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An investigation of heuristic decomposition to tackle workforce scheduling and routing with time-dependent activities constraints

Laesanklang, Wasakorn; Landa-Silva, Dario; Castillo-Salazar, J. Arturo


Wasakorn Laesanklang

J. Arturo Castillo-Salazar


Begoña Vitoriano

Greg Parlier


This paper presents an investigation into the application of heuristic decomposition and mixed-integer programming to tackle workforce scheduling and routing problems (WSRP) that involve time dependent activities constraints. These constraints refer to time-wise dependencies between activities. The decomposition method investigated here is called repeated decomposition with conflict repair (RDCR) and it consists of repeatedly applying a phase of problem decomposition and sub-problem solving, followed by a phase dedicated to conflict repair. In order to deal with the time-dependent activities constraints, the problem decomposition puts all activities associated to the same location and their dependent activities in the same sub-problem. This is to guarantee the satisfaction of time-dependent activities constraints as each sub-problem is solved exactly with an exact solver. Once the assignments are made, the time windows of dependent activities are fixed even if those activities are subject to the repair phase. The paper presents an experimental study to assess the performance of the decomposition method when compared to a tailored greedy heuristic. Results show that the proposed RDCR is an effective approach to harness the power of mixed integer programming solvers to tackle the difficult and highly constrained WSRP in practical computational time. Also, an analysis is conducted in order to understand how the performance of the different solution methods (the decomposition, the tailored heuristic and the MIP solver) is affected by the size of the problem instances and other features of the problem. The paper concludes by making some recommendations on the type of method that could be more suitable for different problem sizes.

Book Type Book Chapter
Peer Reviewed Peer Reviewed
Series Title Communications in computer and information science
Book Title Operations research and enterprise systems
Institution Citation Laesanklang, W., Landa-Silva, D., & Castillo-Salazar, J. A. (in press). An investigation of heuristic decomposition to tackle workforce scheduling and routing with time-dependent activities constraints. In B. Vitoriano, & G. Parlier (Eds.), Operations research and enterprise systemsSpringer
Keywords Workforce scheduling and routing problem, Time-dependent activities constraints, Mixed integer programming, Problem decomposition
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
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