Scheduling Bidirectional Traffic on a Path
Abstract
We study the fundamental problem of scheduling bidirectional traffic along a path composed of multiple segments. The main feature of the problem is that jobs traveling in the same direction can be scheduled in quick succession on a segment, while jobs in opposing directions cannot cross a segment at the same time. We show that this tradeoff makes the problem significantly harder than the related flow shop problem, by proving that it is NP-hard even for identical jobs. We complement this result with a PTAS for a single segment and non-identical jobs. If we allow some pairs of jobs traveling in different directions to cross a segment concurrently, the problem becomes APX-hard even on a single segment and with identical jobs. We give polynomial algorithms for the setting with restricted compatibilities between jobs on a single and any constant number of segments, respectively.
Keywords
Cite
@article{arxiv.1504.07129,
title = {Scheduling Bidirectional Traffic on a Path},
author = {Yann Disser and Max Klimm and Elisabeth Lübbecke},
journal= {arXiv preprint arXiv:1504.07129},
year = {2015}
}