Optimization of Rider Scheduling for a Food Delivery Service in O2O Business

Table 2

Sets, parameters, and decision variables.

Notation	Description
Sets
	Set of assigned riders in subregion
	Set of orders in subregion, for any order , it consists of two nodes, denoted by .
	Set of customers
	Set of sub-regions serviced by riders,
	Set of all nodes including pickup nodes (restaurant’s locations) and delivery nodes (customer’s locations) and the depot (the starting node of the rider)
Parameters
,	The order placed time by customer and the expected delivery time by customer i, respectively
	The load quantity of rider arriving at node
	Departure time of rider at node
	The demand at node
	The capacity of the vehicle owned by the rider
	Each arc is associated with a travel time
	Distance of the arc , unit: meter
	Fixed costs for each rider, unit: CNY
	The traveling cost, unit: CNY
Decision variables
	Binary decision variable equals 1 if the rider travels from node to node ; 0 otherwise.
	Binary decision variable equals 1 if rider is assigned to deliver food delivery by the service platforms in the period in the subregion
	Binary decision variable equal 1 if the rider services node