path computation with channel assignments is crucial for maximizing throughput.
Channel-Discontinuity-Constraint (CDC) paths ensure consecutive links use different channels, beneficial for TDMA systems.

Purpose of the Study:

To develop a t-spanner for CDC-paths to approximate path costs efficiently.
To design a distributed algorithm for finding minimum-cost CDC-paths.
To improve the time complexity of centralized CDC-path computations.

Main Methods:

Developed a t-spanner using spatial properties with O(n/θ) links.
Proposed a distributed algorithm for spanner computation using O(n log n) messages.
Extended Edmonds' algorithm for minimum-cost perfect matching to find minimum-cost CDC-paths in O(n^2) messages.

Main Results:

The t-spanner increases CDC-path costs by at most a factor t = (1-2 sin (θ/2))⁻².
The distributed algorithm for spanner computation uses an expected O(n log n) fixed-size messages.
The distributed algorithm for minimum-cost CDC-paths uses O(n^2) fixed-size messages.
Centralized implementation achieves O(n^2) time complexity, an improvement over O(n^3).
Combined with the spanner, centralized computation time improves to O(n/θ).

Conclusions:

The developed t-spanner provides an efficient approximation for CDC-paths.
Novel distributed algorithms significantly reduce message complexity for spanner and path computations.
The proposed methods offer substantial improvements in both distributed and centralized CDC-path finding.